xref: /freebsd/contrib/tcsh/sh.c (revision 817420dc8eac7df799c78f5309b75092b7f7cd40)
1 /* $Header: /src/pub/tcsh/sh.c,v 3.90 2000/01/14 22:57:27 christos Exp $ */
2 /*
3  * sh.c: Main shell routines
4  */
5 /*-
6  * Copyright (c) 1980, 1991 The Regents of the University of California.
7  * All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. All advertising materials mentioning features or use of this software
18  *    must display the following acknowledgement:
19  *	This product includes software developed by the University of
20  *	California, Berkeley and its contributors.
21  * 4. Neither the name of the University nor the names of its contributors
22  *    may be used to endorse or promote products derived from this software
23  *    without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37 #define EXTERN	/* Intern */
38 #include "sh.h"
39 
40 #ifndef lint
41 char    copyright[] =
42 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\
43  All rights reserved.\n";
44 #endif /* not lint */
45 
46 RCSID("$Id: sh.c,v 3.90 2000/01/14 22:57:27 christos Exp $")
47 
48 #include "tc.h"
49 #include "ed.h"
50 #include "tw.h"
51 
52 extern bool MapsAreInited;
53 extern bool NLSMapsAreInited;
54 extern bool NoNLSRebind;
55 
56 /*
57  * C Shell
58  *
59  * Bill Joy, UC Berkeley, California, USA
60  * October 1978, May 1980
61  *
62  * Jim Kulp, IIASA, Laxenburg, Austria
63  * April 1980
64  *
65  * Filename recognition added:
66  * Ken Greer, Ind. Consultant, Palo Alto CA
67  * October 1983.
68  *
69  * Karl Kleinpaste, Computer Consoles, Inc.
70  * Added precmd, periodic/tperiod, prompt changes,
71  * directory stack hack, and login watch.
72  * Sometime March 1983 - Feb 1984.
73  *
74  * Added scheduled commands, including the "sched" command,
75  * plus the call to sched_run near the precmd et al
76  * routines.
77  * Upgraded scheduled events for running events while
78  * sitting idle at command input.
79  *
80  * Paul Placeway, Ohio State
81  * added stuff for running with twenex/inputl  9 Oct 1984.
82  *
83  * ported to Apple Unix (TM) (OREO)  26 -- 29 Jun 1987
84  */
85 
86 jmp_buf_t reslab INIT_ZERO_STRUCT;
87 
88 static const char tcshstr[] = "tcsh";
89 #ifdef WINNT
90 static const char tcshstr_nt[] = "tcsh.exe";
91 #endif /* WINNT */
92 
93 signalfun_t parintr = 0;	/* Parents interrupt catch */
94 signalfun_t parterm = 0;	/* Parents terminate catch */
95 
96 #ifdef TESLA
97 int do_logout = 0;
98 #endif /* TESLA */
99 
100 
101 bool    use_fork = 0;		/* use fork() instead of vfork()? */
102 
103 /*
104  * Magic pointer values. Used to specify other invalid conditions aside
105  * from null.
106  */
107 static Char	INVCHAR;
108 Char    *INVPTR = &INVCHAR;
109 Char    **INVPPTR = &INVPTR;
110 
111 static int     nofile = 0;
112 static bool    reenter = 0;
113 static bool    nverbose = 0;
114 static bool    nexececho = 0;
115 static bool    quitit = 0;
116 static bool    rdirs = 0;
117 bool    fast = 0;
118 static bool    batch = 0;
119 static bool    mflag = 0;
120 static bool    prompt = 1;
121 static int     enterhist = 0;
122 bool    tellwhat = 0;
123 time_t  t_period;
124 Char  *ffile = NULL;
125 bool	dolzero = 0;
126 int	insource = 0;
127 static time_t  chktim;		/* Time mail last checked */
128 char *progname;
129 int tcsh;
130 extern char **environ;
131 
132 /*
133  * This preserves the input state of the shell. It is used by
134  * st_save and st_restore to manupulate shell state.
135  */
136 struct saved_state {
137     int		  insource;
138     int		  SHIN;
139     int		  intty;
140     struct whyle *whyles;
141     Char 	 *gointr;
142     Char 	 *arginp;
143     Char	 *evalp;
144     Char	**evalvec;
145     Char	 *alvecp;
146     Char	**alvec;
147     int		  onelflg;
148     bool	  enterhist;
149     Char	**argv;
150     Char	  HIST;
151     bool	  cantell;
152     struct Bin	  B;
153     /* These keep signal state and setjump state */
154 #ifdef BSDSIGS
155     sigmask_t	  mask;
156 #endif
157     jmp_buf_t	  oldexit;
158     int		  reenter;
159 };
160 
161 static	int		  srccat	__P((Char *, Char *));
162 static	int		  srcfile	__P((char *, bool, int, Char **));
163 static	sigret_t	  phup		__P((int));
164 static	void		  srcunit	__P((int, bool, int, Char **));
165 static	void		  mailchk	__P((void));
166 #ifndef _PATH_DEFPATH
167 static	Char	 	**defaultpath	__P((void));
168 #endif
169 static	void		  record	__P((void));
170 static	void		  st_save	__P((struct saved_state *, int, int,
171 					     Char **, Char **));
172 static	void		  st_restore	__P((struct saved_state *, Char **));
173 
174 	int		  main		__P((int, char **));
175 
176 int
177 main(argc, argv)
178     int     argc;
179     char  **argv;
180 {
181     register Char *cp;
182 #ifdef AUTOLOGOUT
183     register Char *cp2;
184 #endif
185     register char *tcp, *ttyn;
186     register int f;
187     register char **tempv;
188 
189 #ifdef BSDSIGS
190     sigvec_t osv;
191 #endif /* BSDSIGS */
192 
193 #ifdef WINNT
194     nt_init();
195 #endif /* WINNT */
196 #if defined(NLS_CATALOGS) && defined(LC_MESSAGES)
197     (void) setlocale(LC_MESSAGES, "");
198 #endif /* NLS_CATALOGS && LC_MESSAGES */
199 
200 #ifdef NLS
201 # ifdef LC_CTYPE
202     (void) setlocale(LC_CTYPE, ""); /* for iscntrl */
203 # endif /* LC_CTYPE */
204 #endif /* NLS */
205 
206     nlsinit();
207 
208 #ifdef MALLOC_TRACE
209      mal_setstatsfile(fdopen(dup2(open("/tmp/tcsh.trace",
210 				       O_WRONLY|O_CREAT, 0666), 25), "w"));
211      mal_trace(1);
212 #endif /* MALLOC_TRACE */
213 
214 #if !(defined(BSDTIMES) || defined(_SEQUENT_)) && defined(POSIX)
215 # ifdef _SC_CLK_TCK
216     clk_tck = (clock_t) sysconf(_SC_CLK_TCK);
217 # else /* ! _SC_CLK_TCK */
218 #  ifdef CLK_TCK
219     clk_tck = CLK_TCK;
220 #  else /* !CLK_TCK */
221     clk_tck = HZ;
222 #  endif /* CLK_TCK */
223 # endif /* _SC_CLK_TCK */
224 #endif /* !BSDTIMES && POSIX */
225 
226     settimes();			/* Immed. estab. timing base */
227 #ifdef TESLA
228     do_logout = 0;
229 #endif /* TESLA */
230 
231     /*
232      * Make sure we have 0, 1, 2 open
233      * Otherwise `` jobs will not work... (From knaff@poly.polytechnique.fr)
234      */
235     {
236 	do
237 	    if ((f = open(_PATH_DEVNULL, O_RDONLY)) == -1 &&
238 		(f = open("/", O_RDONLY)) == -1)
239 		exit(1);
240 	while (f < 3);
241 	(void) close(f);
242     }
243 
244     osinit();			/* Os dependent initialization */
245 
246 
247     {
248 	char *t;
249 
250 	t = strrchr(argv[0], '/');
251 #ifdef WINNT
252 	{
253 	    char *s = strrchr(argv[0], '\\');
254 	    if (s)
255 		t = s;
256 	}
257 #endif /* WINNT */
258 	t = t ? t + 1 : argv[0];
259 	if (*t == '-') t++;
260 	progname = strsave((t && *t) ? t : tcshstr);    /* never want a null */
261 	tcsh = strcmp(progname, tcshstr) == 0;
262     }
263 
264     /*
265      * Initialize non constant strings
266      */
267 #ifdef _PATH_BSHELL
268     STR_BSHELL = SAVE(_PATH_BSHELL);
269 #endif
270 #ifdef _PATH_TCSHELL
271     STR_SHELLPATH = SAVE(_PATH_TCSHELL);
272 #else
273 # ifdef _PATH_CSHELL
274     STR_SHELLPATH = SAVE(_PATH_CSHELL);
275 # endif
276 #endif
277     STR_environ = blk2short(environ);
278     environ = short2blk(STR_environ);	/* So that we can free it */
279     STR_WORD_CHARS = SAVE(WORD_CHARS);
280 
281     HIST = '!';
282     HISTSUB = '^';
283     PRCH = '>';
284     PRCHROOT = '#';
285     word_chars = STR_WORD_CHARS;
286     bslash_quote = 0;		/* PWP: do tcsh-style backslash quoting? */
287 
288     /* Default history size to 100 */
289     set(STRhistory, SAVE("100"), VAR_READWRITE);
290 
291     tempv = argv;
292     ffile = SAVE(tempv[0]);
293     dolzero = 0;
294     if (eq(ffile, STRaout))	/* A.out's are quittable */
295 	quitit = 1;
296     uid = getuid();
297     gid = getgid();
298     euid = geteuid();
299     egid = getegid();
300 #if defined(OREO) || defined(DT_SUPPORT)
301     /*
302      * We are a login shell if: 1. we were invoked as -<something> with
303      * optional arguments 2. or we were invoked only with the -l flag
304      */
305     loginsh = (**tempv == '-') || (argc == 2 &&
306 				   tempv[1][0] == '-' && tempv[1][1] == 'l' &&
307 						tempv[1][2] == '\0');
308 #else
309     /*
310      * We are a login shell if: 1. we were invoked as -<something> and we had
311      * no arguments 2. or we were invoked only with the -l flag
312      */
313     loginsh = (**tempv == '-' && argc == 1) || (argc == 2 &&
314 				   tempv[1][0] == '-' && tempv[1][1] == 'l' &&
315 						tempv[1][2] == '\0');
316 #endif
317 
318 #ifdef _VMS_POSIX
319     /* No better way to find if we are a login shell */
320     if (!loginsh) {
321 	loginsh = (argc == 1 && getppid() == 1);
322 	**tempv = '-';	/* Avoid giving VMS an acidic stomach */
323     }
324 #endif /* _VMS_POSIX */
325 
326     if (loginsh && **tempv != '-') {
327 	/*
328 	 * Mangle the argv space
329 	 */
330 	tempv[1][0] = '\0';
331 	tempv[1][1] = '\0';
332 	tempv[1] = NULL;
333 	for (tcp = *tempv; *tcp++;)
334 	     continue;
335 	for (tcp--; tcp >= *tempv; tcp--)
336 	    tcp[1] = tcp[0];
337 	*++tcp = '-';
338 	argc--;
339     }
340     if (loginsh) {
341 	(void) time(&chktim);
342 	set(STRloginsh, Strsave(STRNULL), VAR_READWRITE);
343     }
344 
345     AsciiOnly = 1;
346     NoNLSRebind = getenv("NOREBIND") != NULL;
347 #ifdef NLS
348 # ifdef SETLOCALEBUG
349     dont_free = 1;
350 # endif /* SETLOCALEBUG */
351     (void) setlocale(LC_ALL, "");
352 # ifdef LC_COLLATE
353     (void) setlocale(LC_COLLATE, "");
354 # endif
355 # ifdef SETLOCALEBUG
356     dont_free = 0;
357 # endif /* SETLOCALEBUG */
358 # ifdef STRCOLLBUG
359     fix_strcoll_bug();
360 # endif /* STRCOLLBUG */
361 
362     {
363 	int     k;
364 
365 	for (k = 0200; k <= 0377 && !Isprint(k); k++)
366 	    continue;
367 	AsciiOnly = k > 0377;
368     }
369 #else
370     AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL;
371 #endif				/* NLS */
372     if (MapsAreInited && !NLSMapsAreInited)
373 	ed_InitNLSMaps();
374     ResetArrowKeys();
375 
376     /*
377      * Initialize for periodic command intervals. Also, initialize the dummy
378      * tty list for login-watch.
379      */
380     (void) time(&t_period);
381 #ifndef HAVENOUTMP
382     initwatch();
383 #endif /* !HAVENOUTMP */
384 
385 #if defined(alliant)
386     /*
387      * From:  Jim Pace <jdp@research.att.com>
388      * tcsh does not work properly on the alliants through an rlogin session.
389      * The shell generally hangs.  Also, reference to the controlling terminal
390      * does not work ( ie: echo foo > /dev/tty ).
391      *
392      * A security feature was added to rlogind affecting FX/80's Concentrix
393      * from revision 5.5.xx upwards (through 5.7 where this fix was implemented)
394      * This security change also affects the FX/2800 series.
395      * The security change to rlogind requires the process group of an rlogin
396      * session become disassociated with the tty in rlogind.
397      *
398      * The changes needed are:
399      * 1. set the process group
400      * 2. reenable the control terminal
401      */
402      if (loginsh && isatty(SHIN)) {
403 	 ttyn = (char *) ttyname(SHIN);
404 	 (void) close(SHIN);
405 	 SHIN = open(ttyn, O_RDWR);
406 	 shpgrp = getpid();
407 	 (void) ioctl (SHIN, TIOCSPGRP, (ioctl_t) &shpgrp);
408 	 (void) setpgid(0, shpgrp);
409      }
410 #endif /* alliant */
411 
412     /*
413      * Move the descriptors to safe places. The variable didfds is 0 while we
414      * have only FSH* to work with. When didfds is true, we have 0,1,2 and
415      * prefer to use these.
416      */
417     initdesc();
418 
419     /*
420      * Get and set the tty now
421      */
422     if ((ttyn = ttyname(SHIN)) != NULL) {
423 	/*
424 	 * Could use rindex to get rid of other possible path components, but
425 	 * hpux preserves the subdirectory /pty/ when storing the tty name in
426 	 * utmp, so we keep it too.
427 	 */
428 	if (strncmp(ttyn, "/dev/", 5) == 0)
429 	    set(STRtty, cp = SAVE(ttyn + 5), VAR_READWRITE);
430 	else
431 	    set(STRtty, cp = SAVE(ttyn), VAR_READWRITE);
432     }
433     else
434 	set(STRtty, cp = SAVE(""), VAR_READWRITE);
435     /*
436      * Initialize the shell variables. ARGV and PROMPT are initialized later.
437      * STATUS is also munged in several places. CHILD is munged when
438      * forking/waiting
439      */
440 
441     /*
442      * 7-10-87 Paul Placeway autologout should be set ONLY on login shells and
443      * on shells running as root.  Out of these, autologout should NOT be set
444      * for any psudo-terminals (this catches most window systems) and not for
445      * any terminal running X windows.
446      *
447      * At Ohio State, we have had problems with a user having his X session
448      * drop out from under him (on a Sun) because the shell in his master
449      * xterm timed out and exited.
450      *
451      * Really, this should be done with a program external to the shell, that
452      * watches for no activity (and NO running programs, such as dump) on a
453      * terminal for a long peroid of time, and then SIGHUPS the shell on that
454      * terminal.
455      *
456      * bugfix by Rich Salz <rsalz@PINEAPPLE.BBN.COM>: For root rsh things
457      * allways first check to see if loginsh or really root, then do things
458      * with ttyname()
459      *
460      * Also by Jean-Francois Lamy <lamy%ai.toronto.edu@RELAY.CS.NET>: check the
461      * value of cp before using it! ("root can rsh too")
462      *
463      * PWP: keep the nested ifs; the order of the tests matters and a good
464      * (smart) C compiler might re-arange things wrong.
465      */
466 #ifdef AUTOLOGOUT
467 # ifdef convex
468     if (uid == 0) {
469 	/*  root always has a 15 minute autologout  */
470 	set(STRautologout, Strsave(STRrootdefautologout), VAR_READWRITE);
471     }
472     else
473 	if (loginsh)
474 	    /*  users get autologout set to 0  */
475 	    set(STRautologout, Strsave(STR0), VAR_READWRITE);
476 # else /* convex */
477     if (loginsh || (uid == 0)) {
478 	if (*cp) {
479 	    /* only for login shells or root and we must have a tty */
480 	    if ((cp2 = Strrchr(cp, (Char) '/')) != NULL) {
481 		cp = cp2 + 1;
482 	    }
483 	    else
484 		cp2 = cp;
485 	    if (!(((Strncmp(cp2, STRtty, 3) == 0) && Isalpha(cp2[3])) ||
486 		  ((Strncmp(cp, STRpts, 3) == 0) && cp[3] == '/'))) {
487 		if (getenv("DISPLAY") == NULL) {
488 		    /* NOT on X window shells */
489 		    set(STRautologout, Strsave(STRdefautologout),
490 			VAR_READWRITE);
491 		}
492 	    }
493 	}
494     }
495 # endif /* convex */
496 #endif /* AUTOLOGOUT */
497 
498     (void) sigset(SIGALRM, alrmcatch);
499 
500     set(STRstatus, Strsave(STR0), VAR_READWRITE);
501 
502     /*
503      * get and set machine specific envirnment variables
504      */
505     getmachine();
506 
507     fix_version();		/* publish the shell version */
508 
509     /*
510      * Publish the selected echo style
511      */
512 #if ECHO_STYLE == NONE_ECHO
513     set(STRecho_style, Strsave(STRnone), VAR_READWRITE);
514 #endif /* ECHO_STYLE == NONE_ECHO */
515 #if ECHO_STYLE == BSD_ECHO
516     set(STRecho_style, Strsave(STRbsd), VAR_READWRITE);
517 #endif /* ECHO_STYLE == BSD_ECHO */
518 #if ECHO_STYLE == SYSV_ECHO
519     set(STRecho_style, Strsave(STRsysv), VAR_READWRITE);
520 #endif /* ECHO_STYLE == SYSV_ECHO */
521 #if ECHO_STYLE == BOTH_ECHO
522     set(STRecho_style, Strsave(STRboth), VAR_READWRITE);
523 #endif /* ECHO_STYLE == BOTH_ECHO */
524 
525     /*
526      * increment the shell level.
527      */
528     shlvl(1);
529 
530     if ((tcp = getenv("HOME")) != NULL)
531 	cp = quote(SAVE(tcp));
532     else
533 	cp = NULL;
534     if (cp == NULL)
535 	fast = 1;		/* No home -> can't read scripts */
536     else
537 	set(STRhome, cp, VAR_READWRITE);
538     dinit(cp);			/* dinit thinks that HOME == cwd in a login
539 				 * shell */
540     /*
541      * Grab other useful things from the environment. Should we grab
542      * everything??
543      */
544     {
545 	char *cln, *cus, *cgr;
546 	Char    buff[BUFSIZE];
547 	struct passwd *pw;
548 	struct group *gr;
549 
550 
551 #ifdef apollo
552 	int     oid = getoid();
553 
554 	(void) Itoa(oid, buff, 0, 0);
555 	set(STRoid, Strsave(buff), VAR_READWRITE);
556 #endif /* apollo */
557 
558 	(void) Itoa(uid, buff, 0, 0);
559 	set(STRuid, Strsave(buff), VAR_READWRITE);
560 
561 	(void) Itoa(gid, buff, 0, 0);
562 	set(STRgid, Strsave(buff), VAR_READWRITE);
563 
564 	cln = getenv("LOGNAME");
565 	cus = getenv("USER");
566 	if (cus != NULL)
567 	    set(STRuser, quote(SAVE(cus)), VAR_READWRITE);
568 	else if (cln != NULL)
569 	    set(STRuser, quote(SAVE(cln)), VAR_READWRITE);
570 	else if ((pw = getpwuid(uid)) == NULL)
571 	    set(STRuser, SAVE("unknown"), VAR_READWRITE);
572 	else
573 	    set(STRuser, SAVE(pw->pw_name), VAR_READWRITE);
574 	if (cln == NULL)
575 	    tsetenv(STRLOGNAME, varval(STRuser));
576 	if (cus == NULL)
577 	    tsetenv(STRKUSER, varval(STRuser));
578 
579 	cgr = getenv("GROUP");
580 	if (cgr != NULL)
581 	    set(STRgroup, quote(SAVE(cgr)), VAR_READWRITE);
582 	else if ((gr = getgrgid(gid)) == NULL)
583 	    set(STRgroup, SAVE("unknown"), VAR_READWRITE);
584 	else
585 	    set(STRgroup, SAVE(gr->gr_name), VAR_READWRITE);
586 	if (cgr == NULL)
587 	    tsetenv(STRKGROUP, varval(STRgroup));
588     }
589 
590     /*
591      * HOST may be wrong, since rexd transports the entire environment on sun
592      * 3.x Just set it again
593      */
594     {
595 	char    cbuff[MAXHOSTNAMELEN];
596 
597 	if (gethostname(cbuff, sizeof(cbuff)) >= 0) {
598 	    cbuff[sizeof(cbuff) - 1] = '\0';	/* just in case */
599 	    tsetenv(STRHOST, str2short(cbuff));
600 	}
601 	else
602 	    tsetenv(STRHOST, str2short("unknown"));
603     }
604 
605 
606 #ifdef REMOTEHOST
607     /*
608      * Try to determine the remote host we were logged in from.
609      */
610     remotehost();
611 #endif /* REMOTEHOST */
612 
613 #ifdef apollo
614     if ((tcp = getenv("SYSTYPE")) == NULL)
615 	tcp = "bsd4.3";
616     tsetenv(STRSYSTYPE, quote(str2short(tcp)));
617 #endif /* apollo */
618 
619     /*
620      * set editing on by default, unless running under Emacs as an inferior
621      * shell.
622      * We try to do this intelligently. If $TERM is available, then it
623      * should determine if we should edit or not. $TERM is preserved
624      * across rlogin sessions, so we will not get confused if we rlogin
625      * under an emacs shell. Another advantage is that if we run an
626      * xterm under an emacs shell, then the $TERM will be set to
627      * xterm, so we are going to want to edit. Unfortunately emacs
628      * does not restore all the tty modes, so xterm is not very well
629      * set up. But this is not the shell's fault.
630      * Also don't edit if $TERM == wm, for when we're running under an ATK app.
631      * Finally, emacs compiled under terminfo, sets the terminal to dumb,
632      * so disable editing for that too.
633      *
634      * Unfortunately, in some cases the initial $TERM setting is "unknown",
635      * "dumb", or "network" which is then changed in the user's startup files.
636      * We fix this by setting noediting here if $TERM is unknown/dumb and
637      * if noediting is set, we switch on editing if $TERM is changed.
638      */
639     if ((tcp = getenv("TERM")) != NULL) {
640 	set(STRterm, quote(SAVE(tcp)), VAR_READWRITE);
641 	noediting = strcmp(tcp, "unknown") == 0 || strcmp(tcp, "dumb") == 0 ||
642 		    strcmp(tcp, "network") == 0;
643 	editing = strcmp(tcp, "emacs") != 0 && strcmp(tcp, "wm") != 0 &&
644 		  !noediting;
645     }
646     else {
647 	noediting = 0;
648 	editing = ((tcp = getenv("EMACS")) == NULL || strcmp(tcp, "t") != 0);
649     }
650 
651     /*
652      * The 'edit' variable is either set or unset.  It doesn't
653      * need a value.  Making it 'emacs' might be confusing.
654      */
655     if (editing)
656 	set(STRedit, Strsave(STRNULL), VAR_READWRITE);
657 
658 
659     /*
660      * still more mutability: make the complete routine automatically add the
661      * suffix of file names...
662      */
663     set(STRaddsuffix, Strsave(STRNULL), VAR_READWRITE);
664 
665     /*
666      * Re-initialize path if set in environment
667      */
668     if ((tcp = getenv("PATH")) == NULL)
669 #ifdef _PATH_DEFPATH
670 	importpath(str2short(_PATH_DEFPATH));
671 #else /* !_PATH_DEFPATH */
672 	setq(STRpath, defaultpath(), &shvhed, VAR_READWRITE);
673 #endif /* _PATH_DEFPATH */
674     else
675 	/* Importpath() allocates memory for the path, and the
676 	 * returned pointer from SAVE() was discarded, so
677 	 * this was a memory leak.. (sg)
678 	 *
679 	 * importpath(SAVE(tcp));
680 	 */
681 	importpath(str2short(tcp));
682 
683 
684     {
685 	/* If the SHELL environment variable ends with "tcsh", set
686 	 * STRshell to the same path.  This is to facilitate using
687 	 * the executable in environments where the compiled-in
688 	 * default isn't appropriate (sg).
689 	 */
690 
691 	int sh_len = 0;
692 
693 	if ((tcp = getenv("SHELL")) != NULL) {
694 	    sh_len = strlen(tcp);
695 	    if ((sh_len >= 5 && strcmp(tcp + (sh_len - 5), "/tcsh") == 0) ||
696 	        (!tcsh && sh_len >= 4 && strcmp(tcp + (sh_len - 4), "/csh") == 0))
697 		set(STRshell, quote(SAVE(tcp)), VAR_READWRITE);
698 	    else
699 		sh_len = 0;
700 	}
701 	if (sh_len == 0)
702 	    set(STRshell, Strsave(STR_SHELLPATH), VAR_READWRITE);
703     }
704 
705 #ifdef COLOR_LS_F
706     if ((tcp = getenv("LS_COLORS")) != NULL)
707 	parseLS_COLORS(str2short(tcp));
708 #endif /* COLOR_LS_F */
709 
710     doldol = putn((int) getpid());	/* For $$ */
711 #ifdef WINNT
712     {
713 	char *strtmp1, strtmp2[MAXPATHLEN];
714 	if ((strtmp1 = getenv("TMP")) != NULL)
715 	    wsprintf(strtmp2, "%s/%s", strtmp1, "sh");
716 	shtemp = Strspl(SAVE(strtmp2), doldol);	/* For << */
717     }
718 #else /* !WINNT */
719     shtemp = Strspl(STRtmpsh, doldol);	/* For << */
720 #endif /* WINNT */
721 
722     /*
723      * Record the interrupt states from the parent process. If the parent is
724      * non-interruptible our hand must be forced or we (and our children) won't
725      * be either. Our children inherit termination from our parent. We catch it
726      * only if we are the login shell.
727      */
728 #ifdef BSDSIGS
729     /*
730      * PURIFY-2 claims that osv does not get
731      * initialized after the sigvec call
732      */
733     setzero((char*) &osv, sizeof(osv));
734     /* parents interruptibility */
735     (void) mysigvec(SIGINT, NULL, &osv);
736     parintr = (signalfun_t) osv.sv_handler;
737     (void) mysigvec(SIGTERM, NULL, &osv);
738     parterm = (signalfun_t) osv.sv_handler;
739 #else				/* BSDSIGS */
740     parintr = signal(SIGINT, SIG_IGN);	/* parents interruptibility */
741     (void) sigset(SIGINT, parintr);	/* ... restore */
742 
743 # ifdef COHERENT
744     if (loginsh) /* it seems that SIGTERM is always set to SIG_IGN by */
745                  /* init/getty so it should be set to SIG_DFL - there may be */
746                  /* a better fix for this. */
747          parterm = SIG_DFL;
748     else
749 # else /* !COHERENT */
750     parterm = signal(SIGTERM, SIG_IGN);	/* parents terminability */
751 # endif /* COHERENT */
752     (void) sigset(SIGTERM, parterm);	/* ... restore */
753 
754 #endif /* BSDSIGS */
755 
756 
757 #ifdef TCF
758     /* Enable process migration on ourselves and our progeny */
759     (void) signal(SIGMIGRATE, SIG_DFL);
760 #endif /* TCF */
761 
762     /*
763      * Process the arguments.
764      *
765      * Note that processing of -v/-x is actually delayed till after script
766      * processing.
767      *
768      * We set the first character of our name to be '-' if we are a shell
769      * running interruptible commands.  Many programs which examine ps'es
770      * use this to filter such shells out.
771      */
772     argc--, tempv++;
773     while (argc > 0 && (tcp = tempv[0])[0] == '-' &&
774 	   *++tcp != '\0' && !batch) {
775 	do
776 	    switch (*tcp++) {
777 
778 	    case 0:		/* -	Interruptible, no prompt */
779 		prompt = 0;
780 		setintr = 1;
781 		nofile = 1;
782 		break;
783 
784 	    case 'b':		/* -b	Next arg is input file */
785 		batch = 1;
786 		break;
787 
788 	    case 'c':		/* -c	Command input from arg */
789 		if (argc == 1)
790 		    xexit(0);
791 		argc--, tempv++;
792 #ifdef M_XENIX
793 		/* Xenix Vi bug:
794 		   it relies on a 7 bit environment (/bin/sh), so it
795 		   pass ascii arguments with the 8th bit set */
796 		if (!strcmp(argv[0], "sh"))
797 		  {
798 		    char *p;
799 
800 		    for (p = tempv[0]; *p; ++p)
801 		      *p &= ASCII;
802 		  }
803 #endif
804 		arginp = SAVE(tempv[0]);
805 
806 		/*
807 		 * we put the command into a variable
808 		 */
809 		if (arginp != NULL)
810 		  set(STRcommand, quote(Strsave(arginp)), VAR_READWRITE);
811 
812 		/*
813 		 * * Give an error on -c arguments that end in * backslash to
814 		 * ensure that you don't make * nonportable csh scripts.
815 		 */
816 		{
817 		    register int count;
818 
819 		    cp = arginp + Strlen(arginp);
820 		    count = 0;
821 		    while (cp > arginp && *--cp == '\\')
822 			++count;
823 		    if ((count & 1) != 0) {
824 			exiterr = 1;
825 			stderror(ERR_ARGC);
826 		    }
827 		}
828 		prompt = 0;
829 		nofile = 1;
830 		break;
831 	    case 'd':		/* -d	Load directory stack from file */
832 		rdirs = 1;
833 		break;
834 
835 #ifdef apollo
836 	    case 'D':		/* -D	Define environment variable */
837 		{
838 		    register Char *dp;
839 
840 		    cp = str2short(tcp);
841 		    if (dp = Strchr(cp, '=')) {
842 			*dp++ = '\0';
843 			tsetenv(cp, dp);
844 		    }
845 		    else
846 			tsetenv(cp, STRNULL);
847 		}
848 		*tcp = '\0'; 	/* done with this argument */
849 		break;
850 #endif /* apollo */
851 
852 	    case 'e':		/* -e	Exit on any error */
853 		exiterr = 1;
854 		break;
855 
856 	    case 'f':		/* -f	Fast start */
857 		fast = 1;
858 		break;
859 
860 	    case 'i':		/* -i	Interactive, even if !intty */
861 		intact = 1;
862 		nofile = 1;
863 		break;
864 
865 	    case 'm':		/* -m	read .cshrc (from su) */
866 		mflag = 1;
867 		break;
868 
869 	    case 'n':		/* -n	Don't execute */
870 		noexec = 1;
871 		break;
872 
873 	    case 'q':		/* -q	(Undoc'd) ... die on quit */
874 		quitit = 1;
875 		break;
876 
877 	    case 's':		/* -s	Read from std input */
878 		nofile = 1;
879 		break;
880 
881 	    case 't':		/* -t	Read one line from input */
882 		onelflg = 2;
883 		prompt = 0;
884 		nofile = 1;
885 		break;
886 
887 	    case 'v':		/* -v	Echo hist expanded input */
888 		nverbose = 1;	/* ... later */
889 		break;
890 
891 	    case 'x':		/* -x	Echo just before execution */
892 		nexececho = 1;	/* ... later */
893 		break;
894 
895 	    case 'V':		/* -V	Echo hist expanded input */
896 		setNS(STRverbose);	/* NOW! */
897 		break;
898 
899 	    case 'X':		/* -X	Echo just before execution */
900 		setNS(STRecho);	/* NOW! */
901 		break;
902 
903 	    case 'F':		/* Undocumented flag */
904 		/*
905 		 * This will cause children to be created using fork instead of
906 		 * vfork.
907 		 */
908 		use_fork = 1;
909 		break;
910 
911 	    case ' ':
912 	    case '\t':
913 		/*
914 		 * for O/S's that don't do the argument parsing right in
915 		 * "#!/foo -f " scripts
916 		 */
917 		break;
918 
919 	    default:		/* Unknown command option */
920 		exiterr = 1;
921 		stderror(ERR_TCSHUSAGE, tcp-1, progname);
922 		break;
923 
924 	} while (*tcp);
925 	tempv++, argc--;
926     }
927 
928     if (quitit)			/* With all due haste, for debugging */
929 	(void) signal(SIGQUIT, SIG_DFL);
930 
931     /*
932      * Unless prevented by -, -c, -i, -s, or -t, if there are remaining
933      * arguments the first of them is the name of a shell file from which to
934      * read commands.
935      */
936     if (nofile == 0 && argc > 0) {
937 	nofile = open(tempv[0], O_RDONLY);
938 	if (nofile < 0) {
939 	    child = 1;		/* So this ... */
940 	    /* ... doesn't return */
941 	    stderror(ERR_SYSTEM, tempv[0], strerror(errno));
942 	}
943 	if (ffile != NULL)
944 	    xfree((ptr_t) ffile);
945 	dolzero = 1;
946 	ffile = SAVE(tempv[0]);
947 	/*
948 	 * Replace FSHIN. Handle /dev/std{in,out,err} specially
949 	 * since once they are closed we cannot open them again.
950 	 * In that case we use our own saved descriptors
951 	 */
952 	if ((SHIN = dmove(nofile, FSHIN)) < 0)
953 	    switch(nofile) {
954 	    case 0:
955 		SHIN = FSHIN;
956 		break;
957 	    case 1:
958 		SHIN = FSHOUT;
959 		break;
960 	    case 2:
961 		SHIN = FSHDIAG;
962 		break;
963 	    default:
964 		stderror(ERR_SYSTEM, tempv[0], strerror(errno));
965 		break;
966 	    }
967 	(void) close_on_exec(SHIN, 1);
968 	prompt = 0;
969 	 /* argc not used any more */ tempv++;
970     }
971 
972 
973     /*
974      * Consider input a tty if it really is or we are interactive. but not for
975      * editing (christos)
976      */
977     if (!(intty = isatty(SHIN))) {
978 	if (adrof(STRedit))
979 	    unsetv(STRedit);
980 	editing = 0;
981     }
982     intty |= intact;
983 #ifndef convex
984     if (intty || (intact && isatty(SHOUT))) {
985 	if (!batch && (uid != euid || gid != egid)) {
986 	    errno = EACCES;
987 	    child = 1;		/* So this ... */
988 	    /* ... doesn't return */
989 	    stderror(ERR_SYSTEM, progname, strerror(errno));
990 	}
991     }
992 #endif /* convex */
993     isoutatty = isatty(SHOUT);
994     isdiagatty = isatty(SHDIAG);
995     /*
996      * Decide whether we should play with signals or not. If we are explicitly
997      * told (via -i, or -) or we are a login shell (arg0 starts with -) or the
998      * input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx")
999      * Note that in only the login shell is it likely that parent may have set
1000      * signals to be ignored
1001      */
1002     if (loginsh || intact || (intty && isatty(SHOUT)))
1003 	setintr = 1;
1004     settell();
1005     /*
1006      * Save the remaining arguments in argv.
1007      */
1008     setq(STRargv, blk2short(tempv), &shvhed, VAR_READWRITE);
1009 
1010     /*
1011      * Set up the prompt.
1012      */
1013     if (prompt) {
1014 	if (tcsh)
1015 	    set(STRprompt, Strsave(STRdeftcshprompt), VAR_READWRITE);
1016 	else
1017 	    set(STRprompt, Strsave(STRdefcshprompt), VAR_READWRITE);
1018 	/* that's a meta-questionmark */
1019 	set(STRprompt2, Strsave(STRmquestion), VAR_READWRITE);
1020 	set(STRprompt3, Strsave(STRKCORRECT), VAR_READWRITE);
1021     }
1022 
1023     /*
1024      * If we are an interactive shell, then start fiddling with the signals;
1025      * this is a tricky game.
1026      */
1027     shpgrp = mygetpgrp();
1028     opgrp = tpgrp = -1;
1029     if (setintr) {
1030 	signalfun_t osig;
1031 	**argv = '-';
1032 	if (!quitit)		/* Wary! */
1033 	    (void) signal(SIGQUIT, SIG_IGN);
1034 	(void) sigset(SIGINT, pintr);
1035 	(void) sighold(SIGINT);
1036 	(void) signal(SIGTERM, SIG_IGN);
1037 
1038 	/*
1039 	 * No reason I can see not to save history on all these events..
1040 	 * Most usual occurrence is in a window system, where we're not a login
1041 	 * shell, but might as well be... (sg)
1042 	 * But there might be races when lots of shells exit together...
1043 	 * [this is also incompatible].
1044 	 * We have to be mre careful here. If the parent wants to
1045 	 * ignore the signals then we leave them untouched...
1046 	 * We also only setup the handlers for shells that are trully
1047 	 * interactive.
1048 	 */
1049 	osig = signal(SIGHUP, phup);	/* exit processing on HUP */
1050 	if (!loginsh && osig == SIG_IGN)
1051 	    (void) signal(SIGHUP, osig);
1052 #ifdef SIGXCPU
1053 	osig = signal(SIGXCPU, phup);	/* exit processing on XCPU */
1054 	if (!loginsh && osig == SIG_IGN)
1055 	    (void) signal(SIGXCPU, osig);
1056 #endif
1057 #ifdef SIGXFSZ
1058 	osig = signal(SIGXFSZ, phup);	/* exit processing on XFSZ */
1059 	if (!loginsh && osig == SIG_IGN)
1060 	    (void) signal(SIGXFSZ, osig);
1061 #endif
1062 
1063 	if (quitit == 0 && arginp == 0) {
1064 #ifdef SIGTSTP
1065 	    (void) signal(SIGTSTP, SIG_IGN);
1066 #endif
1067 #ifdef SIGTTIN
1068 	    (void) signal(SIGTTIN, SIG_IGN);
1069 #endif
1070 #ifdef SIGTTOU
1071 	    (void) signal(SIGTTOU, SIG_IGN);
1072 #endif
1073 	    /*
1074 	     * Wait till in foreground, in case someone stupidly runs csh &
1075 	     * dont want to try to grab away the tty.
1076 	     */
1077 	    if (isatty(FSHDIAG))
1078 		f = FSHDIAG;
1079 	    else if (isatty(FSHOUT))
1080 		f = FSHOUT;
1081 	    else if (isatty(OLDSTD))
1082 		f = OLDSTD;
1083 	    else
1084 		f = -1;
1085 
1086 #ifdef NeXT
1087 	    /* NeXT 2.0 /usr/etc/rlogind, does not set our process group! */
1088 	    if (shpgrp == 0) {
1089 	        shpgrp = getpid();
1090 		(void) setpgid(0, shpgrp);
1091 	        (void) tcsetpgrp(f, shpgrp);
1092 	    }
1093 #endif /* NeXT */
1094 #ifdef BSDJOBS			/* if we have tty job control */
1095     retry:
1096 	    if ((tpgrp = tcgetpgrp(f)) != -1) {
1097 		if (tpgrp != shpgrp) {
1098 		    signalfun_t old = signal(SIGTTIN, SIG_DFL);
1099 		    (void) kill(0, SIGTTIN);
1100 		    (void) signal(SIGTTIN, old);
1101 		    goto retry;
1102 		}
1103 		/*
1104 		 * Thanks to Matt Day for the POSIX references, and to
1105 		 * Paul Close for the SGI clarification.
1106 		 */
1107 		if (setdisc(f) != -1) {
1108 		    opgrp = shpgrp;
1109 		    shpgrp = getpid();
1110 		    tpgrp = shpgrp;
1111 		    if (tcsetpgrp(f, shpgrp) == -1) {
1112 			/*
1113 			 * On hpux 7.03 this fails with EPERM. This happens on
1114 			 * the 800 when opgrp != shpgrp at this point. (we were
1115 			 * forked from a non job control shell)
1116 			 * POSIX 7.2.4, says we failed because the process
1117 			 * group specified did not belong to a process
1118 			 * in the same session with the tty. So we set our
1119 			 * process group and try again.
1120 			 */
1121 			if (setpgid(0, shpgrp) == -1) {
1122 			    xprintf("setpgid:");
1123 			    goto notty;
1124 			}
1125 			if (tcsetpgrp(f, shpgrp) == -1) {
1126 			    xprintf("tcsetpgrp:");
1127 			    goto notty;
1128 			}
1129 		    }
1130 		    /*
1131 		     * We check the process group now. If it is the same, then
1132 		     * we don't need to set it again. On hpux 7.0 on the 300's
1133 		     * if we set it again it fails with EPERM. This is the
1134 		     * correct behavior according to POSIX 4.3.3 if the process
1135 		     * was a session leader .
1136 		     */
1137 		    else if (shpgrp != mygetpgrp()) {
1138 			if(setpgid(0, shpgrp) == -1) {
1139 			    xprintf("setpgid:");
1140 			    goto notty;
1141 			}
1142 		    }
1143 #ifdef IRIS4D
1144 		    /*
1145 		     * But on irix 3.3 we need to set it again, even if it is
1146 		     * the same. We do that to tell the system that we
1147 		     * need BSD process group compatibility.
1148 		     */
1149 		    else
1150 			(void) setpgid(0, shpgrp);
1151 #endif
1152 		    (void) close_on_exec(dcopy(f, FSHTTY), 1);
1153 		}
1154 		else
1155 		    tpgrp = -1;
1156 	    }
1157 	    if (tpgrp == -1) {
1158 	notty:
1159 		xprintf(CGETS(11, 1, "Warning: no access to tty (%s).\n"),
1160 			strerror(errno));
1161 		xprintf(CGETS(11, 2, "Thus no job control in this shell.\n"));
1162 		/*
1163 		 * Fix from:Sakari Jalovaara <sja@sirius.hut.fi> if we don't
1164 		 * have access to tty, disable editing too
1165 		 */
1166 		if (adrof(STRedit))
1167 		    unsetv(STRedit);
1168 		editing = 0;
1169 	    }
1170 #else	/* BSDJOBS */		/* don't have job control, so frotz it */
1171 	    tpgrp = -1;
1172 #endif				/* BSDJOBS */
1173 	}
1174     }
1175     if ((setintr == 0) && (parintr == SIG_DFL))
1176 	setintr = 1;
1177 
1178 /*
1179  * SVR4 doesn't send a SIGCHLD when a child is stopped or continued if the
1180  * handler is installed with signal(2) or sigset(2).  sigaction(2) must
1181  * be used instead.
1182  *
1183  * David Dawes (dawes@physics.su.oz.au) Sept 1991
1184  */
1185 
1186 #if SYSVREL > 3
1187     {
1188 	struct sigaction act;
1189         act.sa_handler=pchild;
1190 	(void) sigemptyset(&(act.sa_mask));	/* Don't block any extra sigs
1191 						 * when the handler is called
1192 						 */
1193         act.sa_flags=0;	           /* want behaviour of sigset() without
1194                                     * SA_NOCLDSTOP
1195 				    */
1196 
1197         if ((sigaction(SIGCHLD,&act,(struct sigaction *)NULL)) == -1)
1198 	    stderror(ERR_SYSTEM, "sigaction", strerror(errno));
1199     }
1200 #else /* SYSVREL <= 3 */
1201     (void) sigset(SIGCHLD, pchild);	/* while signals not ready */
1202 #endif /* SYSVREL <= 3 */
1203 
1204 
1205     if (intty && !arginp)
1206 	(void) ed_Setup(editing);/* Get the tty state, and set defaults */
1207 				 /* Only alter the tty state if editing */
1208 
1209     /*
1210      * Set an exit here in case of an interrupt or error reading the shell
1211      * start-up scripts.
1212      */
1213     reenter = setexit();	/* PWP */
1214     haderr = 0;			/* In case second time through */
1215     if (!fast && reenter == 0) {
1216 	/* Will have varval(STRhome) here because set fast if don't */
1217 	{
1218 	    int     osetintr = setintr;
1219 	    signalfun_t oparintr = parintr;
1220 
1221 #ifdef BSDSIGS
1222 	    sigmask_t omask = sigblock(sigmask(SIGINT));
1223 #else
1224 	    (void) sighold(SIGINT);
1225 #endif
1226 	    setintr = 0;
1227 	    parintr = SIG_IGN;	/* onintr in /etc/ files has no effect */
1228 #ifdef LOGINFIRST
1229 #ifdef _PATH_DOTLOGIN
1230 	    if (loginsh)
1231 	      (void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL);
1232 #endif
1233 #endif
1234 
1235 #ifdef _PATH_DOTCSHRC
1236 	    (void) srcfile(_PATH_DOTCSHRC, 0, 0, NULL);
1237 #endif
1238 	    if (!arginp && !onelflg && !havhash)
1239 		dohash(NULL,NULL);
1240 #ifndef LOGINFIRST
1241 #ifdef _PATH_DOTLOGIN
1242 	    if (loginsh)
1243 		(void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL);
1244 #endif
1245 #endif
1246 #ifdef BSDSIGS
1247 	    (void) sigsetmask(omask);
1248 #else
1249 	    (void) sigrelse(SIGINT);
1250 #endif
1251 	    setintr = osetintr;
1252 	    parintr = oparintr;
1253 	}
1254 #ifdef LOGINFIRST
1255 	if (loginsh)
1256 	    (void) srccat(varval(STRhome), STRsldotlogin);
1257 #endif
1258 	/* upward compat. */
1259 	if (!srccat(varval(STRhome), STRsldottcshrc))
1260 	    (void) srccat(varval(STRhome), STRsldotcshrc);
1261 
1262 	if (!fast && !arginp && !onelflg && !havhash)
1263 	    dohash(NULL,NULL);
1264 
1265 	/*
1266 	 * Source history before .login so that it is available in .login
1267 	 */
1268 	loadhist(NULL, 0);
1269 #ifndef LOGINFIRST
1270 	if (loginsh)
1271 	    (void) srccat(varval(STRhome), STRsldotlogin);
1272 #endif
1273 	if (!fast && (loginsh || rdirs))
1274 	    loaddirs(NULL);
1275     }
1276     /* Initing AFTER .cshrc is the Right Way */
1277     if (intty && !arginp) {	/* PWP setup stuff */
1278 	ed_Init();		/* init the new line editor */
1279 #ifdef SIG_WINDOW
1280 	check_window_size(1);	/* mung environment */
1281 #endif				/* SIG_WINDOW */
1282     }
1283 
1284     /*
1285      * dspkanji/dspmbyte autosetting
1286      */
1287     /* PATCH IDEA FROM Issei.Suzuki VERY THANKS */
1288 #if defined(DSPMBYTE)
1289     if ((tcp = getenv("LANG")) != NULL && !adrof(CHECK_MBYTEVAR)) {
1290 	autoset_dspmbyte(str2short(tcp));
1291     }
1292 #if defined(WINNT)
1293     else if (!adrof(CHECK_MBYTEVAR))
1294       nt_autoset_dspmbyte();
1295 #endif /* WINNT */
1296 #endif
1297 
1298     /*
1299      * Now are ready for the -v and -x flags
1300      */
1301     if (nverbose)
1302 	setNS(STRverbose);
1303     if (nexececho)
1304 	setNS(STRecho);
1305 
1306     /*
1307      * All the rest of the world is inside this call. The argument to process
1308      * indicates whether it should catch "error unwinds".  Thus if we are a
1309      * interactive shell our call here will never return by being blown past on
1310      * an error.
1311      */
1312     process(setintr);
1313 
1314     /*
1315      * Mop-up.
1316      */
1317     if (intty) {
1318 	if (loginsh) {
1319 	    xprintf("logout\n");
1320 	    (void) close(SHIN);
1321 	    child = 1;
1322 #ifdef TESLA
1323 	    do_logout = 1;
1324 #endif				/* TESLA */
1325 	    goodbye(NULL, NULL);
1326 	}
1327 	else {
1328 	    xprintf("exit\n");
1329 	}
1330     }
1331     record();
1332     exitstat();
1333     return (0);
1334 }
1335 
1336 void
1337 untty()
1338 {
1339 #ifdef BSDJOBS
1340     if (tpgrp > 0 && opgrp != shpgrp) {
1341 	(void) setpgid(0, opgrp);
1342 	(void) tcsetpgrp(FSHTTY, opgrp);
1343 	(void) resetdisc(FSHTTY);
1344     }
1345 #endif /* BSDJOBS */
1346 }
1347 
1348 void
1349 importpath(cp)
1350     Char   *cp;
1351 {
1352     register int i = 0;
1353     register Char *dp;
1354     register Char **pv;
1355     int     c;
1356 
1357     for (dp = cp; *dp; dp++)
1358 	if (*dp == PATHSEP)
1359 	    i++;
1360     /*
1361      * i+2 where i is the number of colons in the path. There are i+1
1362      * directories in the path plus we need room for a zero terminator.
1363      */
1364     pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char *));
1365     dp = cp;
1366     i = 0;
1367     if (*dp)
1368 	for (;;) {
1369 	    if ((c = *dp) == PATHSEP || c == 0) {
1370 		*dp = 0;
1371 		pv[i++] = Strsave(*cp ? cp : STRdot);
1372 		if (c) {
1373 		    cp = dp + 1;
1374 		    *dp = PATHSEP;
1375 		}
1376 		else
1377 		    break;
1378 	    }
1379 #ifdef WINNT
1380 	    else if (*dp == '\\')
1381 		*dp = '/';
1382 #endif /* WINNT */
1383 	    dp++;
1384 	}
1385     pv[i] = 0;
1386     setq(STRpath, pv, &shvhed, VAR_READWRITE);
1387 }
1388 
1389 /*
1390  * Source to the file which is the catenation of the argument names.
1391  */
1392 static int
1393 srccat(cp, dp)
1394     Char   *cp, *dp;
1395 {
1396     if (cp[0] == '/' && cp[1] == '\0')
1397 	return srcfile(short2str(dp), (mflag ? 0 : 1), 0, NULL);
1398     else {
1399 	register Char *ep;
1400 	char   *ptr;
1401 	int rv;
1402 
1403 #ifdef WINNT
1404 	ep = cp;
1405 	while(*ep)
1406 	    ep++;
1407 	if (ep[-1] == '/' && dp[0] == '/') /* silly win95 */
1408 	    dp++;
1409 #endif /* WINNT */
1410 
1411 	ep = Strspl(cp, dp);
1412 	ptr = short2str(ep);
1413 
1414 	rv = srcfile(ptr, (mflag ? 0 : 1), 0, NULL);
1415 	xfree((ptr_t) ep);
1416 	return rv;
1417     }
1418 }
1419 
1420 /*
1421  * Source to a file putting the file descriptor in a safe place (> 2).
1422  */
1423 static int
1424 srcfile(f, onlyown, flag, av)
1425     char   *f;
1426     bool    onlyown;
1427     int flag;
1428     Char **av;
1429 {
1430     register int unit;
1431 
1432     if ((unit = open(f, O_RDONLY)) == -1)
1433 	return 0;
1434     unit = dmove(unit, -1);
1435 
1436     (void) close_on_exec(unit, 1);
1437     srcunit(unit, onlyown, flag, av);
1438     return 1;
1439 }
1440 
1441 
1442 /*
1443  * Save the shell state, and establish new argument vector, and new input
1444  * fd.
1445  */
1446 static void
1447 st_save(st, unit, hflg, al, av)
1448     struct saved_state *st;
1449     int unit, hflg;
1450     Char **al, **av;
1451 {
1452     st->insource	= insource;
1453     st->SHIN		= SHIN;
1454     st->intty		= intty;
1455     st->whyles		= whyles;
1456     st->gointr		= gointr;
1457     st->arginp		= arginp;
1458     st->evalp		= evalp;
1459     st->evalvec		= evalvec;
1460     st->alvecp		= alvecp;
1461     st->alvec		= alvec;
1462     st->onelflg		= onelflg;
1463     st->enterhist	= enterhist;
1464     if (hflg)
1465 	st->HIST	= HIST;
1466     else
1467 	st->HIST	= '\0';
1468     st->cantell		= cantell;
1469     cpybin(st->B, B);
1470 
1471     /*
1472      * we can now pass arguments to source.
1473      * For compatibility we do that only if arguments were really
1474      * passed, otherwise we keep the old, global $argv like before.
1475      */
1476     if (av != NULL && *av != NULL) {
1477 	struct varent *vp;
1478 	if ((vp = adrof(STRargv)) != NULL)
1479 	    st->argv = saveblk(vp->vec);
1480 	else
1481 	    st->argv = NULL;
1482 	setq(STRargv, saveblk(av), &shvhed, VAR_READWRITE);
1483     }
1484     else
1485 	st->argv = NULL;
1486 
1487     SHIN	= unit;	/* Do this first */
1488 
1489     /* Establish new input arena */
1490     {
1491 	fbuf = NULL;
1492 	fseekp = feobp = fblocks = 0;
1493 	settell();
1494     }
1495 
1496     arginp	= 0;
1497     onelflg	= 0;
1498     intty	= isatty(SHIN);
1499     whyles	= 0;
1500     gointr	= 0;
1501     evalvec	= 0;
1502     evalp	= 0;
1503     alvec	= al;
1504     alvecp	= 0;
1505     enterhist	= hflg;
1506     if (enterhist)
1507 	HIST	= '\0';
1508     insource	= 1;
1509 }
1510 
1511 
1512 /*
1513  * Restore the shell to a saved state
1514  */
1515 static void
1516 st_restore(st, av)
1517     struct saved_state *st;
1518     Char **av;
1519 {
1520     if (st->SHIN == -1)
1521 	return;
1522 
1523     /* Reset input arena */
1524     {
1525 	register int i;
1526 	register Char** nfbuf = fbuf;
1527 	register int nfblocks = fblocks;
1528 
1529 	fblocks = 0;
1530 	fbuf = NULL;
1531 	for (i = 0; i < nfblocks; i++)
1532 	    xfree((ptr_t) nfbuf[i]);
1533 	xfree((ptr_t) nfbuf);
1534     }
1535     cpybin(B, st->B);
1536 
1537     (void) close(SHIN);
1538 
1539     insource	= st->insource;
1540     SHIN	= st->SHIN;
1541     arginp	= st->arginp;
1542     onelflg	= st->onelflg;
1543     evalp	= st->evalp;
1544     evalvec	= st->evalvec;
1545     alvecp	= st->alvecp;
1546     alvec	= st->alvec;
1547     intty	= st->intty;
1548     whyles	= st->whyles;
1549     gointr	= st->gointr;
1550     if (st->HIST != '\0')
1551 	HIST	= st->HIST;
1552     enterhist	= st->enterhist;
1553     cantell	= st->cantell;
1554 
1555     if (st->argv != NULL)
1556 	setq(STRargv, st->argv, &shvhed, VAR_READWRITE);
1557     else if (av != NULL  && *av != NULL && adrof(STRargv) != NULL)
1558 	unsetv(STRargv);
1559 }
1560 
1561 /*
1562  * Source to a unit.  If onlyown it must be our file or our group or
1563  * we don't chance it.	This occurs on ".cshrc"s and the like.
1564  */
1565 static void
1566 srcunit(unit, onlyown, hflg, av)
1567     register int unit;
1568     bool    onlyown;
1569     int hflg;
1570     Char **av;
1571 {
1572     struct saved_state st;
1573     st.SHIN = -1;	/* st_restore checks this */
1574 
1575     if (unit < 0)
1576 	return;
1577 
1578     if (didfds)
1579 	donefds();
1580 
1581     if (onlyown) {
1582 	struct stat stb;
1583 
1584 	if (fstat(unit, &stb) < 0) {
1585 	    (void) close(unit);
1586 	    return;
1587 	}
1588     }
1589 
1590     getexit(st.oldexit);
1591 
1592     if (setintr)
1593 #ifdef BSDSIGS
1594 	st.mask = sigblock(sigmask(SIGINT));
1595 #else
1596 	(void) sighold(SIGINT);
1597 #endif
1598 
1599     /* Save the current state and move us to a new state */
1600     st_save(&st, unit, hflg, NULL, av);
1601 
1602     /*
1603      * Now if we are allowing commands to be interrupted, we let ourselves be
1604      * interrupted.
1605      */
1606     if (setintr)
1607 #ifdef BSDSIGS
1608 	(void) sigsetmask(st.mask);
1609 #else
1610 	(void) sigrelse(SIGINT);
1611 #endif
1612 
1613     /*
1614      * Bugfix for running out of memory by: Jak Kirman
1615      * <jak%cs.brown.edu@RELAY.CS.NET>.  Solution: pay attention to what
1616      * setexit() is returning because reenter _may_ be in a register, and
1617      * thus restored to 0 on a longjump(). (PWP: insert flames about
1618      * compiler-dependant code here) PWP: THANKS LOTS !!!
1619      *
1620      * PWP: think of this as like a LISP (unwind-protect ...)
1621      * thanks to Diana Smetters for pointing out how this _should_ be written
1622      */
1623 #ifdef cray
1624     st.reenter = 1;		/* assume non-zero return val */
1625     if (setexit() == 0) {
1626 	st.reenter = 0;		/* Oh well, we were wrong */
1627 #else
1628     if ((st.reenter = setexit()) == 0) {
1629 #endif
1630 	process(0);		/* 0 -> blow away on errors */
1631     }
1632 
1633     if (setintr)
1634 #ifdef BSDSIGS
1635 	(void) sigsetmask(st.mask);
1636 #else
1637 	(void) sigrelse(SIGINT);
1638 #endif
1639 
1640     /* Restore the old state */
1641     st_restore(&st, av);
1642     resexit(st.oldexit);
1643     /*
1644      * If process reset() (effectively an unwind) then we must also unwind.
1645      */
1646     if (st.reenter)
1647 	stderror(ERR_SILENT);
1648 }
1649 
1650 
1651 /*ARGSUSED*/
1652 void
1653 goodbye(v, c)
1654     Char **v;
1655     struct command *c;
1656 {
1657     USE(c);
1658     record();
1659 
1660     if (loginsh) {
1661 	(void) sigset(SIGQUIT, SIG_IGN);
1662 	(void) sigset(SIGINT, SIG_IGN);
1663 	(void) sigset(SIGTERM, SIG_IGN);
1664 	(void) sigset(SIGHUP, SIG_IGN);
1665 	setintr = 0;		/* No interrupts after "logout" */
1666 	/* Trap errors inside .logout */
1667 	reenter = setexit();
1668 	if (reenter != 0)
1669 	    exitstat();
1670 	if (!(adrof(STRlogout)))
1671 	    set(STRlogout, Strsave(STRnormal), VAR_READWRITE);
1672 #ifdef _PATH_DOTLOGOUT
1673 	(void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL);
1674 #endif
1675 	if (adrof(STRhome))
1676 	    (void) srccat(varval(STRhome), STRsldtlogout);
1677 #ifdef TESLA
1678 	do_logout = 1;
1679 #endif /* TESLA */
1680     }
1681     exitstat();
1682 }
1683 
1684 void
1685 exitstat()
1686 {
1687 #ifdef PROF
1688     monitor(0);
1689 #endif
1690     /*
1691      * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit
1692      * directly because we poke child here. Otherwise we might continue
1693      * unwarrantedly (sic).
1694      */
1695     child = 1;
1696 
1697     xexit(getn(varval(STRstatus)));
1698 }
1699 
1700 /*
1701  * in the event of a HUP we want to save the history
1702  */
1703 static  sigret_t
1704 phup(snum)
1705 int snum;
1706 {
1707     /*
1708      * There is no return from here,
1709      * so we are not going to release SIGHUP
1710      * anymore
1711      */
1712 #ifdef UNRELSIGS
1713     if (snum)
1714 	(void) sigset(snum, SIG_IGN);
1715 #else
1716 # ifdef BSDSIGS
1717     (void) sigblock(sigmask(SIGHUP));
1718 # else
1719     (void) sighold(SIGHUP);
1720 # endif /* BSDSIGS */
1721 #endif /* UNRELSIGS */
1722 
1723     if (loginsh) {
1724 	set(STRlogout, Strsave(STRhangup), VAR_READWRITE);
1725 #ifdef _PATH_DOTLOGOUT
1726 	(void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL);
1727 #endif
1728 	if (adrof(STRhome))
1729 	    (void) srccat(varval(STRhome), STRsldtlogout);
1730     }
1731 
1732     record();
1733 
1734 #ifdef POSIXJOBS
1735     /*
1736      * We kill the last foreground process group. It then becomes
1737      * responsible to propagate the SIGHUP to its progeny.
1738      */
1739     {
1740 	struct process *pp, *np;
1741 
1742 	for (pp = proclist.p_next; pp; pp = pp->p_next) {
1743 	    np = pp;
1744 	    /*
1745 	     * Find if this job is in the foreground. It could be that
1746 	     * the process leader has exited and the foreground flag
1747 	     * is cleared for it.
1748 	     */
1749 	    do
1750 		/*
1751 		 * If a process is in the foreground we try to kill
1752 		 * it's process group. If we succeed, then the
1753 		 * whole job is gone. Otherwise we keep going...
1754 		 * But avoid sending HUP to the shell again.
1755 		 */
1756 		if (((np->p_flags & PFOREGND) != 0) && np->p_jobid != shpgrp) {
1757 		    np->p_flags &= ~PHUP;
1758 		    if (killpg(np->p_jobid, SIGHUP) != -1) {
1759 			/* In case the job was suspended... */
1760 #ifdef SIGCONT
1761 			(void) killpg(np->p_jobid, SIGCONT);
1762 #endif
1763 			break;
1764 		    }
1765 		}
1766 	    while ((np = np->p_friends) != pp);
1767 	}
1768     }
1769 #endif /* POSIXJOBS */
1770 
1771     xexit(snum);
1772 #ifndef SIGVOID
1773     return (snum);
1774 #endif
1775 }
1776 
1777 static Char   *jobargv[2] = {STRjobs, 0};
1778 
1779 /*
1780  * Catch an interrupt, e.g. during lexical input.
1781  * If we are an interactive shell, we reset the interrupt catch
1782  * immediately.  In any case we drain the shell output,
1783  * and finally go through the normal error mechanism, which
1784  * gets a chance to make the shell go away.
1785  */
1786 int     just_signaled;		/* bugfix by Michael Bloom (mg@ttidca.TTI.COM) */
1787 
1788 #ifdef SIGVOID
1789 /*ARGSUSED*/
1790 #endif
1791 sigret_t
1792 pintr(snum)
1793 int snum;
1794 {
1795 #ifdef UNRELSIGS
1796     if (snum)
1797 	(void) sigset(snum, pintr);
1798 #endif /* UNRELSIGS */
1799     just_signaled = 1;
1800     pintr1(1);
1801 #ifndef SIGVOID
1802     return (snum);
1803 #endif
1804 }
1805 
1806 void
1807 pintr1(wantnl)
1808     bool    wantnl;
1809 {
1810     register Char **v;
1811 #ifdef BSDSIGS
1812     sigmask_t omask;
1813 #endif
1814 
1815 #ifdef BSDSIGS
1816     omask = sigblock((sigmask_t) 0);
1817 #endif
1818     if (setintr) {
1819 #ifdef BSDSIGS
1820 	(void) sigsetmask(omask & ~sigmask(SIGINT));
1821 #else
1822 	(void) sigrelse(SIGINT);
1823 #endif
1824 	if (pjobs) {
1825 	    pjobs = 0;
1826 	    xputchar('\n');
1827 	    dojobs(jobargv, NULL);
1828 	    stderror(ERR_NAME | ERR_INTR);
1829 	}
1830     }
1831     /* MH - handle interrupted completions specially */
1832     {
1833 	extern int InsideCompletion;
1834 
1835 	if (InsideCompletion)
1836 	    stderror(ERR_SILENT);
1837     }
1838     /* JV - Make sure we shut off inputl */
1839     {
1840 	extern Char GettingInput;
1841 
1842 	(void) Cookedmode();
1843 	GettingInput = 0;
1844     }
1845 #ifdef BSDSIGS
1846     (void) sigsetmask(omask & ~sigmask(SIGCHLD));
1847 #else
1848     if (setintr)
1849 	(void) sighold(SIGINT);
1850     (void) sigrelse(SIGCHLD);
1851 #endif
1852     drainoline();
1853 #if !defined(_VMS_POSIX) && !defined(WINNT)
1854     (void) endpwent();
1855 #endif /* !_VMS_POSIX && !WINNT */
1856 
1857     /*
1858      * If we have an active "onintr" then we search for the label. Note that if
1859      * one does "onintr -" then we shan't be interruptible so we needn't worry
1860      * about that here.
1861      */
1862     if (gointr) {
1863 	gotolab(gointr);
1864 	timflg = 0;
1865 	if ((v = pargv) != 0)
1866 	    pargv = 0, blkfree(v);
1867 	if ((v = gargv) != 0)
1868 	    gargv = 0, blkfree(v);
1869 	reset();
1870     }
1871     else if (intty && wantnl) {
1872 	if (editing) {
1873 	    /*
1874 	     * If we are editing a multi-line input command, and move to
1875 	     * the beginning of the line, we don't want to trash it when
1876 	     * we hit ^C
1877 	     */
1878 	    PastBottom();
1879 	    ClearLines();
1880 	    ClearDisp();
1881 	}
1882 	else {
1883 	    /* xputchar('\n'); *//* Some like this, others don't */
1884 	    (void) putraw('\r');
1885 	    (void) putraw('\n');
1886 	}
1887     }
1888     stderror(ERR_SILENT);
1889 }
1890 
1891 /*
1892  * Process is the main driving routine for the shell.
1893  * It runs all command processing, except for those within { ... }
1894  * in expressions (which is run by a routine evalav in sh.exp.c which
1895  * is a stripped down process), and `...` evaluation which is run
1896  * also by a subset of this code in sh.glob.c in the routine backeval.
1897  *
1898  * The code here is a little strange because part of it is interruptible
1899  * and hence freeing of structures appears to occur when none is necessary
1900  * if this is ignored.
1901  *
1902  * Note that if catch is not set then we will unwind on any error.
1903  * If an end-of-file occurs, we return.
1904  */
1905 static struct command *savet = NULL;
1906 void
1907 process(catch)
1908     bool    catch;
1909 {
1910     extern char Expand;
1911     jmp_buf_t osetexit;
1912     /* PWP: This might get nuked my longjmp so don't make it a register var */
1913     struct command *t = savet;
1914 
1915     savet = NULL;
1916     getexit(osetexit);
1917     for (;;) {
1918 
1919 	pendjob();
1920 
1921 	/* This was leaking memory badly, particularly when sourcing
1922 	 * files, etc.. For whatever reason we were arriving here with
1923 	 * allocated pointers still active, and the code was simply
1924 	 * overwriting them.  I can't say I fully understand the
1925 	 * control flow here, but according to Purify this particular
1926 	 * leak has been plugged, and I haven't noticed any ill
1927 	 * effects.. (sg)
1928 	 */
1929 	if (paraml.next && paraml.next != &paraml)
1930 	    freelex(&paraml);
1931 
1932 	paraml.next = paraml.prev = &paraml;
1933 	paraml.word = STRNULL;
1934 	(void) setexit();
1935 	justpr = enterhist;	/* execute if not entering history */
1936 
1937 	/*
1938 	 * Interruptible during interactive reads
1939 	 */
1940 	if (setintr)
1941 #ifdef BSDSIGS
1942 	    (void) sigsetmask(sigblock((sigmask_t) 0) & ~sigmask(SIGINT));
1943 #else
1944 	    (void) sigrelse(SIGINT);
1945 #endif
1946 
1947 
1948 	/*
1949 	 * For the sake of reset()
1950 	 */
1951 	freelex(&paraml);
1952 	if (savet)
1953 	    freesyn(savet), savet = NULL;
1954 
1955 	if (haderr) {
1956 	    if (!catch) {
1957 		/* unwind */
1958 		doneinp = 0;
1959 		savet = t;
1960 		resexit(osetexit);
1961 		reset();
1962 	    }
1963 	    haderr = 0;
1964 	    /*
1965 	     * Every error is eventually caught here or the shell dies.  It is
1966 	     * at this point that we clean up any left-over open files, by
1967 	     * closing all but a fixed number of pre-defined files.  Thus
1968 	     * routines don't have to worry about leaving files open due to
1969 	     * deeper errors... they will get closed here.
1970 	     */
1971 	    closem();
1972 	    continue;
1973 	}
1974 	if (doneinp) {
1975 	    doneinp = 0;
1976 	    break;
1977 	}
1978 	if (chkstop)
1979 	    chkstop--;
1980 	if (neednote)
1981 	    pnote();
1982 	if (intty && prompt && evalvec == 0) {
1983 	    just_signaled = 0;
1984 	    mailchk();
1985 	    /*
1986 	     * Watch for logins/logouts. Next is scheduled commands stored
1987 	     * previously using "sched." Then execute periodic commands.
1988 	     * Following that, the prompt precmd is run.
1989 	     */
1990 #ifndef HAVENOUTMP
1991 	    watch_login(0);
1992 #endif /* !HAVENOUTMP */
1993 	    sched_run(0);
1994 	    period_cmd();
1995 	    precmd();
1996 	    /*
1997 	     * If we are at the end of the input buffer then we are going to
1998 	     * read fresh stuff. Otherwise, we are rereading input and don't
1999 	     * need or want to prompt.
2000 	     */
2001 	    if (fseekp == feobp && aret == F_SEEK)
2002 		printprompt(0, NULL);
2003 	    flush();
2004 	    setalarm(1);
2005 	}
2006 	if (seterr) {
2007 	    xfree((ptr_t) seterr);
2008 	    seterr = NULL;
2009 	}
2010 
2011 	/*
2012 	 * Echo not only on VERBOSE, but also with history expansion. If there
2013 	 * is a lexical error then we forego history echo.
2014 	 */
2015 	if ((lex(&paraml) && !seterr && intty && !tellwhat && !Expand &&
2016 	     !whyles) || adrof(STRverbose)) {
2017 	    haderr = 1;
2018 	    prlex(&paraml);
2019 	    haderr = 0;
2020 	}
2021 	(void) alarm(0);	/* Autologout OFF */
2022 
2023 	/*
2024 	 * The parser may lose space if interrupted.
2025 	 */
2026 	if (setintr)
2027 #ifdef BSDSIGS
2028 	    (void) sigblock(sigmask(SIGINT));
2029 #else
2030 	    (void) sighold(SIGINT);
2031 #endif
2032 
2033 	/*
2034 	 * Save input text on the history list if reading in old history, or it
2035 	 * is from the terminal at the top level and not in a loop.
2036 	 *
2037 	 * PWP: entry of items in the history list while in a while loop is done
2038 	 * elsewhere...
2039 	 */
2040 	if (enterhist || (catch && intty && !whyles && !tellwhat && !arun))
2041 	    savehist(&paraml, enterhist > 1);
2042 
2043 	if (Expand && seterr)
2044 	    Expand = 0;
2045 
2046 	/*
2047 	 * Print lexical error messages, except when sourcing history lists.
2048 	 */
2049 	if (!enterhist && seterr)
2050 	    stderror(ERR_OLD);
2051 
2052 	/*
2053 	 * If had a history command :p modifier then this is as far as we
2054 	 * should go
2055 	 */
2056 	if (justpr)
2057 	    reset();
2058 
2059 	/*
2060 	 * If had a tellwhat from twenex() then do
2061 	 */
2062 	if (tellwhat) {
2063 	    (void) tellmewhat(&paraml, NULL);
2064 	    reset();
2065 	}
2066 
2067 	alias(&paraml);
2068 
2069 #ifdef BSDJOBS
2070 	/*
2071 	 * If we are interactive, try to continue jobs that we have stopped
2072 	 */
2073 	if (prompt)
2074 	    continue_jobs(&paraml);
2075 #endif				/* BSDJOBS */
2076 
2077 	/*
2078 	 * Check to see if the user typed "rm * .o" or something
2079 	 */
2080 	if (prompt)
2081 	    rmstar(&paraml);
2082 	/*
2083 	 * Parse the words of the input into a parse tree.
2084 	 */
2085 	savet = syntax(paraml.next, &paraml, 0);
2086 	if (seterr)
2087 	    stderror(ERR_OLD);
2088 
2089 	postcmd();
2090 	/*
2091 	 * Execute the parse tree From: Michael Schroeder
2092 	 * <mlschroe@immd4.informatik.uni-erlangen.de> was execute(t, tpgrp);
2093 	 */
2094 	execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL);
2095 
2096 	/*
2097 	 * Made it!
2098 	 */
2099 	freelex(&paraml);
2100 	freesyn(savet), savet = NULL;
2101 #ifdef SIG_WINDOW
2102 	if (catch && intty && !whyles && !tellwhat)
2103 	    (void) window_change(0);	/* for window systems */
2104 #endif /* SIG_WINDOW */
2105 	set(STR_, Strsave(InputBuf), VAR_READWRITE | VAR_NOGLOB);
2106     }
2107     savet = t;
2108     resexit(osetexit);
2109 }
2110 
2111 /*ARGSUSED*/
2112 void
2113 dosource(t, c)
2114     register Char **t;
2115     struct command *c;
2116 {
2117     register Char *f;
2118     bool    hflg = 0;
2119     extern int bequiet;
2120     char    buf[BUFSIZE];
2121 
2122     USE(c);
2123     t++;
2124     if (*t && eq(*t, STRmh)) {
2125 	if (*++t == NULL)
2126 	    stderror(ERR_NAME | ERR_HFLAG);
2127 	hflg++;
2128     }
2129     else if (*t && eq(*t, STRmm)) {
2130     	if (*++t == NULL)
2131 	    stderror(ERR_NAME | ERR_MFLAG);
2132 	hflg = 2;
2133     }
2134 
2135     f = globone(*t++, G_ERROR);
2136     (void) strcpy(buf, short2str(f));
2137     xfree((ptr_t) f);
2138     if ((!srcfile(buf, 0, hflg, t)) && (!hflg) && (!bequiet))
2139 	stderror(ERR_SYSTEM, buf, strerror(errno));
2140 }
2141 
2142 /*
2143  * Check for mail.
2144  * If we are a login shell, then we don't want to tell
2145  * about any mail file unless its been modified
2146  * after the time we started.
2147  * This prevents us from telling the user things he already
2148  * knows, since the login program insists on saying
2149  * "You have mail."
2150  */
2151 
2152 /*
2153  * The AMS version.
2154  * This version checks if the file is a directory, and if so,
2155  * tells you the number of files in it, otherwise do the old thang.
2156  * The magic "+1" in the time calculation is to compensate for
2157  * an AFS bug where directory mtimes are set to 1 second in
2158  * the future.
2159  */
2160 
2161 static void
2162 mailchk()
2163 {
2164     register struct varent *v;
2165     register Char **vp;
2166     time_t  t;
2167     int     intvl, cnt;
2168     struct stat stb;
2169     bool    new;
2170 
2171     v = adrof(STRmail);
2172     if (v == 0)
2173 	return;
2174     (void) time(&t);
2175     vp = v->vec;
2176     cnt = blklen(vp);
2177     intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL;
2178     if (intvl < 1)
2179 	intvl = 1;
2180     if (chktim + intvl > t)
2181 	return;
2182     for (; *vp; vp++) {
2183 	char *filename = short2str(*vp);
2184 	char *mboxdir = filename;
2185 
2186 	if (stat(filename, &stb) < 0)
2187 	    continue;
2188 #if defined(BSDTIMES) || defined(_SEQUENT_)
2189 	new = stb.st_mtime > time0.tv_sec;
2190 #else
2191 	new = stb.st_mtime > seconds0;
2192 #endif
2193 	if (S_ISDIR(stb.st_mode)) {
2194 	    DIR *mailbox;
2195 	    int mailcount = 0;
2196 	    char tempfilename[MAXPATHLEN];
2197 	    struct stat stc;
2198 
2199 	    xsnprintf(tempfilename, MAXPATHLEN, "%s/new", filename);
2200 
2201 	    if (stat(tempfilename, &stc) != -1 && S_ISDIR(stc.st_mode)) {
2202 		/*
2203 		 * "filename/new" exists and is a directory; you are
2204 		 * using Qmail.
2205 		 */
2206 		stb = stc;
2207 #if defined(BSDTIMES) || defined(_SEQUENT_)
2208 		new = stb.st_mtime > time0.tv_sec;
2209 #else
2210 		new = stb.st_mtime > seconds0;
2211 #endif
2212 		mboxdir = tempfilename;
2213 	    }
2214 
2215 	    if (stb.st_mtime <= chktim + 1 || (loginsh && !new))
2216 		continue;
2217 
2218 	    if ((mailbox = opendir(mboxdir)) == NULL)
2219 		continue;
2220 
2221 	    /* skip . and .. */
2222 	    if (!readdir(mailbox) || !readdir(mailbox))
2223 		continue;
2224 
2225 	    while (readdir(mailbox))
2226 		mailcount++;
2227 
2228 	    if (mailcount == 0)
2229 		continue;
2230 
2231 	    if (cnt == 1)
2232 		xprintf(CGETS(11, 3, "You have %d mail messages.\n"),
2233 			mailcount);
2234 	    else
2235 		xprintf(CGETS(11, 4, "You have %d mail messages in %s.\n"),
2236 			mailcount, filename);
2237 	}
2238 	else {
2239 	    if (stb.st_size == 0 || stb.st_atime > stb.st_mtime ||
2240 		(stb.st_atime <= chktim && stb.st_mtime <= chktim) ||
2241 		(loginsh && !new))
2242 		continue;
2243 	    if (cnt == 1)
2244 		xprintf(CGETS(11, 5, "You have %smail.\n"),
2245 			new ? CGETS(11, 6, "new ") : "");
2246 	    else
2247 	        xprintf(CGETS(11, 7, "You have %smail in %s.\n"),
2248 			new ? CGETS(11, 6, "new ") : "", filename);
2249 	}
2250     }
2251     chktim = t;
2252 }
2253 
2254 /*
2255  * Extract a home directory from the password file
2256  * The argument points to a buffer where the name of the
2257  * user whose home directory is sought is currently.
2258  * We write the home directory of the user back there.
2259  */
2260 int
2261 gethdir(home)
2262     Char   *home;
2263 {
2264     Char   *h;
2265 
2266     /*
2267      * Is it us?
2268      */
2269     if (*home == '\0') {
2270 	if ((h = varval(STRhome)) != STRNULL) {
2271 	    (void) Strcpy(home, h);
2272 	    return 0;
2273 	}
2274 	else
2275 	    return 1;
2276     }
2277 
2278     /*
2279      * Look in the cache
2280      */
2281     if ((h = gettilde(home)) == NULL)
2282 	return 1;
2283     else {
2284 	(void) Strcpy(home, h);
2285 	return 0;
2286     }
2287 }
2288 
2289 /*
2290  * Move the initial descriptors to their eventual
2291  * resting places, closing all other units.
2292  */
2293 void
2294 initdesc()
2295 {
2296 #ifdef NLS_BUGS
2297 #ifdef NLS_CATALOGS
2298     (void)catclose(catd);
2299 #endif /* NLS_CATALOGS */
2300 #endif /* NLS_BUGS */
2301 
2302 
2303     didfds = 0;			/* 0, 1, 2 aren't set up */
2304     (void) close_on_exec(SHIN = dcopy(0, FSHIN), 1);
2305     (void) close_on_exec(SHOUT = dcopy(1, FSHOUT), 1);
2306     (void) close_on_exec(SHDIAG = dcopy(2, FSHDIAG), 1);
2307     (void) close_on_exec(OLDSTD = dcopy(SHIN, FOLDSTD), 1);
2308 #ifndef CLOSE_ON_EXEC
2309     didcch = 0;			/* Havent closed for child */
2310 #endif /* CLOSE_ON_EXEC */
2311     isdiagatty = isatty(SHDIAG);
2312     isoutatty = isatty(SHOUT);
2313     closem();
2314 #ifdef NLS_BUGS
2315 #ifdef NLS_CATALOGS
2316     nlsinit();
2317 #endif /* NLS_CATALOGS */
2318 #endif /* NLS_BUGS */
2319 }
2320 
2321 
2322 void
2323 #ifdef PROF
2324 done(i)
2325 #else
2326 xexit(i)
2327 #endif
2328     int     i;
2329 {
2330 #ifdef TESLA
2331     if (loginsh && do_logout) {
2332 	/* this is to send hangup signal to the develcon */
2333 	/* we toggle DTR. clear dtr - sleep 1 - set dtr */
2334 	/* ioctl will return ENOTTY for pty's but we ignore it 	 */
2335 	/* exitstat will run after disconnect */
2336 	/* we sleep for 2 seconds to let things happen in */
2337 	/* .logout and rechist() */
2338 #ifdef TIOCCDTR
2339 	(void) sleep(2);
2340 	(void) ioctl(FSHTTY, TIOCCDTR, NULL);
2341 	(void) sleep(1);
2342 	(void) ioctl(FSHTTY, TIOCSDTR, NULL);
2343 #endif /* TIOCCDTR */
2344     }
2345 #endif /* TESLA */
2346 
2347     {
2348 	struct process *pp, *np;
2349 
2350 	/* Kill all processes marked for hup'ing */
2351 	for (pp = proclist.p_next; pp; pp = pp->p_next) {
2352 	    np = pp;
2353 	    do
2354 		if ((np->p_flags & PHUP) && np->p_jobid != shpgrp) {
2355 		    if (killpg(np->p_jobid, SIGHUP) != -1) {
2356 			/* In case the job was suspended... */
2357 #ifdef SIGCONT
2358 			(void) killpg(np->p_jobid, SIGCONT);
2359 #endif
2360 			break;
2361 		    }
2362 		}
2363 	    while ((np = np->p_friends) != pp);
2364 	}
2365     }
2366     untty();
2367 #ifdef NLS_CATALOGS
2368     /*
2369      * We need to call catclose, because SVR4 leaves symlinks behind otherwise
2370      * in the catalog directories. We cannot close on a vforked() child,
2371      * because messages will stop working on the parent too.
2372      */
2373     if (child == 0)
2374 	(void) catclose(catd);
2375 #endif /* NLS_CATALOGS */
2376 #ifdef WINNT
2377     nt_cleanup();
2378 #endif /* WINNT */
2379     _exit(i);
2380 }
2381 
2382 #ifndef _PATH_DEFPATH
2383 static Char **
2384 defaultpath()
2385 {
2386     char   *ptr;
2387     Char  **blk, **blkp;
2388     struct stat stb;
2389 
2390     blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10);
2391 
2392 #ifndef NODOT
2393 # ifndef DOTLAST
2394     *blkp++ = Strsave(STRdot);
2395 # endif
2396 #endif
2397 
2398 #define DIRAPPEND(a)  \
2399 	if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \
2400 		*blkp++ = SAVE(ptr)
2401 
2402 #ifdef _PATH_LOCAL
2403     DIRAPPEND(_PATH_LOCAL);
2404 #endif
2405 
2406 #ifdef _PATH_USRUCB
2407     DIRAPPEND(_PATH_USRUCB);
2408 #endif
2409 
2410 #ifdef _PATH_USRBSD
2411     DIRAPPEND(_PATH_USRBSD);
2412 #endif
2413 
2414 #ifdef _PATH_BIN
2415     DIRAPPEND(_PATH_BIN);
2416 #endif
2417 
2418 #ifdef _PATH_USRBIN
2419     DIRAPPEND(_PATH_USRBIN);
2420 #endif
2421 
2422 #undef DIRAPPEND
2423 
2424 #ifndef NODOT
2425 # ifdef DOTLAST
2426     *blkp++ = Strsave(STRdot);
2427 # endif
2428 #endif
2429     *blkp = NULL;
2430     return (blk);
2431 }
2432 #endif
2433 
2434 static void
2435 record()
2436 {
2437     if (!fast) {
2438 	recdirs(NULL, adrof(STRsavedirs) != NULL);
2439 	rechist(NULL, adrof(STRsavehist) != NULL);
2440     }
2441 }
2442