xref: /freebsd/contrib/bmake/job.c (revision 5b0945b57059d1cde0831d3afea7ec56c7d79508)
1 /*	$NetBSD: job.c,v 1.201 2020/07/03 08:13:23 rillig Exp $	*/
2 
3 /*
4  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to Berkeley by
8  * Adam de Boor.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 /*
36  * Copyright (c) 1988, 1989 by Adam de Boor
37  * Copyright (c) 1989 by Berkeley Softworks
38  * All rights reserved.
39  *
40  * This code is derived from software contributed to Berkeley by
41  * Adam de Boor.
42  *
43  * Redistribution and use in source and binary forms, with or without
44  * modification, are permitted provided that the following conditions
45  * are met:
46  * 1. Redistributions of source code must retain the above copyright
47  *    notice, this list of conditions and the following disclaimer.
48  * 2. Redistributions in binary form must reproduce the above copyright
49  *    notice, this list of conditions and the following disclaimer in the
50  *    documentation and/or other materials provided with the distribution.
51  * 3. All advertising materials mentioning features or use of this software
52  *    must display the following acknowledgement:
53  *	This product includes software developed by the University of
54  *	California, Berkeley and its contributors.
55  * 4. Neither the name of the University nor the names of its contributors
56  *    may be used to endorse or promote products derived from this software
57  *    without specific prior written permission.
58  *
59  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
60  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
61  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
62  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
63  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
64  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
65  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
66  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
67  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
68  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
69  * SUCH DAMAGE.
70  */
71 
72 #ifndef MAKE_NATIVE
73 static char rcsid[] = "$NetBSD: job.c,v 1.201 2020/07/03 08:13:23 rillig Exp $";
74 #else
75 #include <sys/cdefs.h>
76 #ifndef lint
77 #if 0
78 static char sccsid[] = "@(#)job.c	8.2 (Berkeley) 3/19/94";
79 #else
80 __RCSID("$NetBSD: job.c,v 1.201 2020/07/03 08:13:23 rillig Exp $");
81 #endif
82 #endif /* not lint */
83 #endif
84 
85 /*-
86  * job.c --
87  *	handle the creation etc. of our child processes.
88  *
89  * Interface:
90  *	Job_Make  	    	Start the creation of the given target.
91  *
92  *	Job_CatchChildren   	Check for and handle the termination of any
93  *	    	  	    	children. This must be called reasonably
94  *	    	  	    	frequently to keep the whole make going at
95  *	    	  	    	a decent clip, since job table entries aren't
96  *	    	  	    	removed until their process is caught this way.
97  *
98  *	Job_CatchOutput	    	Print any output our children have produced.
99  *	    	  	    	Should also be called fairly frequently to
100  *	    	  	    	keep the user informed of what's going on.
101  *	    	  	    	If no output is waiting, it will block for
102  *	    	  	    	a time given by the SEL_* constants, below,
103  *	    	  	    	or until output is ready.
104  *
105  *	Job_Init  	    	Called to initialize this module. in addition,
106  *	    	  	    	any commands attached to the .BEGIN target
107  *	    	  	    	are executed before this function returns.
108  *	    	  	    	Hence, the makefile must have been parsed
109  *	    	  	    	before this function is called.
110  *
111  *	Job_End  	    	Cleanup any memory used.
112  *
113  *	Job_ParseShell	    	Given the line following a .SHELL target, parse
114  *	    	  	    	the line as a shell specification. Returns
115  *	    	  	    	FAILURE if the spec was incorrect.
116  *
117  *	Job_Finish	    	Perform any final processing which needs doing.
118  *	    	  	    	This includes the execution of any commands
119  *	    	  	    	which have been/were attached to the .END
120  *	    	  	    	target. It should only be called when the
121  *	    	  	    	job table is empty.
122  *
123  *	Job_AbortAll	    	Abort all currently running jobs. It doesn't
124  *	    	  	    	handle output or do anything for the jobs,
125  *	    	  	    	just kills them. It should only be called in
126  *	    	  	    	an emergency, as it were.
127  *
128  *	Job_CheckCommands   	Verify that the commands for a target are
129  *	    	  	    	ok. Provide them if necessary and possible.
130  *
131  *	Job_Touch 	    	Update a target without really updating it.
132  *
133  *	Job_Wait  	    	Wait for all currently-running jobs to finish.
134  */
135 
136 #ifdef HAVE_CONFIG_H
137 # include "config.h"
138 #endif
139 #include <sys/types.h>
140 #include <sys/stat.h>
141 #include <sys/file.h>
142 #include <sys/time.h>
143 #include "wait.h"
144 
145 #include <assert.h>
146 #include <errno.h>
147 #if !defined(USE_SELECT) && defined(HAVE_POLL_H)
148 #include <poll.h>
149 #else
150 #ifndef USE_SELECT			/* no poll.h */
151 # define USE_SELECT
152 #endif
153 #if defined(HAVE_SYS_SELECT_H)
154 # include <sys/select.h>
155 #endif
156 #endif
157 #include <signal.h>
158 #include <stdio.h>
159 #include <string.h>
160 #include <utime.h>
161 #if defined(HAVE_SYS_SOCKET_H)
162 # include <sys/socket.h>
163 #endif
164 
165 #include "make.h"
166 #include "hash.h"
167 #include "dir.h"
168 #include "job.h"
169 #include "pathnames.h"
170 #include "trace.h"
171 # define STATIC static
172 
173 /*
174  * FreeBSD: traditionally .MAKE is not required to
175  * pass jobs queue to sub-makes.
176  * Use .MAKE.ALWAYS_PASS_JOB_QUEUE=no to disable.
177  */
178 #define MAKE_ALWAYS_PASS_JOB_QUEUE ".MAKE.ALWAYS_PASS_JOB_QUEUE"
179 static int Always_pass_job_queue = TRUE;
180 /*
181  * FreeBSD: aborting entire parallel make isn't always
182  * desired. When doing tinderbox for example, failure of
183  * one architecture should not stop all.
184  * We still want to bail on interrupt though.
185  */
186 #define MAKE_JOB_ERROR_TOKEN "MAKE_JOB_ERROR_TOKEN"
187 static int Job_error_token = TRUE;
188 
189 /*
190  * error handling variables
191  */
192 static int     	errors = 0;	    /* number of errors reported */
193 static int    	aborting = 0;	    /* why is the make aborting? */
194 #define ABORT_ERROR	1   	    /* Because of an error */
195 #define ABORT_INTERRUPT	2   	    /* Because it was interrupted */
196 #define ABORT_WAIT	3   	    /* Waiting for jobs to finish */
197 #define JOB_TOKENS	"+EI+"	    /* Token to requeue for each abort state */
198 
199 /*
200  * this tracks the number of tokens currently "out" to build jobs.
201  */
202 int jobTokensRunning = 0;
203 int not_parallel = 0;		    /* set if .NOT_PARALLEL */
204 
205 /*
206  * XXX: Avoid SunOS bug... FILENO() is fp->_file, and file
207  * is a char! So when we go above 127 we turn negative!
208  */
209 #define FILENO(a) ((unsigned) fileno(a))
210 
211 /*
212  * post-make command processing. The node postCommands is really just the
213  * .END target but we keep it around to avoid having to search for it
214  * all the time.
215  */
216 static GNode   	  *postCommands = NULL;
217 				    /* node containing commands to execute when
218 				     * everything else is done */
219 static int     	  numCommands; 	    /* The number of commands actually printed
220 				     * for a target. Should this number be
221 				     * 0, no shell will be executed. */
222 
223 /*
224  * Return values from JobStart.
225  */
226 #define JOB_RUNNING	0   	/* Job is running */
227 #define JOB_ERROR 	1   	/* Error in starting the job */
228 #define JOB_FINISHED	2   	/* The job is already finished */
229 
230 /*
231  * Descriptions for various shells.
232  *
233  * The build environment may set DEFSHELL_INDEX to one of
234  * DEFSHELL_INDEX_SH, DEFSHELL_INDEX_KSH, or DEFSHELL_INDEX_CSH, to
235  * select one of the prefedined shells as the default shell.
236  *
237  * Alternatively, the build environment may set DEFSHELL_CUSTOM to the
238  * name or the full path of a sh-compatible shell, which will be used as
239  * the default shell.
240  *
241  * ".SHELL" lines in Makefiles can choose the default shell from the
242  # set defined here, or add additional shells.
243  */
244 
245 #ifdef DEFSHELL_CUSTOM
246 #define DEFSHELL_INDEX_CUSTOM 0
247 #define DEFSHELL_INDEX_SH     1
248 #define DEFSHELL_INDEX_KSH    2
249 #define DEFSHELL_INDEX_CSH    3
250 #else /* !DEFSHELL_CUSTOM */
251 #define DEFSHELL_INDEX_SH     0
252 #define DEFSHELL_INDEX_KSH    1
253 #define DEFSHELL_INDEX_CSH    2
254 #endif /* !DEFSHELL_CUSTOM */
255 
256 #ifndef DEFSHELL_INDEX
257 #define DEFSHELL_INDEX 0	/* DEFSHELL_INDEX_CUSTOM or DEFSHELL_INDEX_SH */
258 #endif /* !DEFSHELL_INDEX */
259 
260 static Shell    shells[] = {
261 #ifdef DEFSHELL_CUSTOM
262     /*
263      * An sh-compatible shell with a non-standard name.
264      *
265      * Keep this in sync with the "sh" description below, but avoid
266      * non-portable features that might not be supplied by all
267      * sh-compatible shells.
268      */
269 {
270     DEFSHELL_CUSTOM,
271     FALSE, "", "", "", 0,
272     FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#',
273     "",
274     "",
275 },
276 #endif /* DEFSHELL_CUSTOM */
277     /*
278      * SH description. Echo control is also possible and, under
279      * sun UNIX anyway, one can even control error checking.
280      */
281 {
282     "sh",
283     FALSE, "", "", "", 0,
284     FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#',
285 #if defined(MAKE_NATIVE) && defined(__NetBSD__)
286     "q",
287 #else
288     "",
289 #endif
290     "",
291 },
292     /*
293      * KSH description.
294      */
295 {
296     "ksh",
297     TRUE, "set +v", "set -v", "set +v", 6,
298     FALSE, "echo \"%s\"\n", "%s\n", "{ %s \n} || exit $?\n", "'\n'", '#',
299     "v",
300     "",
301 },
302     /*
303      * CSH description. The csh can do echo control by playing
304      * with the setting of the 'echo' shell variable. Sadly,
305      * however, it is unable to do error control nicely.
306      */
307 {
308     "csh",
309     TRUE, "unset verbose", "set verbose", "unset verbose", 10,
310     FALSE, "echo \"%s\"\n", "csh -c \"%s || exit 0\"\n", "", "'\\\n'", '#',
311     "v", "e",
312 },
313     /*
314      * UNKNOWN.
315      */
316 {
317     NULL,
318     FALSE, NULL, NULL, NULL, 0,
319     FALSE, NULL, NULL, NULL, NULL, 0,
320     NULL, NULL,
321 }
322 };
323 static Shell *commandShell = &shells[DEFSHELL_INDEX]; /* this is the shell to
324 						   * which we pass all
325 						   * commands in the Makefile.
326 						   * It is set by the
327 						   * Job_ParseShell function */
328 const char *shellPath = NULL,		  	  /* full pathname of
329 						   * executable image */
330            *shellName = NULL;		      	  /* last component of shell */
331 char *shellErrFlag = NULL;
332 static const char *shellArgv = NULL;		  /* Custom shell args */
333 
334 
335 STATIC Job	*job_table;	/* The structures that describe them */
336 STATIC Job	*job_table_end;	/* job_table + maxJobs */
337 static int	wantToken;	/* we want a token */
338 static int lurking_children = 0;
339 static int make_suspended = 0;	/* non-zero if we've seen a SIGTSTP (etc) */
340 
341 /*
342  * Set of descriptors of pipes connected to
343  * the output channels of children
344  */
345 static struct pollfd *fds = NULL;
346 static Job **jobfds = NULL;
347 static int nfds = 0;
348 static void watchfd(Job *);
349 static void clearfd(Job *);
350 static int readyfd(Job *);
351 
352 STATIC GNode   	*lastNode;	/* The node for which output was most recently
353 				 * produced. */
354 static char *targPrefix = NULL; /* What we print at the start of TARG_FMT */
355 static Job tokenWaitJob;	/* token wait pseudo-job */
356 
357 static Job childExitJob;	/* child exit pseudo-job */
358 #define	CHILD_EXIT	"."
359 #define	DO_JOB_RESUME	"R"
360 
361 static const int npseudojobs = 2; /* number of pseudo-jobs */
362 
363 #define TARG_FMT  "%s %s ---\n" /* Default format */
364 #define MESSAGE(fp, gn) \
365 	if (maxJobs != 1 && targPrefix && *targPrefix) \
366 	    (void)fprintf(fp, TARG_FMT, targPrefix, gn->name)
367 
368 static sigset_t caught_signals;	/* Set of signals we handle */
369 
370 static void JobChildSig(int);
371 static void JobContinueSig(int);
372 static Job *JobFindPid(int, int, Boolean);
373 static int JobPrintCommand(void *, void *);
374 static int JobSaveCommand(void *, void *);
375 static void JobClose(Job *);
376 static void JobExec(Job *, char **);
377 static void JobMakeArgv(Job *, char **);
378 static int JobStart(GNode *, int);
379 static char *JobOutput(Job *, char *, char *, int);
380 static void JobDoOutput(Job *, Boolean);
381 static Shell *JobMatchShell(const char *);
382 static void JobInterrupt(int, int) MAKE_ATTR_DEAD;
383 static void JobRestartJobs(void);
384 static void JobTokenAdd(void);
385 static void JobSigLock(sigset_t *);
386 static void JobSigUnlock(sigset_t *);
387 static void JobSigReset(void);
388 
389 #if !defined(MALLOC_OPTIONS)
390 # define MALLOC_OPTIONS "A"
391 #endif
392 const char *malloc_options= MALLOC_OPTIONS;
393 
394 static unsigned
395 nfds_per_job(void)
396 {
397 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
398     if (useMeta)
399 	return 2;
400 #endif
401     return 1;
402 }
403 
404 static void
405 job_table_dump(const char *where)
406 {
407     Job *job;
408 
409     fprintf(debug_file, "job table @ %s\n", where);
410     for (job = job_table; job < job_table_end; job++) {
411 	fprintf(debug_file, "job %d, status %d, flags %d, pid %d\n",
412 	    (int)(job - job_table), job->job_state, job->flags, job->pid);
413     }
414 }
415 
416 /*
417  * Delete the target of a failed, interrupted, or otherwise
418  * unsuccessful job unless inhibited by .PRECIOUS.
419  */
420 static void
421 JobDeleteTarget(GNode *gn)
422 {
423 	if ((gn->type & (OP_JOIN|OP_PHONY)) == 0 && !Targ_Precious(gn)) {
424 	    char *file = (gn->path == NULL ? gn->name : gn->path);
425 	    if (!noExecute && eunlink(file) != -1) {
426 		Error("*** %s removed", file);
427 	    }
428 	}
429 }
430 
431 /*
432  * JobSigLock/JobSigUnlock
433  *
434  * Signal lock routines to get exclusive access. Currently used to
435  * protect `jobs' and `stoppedJobs' list manipulations.
436  */
437 static void JobSigLock(sigset_t *omaskp)
438 {
439 	if (sigprocmask(SIG_BLOCK, &caught_signals, omaskp) != 0) {
440 		Punt("JobSigLock: sigprocmask: %s", strerror(errno));
441 		sigemptyset(omaskp);
442 	}
443 }
444 
445 static void JobSigUnlock(sigset_t *omaskp)
446 {
447 	(void)sigprocmask(SIG_SETMASK, omaskp, NULL);
448 }
449 
450 static void
451 JobCreatePipe(Job *job, int minfd)
452 {
453     int i, fd, flags;
454 
455     if (pipe(job->jobPipe) == -1)
456 	Punt("Cannot create pipe: %s", strerror(errno));
457 
458     for (i = 0; i < 2; i++) {
459        /* Avoid using low numbered fds */
460        fd = fcntl(job->jobPipe[i], F_DUPFD, minfd);
461        if (fd != -1) {
462 	   close(job->jobPipe[i]);
463 	   job->jobPipe[i] = fd;
464        }
465     }
466 
467     /* Set close-on-exec flag for both */
468     if (fcntl(job->jobPipe[0], F_SETFD, FD_CLOEXEC) == -1)
469 	Punt("Cannot set close-on-exec: %s", strerror(errno));
470     if (fcntl(job->jobPipe[1], F_SETFD, FD_CLOEXEC) == -1)
471 	Punt("Cannot set close-on-exec: %s", strerror(errno));
472 
473     /*
474      * We mark the input side of the pipe non-blocking; we poll(2) the
475      * pipe when we're waiting for a job token, but we might lose the
476      * race for the token when a new one becomes available, so the read
477      * from the pipe should not block.
478      */
479     flags = fcntl(job->jobPipe[0], F_GETFL, 0);
480     if (flags == -1)
481 	Punt("Cannot get flags: %s", strerror(errno));
482     flags |= O_NONBLOCK;
483     if (fcntl(job->jobPipe[0], F_SETFL, flags) == -1)
484 	Punt("Cannot set flags: %s", strerror(errno));
485 }
486 
487 /*-
488  *-----------------------------------------------------------------------
489  * JobCondPassSig --
490  *	Pass a signal to a job
491  *
492  * Input:
493  *	signop		Signal to send it
494  *
495  * Side Effects:
496  *	None, except the job may bite it.
497  *
498  *-----------------------------------------------------------------------
499  */
500 static void
501 JobCondPassSig(int signo)
502 {
503     Job *job;
504 
505     if (DEBUG(JOB)) {
506 	(void)fprintf(debug_file, "JobCondPassSig(%d) called.\n", signo);
507     }
508 
509     for (job = job_table; job < job_table_end; job++) {
510 	if (job->job_state != JOB_ST_RUNNING)
511 	    continue;
512 	if (DEBUG(JOB)) {
513 	    (void)fprintf(debug_file,
514 			   "JobCondPassSig passing signal %d to child %d.\n",
515 			   signo, job->pid);
516 	}
517 	KILLPG(job->pid, signo);
518     }
519 }
520 
521 /*-
522  *-----------------------------------------------------------------------
523  * JobChldSig --
524  *	SIGCHLD handler.
525  *
526  * Input:
527  *	signo		The signal number we've received
528  *
529  * Results:
530  *	None.
531  *
532  * Side Effects:
533  *	Sends a token on the child exit pipe to wake us up from
534  *	select()/poll().
535  *
536  *-----------------------------------------------------------------------
537  */
538 static void
539 JobChildSig(int signo MAKE_ATTR_UNUSED)
540 {
541     while (write(childExitJob.outPipe, CHILD_EXIT, 1) == -1 && errno == EAGAIN)
542 	continue;
543 }
544 
545 
546 /*-
547  *-----------------------------------------------------------------------
548  * JobContinueSig --
549  *	Resume all stopped jobs.
550  *
551  * Input:
552  *	signo		The signal number we've received
553  *
554  * Results:
555  *	None.
556  *
557  * Side Effects:
558  *	Jobs start running again.
559  *
560  *-----------------------------------------------------------------------
561  */
562 static void
563 JobContinueSig(int signo MAKE_ATTR_UNUSED)
564 {
565     /*
566      * Defer sending to SIGCONT to our stopped children until we return
567      * from the signal handler.
568      */
569     while (write(childExitJob.outPipe, DO_JOB_RESUME, 1) == -1 &&
570 	errno == EAGAIN)
571 	continue;
572 }
573 
574 /*-
575  *-----------------------------------------------------------------------
576  * JobPassSig --
577  *	Pass a signal on to all jobs, then resend to ourselves.
578  *
579  * Input:
580  *	signo		The signal number we've received
581  *
582  * Results:
583  *	None.
584  *
585  * Side Effects:
586  *	We die by the same signal.
587  *
588  *-----------------------------------------------------------------------
589  */
590 MAKE_ATTR_DEAD static void
591 JobPassSig_int(int signo)
592 {
593     /* Run .INTERRUPT target then exit */
594     JobInterrupt(TRUE, signo);
595 }
596 
597 MAKE_ATTR_DEAD static void
598 JobPassSig_term(int signo)
599 {
600     /* Dont run .INTERRUPT target then exit */
601     JobInterrupt(FALSE, signo);
602 }
603 
604 static void
605 JobPassSig_suspend(int signo)
606 {
607     sigset_t nmask, omask;
608     struct sigaction act;
609 
610     /* Suppress job started/continued messages */
611     make_suspended = 1;
612 
613     /* Pass the signal onto every job */
614     JobCondPassSig(signo);
615 
616     /*
617      * Send ourselves the signal now we've given the message to everyone else.
618      * Note we block everything else possible while we're getting the signal.
619      * This ensures that all our jobs get continued when we wake up before
620      * we take any other signal.
621      */
622     sigfillset(&nmask);
623     sigdelset(&nmask, signo);
624     (void)sigprocmask(SIG_SETMASK, &nmask, &omask);
625 
626     act.sa_handler = SIG_DFL;
627     sigemptyset(&act.sa_mask);
628     act.sa_flags = 0;
629     (void)sigaction(signo, &act, NULL);
630 
631     if (DEBUG(JOB)) {
632 	(void)fprintf(debug_file,
633 		       "JobPassSig passing signal %d to self.\n", signo);
634     }
635 
636     (void)kill(getpid(), signo);
637 
638     /*
639      * We've been continued.
640      *
641      * A whole host of signals continue to happen!
642      * SIGCHLD for any processes that actually suspended themselves.
643      * SIGCHLD for any processes that exited while we were alseep.
644      * The SIGCONT that actually caused us to wakeup.
645      *
646      * Since we defer passing the SIGCONT on to our children until
647      * the main processing loop, we can be sure that all the SIGCHLD
648      * events will have happened by then - and that the waitpid() will
649      * collect the child 'suspended' events.
650      * For correct sequencing we just need to ensure we process the
651      * waitpid() before passign on the SIGCONT.
652      *
653      * In any case nothing else is needed here.
654      */
655 
656     /* Restore handler and signal mask */
657     act.sa_handler = JobPassSig_suspend;
658     (void)sigaction(signo, &act, NULL);
659     (void)sigprocmask(SIG_SETMASK, &omask, NULL);
660 }
661 
662 /*-
663  *-----------------------------------------------------------------------
664  * JobFindPid  --
665  *	Compare the pid of the job with the given pid and return 0 if they
666  *	are equal. This function is called from Job_CatchChildren
667  *	to find the job descriptor of the finished job.
668  *
669  * Input:
670  *	job		job to examine
671  *	pid		process id desired
672  *
673  * Results:
674  *	Job with matching pid
675  *
676  * Side Effects:
677  *	None
678  *-----------------------------------------------------------------------
679  */
680 static Job *
681 JobFindPid(int pid, int status, Boolean isJobs)
682 {
683     Job *job;
684 
685     for (job = job_table; job < job_table_end; job++) {
686 	if ((job->job_state == status) && job->pid == pid)
687 	    return job;
688     }
689     if (DEBUG(JOB) && isJobs)
690 	job_table_dump("no pid");
691     return NULL;
692 }
693 
694 /*-
695  *-----------------------------------------------------------------------
696  * JobPrintCommand  --
697  *	Put out another command for the given job. If the command starts
698  *	with an @ or a - we process it specially. In the former case,
699  *	so long as the -s and -n flags weren't given to make, we stick
700  *	a shell-specific echoOff command in the script. In the latter,
701  *	we ignore errors for the entire job, unless the shell has error
702  *	control.
703  *	If the command is just "..." we take all future commands for this
704  *	job to be commands to be executed once the entire graph has been
705  *	made and return non-zero to signal that the end of the commands
706  *	was reached. These commands are later attached to the postCommands
707  *	node and executed by Job_End when all things are done.
708  *	This function is called from JobStart via Lst_ForEach.
709  *
710  * Input:
711  *	cmdp		command string to print
712  *	jobp		job for which to print it
713  *
714  * Results:
715  *	Always 0, unless the command was "..."
716  *
717  * Side Effects:
718  *	If the command begins with a '-' and the shell has no error control,
719  *	the JOB_IGNERR flag is set in the job descriptor.
720  *	If the command is "..." and we're not ignoring such things,
721  *	tailCmds is set to the successor node of the cmd.
722  *	numCommands is incremented if the command is actually printed.
723  *-----------------------------------------------------------------------
724  */
725 static int
726 JobPrintCommand(void *cmdp, void *jobp)
727 {
728     Boolean	  noSpecials;	    /* true if we shouldn't worry about
729 				     * inserting special commands into
730 				     * the input stream. */
731     Boolean       shutUp = FALSE;   /* true if we put a no echo command
732 				     * into the command file */
733     Boolean	  errOff = FALSE;   /* true if we turned error checking
734 				     * off before printing the command
735 				     * and need to turn it back on */
736     const char    *cmdTemplate;	    /* Template to use when printing the
737 				     * command */
738     char    	  *cmdStart;	    /* Start of expanded command */
739     char	  *escCmd = NULL;    /* Command with quotes/backticks escaped */
740     char     	  *cmd = (char *)cmdp;
741     Job           *job = (Job *)jobp;
742     int           i, j;
743 
744     noSpecials = NoExecute(job->node);
745 
746     if (strcmp(cmd, "...") == 0) {
747 	job->node->type |= OP_SAVE_CMDS;
748 	if ((job->flags & JOB_IGNDOTS) == 0) {
749 	    job->tailCmds = Lst_Succ(Lst_Member(job->node->commands,
750 						cmd));
751 	    return 1;
752 	}
753 	return 0;
754     }
755 
756 #define DBPRINTF(fmt, arg) if (DEBUG(JOB)) {	\
757 	(void)fprintf(debug_file, fmt, arg); 	\
758     }						\
759    (void)fprintf(job->cmdFILE, fmt, arg);	\
760    (void)fflush(job->cmdFILE);
761 
762     numCommands += 1;
763 
764     cmdStart = cmd = Var_Subst(NULL, cmd, job->node, VARF_WANTRES);
765 
766     cmdTemplate = "%s\n";
767 
768     /*
769      * Check for leading @' and -'s to control echoing and error checking.
770      */
771     while (*cmd == '@' || *cmd == '-' || (*cmd == '+')) {
772 	switch (*cmd) {
773 	case '@':
774 	    shutUp = DEBUG(LOUD) ? FALSE : TRUE;
775 	    break;
776 	case '-':
777 	    errOff = TRUE;
778 	    break;
779 	case '+':
780 	    if (noSpecials) {
781 		/*
782 		 * We're not actually executing anything...
783 		 * but this one needs to be - use compat mode just for it.
784 		 */
785 		CompatRunCommand(cmdp, job->node);
786 		free(cmdStart);
787 		return 0;
788 	    }
789 	    break;
790 	}
791 	cmd++;
792     }
793 
794     while (isspace((unsigned char) *cmd))
795 	cmd++;
796 
797     /*
798      * If the shell doesn't have error control the alternate echo'ing will
799      * be done (to avoid showing additional error checking code)
800      * and this will need the characters '$ ` \ "' escaped
801      */
802 
803     if (!commandShell->hasErrCtl) {
804 	/* Worst that could happen is every char needs escaping. */
805 	escCmd = bmake_malloc((strlen(cmd) * 2) + 1);
806 	for (i = 0, j= 0; cmd[i] != '\0'; i++, j++) {
807 		if (cmd[i] == '$' || cmd[i] == '`' || cmd[i] == '\\' ||
808 			cmd[i] == '"')
809 			escCmd[j++] = '\\';
810 		escCmd[j] = cmd[i];
811 	}
812 	escCmd[j] = 0;
813     }
814 
815     if (shutUp) {
816 	if (!(job->flags & JOB_SILENT) && !noSpecials &&
817 	    commandShell->hasEchoCtl) {
818 		DBPRINTF("%s\n", commandShell->echoOff);
819 	} else {
820 	    if (commandShell->hasErrCtl)
821 		shutUp = FALSE;
822 	}
823     }
824 
825     if (errOff) {
826 	if (!noSpecials) {
827 	    if (commandShell->hasErrCtl) {
828 		/*
829 		 * we don't want the error-control commands showing
830 		 * up either, so we turn off echoing while executing
831 		 * them. We could put another field in the shell
832 		 * structure to tell JobDoOutput to look for this
833 		 * string too, but why make it any more complex than
834 		 * it already is?
835 		 */
836 		if (!(job->flags & JOB_SILENT) && !shutUp &&
837 		    commandShell->hasEchoCtl) {
838 			DBPRINTF("%s\n", commandShell->echoOff);
839 			DBPRINTF("%s\n", commandShell->ignErr);
840 			DBPRINTF("%s\n", commandShell->echoOn);
841 		} else {
842 			DBPRINTF("%s\n", commandShell->ignErr);
843 		}
844 	    } else if (commandShell->ignErr &&
845 		      (*commandShell->ignErr != '\0'))
846 	    {
847 		/*
848 		 * The shell has no error control, so we need to be
849 		 * weird to get it to ignore any errors from the command.
850 		 * If echoing is turned on, we turn it off and use the
851 		 * errCheck template to echo the command. Leave echoing
852 		 * off so the user doesn't see the weirdness we go through
853 		 * to ignore errors. Set cmdTemplate to use the weirdness
854 		 * instead of the simple "%s\n" template.
855 		 */
856 		job->flags |= JOB_IGNERR;
857 		if (!(job->flags & JOB_SILENT) && !shutUp) {
858 			if (commandShell->hasEchoCtl) {
859 				DBPRINTF("%s\n", commandShell->echoOff);
860 			}
861 			DBPRINTF(commandShell->errCheck, escCmd);
862 			shutUp = TRUE;
863 		} else {
864 			if (!shutUp) {
865 				DBPRINTF(commandShell->errCheck, escCmd);
866 			}
867 		}
868 		cmdTemplate = commandShell->ignErr;
869 		/*
870 		 * The error ignoration (hee hee) is already taken care
871 		 * of by the ignErr template, so pretend error checking
872 		 * is still on.
873 		 */
874 		errOff = FALSE;
875 	    } else {
876 		errOff = FALSE;
877 	    }
878 	} else {
879 	    errOff = FALSE;
880 	}
881     } else {
882 
883 	/*
884 	 * If errors are being checked and the shell doesn't have error control
885 	 * but does supply an errOut template, then setup commands to run
886 	 * through it.
887 	 */
888 
889 	if (!commandShell->hasErrCtl && commandShell->errOut &&
890 	    (*commandShell->errOut != '\0')) {
891 		if (!(job->flags & JOB_SILENT) && !shutUp) {
892 			if (commandShell->hasEchoCtl) {
893 				DBPRINTF("%s\n", commandShell->echoOff);
894 			}
895 			DBPRINTF(commandShell->errCheck, escCmd);
896 			shutUp = TRUE;
897 		}
898 		/* If it's a comment line or blank, treat as an ignored error */
899 		if ((escCmd[0] == commandShell->commentChar) ||
900 		    (escCmd[0] == 0))
901 			cmdTemplate = commandShell->ignErr;
902 		else
903 			cmdTemplate = commandShell->errOut;
904 		errOff = FALSE;
905 	}
906     }
907 
908     if (DEBUG(SHELL) && strcmp(shellName, "sh") == 0 &&
909 	(job->flags & JOB_TRACED) == 0) {
910 	    DBPRINTF("set -%s\n", "x");
911 	    job->flags |= JOB_TRACED;
912     }
913 
914     DBPRINTF(cmdTemplate, cmd);
915     free(cmdStart);
916     free(escCmd);
917     if (errOff) {
918 	/*
919 	 * If echoing is already off, there's no point in issuing the
920 	 * echoOff command. Otherwise we issue it and pretend it was on
921 	 * for the whole command...
922 	 */
923 	if (!shutUp && !(job->flags & JOB_SILENT) && commandShell->hasEchoCtl){
924 	    DBPRINTF("%s\n", commandShell->echoOff);
925 	    shutUp = TRUE;
926 	}
927 	DBPRINTF("%s\n", commandShell->errCheck);
928     }
929     if (shutUp && commandShell->hasEchoCtl) {
930 	DBPRINTF("%s\n", commandShell->echoOn);
931     }
932     return 0;
933 }
934 
935 /*-
936  *-----------------------------------------------------------------------
937  * JobSaveCommand --
938  *	Save a command to be executed when everything else is done.
939  *	Callback function for JobFinish...
940  *
941  * Results:
942  *	Always returns 0
943  *
944  * Side Effects:
945  *	The command is tacked onto the end of postCommands's commands list.
946  *
947  *-----------------------------------------------------------------------
948  */
949 static int
950 JobSaveCommand(void *cmd, void *gn)
951 {
952     cmd = Var_Subst(NULL, (char *)cmd, (GNode *)gn, VARF_WANTRES);
953     (void)Lst_AtEnd(postCommands->commands, cmd);
954     return 0;
955 }
956 
957 
958 /*-
959  *-----------------------------------------------------------------------
960  * JobClose --
961  *	Called to close both input and output pipes when a job is finished.
962  *
963  * Results:
964  *	Nada
965  *
966  * Side Effects:
967  *	The file descriptors associated with the job are closed.
968  *
969  *-----------------------------------------------------------------------
970  */
971 static void
972 JobClose(Job *job)
973 {
974     clearfd(job);
975     (void)close(job->outPipe);
976     job->outPipe = -1;
977 
978     JobDoOutput(job, TRUE);
979     (void)close(job->inPipe);
980     job->inPipe = -1;
981 }
982 
983 /*-
984  *-----------------------------------------------------------------------
985  * JobFinish  --
986  *	Do final processing for the given job including updating
987  *	parents and starting new jobs as available/necessary. Note
988  *	that we pay no attention to the JOB_IGNERR flag here.
989  *	This is because when we're called because of a noexecute flag
990  *	or something, jstat.w_status is 0 and when called from
991  *	Job_CatchChildren, the status is zeroed if it s/b ignored.
992  *
993  * Input:
994  *	job		job to finish
995  *	status		sub-why job went away
996  *
997  * Results:
998  *	None
999  *
1000  * Side Effects:
1001  *	Final commands for the job are placed on postCommands.
1002  *
1003  *	If we got an error and are aborting (aborting == ABORT_ERROR) and
1004  *	the job list is now empty, we are done for the day.
1005  *	If we recognized an error (errors !=0), we set the aborting flag
1006  *	to ABORT_ERROR so no more jobs will be started.
1007  *-----------------------------------------------------------------------
1008  */
1009 /*ARGSUSED*/
1010 static void
1011 JobFinish (Job *job, WAIT_T status)
1012 {
1013     Boolean 	 done, return_job_token;
1014 
1015     if (DEBUG(JOB)) {
1016 	fprintf(debug_file, "Jobfinish: %d [%s], status %d\n",
1017 				job->pid, job->node->name, status);
1018     }
1019 
1020     if ((WIFEXITED(status) &&
1021 	 (((WEXITSTATUS(status) != 0) && !(job->flags & JOB_IGNERR)))) ||
1022 	WIFSIGNALED(status))
1023     {
1024 	/*
1025 	 * If it exited non-zero and either we're doing things our
1026 	 * way or we're not ignoring errors, the job is finished.
1027 	 * Similarly, if the shell died because of a signal
1028 	 * the job is also finished. In these
1029 	 * cases, finish out the job's output before printing the exit
1030 	 * status...
1031 	 */
1032 	JobClose(job);
1033 	if (job->cmdFILE != NULL && job->cmdFILE != stdout) {
1034 	   (void)fclose(job->cmdFILE);
1035 	   job->cmdFILE = NULL;
1036 	}
1037 	done = TRUE;
1038     } else if (WIFEXITED(status)) {
1039 	/*
1040 	 * Deal with ignored errors in -B mode. We need to print a message
1041 	 * telling of the ignored error as well as setting status.w_status
1042 	 * to 0 so the next command gets run. To do this, we set done to be
1043 	 * TRUE if in -B mode and the job exited non-zero.
1044 	 */
1045 	done = WEXITSTATUS(status) != 0;
1046 	/*
1047 	 * Old comment said: "Note we don't
1048 	 * want to close down any of the streams until we know we're at the
1049 	 * end."
1050 	 * But we do. Otherwise when are we going to print the rest of the
1051 	 * stuff?
1052 	 */
1053 	JobClose(job);
1054     } else {
1055 	/*
1056 	 * No need to close things down or anything.
1057 	 */
1058 	done = FALSE;
1059     }
1060 
1061     if (done) {
1062 	if (WIFEXITED(status)) {
1063 	    if (DEBUG(JOB)) {
1064 		(void)fprintf(debug_file, "Process %d [%s] exited.\n",
1065 				job->pid, job->node->name);
1066 	    }
1067 	    if (WEXITSTATUS(status) != 0) {
1068 		if (job->node != lastNode) {
1069 		    MESSAGE(stdout, job->node);
1070 		    lastNode = job->node;
1071 		}
1072 #ifdef USE_META
1073 		if (useMeta) {
1074 		    meta_job_error(job, job->node, job->flags, WEXITSTATUS(status));
1075 		}
1076 #endif
1077 		if (!dieQuietly(job->node, -1))
1078 		    (void)printf("*** [%s] Error code %d%s\n",
1079 				 job->node->name,
1080 				 WEXITSTATUS(status),
1081 				 (job->flags & JOB_IGNERR) ? " (ignored)" : "");
1082 		if (job->flags & JOB_IGNERR) {
1083 		    WAIT_STATUS(status) = 0;
1084 		} else {
1085 		    if (deleteOnError) {
1086 			JobDeleteTarget(job->node);
1087 		    }
1088 		    PrintOnError(job->node, NULL);
1089 		}
1090 	    } else if (DEBUG(JOB)) {
1091 		if (job->node != lastNode) {
1092 		    MESSAGE(stdout, job->node);
1093 		    lastNode = job->node;
1094 		}
1095 		(void)printf("*** [%s] Completed successfully\n",
1096 				job->node->name);
1097 	    }
1098 	} else {
1099 	    if (job->node != lastNode) {
1100 		MESSAGE(stdout, job->node);
1101 		lastNode = job->node;
1102 	    }
1103 	    (void)printf("*** [%s] Signal %d\n",
1104 			job->node->name, WTERMSIG(status));
1105 	    if (deleteOnError) {
1106 		JobDeleteTarget(job->node);
1107 	    }
1108 	}
1109 	(void)fflush(stdout);
1110     }
1111 
1112 #ifdef USE_META
1113     if (useMeta) {
1114 	int x;
1115 
1116 	if ((x = meta_job_finish(job)) != 0 && status == 0) {
1117 	    status = x;
1118 	}
1119     }
1120 #endif
1121 
1122     return_job_token = FALSE;
1123 
1124     Trace_Log(JOBEND, job);
1125     if (!(job->flags & JOB_SPECIAL)) {
1126 	if ((WAIT_STATUS(status) != 0) ||
1127 		(aborting == ABORT_ERROR) ||
1128 		(aborting == ABORT_INTERRUPT))
1129 	    return_job_token = TRUE;
1130     }
1131 
1132     if ((aborting != ABORT_ERROR) && (aborting != ABORT_INTERRUPT) &&
1133 	(WAIT_STATUS(status) == 0)) {
1134 	/*
1135 	 * As long as we aren't aborting and the job didn't return a non-zero
1136 	 * status that we shouldn't ignore, we call Make_Update to update
1137 	 * the parents. In addition, any saved commands for the node are placed
1138 	 * on the .END target.
1139 	 */
1140 	if (job->tailCmds != NULL) {
1141 	    Lst_ForEachFrom(job->node->commands, job->tailCmds,
1142 			     JobSaveCommand,
1143 			    job->node);
1144 	}
1145 	job->node->made = MADE;
1146 	if (!(job->flags & JOB_SPECIAL))
1147 	    return_job_token = TRUE;
1148 	Make_Update(job->node);
1149 	job->job_state = JOB_ST_FREE;
1150     } else if (WAIT_STATUS(status)) {
1151 	errors += 1;
1152 	job->job_state = JOB_ST_FREE;
1153     }
1154 
1155     /*
1156      * Set aborting if any error.
1157      */
1158     if (errors && !keepgoing && (aborting != ABORT_INTERRUPT)) {
1159 	/*
1160 	 * If we found any errors in this batch of children and the -k flag
1161 	 * wasn't given, we set the aborting flag so no more jobs get
1162 	 * started.
1163 	 */
1164 	aborting = ABORT_ERROR;
1165     }
1166 
1167     if (return_job_token)
1168 	Job_TokenReturn();
1169 
1170     if (aborting == ABORT_ERROR && jobTokensRunning == 0) {
1171 	/*
1172 	 * If we are aborting and the job table is now empty, we finish.
1173 	 */
1174 	Finish(errors);
1175     }
1176 }
1177 
1178 /*-
1179  *-----------------------------------------------------------------------
1180  * Job_Touch --
1181  *	Touch the given target. Called by JobStart when the -t flag was
1182  *	given
1183  *
1184  * Input:
1185  *	gn		the node of the file to touch
1186  *	silent		TRUE if should not print message
1187  *
1188  * Results:
1189  *	None
1190  *
1191  * Side Effects:
1192  *	The data modification of the file is changed. In addition, if the
1193  *	file did not exist, it is created.
1194  *-----------------------------------------------------------------------
1195  */
1196 void
1197 Job_Touch(GNode *gn, Boolean silent)
1198 {
1199     int		  streamID;   	/* ID of stream opened to do the touch */
1200     struct utimbuf times;	/* Times for utime() call */
1201 
1202     if (gn->type & (OP_JOIN|OP_USE|OP_USEBEFORE|OP_EXEC|OP_OPTIONAL|
1203 	OP_SPECIAL|OP_PHONY)) {
1204 	/*
1205 	 * .JOIN, .USE, .ZEROTIME and .OPTIONAL targets are "virtual" targets
1206 	 * and, as such, shouldn't really be created.
1207 	 */
1208 	return;
1209     }
1210 
1211     if (!silent || NoExecute(gn)) {
1212 	(void)fprintf(stdout, "touch %s\n", gn->name);
1213 	(void)fflush(stdout);
1214     }
1215 
1216     if (NoExecute(gn)) {
1217 	return;
1218     }
1219 
1220     if (gn->type & OP_ARCHV) {
1221 	Arch_Touch(gn);
1222     } else if (gn->type & OP_LIB) {
1223 	Arch_TouchLib(gn);
1224     } else {
1225 	char	*file = gn->path ? gn->path : gn->name;
1226 
1227 	times.actime = times.modtime = now;
1228 	if (utime(file, &times) < 0){
1229 	    streamID = open(file, O_RDWR | O_CREAT, 0666);
1230 
1231 	    if (streamID >= 0) {
1232 		char	c;
1233 
1234 		/*
1235 		 * Read and write a byte to the file to change the
1236 		 * modification time, then close the file.
1237 		 */
1238 		if (read(streamID, &c, 1) == 1) {
1239 		    (void)lseek(streamID, (off_t)0, SEEK_SET);
1240 		    while (write(streamID, &c, 1) == -1 && errno == EAGAIN)
1241 			continue;
1242 		}
1243 
1244 		(void)close(streamID);
1245 	    } else {
1246 		(void)fprintf(stdout, "*** couldn't touch %s: %s",
1247 			       file, strerror(errno));
1248 		(void)fflush(stdout);
1249 	    }
1250 	}
1251     }
1252 }
1253 
1254 /*-
1255  *-----------------------------------------------------------------------
1256  * Job_CheckCommands --
1257  *	Make sure the given node has all the commands it needs.
1258  *
1259  * Input:
1260  *	gn		The target whose commands need verifying
1261  *	abortProc	Function to abort with message
1262  *
1263  * Results:
1264  *	TRUE if the commands list is/was ok.
1265  *
1266  * Side Effects:
1267  *	The node will have commands from the .DEFAULT rule added to it
1268  *	if it needs them.
1269  *-----------------------------------------------------------------------
1270  */
1271 Boolean
1272 Job_CheckCommands(GNode *gn, void (*abortProc)(const char *, ...))
1273 {
1274     if (OP_NOP(gn->type) && Lst_IsEmpty(gn->commands) &&
1275 	((gn->type & OP_LIB) == 0 || Lst_IsEmpty(gn->children))) {
1276 	/*
1277 	 * No commands. Look for .DEFAULT rule from which we might infer
1278 	 * commands
1279 	 */
1280 	if ((DEFAULT != NULL) && !Lst_IsEmpty(DEFAULT->commands) &&
1281 		(gn->type & OP_SPECIAL) == 0) {
1282 	    char *p1;
1283 	    /*
1284 	     * Make only looks for a .DEFAULT if the node was never the
1285 	     * target of an operator, so that's what we do too. If
1286 	     * a .DEFAULT was given, we substitute its commands for gn's
1287 	     * commands and set the IMPSRC variable to be the target's name
1288 	     * The DEFAULT node acts like a transformation rule, in that
1289 	     * gn also inherits any attributes or sources attached to
1290 	     * .DEFAULT itself.
1291 	     */
1292 	    Make_HandleUse(DEFAULT, gn);
1293 	    Var_Set(IMPSRC, Var_Value(TARGET, gn, &p1), gn);
1294 	    free(p1);
1295 	} else if (Dir_MTime(gn, 0) == 0 && (gn->type & OP_SPECIAL) == 0) {
1296 	    /*
1297 	     * The node wasn't the target of an operator we have no .DEFAULT
1298 	     * rule to go on and the target doesn't already exist. There's
1299 	     * nothing more we can do for this branch. If the -k flag wasn't
1300 	     * given, we stop in our tracks, otherwise we just don't update
1301 	     * this node's parents so they never get examined.
1302 	     */
1303 	    static const char msg[] = ": don't know how to make";
1304 
1305 	    if (gn->flags & FROM_DEPEND) {
1306 		if (!Job_RunTarget(".STALE", gn->fname))
1307 		    fprintf(stdout, "%s: %s, %d: ignoring stale %s for %s\n",
1308 			progname, gn->fname, gn->lineno, makeDependfile,
1309 			gn->name);
1310 		return TRUE;
1311 	    }
1312 
1313 	    if (gn->type & OP_OPTIONAL) {
1314 		(void)fprintf(stdout, "%s%s %s (ignored)\n", progname,
1315 		    msg, gn->name);
1316 		(void)fflush(stdout);
1317 	    } else if (keepgoing) {
1318 		(void)fprintf(stdout, "%s%s %s (continuing)\n", progname,
1319 		    msg, gn->name);
1320 		(void)fflush(stdout);
1321   		return FALSE;
1322 	    } else {
1323 		(*abortProc)("%s%s %s. Stop", progname, msg, gn->name);
1324 		return FALSE;
1325 	    }
1326 	}
1327     }
1328     return TRUE;
1329 }
1330 
1331 /*-
1332  *-----------------------------------------------------------------------
1333  * JobExec --
1334  *	Execute the shell for the given job. Called from JobStart
1335  *
1336  * Input:
1337  *	job		Job to execute
1338  *
1339  * Results:
1340  *	None.
1341  *
1342  * Side Effects:
1343  *	A shell is executed, outputs is altered and the Job structure added
1344  *	to the job table.
1345  *
1346  *-----------------------------------------------------------------------
1347  */
1348 static void
1349 JobExec(Job *job, char **argv)
1350 {
1351     int	    	  cpid;	    	/* ID of new child */
1352     sigset_t	  mask;
1353 
1354     job->flags &= ~JOB_TRACED;
1355 
1356     if (DEBUG(JOB)) {
1357 	int 	  i;
1358 
1359 	(void)fprintf(debug_file, "Running %s %sly\n", job->node->name, "local");
1360 	(void)fprintf(debug_file, "\tCommand: ");
1361 	for (i = 0; argv[i] != NULL; i++) {
1362 	    (void)fprintf(debug_file, "%s ", argv[i]);
1363 	}
1364  	(void)fprintf(debug_file, "\n");
1365     }
1366 
1367     /*
1368      * Some jobs produce no output and it's disconcerting to have
1369      * no feedback of their running (since they produce no output, the
1370      * banner with their name in it never appears). This is an attempt to
1371      * provide that feedback, even if nothing follows it.
1372      */
1373     if ((lastNode != job->node) && !(job->flags & JOB_SILENT)) {
1374 	MESSAGE(stdout, job->node);
1375 	lastNode = job->node;
1376     }
1377 
1378     /* No interruptions until this job is on the `jobs' list */
1379     JobSigLock(&mask);
1380 
1381     /* Pre-emptively mark job running, pid still zero though */
1382     job->job_state = JOB_ST_RUNNING;
1383 
1384     cpid = vFork();
1385     if (cpid == -1)
1386 	Punt("Cannot vfork: %s", strerror(errno));
1387 
1388     if (cpid == 0) {
1389 	/* Child */
1390 	sigset_t tmask;
1391 
1392 #ifdef USE_META
1393 	if (useMeta) {
1394 	    meta_job_child(job);
1395 	}
1396 #endif
1397 	/*
1398 	 * Reset all signal handlers; this is necessary because we also
1399 	 * need to unblock signals before we exec(2).
1400 	 */
1401 	JobSigReset();
1402 
1403 	/* Now unblock signals */
1404 	sigemptyset(&tmask);
1405 	JobSigUnlock(&tmask);
1406 
1407 	/*
1408 	 * Must duplicate the input stream down to the child's input and
1409 	 * reset it to the beginning (again). Since the stream was marked
1410 	 * close-on-exec, we must clear that bit in the new input.
1411 	 */
1412 	if (dup2(FILENO(job->cmdFILE), 0) == -1) {
1413 	    execError("dup2", "job->cmdFILE");
1414 	    _exit(1);
1415 	}
1416 	if (fcntl(0, F_SETFD, 0) == -1) {
1417 	    execError("fcntl clear close-on-exec", "stdin");
1418 	    _exit(1);
1419 	}
1420 	if (lseek(0, (off_t)0, SEEK_SET) == -1) {
1421 	    execError("lseek to 0", "stdin");
1422 	    _exit(1);
1423 	}
1424 
1425 	if (Always_pass_job_queue ||
1426 	    (job->node->type & (OP_MAKE | OP_SUBMAKE))) {
1427 		/*
1428 		 * Pass job token pipe to submakes.
1429 		 */
1430 		if (fcntl(tokenWaitJob.inPipe, F_SETFD, 0) == -1) {
1431 		    execError("clear close-on-exec", "tokenWaitJob.inPipe");
1432 		    _exit(1);
1433 		}
1434 		if (fcntl(tokenWaitJob.outPipe, F_SETFD, 0) == -1) {
1435 		    execError("clear close-on-exec", "tokenWaitJob.outPipe");
1436 		    _exit(1);
1437 		}
1438 	}
1439 
1440 	/*
1441 	 * Set up the child's output to be routed through the pipe
1442 	 * we've created for it.
1443 	 */
1444 	if (dup2(job->outPipe, 1) == -1) {
1445 	    execError("dup2", "job->outPipe");
1446 	    _exit(1);
1447 	}
1448 	/*
1449 	 * The output channels are marked close on exec. This bit was
1450 	 * duplicated by the dup2(on some systems), so we have to clear
1451 	 * it before routing the shell's error output to the same place as
1452 	 * its standard output.
1453 	 */
1454 	if (fcntl(1, F_SETFD, 0) == -1) {
1455 	    execError("clear close-on-exec", "stdout");
1456 	    _exit(1);
1457 	}
1458 	if (dup2(1, 2) == -1) {
1459 	    execError("dup2", "1, 2");
1460 	    _exit(1);
1461 	}
1462 
1463 	/*
1464 	 * We want to switch the child into a different process family so
1465 	 * we can kill it and all its descendants in one fell swoop,
1466 	 * by killing its process family, but not commit suicide.
1467 	 */
1468 #if defined(HAVE_SETPGID)
1469 	(void)setpgid(0, getpid());
1470 #else
1471 #if defined(HAVE_SETSID)
1472 	/* XXX: dsl - I'm sure this should be setpgrp()... */
1473 	(void)setsid();
1474 #else
1475 	(void)setpgrp(0, getpid());
1476 #endif
1477 #endif
1478 
1479 	Var_ExportVars();
1480 
1481 	(void)execv(shellPath, argv);
1482 	execError("exec", shellPath);
1483 	_exit(1);
1484     }
1485 
1486     /* Parent, continuing after the child exec */
1487     job->pid = cpid;
1488 
1489     Trace_Log(JOBSTART, job);
1490 
1491 #ifdef USE_META
1492     if (useMeta) {
1493 	meta_job_parent(job, cpid);
1494     }
1495 #endif
1496 
1497     /*
1498      * Set the current position in the buffer to the beginning
1499      * and mark another stream to watch in the outputs mask
1500      */
1501     job->curPos = 0;
1502 
1503     watchfd(job);
1504 
1505     if (job->cmdFILE != NULL && job->cmdFILE != stdout) {
1506 	(void)fclose(job->cmdFILE);
1507 	job->cmdFILE = NULL;
1508     }
1509 
1510     /*
1511      * Now the job is actually running, add it to the table.
1512      */
1513     if (DEBUG(JOB)) {
1514 	fprintf(debug_file, "JobExec(%s): pid %d added to jobs table\n",
1515 		job->node->name, job->pid);
1516 	job_table_dump("job started");
1517     }
1518     JobSigUnlock(&mask);
1519 }
1520 
1521 /*-
1522  *-----------------------------------------------------------------------
1523  * JobMakeArgv --
1524  *	Create the argv needed to execute the shell for a given job.
1525  *
1526  *
1527  * Results:
1528  *
1529  * Side Effects:
1530  *
1531  *-----------------------------------------------------------------------
1532  */
1533 static void
1534 JobMakeArgv(Job *job, char **argv)
1535 {
1536     int	    	  argc;
1537     static char args[10]; 	/* For merged arguments */
1538 
1539     argv[0] = UNCONST(shellName);
1540     argc = 1;
1541 
1542     if ((commandShell->exit && (*commandShell->exit != '-')) ||
1543 	(commandShell->echo && (*commandShell->echo != '-')))
1544     {
1545 	/*
1546 	 * At least one of the flags doesn't have a minus before it, so
1547 	 * merge them together. Have to do this because the *(&(@*#*&#$#
1548 	 * Bourne shell thinks its second argument is a file to source.
1549 	 * Grrrr. Note the ten-character limitation on the combined arguments.
1550 	 */
1551 	(void)snprintf(args, sizeof(args), "-%s%s",
1552 		      ((job->flags & JOB_IGNERR) ? "" :
1553 		       (commandShell->exit ? commandShell->exit : "")),
1554 		      ((job->flags & JOB_SILENT) ? "" :
1555 		       (commandShell->echo ? commandShell->echo : "")));
1556 
1557 	if (args[1]) {
1558 	    argv[argc] = args;
1559 	    argc++;
1560 	}
1561     } else {
1562 	if (!(job->flags & JOB_IGNERR) && commandShell->exit) {
1563 	    argv[argc] = UNCONST(commandShell->exit);
1564 	    argc++;
1565 	}
1566 	if (!(job->flags & JOB_SILENT) && commandShell->echo) {
1567 	    argv[argc] = UNCONST(commandShell->echo);
1568 	    argc++;
1569 	}
1570     }
1571     argv[argc] = NULL;
1572 }
1573 
1574 /*-
1575  *-----------------------------------------------------------------------
1576  * JobStart  --
1577  *	Start a target-creation process going for the target described
1578  *	by the graph node gn.
1579  *
1580  * Input:
1581  *	gn		target to create
1582  *	flags		flags for the job to override normal ones.
1583  *			e.g. JOB_SPECIAL or JOB_IGNDOTS
1584  *	previous	The previous Job structure for this node, if any.
1585  *
1586  * Results:
1587  *	JOB_ERROR if there was an error in the commands, JOB_FINISHED
1588  *	if there isn't actually anything left to do for the job and
1589  *	JOB_RUNNING if the job has been started.
1590  *
1591  * Side Effects:
1592  *	A new Job node is created and added to the list of running
1593  *	jobs. PMake is forked and a child shell created.
1594  *
1595  * NB: I'm fairly sure that this code is never called with JOB_SPECIAL set
1596  *     JOB_IGNDOTS is never set (dsl)
1597  *     Also the return value is ignored by everyone.
1598  *-----------------------------------------------------------------------
1599  */
1600 static int
1601 JobStart(GNode *gn, int flags)
1602 {
1603     Job		  *job;       /* new job descriptor */
1604     char	  *argv[10];  /* Argument vector to shell */
1605     Boolean	  cmdsOK;     /* true if the nodes commands were all right */
1606     Boolean 	  noExec;     /* Set true if we decide not to run the job */
1607     int		  tfd;	      /* File descriptor to the temp file */
1608 
1609     for (job = job_table; job < job_table_end; job++) {
1610 	if (job->job_state == JOB_ST_FREE)
1611 	    break;
1612     }
1613     if (job >= job_table_end)
1614 	Punt("JobStart no job slots vacant");
1615 
1616     memset(job, 0, sizeof *job);
1617     job->job_state = JOB_ST_SETUP;
1618     if (gn->type & OP_SPECIAL)
1619 	flags |= JOB_SPECIAL;
1620 
1621     job->node = gn;
1622     job->tailCmds = NULL;
1623 
1624     /*
1625      * Set the initial value of the flags for this job based on the global
1626      * ones and the node's attributes... Any flags supplied by the caller
1627      * are also added to the field.
1628      */
1629     job->flags = 0;
1630     if (Targ_Ignore(gn)) {
1631 	job->flags |= JOB_IGNERR;
1632     }
1633     if (Targ_Silent(gn)) {
1634 	job->flags |= JOB_SILENT;
1635     }
1636     job->flags |= flags;
1637 
1638     /*
1639      * Check the commands now so any attributes from .DEFAULT have a chance
1640      * to migrate to the node
1641      */
1642     cmdsOK = Job_CheckCommands(gn, Error);
1643 
1644     job->inPollfd = NULL;
1645     /*
1646      * If the -n flag wasn't given, we open up OUR (not the child's)
1647      * temporary file to stuff commands in it. The thing is rd/wr so we don't
1648      * need to reopen it to feed it to the shell. If the -n flag *was* given,
1649      * we just set the file to be stdout. Cute, huh?
1650      */
1651     if (((gn->type & OP_MAKE) && !(noRecursiveExecute)) ||
1652 	    (!noExecute && !touchFlag)) {
1653 	/*
1654 	 * tfile is the name of a file into which all shell commands are
1655 	 * put. It is removed before the child shell is executed, unless
1656 	 * DEBUG(SCRIPT) is set.
1657 	 */
1658 	char *tfile;
1659 	sigset_t mask;
1660 	/*
1661 	 * We're serious here, but if the commands were bogus, we're
1662 	 * also dead...
1663 	 */
1664 	if (!cmdsOK) {
1665 	    PrintOnError(gn, NULL);	/* provide some clue */
1666 	    DieHorribly();
1667 	}
1668 
1669 	JobSigLock(&mask);
1670 	tfd = mkTempFile(TMPPAT, &tfile);
1671 	if (!DEBUG(SCRIPT))
1672 		(void)eunlink(tfile);
1673 	JobSigUnlock(&mask);
1674 
1675 	job->cmdFILE = fdopen(tfd, "w+");
1676 	if (job->cmdFILE == NULL) {
1677 	    Punt("Could not fdopen %s", tfile);
1678 	}
1679 	(void)fcntl(FILENO(job->cmdFILE), F_SETFD, FD_CLOEXEC);
1680 	/*
1681 	 * Send the commands to the command file, flush all its buffers then
1682 	 * rewind and remove the thing.
1683 	 */
1684 	noExec = FALSE;
1685 
1686 #ifdef USE_META
1687 	if (useMeta) {
1688 	    meta_job_start(job, gn);
1689 	    if (Targ_Silent(gn)) {	/* might have changed */
1690 		job->flags |= JOB_SILENT;
1691 	    }
1692 	}
1693 #endif
1694 	/*
1695 	 * We can do all the commands at once. hooray for sanity
1696 	 */
1697 	numCommands = 0;
1698 	Lst_ForEach(gn->commands, JobPrintCommand, job);
1699 
1700 	/*
1701 	 * If we didn't print out any commands to the shell script,
1702 	 * there's not much point in executing the shell, is there?
1703 	 */
1704 	if (numCommands == 0) {
1705 	    noExec = TRUE;
1706 	}
1707 
1708 	free(tfile);
1709     } else if (NoExecute(gn)) {
1710 	/*
1711 	 * Not executing anything -- just print all the commands to stdout
1712 	 * in one fell swoop. This will still set up job->tailCmds correctly.
1713 	 */
1714 	if (lastNode != gn) {
1715 	    MESSAGE(stdout, gn);
1716 	    lastNode = gn;
1717 	}
1718 	job->cmdFILE = stdout;
1719 	/*
1720 	 * Only print the commands if they're ok, but don't die if they're
1721 	 * not -- just let the user know they're bad and keep going. It
1722 	 * doesn't do any harm in this case and may do some good.
1723 	 */
1724 	if (cmdsOK) {
1725 	    Lst_ForEach(gn->commands, JobPrintCommand, job);
1726 	}
1727 	/*
1728 	 * Don't execute the shell, thank you.
1729 	 */
1730 	noExec = TRUE;
1731     } else {
1732 	/*
1733 	 * Just touch the target and note that no shell should be executed.
1734 	 * Set cmdFILE to stdout to make life easier. Check the commands, too,
1735 	 * but don't die if they're no good -- it does no harm to keep working
1736 	 * up the graph.
1737 	 */
1738 	job->cmdFILE = stdout;
1739     	Job_Touch(gn, job->flags&JOB_SILENT);
1740 	noExec = TRUE;
1741     }
1742     /* Just in case it isn't already... */
1743     (void)fflush(job->cmdFILE);
1744 
1745     /*
1746      * If we're not supposed to execute a shell, don't.
1747      */
1748     if (noExec) {
1749 	if (!(job->flags & JOB_SPECIAL))
1750 	    Job_TokenReturn();
1751 	/*
1752 	 * Unlink and close the command file if we opened one
1753 	 */
1754 	if (job->cmdFILE != stdout) {
1755 	    if (job->cmdFILE != NULL) {
1756 		(void)fclose(job->cmdFILE);
1757 		job->cmdFILE = NULL;
1758 	    }
1759 	}
1760 
1761 	/*
1762 	 * We only want to work our way up the graph if we aren't here because
1763 	 * the commands for the job were no good.
1764 	 */
1765 	if (cmdsOK && aborting == 0) {
1766 	    if (job->tailCmds != NULL) {
1767 		Lst_ForEachFrom(job->node->commands, job->tailCmds,
1768 				JobSaveCommand,
1769 			       job->node);
1770 	    }
1771 	    job->node->made = MADE;
1772 	    Make_Update(job->node);
1773 	}
1774 	job->job_state = JOB_ST_FREE;
1775 	return cmdsOK ? JOB_FINISHED : JOB_ERROR;
1776     }
1777 
1778     /*
1779      * Set up the control arguments to the shell. This is based on the flags
1780      * set earlier for this job.
1781      */
1782     JobMakeArgv(job, argv);
1783 
1784     /* Create the pipe by which we'll get the shell's output.  */
1785     JobCreatePipe(job, 3);
1786 
1787     JobExec(job, argv);
1788     return JOB_RUNNING;
1789 }
1790 
1791 static char *
1792 JobOutput(Job *job, char *cp, char *endp, int msg)
1793 {
1794     char *ecp;
1795 
1796     if (commandShell->noPrint) {
1797 	ecp = Str_FindSubstring(cp, commandShell->noPrint);
1798 	while (ecp != NULL) {
1799 	    if (cp != ecp) {
1800 		*ecp = '\0';
1801 		if (!beSilent && msg && job->node != lastNode) {
1802 		    MESSAGE(stdout, job->node);
1803 		    lastNode = job->node;
1804 		}
1805 		/*
1806 		 * The only way there wouldn't be a newline after
1807 		 * this line is if it were the last in the buffer.
1808 		 * however, since the non-printable comes after it,
1809 		 * there must be a newline, so we don't print one.
1810 		 */
1811 		(void)fprintf(stdout, "%s", cp);
1812 		(void)fflush(stdout);
1813 	    }
1814 	    cp = ecp + commandShell->noPLen;
1815 	    if (cp != endp) {
1816 		/*
1817 		 * Still more to print, look again after skipping
1818 		 * the whitespace following the non-printable
1819 		 * command....
1820 		 */
1821 		cp++;
1822 		while (*cp == ' ' || *cp == '\t' || *cp == '\n') {
1823 		    cp++;
1824 		}
1825 		ecp = Str_FindSubstring(cp, commandShell->noPrint);
1826 	    } else {
1827 		return cp;
1828 	    }
1829 	}
1830     }
1831     return cp;
1832 }
1833 
1834 /*-
1835  *-----------------------------------------------------------------------
1836  * JobDoOutput  --
1837  *	This function is called at different times depending on
1838  *	whether the user has specified that output is to be collected
1839  *	via pipes or temporary files. In the former case, we are called
1840  *	whenever there is something to read on the pipe. We collect more
1841  *	output from the given job and store it in the job's outBuf. If
1842  *	this makes up a line, we print it tagged by the job's identifier,
1843  *	as necessary.
1844  *	If output has been collected in a temporary file, we open the
1845  *	file and read it line by line, transfering it to our own
1846  *	output channel until the file is empty. At which point we
1847  *	remove the temporary file.
1848  *	In both cases, however, we keep our figurative eye out for the
1849  *	'noPrint' line for the shell from which the output came. If
1850  *	we recognize a line, we don't print it. If the command is not
1851  *	alone on the line (the character after it is not \0 or \n), we
1852  *	do print whatever follows it.
1853  *
1854  * Input:
1855  *	job		the job whose output needs printing
1856  *	finish		TRUE if this is the last time we'll be called
1857  *			for this job
1858  *
1859  * Results:
1860  *	None
1861  *
1862  * Side Effects:
1863  *	curPos may be shifted as may the contents of outBuf.
1864  *-----------------------------------------------------------------------
1865  */
1866 STATIC void
1867 JobDoOutput(Job *job, Boolean finish)
1868 {
1869     Boolean       gotNL = FALSE;  /* true if got a newline */
1870     Boolean       fbuf;  	  /* true if our buffer filled up */
1871     int		  nr;	      	  /* number of bytes read */
1872     int		  i;	      	  /* auxiliary index into outBuf */
1873     int		  max;	      	  /* limit for i (end of current data) */
1874     int		  nRead;      	  /* (Temporary) number of bytes read */
1875 
1876     /*
1877      * Read as many bytes as will fit in the buffer.
1878      */
1879 end_loop:
1880     gotNL = FALSE;
1881     fbuf = FALSE;
1882 
1883     nRead = read(job->inPipe, &job->outBuf[job->curPos],
1884 		     JOB_BUFSIZE - job->curPos);
1885     if (nRead < 0) {
1886 	if (errno == EAGAIN)
1887 	    return;
1888 	if (DEBUG(JOB)) {
1889 	    perror("JobDoOutput(piperead)");
1890 	}
1891 	nr = 0;
1892     } else {
1893 	nr = nRead;
1894     }
1895 
1896     /*
1897      * If we hit the end-of-file (the job is dead), we must flush its
1898      * remaining output, so pretend we read a newline if there's any
1899      * output remaining in the buffer.
1900      * Also clear the 'finish' flag so we stop looping.
1901      */
1902     if ((nr == 0) && (job->curPos != 0)) {
1903 	job->outBuf[job->curPos] = '\n';
1904 	nr = 1;
1905 	finish = FALSE;
1906     } else if (nr == 0) {
1907 	finish = FALSE;
1908     }
1909 
1910     /*
1911      * Look for the last newline in the bytes we just got. If there is
1912      * one, break out of the loop with 'i' as its index and gotNL set
1913      * TRUE.
1914      */
1915     max = job->curPos + nr;
1916     for (i = job->curPos + nr - 1; i >= job->curPos; i--) {
1917 	if (job->outBuf[i] == '\n') {
1918 	    gotNL = TRUE;
1919 	    break;
1920 	} else if (job->outBuf[i] == '\0') {
1921 	    /*
1922 	     * Why?
1923 	     */
1924 	    job->outBuf[i] = ' ';
1925 	}
1926     }
1927 
1928     if (!gotNL) {
1929 	job->curPos += nr;
1930 	if (job->curPos == JOB_BUFSIZE) {
1931 	    /*
1932 	     * If we've run out of buffer space, we have no choice
1933 	     * but to print the stuff. sigh.
1934 	     */
1935 	    fbuf = TRUE;
1936 	    i = job->curPos;
1937 	}
1938     }
1939     if (gotNL || fbuf) {
1940 	/*
1941 	 * Need to send the output to the screen. Null terminate it
1942 	 * first, overwriting the newline character if there was one.
1943 	 * So long as the line isn't one we should filter (according
1944 	 * to the shell description), we print the line, preceded
1945 	 * by a target banner if this target isn't the same as the
1946 	 * one for which we last printed something.
1947 	 * The rest of the data in the buffer are then shifted down
1948 	 * to the start of the buffer and curPos is set accordingly.
1949 	 */
1950 	job->outBuf[i] = '\0';
1951 	if (i >= job->curPos) {
1952 	    char *cp;
1953 
1954 	    cp = JobOutput(job, job->outBuf, &job->outBuf[i], FALSE);
1955 
1956 	    /*
1957 	     * There's still more in that thar buffer. This time, though,
1958 	     * we know there's no newline at the end, so we add one of
1959 	     * our own free will.
1960 	     */
1961 	    if (*cp != '\0') {
1962 		if (!beSilent && job->node != lastNode) {
1963 		    MESSAGE(stdout, job->node);
1964 		    lastNode = job->node;
1965 		}
1966 #ifdef USE_META
1967 		if (useMeta) {
1968 		    meta_job_output(job, cp, gotNL ? "\n" : "");
1969 		}
1970 #endif
1971 		(void)fprintf(stdout, "%s%s", cp, gotNL ? "\n" : "");
1972 		(void)fflush(stdout);
1973 	    }
1974 	}
1975 	/*
1976 	 * max is the last offset still in the buffer. Move any remaining
1977 	 * characters to the start of the buffer and update the end marker
1978 	 * curPos.
1979 	 */
1980 	if (i < max) {
1981 	    (void)memmove(job->outBuf, &job->outBuf[i + 1], max - (i + 1));
1982 	    job->curPos = max - (i + 1);
1983 	} else {
1984 	    assert(i == max);
1985 	    job->curPos = 0;
1986 	}
1987     }
1988     if (finish) {
1989 	/*
1990 	 * If the finish flag is true, we must loop until we hit
1991 	 * end-of-file on the pipe. This is guaranteed to happen
1992 	 * eventually since the other end of the pipe is now closed
1993 	 * (we closed it explicitly and the child has exited). When
1994 	 * we do get an EOF, finish will be set FALSE and we'll fall
1995 	 * through and out.
1996 	 */
1997 	goto end_loop;
1998     }
1999 }
2000 
2001 static void
2002 JobRun(GNode *targ)
2003 {
2004 #ifdef notyet
2005     /*
2006      * Unfortunately it is too complicated to run .BEGIN, .END,
2007      * and .INTERRUPT job in the parallel job module. This has
2008      * the nice side effect that it avoids a lot of other problems.
2009      */
2010     Lst lst = Lst_Init(FALSE);
2011     Lst_AtEnd(lst, targ);
2012     (void)Make_Run(lst);
2013     Lst_Destroy(lst, NULL);
2014     JobStart(targ, JOB_SPECIAL);
2015     while (jobTokensRunning) {
2016 	Job_CatchOutput();
2017     }
2018 #else
2019     Compat_Make(targ, targ);
2020     if (targ->made == ERROR) {
2021 	PrintOnError(targ, "\n\nStop.");
2022 	exit(1);
2023     }
2024 #endif
2025 }
2026 
2027 /*-
2028  *-----------------------------------------------------------------------
2029  * Job_CatchChildren --
2030  *	Handle the exit of a child. Called from Make_Make.
2031  *
2032  * Input:
2033  *	block		TRUE if should block on the wait
2034  *
2035  * Results:
2036  *	none.
2037  *
2038  * Side Effects:
2039  *	The job descriptor is removed from the list of children.
2040  *
2041  * Notes:
2042  *	We do waits, blocking or not, according to the wisdom of our
2043  *	caller, until there are no more children to report. For each
2044  *	job, call JobFinish to finish things off.
2045  *
2046  *-----------------------------------------------------------------------
2047  */
2048 
2049 void
2050 Job_CatchChildren(void)
2051 {
2052     int    	  pid;	    	/* pid of dead child */
2053     WAIT_T	  status;   	/* Exit/termination status */
2054 
2055     /*
2056      * Don't even bother if we know there's no one around.
2057      */
2058     if (jobTokensRunning == 0)
2059 	return;
2060 
2061     while ((pid = waitpid((pid_t) -1, &status, WNOHANG | WUNTRACED)) > 0) {
2062 	if (DEBUG(JOB)) {
2063 	    (void)fprintf(debug_file, "Process %d exited/stopped status %x.\n", pid,
2064 	      WAIT_STATUS(status));
2065 	}
2066 	JobReapChild(pid, status, TRUE);
2067     }
2068 }
2069 
2070 /*
2071  * It is possible that wait[pid]() was called from elsewhere,
2072  * this lets us reap jobs regardless.
2073  */
2074 void
2075 JobReapChild(pid_t pid, WAIT_T status, Boolean isJobs)
2076 {
2077     Job		  *job;	    	/* job descriptor for dead child */
2078 
2079     /*
2080      * Don't even bother if we know there's no one around.
2081      */
2082     if (jobTokensRunning == 0)
2083 	return;
2084 
2085     job = JobFindPid(pid, JOB_ST_RUNNING, isJobs);
2086     if (job == NULL) {
2087 	if (isJobs) {
2088 	    if (!lurking_children)
2089 		Error("Child (%d) status %x not in table?", pid, status);
2090 	}
2091 	return;				/* not ours */
2092     }
2093     if (WIFSTOPPED(status)) {
2094 	if (DEBUG(JOB)) {
2095 	    (void)fprintf(debug_file, "Process %d (%s) stopped.\n",
2096 			  job->pid, job->node->name);
2097 	}
2098 	if (!make_suspended) {
2099 	    switch (WSTOPSIG(status)) {
2100 	    case SIGTSTP:
2101 		(void)printf("*** [%s] Suspended\n", job->node->name);
2102 		break;
2103 	    case SIGSTOP:
2104 		(void)printf("*** [%s] Stopped\n", job->node->name);
2105 		break;
2106 	    default:
2107 		(void)printf("*** [%s] Stopped -- signal %d\n",
2108 			     job->node->name, WSTOPSIG(status));
2109 	    }
2110 	    job->job_suspended = 1;
2111 	}
2112 	(void)fflush(stdout);
2113 	return;
2114     }
2115 
2116     job->job_state = JOB_ST_FINISHED;
2117     job->exit_status = WAIT_STATUS(status);
2118 
2119     JobFinish(job, status);
2120 }
2121 
2122 /*-
2123  *-----------------------------------------------------------------------
2124  * Job_CatchOutput --
2125  *	Catch the output from our children, if we're using
2126  *	pipes do so. Otherwise just block time until we get a
2127  *	signal(most likely a SIGCHLD) since there's no point in
2128  *	just spinning when there's nothing to do and the reaping
2129  *	of a child can wait for a while.
2130  *
2131  * Results:
2132  *	None
2133  *
2134  * Side Effects:
2135  *	Output is read from pipes if we're piping.
2136  * -----------------------------------------------------------------------
2137  */
2138 void
2139 Job_CatchOutput(void)
2140 {
2141     int nready;
2142     Job *job;
2143     int i;
2144 
2145     (void)fflush(stdout);
2146 
2147     /* The first fd in the list is the job token pipe */
2148     do {
2149 	nready = poll(fds + 1 - wantToken, nfds - 1 + wantToken, POLL_MSEC);
2150     } while (nready < 0 && errno == EINTR);
2151 
2152     if (nready < 0)
2153 	Punt("poll: %s", strerror(errno));
2154 
2155     if (nready > 0 && readyfd(&childExitJob)) {
2156 	char token = 0;
2157 	ssize_t count;
2158 	count = read(childExitJob.inPipe, &token, 1);
2159 	switch (count) {
2160 	case 0:
2161 	    Punt("unexpected eof on token pipe");
2162 	case -1:
2163 	    Punt("token pipe read: %s", strerror(errno));
2164 	case 1:
2165 	    if (token == DO_JOB_RESUME[0])
2166 		/* Complete relay requested from our SIGCONT handler */
2167 		JobRestartJobs();
2168 	    break;
2169 	default:
2170 	    abort();
2171 	}
2172 	--nready;
2173     }
2174 
2175     Job_CatchChildren();
2176     if (nready == 0)
2177 	    return;
2178 
2179     for (i = npseudojobs*nfds_per_job(); i < nfds; i++) {
2180 	if (!fds[i].revents)
2181 	    continue;
2182 	job = jobfds[i];
2183 	if (job->job_state == JOB_ST_RUNNING)
2184 	    JobDoOutput(job, FALSE);
2185 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
2186 	/*
2187 	 * With meta mode, we may have activity on the job's filemon
2188 	 * descriptor too, which at the moment is any pollfd other than
2189 	 * job->inPollfd.
2190 	 */
2191 	if (useMeta && job->inPollfd != &fds[i]) {
2192 	    if (meta_job_event(job) <= 0) {
2193 		fds[i].events = 0; /* never mind */
2194 	    }
2195 	}
2196 #endif
2197 	if (--nready == 0)
2198 		return;
2199     }
2200 }
2201 
2202 /*-
2203  *-----------------------------------------------------------------------
2204  * Job_Make --
2205  *	Start the creation of a target. Basically a front-end for
2206  *	JobStart used by the Make module.
2207  *
2208  * Results:
2209  *	None.
2210  *
2211  * Side Effects:
2212  *	Another job is started.
2213  *
2214  *-----------------------------------------------------------------------
2215  */
2216 void
2217 Job_Make(GNode *gn)
2218 {
2219     (void)JobStart(gn, 0);
2220 }
2221 
2222 void
2223 Shell_Init(void)
2224 {
2225     if (shellPath == NULL) {
2226 	/*
2227 	 * We are using the default shell, which may be an absolute
2228 	 * path if DEFSHELL_CUSTOM is defined.
2229 	 */
2230 	shellName = commandShell->name;
2231 #ifdef DEFSHELL_CUSTOM
2232 	if (*shellName == '/') {
2233 	    shellPath = shellName;
2234 	    shellName = strrchr(shellPath, '/');
2235 	    shellName++;
2236 	} else
2237 #endif
2238 	shellPath = str_concat(_PATH_DEFSHELLDIR, shellName, STR_ADDSLASH);
2239     }
2240     if (commandShell->exit == NULL) {
2241 	commandShell->exit = "";
2242     }
2243     if (commandShell->echo == NULL) {
2244 	commandShell->echo = "";
2245     }
2246     if (commandShell->hasErrCtl && *commandShell->exit) {
2247 	if (shellErrFlag &&
2248 	    strcmp(commandShell->exit, &shellErrFlag[1]) != 0) {
2249 	    free(shellErrFlag);
2250 	    shellErrFlag = NULL;
2251 	}
2252 	if (!shellErrFlag) {
2253 	    int n = strlen(commandShell->exit) + 2;
2254 
2255 	    shellErrFlag = bmake_malloc(n);
2256 	    if (shellErrFlag) {
2257 		snprintf(shellErrFlag, n, "-%s", commandShell->exit);
2258 	    }
2259 	}
2260     } else if (shellErrFlag) {
2261 	free(shellErrFlag);
2262 	shellErrFlag = NULL;
2263     }
2264 }
2265 
2266 /*-
2267  * Returns the string literal that is used in the current command shell
2268  * to produce a newline character.
2269  */
2270 const char *
2271 Shell_GetNewline(void)
2272 {
2273 
2274     return commandShell->newline;
2275 }
2276 
2277 void
2278 Job_SetPrefix(void)
2279 {
2280 
2281     if (targPrefix) {
2282 	free(targPrefix);
2283     } else if (!Var_Exists(MAKE_JOB_PREFIX, VAR_GLOBAL)) {
2284 	Var_Set(MAKE_JOB_PREFIX, "---", VAR_GLOBAL);
2285     }
2286 
2287     targPrefix = Var_Subst(NULL, "${" MAKE_JOB_PREFIX "}",
2288 			   VAR_GLOBAL, VARF_WANTRES);
2289 }
2290 
2291 /*-
2292  *-----------------------------------------------------------------------
2293  * Job_Init --
2294  *	Initialize the process module
2295  *
2296  * Input:
2297  *
2298  * Results:
2299  *	none
2300  *
2301  * Side Effects:
2302  *	lists and counters are initialized
2303  *-----------------------------------------------------------------------
2304  */
2305 void
2306 Job_Init(void)
2307 {
2308     Job_SetPrefix();
2309     /* Allocate space for all the job info */
2310     job_table = bmake_malloc(maxJobs * sizeof *job_table);
2311     memset(job_table, 0, maxJobs * sizeof *job_table);
2312     job_table_end = job_table + maxJobs;
2313     wantToken =	0;
2314 
2315     aborting = 	  0;
2316     errors = 	  0;
2317 
2318     lastNode =	  NULL;
2319 
2320     Always_pass_job_queue = getBoolean(MAKE_ALWAYS_PASS_JOB_QUEUE,
2321 				       Always_pass_job_queue);
2322 
2323     Job_error_token = getBoolean(MAKE_JOB_ERROR_TOKEN, Job_error_token);
2324 
2325 
2326     /*
2327      * There is a non-zero chance that we already have children.
2328      * eg after 'make -f- <<EOF'
2329      * Since their termination causes a 'Child (pid) not in table' message,
2330      * Collect the status of any that are already dead, and suppress the
2331      * error message if there are any undead ones.
2332      */
2333     for (;;) {
2334 	int rval, status;
2335 	rval = waitpid((pid_t) -1, &status, WNOHANG);
2336 	if (rval > 0)
2337 	    continue;
2338 	if (rval == 0)
2339 	    lurking_children = 1;
2340 	break;
2341     }
2342 
2343     Shell_Init();
2344 
2345     JobCreatePipe(&childExitJob, 3);
2346 
2347     /* Preallocate enough for the maximum number of jobs.  */
2348     fds = bmake_malloc(sizeof(*fds) *
2349 	(npseudojobs + maxJobs) * nfds_per_job());
2350     jobfds = bmake_malloc(sizeof(*jobfds) *
2351 	(npseudojobs + maxJobs) * nfds_per_job());
2352 
2353     /* These are permanent entries and take slots 0 and 1 */
2354     watchfd(&tokenWaitJob);
2355     watchfd(&childExitJob);
2356 
2357     sigemptyset(&caught_signals);
2358     /*
2359      * Install a SIGCHLD handler.
2360      */
2361     (void)bmake_signal(SIGCHLD, JobChildSig);
2362     sigaddset(&caught_signals, SIGCHLD);
2363 
2364 #define ADDSIG(s,h)				\
2365     if (bmake_signal(s, SIG_IGN) != SIG_IGN) {	\
2366 	sigaddset(&caught_signals, s);		\
2367 	(void)bmake_signal(s, h);			\
2368     }
2369 
2370     /*
2371      * Catch the four signals that POSIX specifies if they aren't ignored.
2372      * JobPassSig will take care of calling JobInterrupt if appropriate.
2373      */
2374     ADDSIG(SIGINT, JobPassSig_int)
2375     ADDSIG(SIGHUP, JobPassSig_term)
2376     ADDSIG(SIGTERM, JobPassSig_term)
2377     ADDSIG(SIGQUIT, JobPassSig_term)
2378 
2379     /*
2380      * There are additional signals that need to be caught and passed if
2381      * either the export system wants to be told directly of signals or if
2382      * we're giving each job its own process group (since then it won't get
2383      * signals from the terminal driver as we own the terminal)
2384      */
2385     ADDSIG(SIGTSTP, JobPassSig_suspend)
2386     ADDSIG(SIGTTOU, JobPassSig_suspend)
2387     ADDSIG(SIGTTIN, JobPassSig_suspend)
2388     ADDSIG(SIGWINCH, JobCondPassSig)
2389     ADDSIG(SIGCONT, JobContinueSig)
2390 #undef ADDSIG
2391 
2392     (void)Job_RunTarget(".BEGIN", NULL);
2393     postCommands = Targ_FindNode(".END", TARG_CREATE);
2394 }
2395 
2396 static void JobSigReset(void)
2397 {
2398 #define DELSIG(s)					\
2399     if (sigismember(&caught_signals, s)) {		\
2400 	(void)bmake_signal(s, SIG_DFL);			\
2401     }
2402 
2403     DELSIG(SIGINT)
2404     DELSIG(SIGHUP)
2405     DELSIG(SIGQUIT)
2406     DELSIG(SIGTERM)
2407     DELSIG(SIGTSTP)
2408     DELSIG(SIGTTOU)
2409     DELSIG(SIGTTIN)
2410     DELSIG(SIGWINCH)
2411     DELSIG(SIGCONT)
2412 #undef DELSIG
2413     (void)bmake_signal(SIGCHLD, SIG_DFL);
2414 }
2415 
2416 /*-
2417  *-----------------------------------------------------------------------
2418  * JobMatchShell --
2419  *	Find a shell in 'shells' given its name.
2420  *
2421  * Results:
2422  *	A pointer to the Shell structure.
2423  *
2424  * Side Effects:
2425  *	None.
2426  *
2427  *-----------------------------------------------------------------------
2428  */
2429 static Shell *
2430 JobMatchShell(const char *name)
2431 {
2432     Shell	*sh;
2433 
2434     for (sh = shells; sh->name != NULL; sh++) {
2435 	if (strcmp(name, sh->name) == 0)
2436 		return sh;
2437     }
2438     return NULL;
2439 }
2440 
2441 /*-
2442  *-----------------------------------------------------------------------
2443  * Job_ParseShell --
2444  *	Parse a shell specification and set up commandShell, shellPath
2445  *	and shellName appropriately.
2446  *
2447  * Input:
2448  *	line		The shell spec
2449  *
2450  * Results:
2451  *	FAILURE if the specification was incorrect.
2452  *
2453  * Side Effects:
2454  *	commandShell points to a Shell structure (either predefined or
2455  *	created from the shell spec), shellPath is the full path of the
2456  *	shell described by commandShell, while shellName is just the
2457  *	final component of shellPath.
2458  *
2459  * Notes:
2460  *	A shell specification consists of a .SHELL target, with dependency
2461  *	operator, followed by a series of blank-separated words. Double
2462  *	quotes can be used to use blanks in words. A backslash escapes
2463  *	anything (most notably a double-quote and a space) and
2464  *	provides the functionality it does in C. Each word consists of
2465  *	keyword and value separated by an equal sign. There should be no
2466  *	unnecessary spaces in the word. The keywords are as follows:
2467  *	    name  	    Name of shell.
2468  *	    path  	    Location of shell.
2469  *	    quiet 	    Command to turn off echoing.
2470  *	    echo  	    Command to turn echoing on
2471  *	    filter	    Result of turning off echoing that shouldn't be
2472  *	    	  	    printed.
2473  *	    echoFlag	    Flag to turn echoing on at the start
2474  *	    errFlag	    Flag to turn error checking on at the start
2475  *	    hasErrCtl	    True if shell has error checking control
2476  *	    newline	    String literal to represent a newline char
2477  *	    check 	    Command to turn on error checking if hasErrCtl
2478  *	    	  	    is TRUE or template of command to echo a command
2479  *	    	  	    for which error checking is off if hasErrCtl is
2480  *	    	  	    FALSE.
2481  *	    ignore	    Command to turn off error checking if hasErrCtl
2482  *	    	  	    is TRUE or template of command to execute a
2483  *	    	  	    command so as to ignore any errors it returns if
2484  *	    	  	    hasErrCtl is FALSE.
2485  *
2486  *-----------------------------------------------------------------------
2487  */
2488 ReturnStatus
2489 Job_ParseShell(char *line)
2490 {
2491     char	**words;
2492     char	**argv;
2493     int		argc;
2494     char	*path;
2495     Shell	newShell;
2496     Boolean	fullSpec = FALSE;
2497     Shell	*sh;
2498 
2499     while (isspace((unsigned char)*line)) {
2500 	line++;
2501     }
2502 
2503     free(UNCONST(shellArgv));
2504 
2505     memset(&newShell, 0, sizeof(newShell));
2506 
2507     /*
2508      * Parse the specification by keyword
2509      */
2510     words = brk_string(line, &argc, TRUE, &path);
2511     if (words == NULL) {
2512 	Error("Unterminated quoted string [%s]", line);
2513 	return FAILURE;
2514     }
2515     shellArgv = path;
2516 
2517     for (path = NULL, argv = words; argc != 0; argc--, argv++) {
2518 	    if (strncmp(*argv, "path=", 5) == 0) {
2519 		path = &argv[0][5];
2520 	    } else if (strncmp(*argv, "name=", 5) == 0) {
2521 		newShell.name = &argv[0][5];
2522 	    } else {
2523 		if (strncmp(*argv, "quiet=", 6) == 0) {
2524 		    newShell.echoOff = &argv[0][6];
2525 		} else if (strncmp(*argv, "echo=", 5) == 0) {
2526 		    newShell.echoOn = &argv[0][5];
2527 		} else if (strncmp(*argv, "filter=", 7) == 0) {
2528 		    newShell.noPrint = &argv[0][7];
2529 		    newShell.noPLen = strlen(newShell.noPrint);
2530 		} else if (strncmp(*argv, "echoFlag=", 9) == 0) {
2531 		    newShell.echo = &argv[0][9];
2532 		} else if (strncmp(*argv, "errFlag=", 8) == 0) {
2533 		    newShell.exit = &argv[0][8];
2534 		} else if (strncmp(*argv, "hasErrCtl=", 10) == 0) {
2535 		    char c = argv[0][10];
2536 		    newShell.hasErrCtl = !((c != 'Y') && (c != 'y') &&
2537 					   (c != 'T') && (c != 't'));
2538 		} else if (strncmp(*argv, "newline=", 8) == 0) {
2539 		    newShell.newline = &argv[0][8];
2540 		} else if (strncmp(*argv, "check=", 6) == 0) {
2541 		    newShell.errCheck = &argv[0][6];
2542 		} else if (strncmp(*argv, "ignore=", 7) == 0) {
2543 		    newShell.ignErr = &argv[0][7];
2544 		} else if (strncmp(*argv, "errout=", 7) == 0) {
2545 		    newShell.errOut = &argv[0][7];
2546 		} else if (strncmp(*argv, "comment=", 8) == 0) {
2547 		    newShell.commentChar = argv[0][8];
2548 		} else {
2549 		    Parse_Error(PARSE_FATAL, "Unknown keyword \"%s\"",
2550 				*argv);
2551 		    free(words);
2552 		    return FAILURE;
2553 		}
2554 		fullSpec = TRUE;
2555 	    }
2556     }
2557 
2558     if (path == NULL) {
2559 	/*
2560 	 * If no path was given, the user wants one of the pre-defined shells,
2561 	 * yes? So we find the one s/he wants with the help of JobMatchShell
2562 	 * and set things up the right way. shellPath will be set up by
2563 	 * Shell_Init.
2564 	 */
2565 	if (newShell.name == NULL) {
2566 	    Parse_Error(PARSE_FATAL, "Neither path nor name specified");
2567 	    free(words);
2568 	    return FAILURE;
2569 	} else {
2570 	    if ((sh = JobMatchShell(newShell.name)) == NULL) {
2571 		    Parse_Error(PARSE_WARNING, "%s: No matching shell",
2572 				newShell.name);
2573 		    free(words);
2574 		    return FAILURE;
2575 	    }
2576 	    commandShell = sh;
2577 	    shellName = newShell.name;
2578 	    if (shellPath) {
2579 		/* Shell_Init has already been called!  Do it again. */
2580 		free(UNCONST(shellPath));
2581 		shellPath = NULL;
2582 		Shell_Init();
2583 	    }
2584 	}
2585     } else {
2586 	/*
2587 	 * The user provided a path. If s/he gave nothing else (fullSpec is
2588 	 * FALSE), try and find a matching shell in the ones we know of.
2589 	 * Else we just take the specification at its word and copy it
2590 	 * to a new location. In either case, we need to record the
2591 	 * path the user gave for the shell.
2592 	 */
2593 	shellPath = path;
2594 	path = strrchr(path, '/');
2595 	if (path == NULL) {
2596 	    path = UNCONST(shellPath);
2597 	} else {
2598 	    path += 1;
2599 	}
2600 	if (newShell.name != NULL) {
2601 	    shellName = newShell.name;
2602 	} else {
2603 	    shellName = path;
2604 	}
2605 	if (!fullSpec) {
2606 	    if ((sh = JobMatchShell(shellName)) == NULL) {
2607 		    Parse_Error(PARSE_WARNING, "%s: No matching shell",
2608 				shellName);
2609 		    free(words);
2610 		    return FAILURE;
2611 	    }
2612 	    commandShell = sh;
2613 	} else {
2614 	    commandShell = bmake_malloc(sizeof(Shell));
2615 	    *commandShell = newShell;
2616 	}
2617 	/* this will take care of shellErrFlag */
2618 	Shell_Init();
2619     }
2620 
2621     if (commandShell->echoOn && commandShell->echoOff) {
2622 	commandShell->hasEchoCtl = TRUE;
2623     }
2624 
2625     if (!commandShell->hasErrCtl) {
2626 	if (commandShell->errCheck == NULL) {
2627 	    commandShell->errCheck = "";
2628 	}
2629 	if (commandShell->ignErr == NULL) {
2630 	    commandShell->ignErr = "%s\n";
2631 	}
2632     }
2633 
2634     /*
2635      * Do not free up the words themselves, since they might be in use by the
2636      * shell specification.
2637      */
2638     free(words);
2639     return SUCCESS;
2640 }
2641 
2642 /*-
2643  *-----------------------------------------------------------------------
2644  * JobInterrupt --
2645  *	Handle the receipt of an interrupt.
2646  *
2647  * Input:
2648  *	runINTERRUPT	Non-zero if commands for the .INTERRUPT target
2649  *			should be executed
2650  *	signo		signal received
2651  *
2652  * Results:
2653  *	None
2654  *
2655  * Side Effects:
2656  *	All children are killed. Another job will be started if the
2657  *	.INTERRUPT target was given.
2658  *-----------------------------------------------------------------------
2659  */
2660 static void
2661 JobInterrupt(int runINTERRUPT, int signo)
2662 {
2663     Job		*job;		/* job descriptor in that element */
2664     GNode	*interrupt;	/* the node describing the .INTERRUPT target */
2665     sigset_t	mask;
2666     GNode	*gn;
2667 
2668     aborting = ABORT_INTERRUPT;
2669 
2670     JobSigLock(&mask);
2671 
2672     for (job = job_table; job < job_table_end; job++) {
2673 	if (job->job_state != JOB_ST_RUNNING)
2674 	    continue;
2675 
2676 	gn = job->node;
2677 
2678 	JobDeleteTarget(gn);
2679 	if (job->pid) {
2680 	    if (DEBUG(JOB)) {
2681 		(void)fprintf(debug_file,
2682 			   "JobInterrupt passing signal %d to child %d.\n",
2683 			   signo, job->pid);
2684 	    }
2685 	    KILLPG(job->pid, signo);
2686 	}
2687     }
2688 
2689     JobSigUnlock(&mask);
2690 
2691     if (runINTERRUPT && !touchFlag) {
2692 	interrupt = Targ_FindNode(".INTERRUPT", TARG_NOCREATE);
2693 	if (interrupt != NULL) {
2694 	    ignoreErrors = FALSE;
2695 	    JobRun(interrupt);
2696 	}
2697     }
2698     Trace_Log(MAKEINTR, 0);
2699     exit(signo);
2700 }
2701 
2702 /*
2703  *-----------------------------------------------------------------------
2704  * Job_Finish --
2705  *	Do final processing such as the running of the commands
2706  *	attached to the .END target.
2707  *
2708  * Results:
2709  *	Number of errors reported.
2710  *
2711  * Side Effects:
2712  *	None.
2713  *-----------------------------------------------------------------------
2714  */
2715 int
2716 Job_Finish(void)
2717 {
2718     if (postCommands != NULL &&
2719 	(!Lst_IsEmpty(postCommands->commands) ||
2720 	 !Lst_IsEmpty(postCommands->children))) {
2721 	if (errors) {
2722 	    Error("Errors reported so .END ignored");
2723 	} else {
2724 	    JobRun(postCommands);
2725 	}
2726     }
2727     return errors;
2728 }
2729 
2730 /*-
2731  *-----------------------------------------------------------------------
2732  * Job_End --
2733  *	Cleanup any memory used by the jobs module
2734  *
2735  * Results:
2736  *	None.
2737  *
2738  * Side Effects:
2739  *	Memory is freed
2740  *-----------------------------------------------------------------------
2741  */
2742 void
2743 Job_End(void)
2744 {
2745 #ifdef CLEANUP
2746     free(shellArgv);
2747 #endif
2748 }
2749 
2750 /*-
2751  *-----------------------------------------------------------------------
2752  * Job_Wait --
2753  *	Waits for all running jobs to finish and returns. Sets 'aborting'
2754  *	to ABORT_WAIT to prevent other jobs from starting.
2755  *
2756  * Results:
2757  *	None.
2758  *
2759  * Side Effects:
2760  *	Currently running jobs finish.
2761  *
2762  *-----------------------------------------------------------------------
2763  */
2764 void
2765 Job_Wait(void)
2766 {
2767     aborting = ABORT_WAIT;
2768     while (jobTokensRunning != 0) {
2769 	Job_CatchOutput();
2770     }
2771     aborting = 0;
2772 }
2773 
2774 /*-
2775  *-----------------------------------------------------------------------
2776  * Job_AbortAll --
2777  *	Abort all currently running jobs without handling output or anything.
2778  *	This function is to be called only in the event of a major
2779  *	error. Most definitely NOT to be called from JobInterrupt.
2780  *
2781  * Results:
2782  *	None
2783  *
2784  * Side Effects:
2785  *	All children are killed, not just the firstborn
2786  *-----------------------------------------------------------------------
2787  */
2788 void
2789 Job_AbortAll(void)
2790 {
2791     Job		*job;	/* the job descriptor in that element */
2792     WAIT_T	foo;
2793 
2794     aborting = ABORT_ERROR;
2795 
2796     if (jobTokensRunning) {
2797 	for (job = job_table; job < job_table_end; job++) {
2798 	    if (job->job_state != JOB_ST_RUNNING)
2799 		continue;
2800 	    /*
2801 	     * kill the child process with increasingly drastic signals to make
2802 	     * darn sure it's dead.
2803 	     */
2804 	    KILLPG(job->pid, SIGINT);
2805 	    KILLPG(job->pid, SIGKILL);
2806 	}
2807     }
2808 
2809     /*
2810      * Catch as many children as want to report in at first, then give up
2811      */
2812     while (waitpid((pid_t) -1, &foo, WNOHANG) > 0)
2813 	continue;
2814 }
2815 
2816 
2817 /*-
2818  *-----------------------------------------------------------------------
2819  * JobRestartJobs --
2820  *	Tries to restart stopped jobs if there are slots available.
2821  *	Called in process context in response to a SIGCONT.
2822  *
2823  * Results:
2824  *	None.
2825  *
2826  * Side Effects:
2827  *	Resumes jobs.
2828  *
2829  *-----------------------------------------------------------------------
2830  */
2831 static void
2832 JobRestartJobs(void)
2833 {
2834     Job *job;
2835 
2836     for (job = job_table; job < job_table_end; job++) {
2837 	if (job->job_state == JOB_ST_RUNNING &&
2838 		(make_suspended || job->job_suspended)) {
2839 	    if (DEBUG(JOB)) {
2840 		(void)fprintf(debug_file, "Restarting stopped job pid %d.\n",
2841 			job->pid);
2842 	    }
2843 	    if (job->job_suspended) {
2844 		    (void)printf("*** [%s] Continued\n", job->node->name);
2845 		    (void)fflush(stdout);
2846 	    }
2847 	    job->job_suspended = 0;
2848 	    if (KILLPG(job->pid, SIGCONT) != 0 && DEBUG(JOB)) {
2849 		fprintf(debug_file, "Failed to send SIGCONT to %d\n", job->pid);
2850 	    }
2851 	}
2852 	if (job->job_state == JOB_ST_FINISHED)
2853 	    /* Job exit deferred after calling waitpid() in a signal handler */
2854 	    JobFinish(job, job->exit_status);
2855     }
2856     make_suspended = 0;
2857 }
2858 
2859 static void
2860 watchfd(Job *job)
2861 {
2862     if (job->inPollfd != NULL)
2863 	Punt("Watching watched job");
2864 
2865     fds[nfds].fd = job->inPipe;
2866     fds[nfds].events = POLLIN;
2867     jobfds[nfds] = job;
2868     job->inPollfd = &fds[nfds];
2869     nfds++;
2870 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
2871     if (useMeta) {
2872 	fds[nfds].fd = meta_job_fd(job);
2873 	fds[nfds].events = fds[nfds].fd == -1 ? 0 : POLLIN;
2874 	jobfds[nfds] = job;
2875 	nfds++;
2876     }
2877 #endif
2878 }
2879 
2880 static void
2881 clearfd(Job *job)
2882 {
2883     int i;
2884     if (job->inPollfd == NULL)
2885 	Punt("Unwatching unwatched job");
2886     i = job->inPollfd - fds;
2887     nfds--;
2888 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
2889     if (useMeta) {
2890 	/*
2891 	 * Sanity check: there should be two fds per job, so the job's
2892 	 * pollfd number should be even.
2893 	 */
2894 	assert(nfds_per_job() == 2);
2895 	if (i % 2)
2896 	    Punt("odd-numbered fd with meta");
2897 	nfds--;
2898     }
2899 #endif
2900     /*
2901      * Move last job in table into hole made by dead job.
2902      */
2903     if (nfds != i) {
2904 	fds[i] = fds[nfds];
2905 	jobfds[i] = jobfds[nfds];
2906 	jobfds[i]->inPollfd = &fds[i];
2907 #if defined(USE_FILEMON) && !defined(USE_FILEMON_DEV)
2908 	if (useMeta) {
2909 	    fds[i + 1] = fds[nfds + 1];
2910 	    jobfds[i + 1] = jobfds[nfds + 1];
2911 	}
2912 #endif
2913     }
2914     job->inPollfd = NULL;
2915 }
2916 
2917 static int
2918 readyfd(Job *job)
2919 {
2920     if (job->inPollfd == NULL)
2921 	Punt("Polling unwatched job");
2922     return (job->inPollfd->revents & POLLIN) != 0;
2923 }
2924 
2925 /*-
2926  *-----------------------------------------------------------------------
2927  * JobTokenAdd --
2928  *	Put a token into the job pipe so that some make process can start
2929  *	another job.
2930  *
2931  * Side Effects:
2932  *	Allows more build jobs to be spawned somewhere.
2933  *
2934  *-----------------------------------------------------------------------
2935  */
2936 
2937 static void
2938 JobTokenAdd(void)
2939 {
2940     char tok = JOB_TOKENS[aborting], tok1;
2941 
2942     if (!Job_error_token && aborting == ABORT_ERROR) {
2943 	if (jobTokensRunning == 0)
2944 	    return;
2945 	tok = '+';			/* no error token */
2946     }
2947 
2948     /* If we are depositing an error token flush everything else */
2949     while (tok != '+' && read(tokenWaitJob.inPipe, &tok1, 1) == 1)
2950 	continue;
2951 
2952     if (DEBUG(JOB))
2953 	fprintf(debug_file, "(%d) aborting %d, deposit token %c\n",
2954 	    getpid(), aborting, tok);
2955     while (write(tokenWaitJob.outPipe, &tok, 1) == -1 && errno == EAGAIN)
2956 	continue;
2957 }
2958 
2959 /*-
2960  *-----------------------------------------------------------------------
2961  * Job_ServerStartTokenAdd --
2962  *	Prep the job token pipe in the root make process.
2963  *
2964  *-----------------------------------------------------------------------
2965  */
2966 
2967 void
2968 Job_ServerStart(int max_tokens, int jp_0, int jp_1)
2969 {
2970     int i;
2971     char jobarg[64];
2972 
2973     if (jp_0 >= 0 && jp_1 >= 0) {
2974 	/* Pipe passed in from parent */
2975 	tokenWaitJob.inPipe = jp_0;
2976 	tokenWaitJob.outPipe = jp_1;
2977 	(void)fcntl(jp_0, F_SETFD, FD_CLOEXEC);
2978 	(void)fcntl(jp_1, F_SETFD, FD_CLOEXEC);
2979 	return;
2980     }
2981 
2982     JobCreatePipe(&tokenWaitJob, 15);
2983 
2984     snprintf(jobarg, sizeof(jobarg), "%d,%d",
2985 	    tokenWaitJob.inPipe, tokenWaitJob.outPipe);
2986 
2987     Var_Append(MAKEFLAGS, "-J", VAR_GLOBAL);
2988     Var_Append(MAKEFLAGS, jobarg, VAR_GLOBAL);
2989 
2990     /*
2991      * Preload the job pipe with one token per job, save the one
2992      * "extra" token for the primary job.
2993      *
2994      * XXX should clip maxJobs against PIPE_BUF -- if max_tokens is
2995      * larger than the write buffer size of the pipe, we will
2996      * deadlock here.
2997      */
2998     for (i = 1; i < max_tokens; i++)
2999 	JobTokenAdd();
3000 }
3001 
3002 /*-
3003  *-----------------------------------------------------------------------
3004  * Job_TokenReturn --
3005  *	Return a withdrawn token to the pool.
3006  *
3007  *-----------------------------------------------------------------------
3008  */
3009 
3010 void
3011 Job_TokenReturn(void)
3012 {
3013     jobTokensRunning--;
3014     if (jobTokensRunning < 0)
3015 	Punt("token botch");
3016     if (jobTokensRunning || JOB_TOKENS[aborting] != '+')
3017 	JobTokenAdd();
3018 }
3019 
3020 /*-
3021  *-----------------------------------------------------------------------
3022  * Job_TokenWithdraw --
3023  *	Attempt to withdraw a token from the pool.
3024  *
3025  * Results:
3026  *	Returns TRUE if a token was withdrawn, and FALSE if the pool
3027  *	is currently empty.
3028  *
3029  * Side Effects:
3030  * 	If pool is empty, set wantToken so that we wake up
3031  *	when a token is released.
3032  *
3033  *-----------------------------------------------------------------------
3034  */
3035 
3036 
3037 Boolean
3038 Job_TokenWithdraw(void)
3039 {
3040     char tok, tok1;
3041     int count;
3042 
3043     wantToken = 0;
3044     if (DEBUG(JOB))
3045 	fprintf(debug_file, "Job_TokenWithdraw(%d): aborting %d, running %d\n",
3046 		getpid(), aborting, jobTokensRunning);
3047 
3048     if (aborting || (jobTokensRunning >= maxJobs))
3049 	return FALSE;
3050 
3051     count = read(tokenWaitJob.inPipe, &tok, 1);
3052     if (count == 0)
3053 	Fatal("eof on job pipe!");
3054     if (count < 0 && jobTokensRunning != 0) {
3055 	if (errno != EAGAIN) {
3056 	    Fatal("job pipe read: %s", strerror(errno));
3057 	}
3058 	if (DEBUG(JOB))
3059 	    fprintf(debug_file, "(%d) blocked for token\n", getpid());
3060 	return FALSE;
3061     }
3062 
3063     if (count == 1 && tok != '+') {
3064 	/* make being abvorted - remove any other job tokens */
3065 	if (DEBUG(JOB))
3066 	    fprintf(debug_file, "(%d) aborted by token %c\n", getpid(), tok);
3067 	while (read(tokenWaitJob.inPipe, &tok1, 1) == 1)
3068 	    continue;
3069 	/* And put the stopper back */
3070 	while (write(tokenWaitJob.outPipe, &tok, 1) == -1 && errno == EAGAIN)
3071 	    continue;
3072 	if (dieQuietly(NULL, 1))
3073 	    exit(2);
3074 	Fatal("A failure has been detected in another branch of the parallel make");
3075     }
3076 
3077     if (count == 1 && jobTokensRunning == 0)
3078 	/* We didn't want the token really */
3079 	while (write(tokenWaitJob.outPipe, &tok, 1) == -1 && errno == EAGAIN)
3080 	    continue;
3081 
3082     jobTokensRunning++;
3083     if (DEBUG(JOB))
3084 	fprintf(debug_file, "(%d) withdrew token\n", getpid());
3085     return TRUE;
3086 }
3087 
3088 /*-
3089  *-----------------------------------------------------------------------
3090  * Job_RunTarget --
3091  *	Run the named target if found. If a filename is specified, then
3092  *	set that to the sources.
3093  *
3094  * Results:
3095  *	None
3096  *
3097  * Side Effects:
3098  * 	exits if the target fails.
3099  *
3100  *-----------------------------------------------------------------------
3101  */
3102 Boolean
3103 Job_RunTarget(const char *target, const char *fname) {
3104     GNode *gn = Targ_FindNode(target, TARG_NOCREATE);
3105 
3106     if (gn == NULL)
3107 	return FALSE;
3108 
3109     if (fname)
3110 	Var_Set(ALLSRC, fname, gn);
3111 
3112     JobRun(gn);
3113     if (gn->made == ERROR) {
3114 	PrintOnError(gn, "\n\nStop.");
3115 	exit(1);
3116     }
3117     return TRUE;
3118 }
3119 
3120 #ifdef USE_SELECT
3121 int
3122 emul_poll(struct pollfd *fd, int nfd, int timeout)
3123 {
3124     fd_set rfds, wfds;
3125     int i, maxfd, nselect, npoll;
3126     struct timeval tv, *tvp;
3127     long usecs;
3128 
3129     FD_ZERO(&rfds);
3130     FD_ZERO(&wfds);
3131 
3132     maxfd = -1;
3133     for (i = 0; i < nfd; i++) {
3134 	fd[i].revents = 0;
3135 
3136 	if (fd[i].events & POLLIN)
3137 	    FD_SET(fd[i].fd, &rfds);
3138 
3139 	if (fd[i].events & POLLOUT)
3140 	    FD_SET(fd[i].fd, &wfds);
3141 
3142 	if (fd[i].fd > maxfd)
3143 	    maxfd = fd[i].fd;
3144     }
3145 
3146     if (maxfd >= FD_SETSIZE) {
3147 	Punt("Ran out of fd_set slots; "
3148 	     "recompile with a larger FD_SETSIZE.");
3149     }
3150 
3151     if (timeout < 0) {
3152 	tvp = NULL;
3153     } else {
3154 	usecs = timeout * 1000;
3155 	tv.tv_sec = usecs / 1000000;
3156 	tv.tv_usec = usecs % 1000000;
3157         tvp = &tv;
3158     }
3159 
3160     nselect = select(maxfd + 1, &rfds, &wfds, 0, tvp);
3161 
3162     if (nselect <= 0)
3163 	return nselect;
3164 
3165     npoll = 0;
3166     for (i = 0; i < nfd; i++) {
3167 	if (FD_ISSET(fd[i].fd, &rfds))
3168 	    fd[i].revents |= POLLIN;
3169 
3170 	if (FD_ISSET(fd[i].fd, &wfds))
3171 	    fd[i].revents |= POLLOUT;
3172 
3173 	if (fd[i].revents)
3174 	    npoll++;
3175     }
3176 
3177     return npoll;
3178 }
3179 #endif /* USE_SELECT */
3180