xref: /freebsd/contrib/tcsh/sh.c (revision 6990ffd8a95caaba6858ad44ff1b3157d1efba8f)
1 /* $Header: /src/pub/tcsh/sh.c,v 3.95 2001/04/27 22:36:39 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 3.95 2001/04/27 22:36:39 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_NATIVE
90 static const char tcshstr_nt[] = "tcsh.exe";
91 #endif /* WINNT_NATIVE */
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 int	exitset = 0;
128 static time_t  chktim;		/* Time mail last checked */
129 char *progname;
130 int tcsh;
131 extern char **environ;
132 
133 /*
134  * This preserves the input state of the shell. It is used by
135  * st_save and st_restore to manupulate shell state.
136  */
137 struct saved_state {
138     int		  insource;
139     int		  SHIN;
140     int		  intty;
141     struct whyle *whyles;
142     Char 	 *gointr;
143     Char 	 *arginp;
144     Char	 *evalp;
145     Char	**evalvec;
146     Char	 *alvecp;
147     Char	**alvec;
148     int		  onelflg;
149     bool	  enterhist;
150     Char	**argv;
151     Char	  HIST;
152     bool	  cantell;
153     struct Bin	  B;
154     /* These keep signal state and setjump state */
155 #ifdef BSDSIGS
156     sigmask_t	  mask;
157 #endif
158     jmp_buf_t	  oldexit;
159     int		  reenter;
160 };
161 
162 static	int		  srccat	__P((Char *, Char *));
163 #ifndef WINNT_NATIVE
164 static	int		  srcfile	__P((char *, bool, int, Char **));
165 #else
166 int		  srcfile	__P((char *, bool, int, Char **));
167 #endif /*WINNT_NATIVE*/
168 static	sigret_t	  phup		__P((int));
169 static	void		  srcunit	__P((int, bool, int, Char **));
170 static	void		  mailchk	__P((void));
171 #ifndef _PATH_DEFPATH
172 static	Char	 	**defaultpath	__P((void));
173 #endif
174 static	void		  record	__P((void));
175 static	void		  st_save	__P((struct saved_state *, int, int,
176 					     Char **, Char **));
177 static	void		  st_restore	__P((struct saved_state *, Char **));
178 
179 	int		  main		__P((int, char **));
180 
181 int
182 main(argc, argv)
183     int     argc;
184     char  **argv;
185 {
186     register Char *cp;
187 #ifdef AUTOLOGOUT
188     register Char *cp2;
189 #endif
190     register char *tcp, *ttyn;
191     register int f;
192     register char **tempv;
193 
194 #ifdef BSDSIGS
195     sigvec_t osv;
196 #endif /* BSDSIGS */
197 
198 #ifdef WINNT_NATIVE
199     nt_init();
200 #endif /* WINNT_NATIVE */
201 #if defined(NLS_CATALOGS) && defined(LC_MESSAGES)
202     (void) setlocale(LC_MESSAGES, "");
203 #endif /* NLS_CATALOGS && LC_MESSAGES */
204 
205 #ifdef NLS
206 # ifdef LC_CTYPE
207     (void) setlocale(LC_CTYPE, ""); /* for iscntrl */
208 # endif /* LC_CTYPE */
209 #endif /* NLS */
210 
211     nlsinit();
212 
213 #ifdef MALLOC_TRACE
214      mal_setstatsfile(fdopen(dup2(open("/tmp/tcsh.trace",
215 				       O_WRONLY|O_CREAT, 0666), 25), "w"));
216      mal_trace(1);
217 #endif /* MALLOC_TRACE */
218 
219 #if !(defined(BSDTIMES) || defined(_SEQUENT_)) && defined(POSIX)
220 # ifdef _SC_CLK_TCK
221     clk_tck = (clock_t) sysconf(_SC_CLK_TCK);
222 # else /* ! _SC_CLK_TCK */
223 #  ifdef CLK_TCK
224     clk_tck = CLK_TCK;
225 #  else /* !CLK_TCK */
226     clk_tck = HZ;
227 #  endif /* CLK_TCK */
228 # endif /* _SC_CLK_TCK */
229 #endif /* !BSDTIMES && POSIX */
230 
231     settimes();			/* Immed. estab. timing base */
232 #ifdef TESLA
233     do_logout = 0;
234 #endif /* TESLA */
235 
236     /*
237      * Make sure we have 0, 1, 2 open
238      * Otherwise `` jobs will not work... (From knaff@poly.polytechnique.fr)
239      */
240     {
241 	do
242 	    if ((f = open(_PATH_DEVNULL, O_RDONLY)) == -1 &&
243 		(f = open("/", O_RDONLY)) == -1)
244 		exit(1);
245 	while (f < 3);
246 	(void) close(f);
247     }
248 
249     osinit();			/* Os dependent initialization */
250 
251 
252     {
253 	char *t;
254 
255 	t = strrchr(argv[0], '/');
256 #ifdef WINNT_NATIVE
257 	{
258 	    char *s = strrchr(argv[0], '\\');
259 	    if (s)
260 		t = s;
261 	}
262 #endif /* WINNT_NATIVE */
263 	t = t ? t + 1 : argv[0];
264 	if (*t == '-') t++;
265 	progname = strsave((t && *t) ? t : tcshstr);    /* never want a null */
266 	tcsh = strcmp(progname, tcshstr) == 0;
267     }
268 
269     /*
270      * Initialize non constant strings
271      */
272 #ifdef _PATH_BSHELL
273     STR_BSHELL = SAVE(_PATH_BSHELL);
274 #endif
275 #ifdef _PATH_TCSHELL
276     STR_SHELLPATH = SAVE(_PATH_TCSHELL);
277 #else
278 # ifdef _PATH_CSHELL
279     STR_SHELLPATH = SAVE(_PATH_CSHELL);
280 # endif
281 #endif
282     STR_environ = blk2short(environ);
283     environ = short2blk(STR_environ);	/* So that we can free it */
284     STR_WORD_CHARS = SAVE(WORD_CHARS);
285 
286     HIST = '!';
287     HISTSUB = '^';
288     PRCH = '>';
289     PRCHROOT = '#';
290     word_chars = STR_WORD_CHARS;
291     bslash_quote = 0;		/* PWP: do tcsh-style backslash quoting? */
292 
293     /* Default history size to 100 */
294     set(STRhistory, SAVE("100"), VAR_READWRITE);
295 
296     tempv = argv;
297     ffile = SAVE(tempv[0]);
298     dolzero = 0;
299     if (eq(ffile, STRaout))	/* A.out's are quittable */
300 	quitit = 1;
301     uid = getuid();
302     gid = getgid();
303     euid = geteuid();
304     egid = getegid();
305 #if defined(OREO) || defined(DT_SUPPORT)
306     /*
307      * We are a login shell if: 1. we were invoked as -<something> with
308      * optional arguments 2. or we were invoked only with the -l flag
309      */
310     loginsh = (**tempv == '-') || (argc == 2 &&
311 				   tempv[1][0] == '-' && tempv[1][1] == 'l' &&
312 						tempv[1][2] == '\0');
313 #else
314     /*
315      * We are a login shell if: 1. we were invoked as -<something> and we had
316      * no arguments 2. or we were invoked only with the -l flag
317      */
318     loginsh = (**tempv == '-' && argc == 1) || (argc == 2 &&
319 				   tempv[1][0] == '-' && tempv[1][1] == 'l' &&
320 						tempv[1][2] == '\0');
321 #endif
322 
323 #ifdef _VMS_POSIX
324     /* No better way to find if we are a login shell */
325     if (!loginsh) {
326 	loginsh = (argc == 1 && getppid() == 1);
327 	**tempv = '-';	/* Avoid giving VMS an acidic stomach */
328     }
329 #endif /* _VMS_POSIX */
330 
331     if (loginsh && **tempv != '-') {
332 	/*
333 	 * Mangle the argv space
334 	 */
335 	tempv[1][0] = '\0';
336 	tempv[1][1] = '\0';
337 	tempv[1] = NULL;
338 	for (tcp = *tempv; *tcp++;)
339 	     continue;
340 	for (tcp--; tcp >= *tempv; tcp--)
341 	    tcp[1] = tcp[0];
342 	*++tcp = '-';
343 	argc--;
344     }
345     if (loginsh) {
346 	(void) time(&chktim);
347 	set(STRloginsh, Strsave(STRNULL), VAR_READWRITE);
348     }
349 
350     AsciiOnly = 1;
351     NoNLSRebind = getenv("NOREBIND") != NULL;
352 #ifdef NLS
353 # ifdef SETLOCALEBUG
354     dont_free = 1;
355 # endif /* SETLOCALEBUG */
356     (void) setlocale(LC_ALL, "");
357 # ifdef LC_COLLATE
358     (void) setlocale(LC_COLLATE, "");
359 # endif
360 # ifdef SETLOCALEBUG
361     dont_free = 0;
362 # endif /* SETLOCALEBUG */
363 # ifdef STRCOLLBUG
364     fix_strcoll_bug();
365 # endif /* STRCOLLBUG */
366 
367     {
368 	int     k;
369 
370 	for (k = 0200; k <= 0377 && !Isprint(k); k++)
371 	    continue;
372 	AsciiOnly = k > 0377;
373     }
374 #else
375     AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL;
376 #endif				/* NLS */
377     if (MapsAreInited && !NLSMapsAreInited)
378 	ed_InitNLSMaps();
379     ResetArrowKeys();
380 
381     /*
382      * Initialize for periodic command intervals. Also, initialize the dummy
383      * tty list for login-watch.
384      */
385     (void) time(&t_period);
386 #ifndef HAVENOUTMP
387     initwatch();
388 #endif /* !HAVENOUTMP */
389 
390 #if defined(alliant)
391     /*
392      * From:  Jim Pace <jdp@research.att.com>
393      * tcsh does not work properly on the alliants through an rlogin session.
394      * The shell generally hangs.  Also, reference to the controlling terminal
395      * does not work ( ie: echo foo > /dev/tty ).
396      *
397      * A security feature was added to rlogind affecting FX/80's Concentrix
398      * from revision 5.5.xx upwards (through 5.7 where this fix was implemented)
399      * This security change also affects the FX/2800 series.
400      * The security change to rlogind requires the process group of an rlogin
401      * session become disassociated with the tty in rlogind.
402      *
403      * The changes needed are:
404      * 1. set the process group
405      * 2. reenable the control terminal
406      */
407      if (loginsh && isatty(SHIN)) {
408 	 ttyn = (char *) ttyname(SHIN);
409 	 (void) close(SHIN);
410 	 SHIN = open(ttyn, O_RDWR);
411 	 shpgrp = getpid();
412 	 (void) ioctl (SHIN, TIOCSPGRP, (ioctl_t) &shpgrp);
413 	 (void) setpgid(0, shpgrp);
414      }
415 #endif /* alliant */
416 
417     /*
418      * Move the descriptors to safe places. The variable didfds is 0 while we
419      * have only FSH* to work with. When didfds is true, we have 0,1,2 and
420      * prefer to use these.
421      */
422     initdesc();
423 
424     /*
425      * Get and set the tty now
426      */
427     if ((ttyn = ttyname(SHIN)) != NULL) {
428 	/*
429 	 * Could use rindex to get rid of other possible path components, but
430 	 * hpux preserves the subdirectory /pty/ when storing the tty name in
431 	 * utmp, so we keep it too.
432 	 */
433 	if (strncmp(ttyn, "/dev/", 5) == 0)
434 	    set(STRtty, cp = SAVE(ttyn + 5), VAR_READWRITE);
435 	else
436 	    set(STRtty, cp = SAVE(ttyn), VAR_READWRITE);
437     }
438     else
439 	set(STRtty, cp = SAVE(""), VAR_READWRITE);
440     /*
441      * Initialize the shell variables. ARGV and PROMPT are initialized later.
442      * STATUS is also munged in several places. CHILD is munged when
443      * forking/waiting
444      */
445 
446     /*
447      * 7-10-87 Paul Placeway autologout should be set ONLY on login shells and
448      * on shells running as root.  Out of these, autologout should NOT be set
449      * for any psudo-terminals (this catches most window systems) and not for
450      * any terminal running X windows.
451      *
452      * At Ohio State, we have had problems with a user having his X session
453      * drop out from under him (on a Sun) because the shell in his master
454      * xterm timed out and exited.
455      *
456      * Really, this should be done with a program external to the shell, that
457      * watches for no activity (and NO running programs, such as dump) on a
458      * terminal for a long peroid of time, and then SIGHUPS the shell on that
459      * terminal.
460      *
461      * bugfix by Rich Salz <rsalz@PINEAPPLE.BBN.COM>: For root rsh things
462      * allways first check to see if loginsh or really root, then do things
463      * with ttyname()
464      *
465      * Also by Jean-Francois Lamy <lamy%ai.toronto.edu@RELAY.CS.NET>: check the
466      * value of cp before using it! ("root can rsh too")
467      *
468      * PWP: keep the nested ifs; the order of the tests matters and a good
469      * (smart) C compiler might re-arange things wrong.
470      */
471 #ifdef AUTOLOGOUT
472 # ifdef convex
473     if (uid == 0) {
474 	/*  root always has a 15 minute autologout  */
475 	set(STRautologout, Strsave(STRrootdefautologout), VAR_READWRITE);
476     }
477     else
478 	if (loginsh)
479 	    /*  users get autologout set to 0  */
480 	    set(STRautologout, Strsave(STR0), VAR_READWRITE);
481 # else /* convex */
482     if (loginsh || (uid == 0)) {
483 	if (*cp) {
484 	    /* only for login shells or root and we must have a tty */
485 	    if ((cp2 = Strrchr(cp, (Char) '/')) != NULL) {
486 		cp = cp2 + 1;
487 	    }
488 	    else
489 		cp2 = cp;
490 	    if (!(((Strncmp(cp2, STRtty, 3) == 0) && Isalpha(cp2[3])) ||
491 		  ((Strncmp(cp, STRpts, 3) == 0) && cp[3] == '/'))) {
492 		if (getenv("DISPLAY") == NULL) {
493 		    /* NOT on X window shells */
494 		    set(STRautologout, Strsave(STRdefautologout),
495 			VAR_READWRITE);
496 		}
497 	    }
498 	}
499     }
500 # endif /* convex */
501 #endif /* AUTOLOGOUT */
502 
503     (void) sigset(SIGALRM, alrmcatch);
504 
505     set(STRstatus, Strsave(STR0), VAR_READWRITE);
506 
507     /*
508      * get and set machine specific envirnment variables
509      */
510     getmachine();
511 
512     fix_version();		/* publish the shell version */
513 
514     /*
515      * Publish the selected echo style
516      */
517 #if ECHO_STYLE == NONE_ECHO
518     set(STRecho_style, Strsave(STRnone), VAR_READWRITE);
519 #endif /* ECHO_STYLE == NONE_ECHO */
520 #if ECHO_STYLE == BSD_ECHO
521     set(STRecho_style, Strsave(STRbsd), VAR_READWRITE);
522 #endif /* ECHO_STYLE == BSD_ECHO */
523 #if ECHO_STYLE == SYSV_ECHO
524     set(STRecho_style, Strsave(STRsysv), VAR_READWRITE);
525 #endif /* ECHO_STYLE == SYSV_ECHO */
526 #if ECHO_STYLE == BOTH_ECHO
527     set(STRecho_style, Strsave(STRboth), VAR_READWRITE);
528 #endif /* ECHO_STYLE == BOTH_ECHO */
529 
530     /*
531      * increment the shell level.
532      */
533     shlvl(1);
534 
535     if ((tcp = getenv("HOME")) != NULL) {
536 	if (strlen(tcp) >= MAXPATHLEN) {
537 	    struct passwd *pw;
538 	    if ((pw = getpwuid(getuid())) != NULL)
539 		cp = quote(SAVE(pw->pw_dir));
540 	    else {
541 		tcp[MAXPATHLEN-1] = '\0';
542 		cp = quote(SAVE(tcp));
543 	    }
544 	} else {
545 	    cp = quote(SAVE(tcp));
546 	}
547     } else
548 	cp = NULL;
549 
550     if (cp == NULL)
551 	fast = 1;		/* No home -> can't read scripts */
552     else
553 	set(STRhome, cp, VAR_READWRITE);
554 
555     dinit(cp);			/* dinit thinks that HOME == cwd in a login
556 				 * shell */
557     /*
558      * Grab other useful things from the environment. Should we grab
559      * everything??
560      */
561     {
562 	char *cln, *cus, *cgr;
563 	Char    buff[BUFSIZE];
564 	struct passwd *pw;
565 	struct group *gr;
566 
567 
568 #ifdef apollo
569 	int     oid = getoid();
570 
571 	(void) Itoa(oid, buff, 0, 0);
572 	set(STRoid, Strsave(buff), VAR_READWRITE);
573 #endif /* apollo */
574 
575 	(void) Itoa(uid, buff, 0, 0);
576 	set(STRuid, Strsave(buff), VAR_READWRITE);
577 
578 	(void) Itoa(gid, buff, 0, 0);
579 	set(STRgid, Strsave(buff), VAR_READWRITE);
580 
581 	cln = getenv("LOGNAME");
582 	cus = getenv("USER");
583 	if (cus != NULL)
584 	    set(STRuser, quote(SAVE(cus)), VAR_READWRITE);
585 	else if (cln != NULL)
586 	    set(STRuser, quote(SAVE(cln)), VAR_READWRITE);
587 	else if ((pw = getpwuid(uid)) == NULL)
588 	    set(STRuser, SAVE("unknown"), VAR_READWRITE);
589 	else
590 	    set(STRuser, SAVE(pw->pw_name), VAR_READWRITE);
591 	if (cln == NULL)
592 	    tsetenv(STRLOGNAME, varval(STRuser));
593 	if (cus == NULL)
594 	    tsetenv(STRKUSER, varval(STRuser));
595 
596 	cgr = getenv("GROUP");
597 	if (cgr != NULL)
598 	    set(STRgroup, quote(SAVE(cgr)), VAR_READWRITE);
599 	else if ((gr = getgrgid(gid)) == NULL)
600 	    set(STRgroup, SAVE("unknown"), VAR_READWRITE);
601 	else
602 	    set(STRgroup, SAVE(gr->gr_name), VAR_READWRITE);
603 	if (cgr == NULL)
604 	    tsetenv(STRKGROUP, varval(STRgroup));
605     }
606 
607     /*
608      * HOST may be wrong, since rexd transports the entire environment on sun
609      * 3.x Just set it again
610      */
611     {
612 	char    cbuff[MAXHOSTNAMELEN];
613 
614 	if (gethostname(cbuff, sizeof(cbuff)) >= 0) {
615 	    cbuff[sizeof(cbuff) - 1] = '\0';	/* just in case */
616 	    tsetenv(STRHOST, str2short(cbuff));
617 	}
618 	else
619 	    tsetenv(STRHOST, str2short("unknown"));
620     }
621 
622 
623 #ifdef REMOTEHOST
624     /*
625      * Try to determine the remote host we were logged in from.
626      */
627     remotehost();
628 #endif /* REMOTEHOST */
629 
630 #ifdef apollo
631     if ((tcp = getenv("SYSTYPE")) == NULL)
632 	tcp = "bsd4.3";
633     tsetenv(STRSYSTYPE, quote(str2short(tcp)));
634 #endif /* apollo */
635 
636     /*
637      * set editing on by default, unless running under Emacs as an inferior
638      * shell.
639      * We try to do this intelligently. If $TERM is available, then it
640      * should determine if we should edit or not. $TERM is preserved
641      * across rlogin sessions, so we will not get confused if we rlogin
642      * under an emacs shell. Another advantage is that if we run an
643      * xterm under an emacs shell, then the $TERM will be set to
644      * xterm, so we are going to want to edit. Unfortunately emacs
645      * does not restore all the tty modes, so xterm is not very well
646      * set up. But this is not the shell's fault.
647      * Also don't edit if $TERM == wm, for when we're running under an ATK app.
648      * Finally, emacs compiled under terminfo, sets the terminal to dumb,
649      * so disable editing for that too.
650      *
651      * Unfortunately, in some cases the initial $TERM setting is "unknown",
652      * "dumb", or "network" which is then changed in the user's startup files.
653      * We fix this by setting noediting here if $TERM is unknown/dumb and
654      * if noediting is set, we switch on editing if $TERM is changed.
655      */
656     if ((tcp = getenv("TERM")) != NULL) {
657 	set(STRterm, quote(SAVE(tcp)), VAR_READWRITE);
658 	noediting = strcmp(tcp, "unknown") == 0 || strcmp(tcp, "dumb") == 0 ||
659 		    strcmp(tcp, "network") == 0;
660 	editing = strcmp(tcp, "emacs") != 0 && strcmp(tcp, "wm") != 0 &&
661 		  !noediting;
662     }
663     else {
664 	noediting = 0;
665 	editing = ((tcp = getenv("EMACS")) == NULL || strcmp(tcp, "t") != 0);
666     }
667 
668     /*
669      * The 'edit' variable is either set or unset.  It doesn't
670      * need a value.  Making it 'emacs' might be confusing.
671      */
672     if (editing)
673 	set(STRedit, Strsave(STRNULL), VAR_READWRITE);
674 
675 
676     /*
677      * still more mutability: make the complete routine automatically add the
678      * suffix of file names...
679      */
680     set(STRaddsuffix, Strsave(STRNULL), VAR_READWRITE);
681 
682     /*
683      * Random default kill ring size
684      */
685     set(STRkillring, SAVE("30"), VAR_READWRITE);
686 
687     /*
688      * Re-initialize path if set in environment
689      */
690     if ((tcp = getenv("PATH")) == NULL)
691 #ifdef _PATH_DEFPATH
692 	importpath(str2short(_PATH_DEFPATH));
693 #else /* !_PATH_DEFPATH */
694 	setq(STRpath, defaultpath(), &shvhed, VAR_READWRITE);
695 #endif /* _PATH_DEFPATH */
696     else
697 	/* Importpath() allocates memory for the path, and the
698 	 * returned pointer from SAVE() was discarded, so
699 	 * this was a memory leak.. (sg)
700 	 *
701 	 * importpath(SAVE(tcp));
702 	 */
703 	importpath(str2short(tcp));
704 
705 
706     {
707 	/* If the SHELL environment variable ends with "tcsh", set
708 	 * STRshell to the same path.  This is to facilitate using
709 	 * the executable in environments where the compiled-in
710 	 * default isn't appropriate (sg).
711 	 */
712 
713 	int sh_len = 0;
714 
715 	if ((tcp = getenv("SHELL")) != NULL) {
716 	    sh_len = strlen(tcp);
717 	    if ((sh_len >= 5 && strcmp(tcp + (sh_len - 5), "/tcsh") == 0) ||
718 	        (!tcsh && sh_len >= 4 && strcmp(tcp + (sh_len - 4), "/csh") == 0))
719 		set(STRshell, quote(SAVE(tcp)), VAR_READWRITE);
720 	    else
721 		sh_len = 0;
722 	}
723 	if (sh_len == 0)
724 	    set(STRshell, Strsave(STR_SHELLPATH), VAR_READWRITE);
725     }
726 
727 #ifdef COLOR_LS_F
728     if ((tcp = getenv("LS_COLORS")) != NULL)
729 	parseLS_COLORS(str2short(tcp));
730 #endif /* COLOR_LS_F */
731 
732     doldol = putn((int) getpid());	/* For $$ */
733 #ifdef WINNT_NATIVE
734     {
735 	char *strtmp1, strtmp2[MAXPATHLEN];
736 	if ((strtmp1 = getenv("TMP")) != NULL)
737 	    wsprintf(strtmp2, "%s/%s", strtmp1, "sh");
738 	shtemp = Strspl(SAVE(strtmp2), doldol);	/* For << */
739     }
740 #else /* !WINNT_NATIVE */
741     shtemp = Strspl(STRtmpsh, doldol);	/* For << */
742 #endif /* WINNT_NATIVE */
743 
744     /*
745      * Record the interrupt states from the parent process. If the parent is
746      * non-interruptible our hand must be forced or we (and our children) won't
747      * be either. Our children inherit termination from our parent. We catch it
748      * only if we are the login shell.
749      */
750 #ifdef BSDSIGS
751     /*
752      * PURIFY-2 claims that osv does not get
753      * initialized after the sigvec call
754      */
755     setzero((char*) &osv, sizeof(osv));
756     /* parents interruptibility */
757     (void) mysigvec(SIGINT, NULL, &osv);
758     parintr = (signalfun_t) osv.sv_handler;
759     (void) mysigvec(SIGTERM, NULL, &osv);
760     parterm = (signalfun_t) osv.sv_handler;
761 #else				/* BSDSIGS */
762     parintr = signal(SIGINT, SIG_IGN);	/* parents interruptibility */
763     (void) sigset(SIGINT, parintr);	/* ... restore */
764 
765 # ifdef COHERENT
766     if (loginsh) /* it seems that SIGTERM is always set to SIG_IGN by */
767                  /* init/getty so it should be set to SIG_DFL - there may be */
768                  /* a better fix for this. */
769          parterm = SIG_DFL;
770     else
771 # else /* !COHERENT */
772     parterm = signal(SIGTERM, SIG_IGN);	/* parents terminability */
773 # endif /* COHERENT */
774     (void) sigset(SIGTERM, parterm);	/* ... restore */
775 
776 #endif /* BSDSIGS */
777 
778 
779 #ifdef TCF
780     /* Enable process migration on ourselves and our progeny */
781     (void) signal(SIGMIGRATE, SIG_DFL);
782 #endif /* TCF */
783 
784     /*
785      * dspkanji/dspmbyte autosetting
786      */
787     /* PATCH IDEA FROM Issei.Suzuki VERY THANKS */
788 #if defined(DSPMBYTE)
789 #if defined(NLS) && defined(LC_CTYPE)
790     if (((tcp = setlocale(LC_CTYPE, NULL)) != NULL || (tcp = getenv("LANG")) != NULL) && !adrof(CHECK_MBYTEVAR)) {
791 #else
792     if ((tcp = getenv("LANG")) != NULL && !adrof(CHECK_MBYTEVAR)) {
793 #endif
794 	autoset_dspmbyte(str2short(tcp));
795     }
796 #if defined(WINNT_NATIVE)
797     else if (!adrof(CHECK_MBYTEVAR))
798       nt_autoset_dspmbyte();
799 #endif /* WINNT_NATIVE */
800 #endif
801 
802     /*
803      * Process the arguments.
804      *
805      * Note that processing of -v/-x is actually delayed till after script
806      * processing.
807      *
808      * We set the first character of our name to be '-' if we are a shell
809      * running interruptible commands.  Many programs which examine ps'es
810      * use this to filter such shells out.
811      */
812     argc--, tempv++;
813     while (argc > 0 && (tcp = tempv[0])[0] == '-' &&
814 	   *++tcp != '\0' && !batch) {
815 	do
816 	    switch (*tcp++) {
817 
818 	    case 0:		/* -	Interruptible, no prompt */
819 		prompt = 0;
820 		setintr = 1;
821 		nofile = 1;
822 		break;
823 
824 	    case 'b':		/* -b	Next arg is input file */
825 		batch = 1;
826 		break;
827 
828 	    case 'c':		/* -c	Command input from arg */
829 		if (argc == 1)
830 		    xexit(0);
831 		argc--, tempv++;
832 #ifdef M_XENIX
833 		/* Xenix Vi bug:
834 		   it relies on a 7 bit environment (/bin/sh), so it
835 		   pass ascii arguments with the 8th bit set */
836 		if (!strcmp(argv[0], "sh"))
837 		  {
838 		    char *p;
839 
840 		    for (p = tempv[0]; *p; ++p)
841 		      *p &= ASCII;
842 		  }
843 #endif
844 		arginp = SAVE(tempv[0]);
845 
846 		/*
847 		 * we put the command into a variable
848 		 */
849 		if (arginp != NULL)
850 		  set(STRcommand, quote(Strsave(arginp)), VAR_READWRITE);
851 
852 		/*
853 		 * * Give an error on -c arguments that end in * backslash to
854 		 * ensure that you don't make * nonportable csh scripts.
855 		 */
856 		{
857 		    register int count;
858 
859 		    cp = arginp + Strlen(arginp);
860 		    count = 0;
861 		    while (cp > arginp && *--cp == '\\')
862 			++count;
863 		    if ((count & 1) != 0) {
864 			exiterr = 1;
865 			stderror(ERR_ARGC);
866 		    }
867 		}
868 		prompt = 0;
869 		nofile = 1;
870 		break;
871 	    case 'd':		/* -d	Load directory stack from file */
872 		rdirs = 1;
873 		break;
874 
875 #ifdef apollo
876 	    case 'D':		/* -D	Define environment variable */
877 		{
878 		    register Char *dp;
879 
880 		    cp = str2short(tcp);
881 		    if (dp = Strchr(cp, '=')) {
882 			*dp++ = '\0';
883 			tsetenv(cp, dp);
884 		    }
885 		    else
886 			tsetenv(cp, STRNULL);
887 		}
888 		*tcp = '\0'; 	/* done with this argument */
889 		break;
890 #endif /* apollo */
891 
892 	    case 'e':		/* -e	Exit on any error */
893 		exiterr = 1;
894 		break;
895 
896 	    case 'f':		/* -f	Fast start */
897 		fast = 1;
898 		break;
899 
900 	    case 'i':		/* -i	Interactive, even if !intty */
901 		intact = 1;
902 		nofile = 1;
903 		break;
904 
905 	    case 'm':		/* -m	read .cshrc (from su) */
906 		mflag = 1;
907 		break;
908 
909 	    case 'n':		/* -n	Don't execute */
910 		noexec = 1;
911 		break;
912 
913 	    case 'q':		/* -q	(Undoc'd) ... die on quit */
914 		quitit = 1;
915 		break;
916 
917 	    case 's':		/* -s	Read from std input */
918 		nofile = 1;
919 		break;
920 
921 	    case 't':		/* -t	Read one line from input */
922 		onelflg = 2;
923 		prompt = 0;
924 		nofile = 1;
925 		break;
926 
927 	    case 'v':		/* -v	Echo hist expanded input */
928 		nverbose = 1;	/* ... later */
929 		break;
930 
931 	    case 'x':		/* -x	Echo just before execution */
932 		nexececho = 1;	/* ... later */
933 		break;
934 
935 	    case 'V':		/* -V	Echo hist expanded input */
936 		setNS(STRverbose);	/* NOW! */
937 		break;
938 
939 	    case 'X':		/* -X	Echo just before execution */
940 		setNS(STRecho);	/* NOW! */
941 		break;
942 
943 	    case 'F':		/* Undocumented flag */
944 		/*
945 		 * This will cause children to be created using fork instead of
946 		 * vfork.
947 		 */
948 		use_fork = 1;
949 		break;
950 
951 	    case ' ':
952 	    case '\t':
953 		/*
954 		 * for O/S's that don't do the argument parsing right in
955 		 * "#!/foo -f " scripts
956 		 */
957 		break;
958 
959 	    default:		/* Unknown command option */
960 		exiterr = 1;
961 		stderror(ERR_TCSHUSAGE, tcp-1, progname);
962 		break;
963 
964 	} while (*tcp);
965 	tempv++, argc--;
966     }
967 
968     if (quitit)			/* With all due haste, for debugging */
969 	(void) signal(SIGQUIT, SIG_DFL);
970 
971     /*
972      * Unless prevented by -, -c, -i, -s, or -t, if there are remaining
973      * arguments the first of them is the name of a shell file from which to
974      * read commands.
975      */
976     if (nofile == 0 && argc > 0) {
977 	nofile = open(tempv[0], O_RDONLY);
978 	if (nofile < 0) {
979 	    child = 1;		/* So this ... */
980 	    /* ... doesn't return */
981 	    stderror(ERR_SYSTEM, tempv[0], strerror(errno));
982 	}
983 	if (ffile != NULL)
984 	    xfree((ptr_t) ffile);
985 	dolzero = 1;
986 	ffile = SAVE(tempv[0]);
987 	/*
988 	 * Replace FSHIN. Handle /dev/std{in,out,err} specially
989 	 * since once they are closed we cannot open them again.
990 	 * In that case we use our own saved descriptors
991 	 */
992 	if ((SHIN = dmove(nofile, FSHIN)) < 0)
993 	    switch(nofile) {
994 	    case 0:
995 		SHIN = FSHIN;
996 		break;
997 	    case 1:
998 		SHIN = FSHOUT;
999 		break;
1000 	    case 2:
1001 		SHIN = FSHDIAG;
1002 		break;
1003 	    default:
1004 		stderror(ERR_SYSTEM, tempv[0], strerror(errno));
1005 		break;
1006 	    }
1007 	(void) close_on_exec(SHIN, 1);
1008 	prompt = 0;
1009 	 /* argc not used any more */ tempv++;
1010     }
1011 
1012 
1013     /*
1014      * Consider input a tty if it really is or we are interactive. but not for
1015      * editing (christos)
1016      */
1017     if (!(intty = isatty(SHIN))) {
1018 	if (adrof(STRedit))
1019 	    unsetv(STRedit);
1020 	editing = 0;
1021     }
1022     intty |= intact;
1023 #ifndef convex
1024     if (intty || (intact && isatty(SHOUT))) {
1025 	if (!batch && (uid != euid || gid != egid)) {
1026 	    errno = EACCES;
1027 	    child = 1;		/* So this ... */
1028 	    /* ... doesn't return */
1029 	    stderror(ERR_SYSTEM, progname, strerror(errno));
1030 	}
1031     }
1032 #endif /* convex */
1033     isoutatty = isatty(SHOUT);
1034     isdiagatty = isatty(SHDIAG);
1035     /*
1036      * Decide whether we should play with signals or not. If we are explicitly
1037      * told (via -i, or -) or we are a login shell (arg0 starts with -) or the
1038      * input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx")
1039      * Note that in only the login shell is it likely that parent may have set
1040      * signals to be ignored
1041      */
1042     if (loginsh || intact || (intty && isatty(SHOUT)))
1043 	setintr = 1;
1044     settell();
1045     /*
1046      * Save the remaining arguments in argv.
1047      */
1048     setq(STRargv, blk2short(tempv), &shvhed, VAR_READWRITE);
1049 
1050     /*
1051      * Set up the prompt.
1052      */
1053     if (prompt) {
1054 	if (tcsh)
1055 	    set(STRprompt, Strsave(STRdeftcshprompt), VAR_READWRITE);
1056 	else
1057 	    set(STRprompt, Strsave(STRdefcshprompt), VAR_READWRITE);
1058 	/* that's a meta-questionmark */
1059 	set(STRprompt2, Strsave(STRmquestion), VAR_READWRITE);
1060 	set(STRprompt3, Strsave(STRKCORRECT), VAR_READWRITE);
1061     }
1062 
1063     /*
1064      * If we are an interactive shell, then start fiddling with the signals;
1065      * this is a tricky game.
1066      */
1067     shpgrp = mygetpgrp();
1068     opgrp = tpgrp = -1;
1069     if (setintr) {
1070 	signalfun_t osig;
1071 	**argv = '-';
1072 	if (!quitit)		/* Wary! */
1073 	    (void) signal(SIGQUIT, SIG_IGN);
1074 	(void) sigset(SIGINT, pintr);
1075 	(void) sighold(SIGINT);
1076 	(void) signal(SIGTERM, SIG_IGN);
1077 
1078 	/*
1079 	 * No reason I can see not to save history on all these events..
1080 	 * Most usual occurrence is in a window system, where we're not a login
1081 	 * shell, but might as well be... (sg)
1082 	 * But there might be races when lots of shells exit together...
1083 	 * [this is also incompatible].
1084 	 * We have to be mre careful here. If the parent wants to
1085 	 * ignore the signals then we leave them untouched...
1086 	 * We also only setup the handlers for shells that are trully
1087 	 * interactive.
1088 	 */
1089 	osig = signal(SIGHUP, phup);	/* exit processing on HUP */
1090 	if (!loginsh && osig == SIG_IGN)
1091 	    (void) signal(SIGHUP, osig);
1092 #ifdef SIGXCPU
1093 	osig = signal(SIGXCPU, phup);	/* exit processing on XCPU */
1094 	if (!loginsh && osig == SIG_IGN)
1095 	    (void) signal(SIGXCPU, osig);
1096 #endif
1097 #ifdef SIGXFSZ
1098 	osig = signal(SIGXFSZ, phup);	/* exit processing on XFSZ */
1099 	if (!loginsh && osig == SIG_IGN)
1100 	    (void) signal(SIGXFSZ, osig);
1101 #endif
1102 
1103 	if (quitit == 0 && arginp == 0) {
1104 #ifdef SIGTSTP
1105 	    (void) signal(SIGTSTP, SIG_IGN);
1106 #endif
1107 #ifdef SIGTTIN
1108 	    (void) signal(SIGTTIN, SIG_IGN);
1109 #endif
1110 #ifdef SIGTTOU
1111 	    (void) signal(SIGTTOU, SIG_IGN);
1112 #endif
1113 	    /*
1114 	     * Wait till in foreground, in case someone stupidly runs csh &
1115 	     * dont want to try to grab away the tty.
1116 	     */
1117 	    if (isatty(FSHDIAG))
1118 		f = FSHDIAG;
1119 	    else if (isatty(FSHOUT))
1120 		f = FSHOUT;
1121 	    else if (isatty(OLDSTD))
1122 		f = OLDSTD;
1123 	    else
1124 		f = -1;
1125 
1126 #ifdef NeXT
1127 	    /* NeXT 2.0 /usr/etc/rlogind, does not set our process group! */
1128 	    if (shpgrp == 0) {
1129 	        shpgrp = getpid();
1130 		(void) setpgid(0, shpgrp);
1131 	        (void) tcsetpgrp(f, shpgrp);
1132 	    }
1133 #endif /* NeXT */
1134 #ifdef BSDJOBS			/* if we have tty job control */
1135     retry:
1136 	    if ((tpgrp = tcgetpgrp(f)) != -1) {
1137 		if (tpgrp != shpgrp) {
1138 		    signalfun_t old = signal(SIGTTIN, SIG_DFL);
1139 		    (void) kill(0, SIGTTIN);
1140 		    (void) signal(SIGTTIN, old);
1141 		    goto retry;
1142 		}
1143 		/*
1144 		 * Thanks to Matt Day for the POSIX references, and to
1145 		 * Paul Close for the SGI clarification.
1146 		 */
1147 		if (setdisc(f) != -1) {
1148 		    opgrp = shpgrp;
1149 		    shpgrp = getpid();
1150 		    tpgrp = shpgrp;
1151 		    if (tcsetpgrp(f, shpgrp) == -1) {
1152 			/*
1153 			 * On hpux 7.03 this fails with EPERM. This happens on
1154 			 * the 800 when opgrp != shpgrp at this point. (we were
1155 			 * forked from a non job control shell)
1156 			 * POSIX 7.2.4, says we failed because the process
1157 			 * group specified did not belong to a process
1158 			 * in the same session with the tty. So we set our
1159 			 * process group and try again.
1160 			 */
1161 			if (setpgid(0, shpgrp) == -1) {
1162 			    xprintf("setpgid:");
1163 			    goto notty;
1164 			}
1165 			if (tcsetpgrp(f, shpgrp) == -1) {
1166 			    xprintf("tcsetpgrp:");
1167 			    goto notty;
1168 			}
1169 		    }
1170 		    /*
1171 		     * We check the process group now. If it is the same, then
1172 		     * we don't need to set it again. On hpux 7.0 on the 300's
1173 		     * if we set it again it fails with EPERM. This is the
1174 		     * correct behavior according to POSIX 4.3.3 if the process
1175 		     * was a session leader .
1176 		     */
1177 		    else if (shpgrp != mygetpgrp()) {
1178 			if(setpgid(0, shpgrp) == -1) {
1179 			    xprintf("setpgid:");
1180 			    goto notty;
1181 			}
1182 		    }
1183 #ifdef IRIS4D
1184 		    /*
1185 		     * But on irix 3.3 we need to set it again, even if it is
1186 		     * the same. We do that to tell the system that we
1187 		     * need BSD process group compatibility.
1188 		     */
1189 		    else
1190 			(void) setpgid(0, shpgrp);
1191 #endif
1192 		    (void) close_on_exec(dcopy(f, FSHTTY), 1);
1193 		}
1194 		else
1195 		    tpgrp = -1;
1196 	    }
1197 	    if (tpgrp == -1) {
1198 	notty:
1199 		xprintf(CGETS(11, 1, "Warning: no access to tty (%s).\n"),
1200 			strerror(errno));
1201 		xprintf(CGETS(11, 2, "Thus no job control in this shell.\n"));
1202 		/*
1203 		 * Fix from:Sakari Jalovaara <sja@sirius.hut.fi> if we don't
1204 		 * have access to tty, disable editing too
1205 		 */
1206 		if (adrof(STRedit))
1207 		    unsetv(STRedit);
1208 		editing = 0;
1209 	    }
1210 #else	/* BSDJOBS */		/* don't have job control, so frotz it */
1211 	    tpgrp = -1;
1212 #endif				/* BSDJOBS */
1213 	}
1214     }
1215     if ((setintr == 0) && (parintr == SIG_DFL))
1216 	setintr = 1;
1217 
1218 /*
1219  * SVR4 doesn't send a SIGCHLD when a child is stopped or continued if the
1220  * handler is installed with signal(2) or sigset(2).  sigaction(2) must
1221  * be used instead.
1222  *
1223  * David Dawes (dawes@physics.su.oz.au) Sept 1991
1224  */
1225 
1226 #if SYSVREL > 3
1227     {
1228 	struct sigaction act;
1229         act.sa_handler=pchild;
1230 	(void) sigemptyset(&(act.sa_mask));	/* Don't block any extra sigs
1231 						 * when the handler is called
1232 						 */
1233         act.sa_flags=0;	           /* want behaviour of sigset() without
1234                                     * SA_NOCLDSTOP
1235 				    */
1236 
1237         if ((sigaction(SIGCHLD,&act,(struct sigaction *)NULL)) == -1)
1238 	    stderror(ERR_SYSTEM, "sigaction", strerror(errno));
1239     }
1240 #else /* SYSVREL <= 3 */
1241     (void) sigset(SIGCHLD, pchild);	/* while signals not ready */
1242 #endif /* SYSVREL <= 3 */
1243 
1244 
1245     if (intty && !arginp)
1246 	(void) ed_Setup(editing);/* Get the tty state, and set defaults */
1247 				 /* Only alter the tty state if editing */
1248 
1249     /*
1250      * Set an exit here in case of an interrupt or error reading the shell
1251      * start-up scripts.
1252      */
1253     reenter = setexit();	/* PWP */
1254     exitset++;
1255     haderr = 0;			/* In case second time through */
1256     if (!fast && reenter == 0) {
1257 	/* Will have varval(STRhome) here because set fast if don't */
1258 	{
1259 	    int     osetintr = setintr;
1260 	    signalfun_t oparintr = parintr;
1261 
1262 #ifdef BSDSIGS
1263 	    sigmask_t omask = sigblock(sigmask(SIGINT));
1264 #else
1265 	    (void) sighold(SIGINT);
1266 #endif
1267 	    setintr = 0;
1268 	    parintr = SIG_IGN;	/* onintr in /etc/ files has no effect */
1269 #ifdef LOGINFIRST
1270 #ifdef _PATH_DOTLOGIN
1271 	    if (loginsh)
1272 	      (void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL);
1273 #endif
1274 #endif
1275 
1276 #ifdef _PATH_DOTCSHRC
1277 	    (void) srcfile(_PATH_DOTCSHRC, 0, 0, NULL);
1278 #endif
1279 	    if (!arginp && !onelflg && !havhash)
1280 		dohash(NULL,NULL);
1281 #ifndef LOGINFIRST
1282 #ifdef _PATH_DOTLOGIN
1283 	    if (loginsh)
1284 		(void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL);
1285 #endif
1286 #endif
1287 #ifdef BSDSIGS
1288 	    (void) sigsetmask(omask);
1289 #else
1290 	    (void) sigrelse(SIGINT);
1291 #endif
1292 	    setintr = osetintr;
1293 	    parintr = oparintr;
1294 	}
1295 #ifdef LOGINFIRST
1296 	if (loginsh)
1297 	    (void) srccat(varval(STRhome), STRsldotlogin);
1298 #endif
1299 	/* upward compat. */
1300 	if (!srccat(varval(STRhome), STRsldottcshrc))
1301 	    (void) srccat(varval(STRhome), STRsldotcshrc);
1302 
1303 	if (!fast && !arginp && !onelflg && !havhash)
1304 	    dohash(NULL,NULL);
1305 
1306 	/*
1307 	 * Source history before .login so that it is available in .login
1308 	 */
1309 	loadhist(NULL, 0);
1310 #ifndef LOGINFIRST
1311 	if (loginsh)
1312 	    (void) srccat(varval(STRhome), STRsldotlogin);
1313 #endif
1314 	if (!fast && (loginsh || rdirs))
1315 	    loaddirs(NULL);
1316     }
1317     /* Initing AFTER .cshrc is the Right Way */
1318     if (intty && !arginp) {	/* PWP setup stuff */
1319 	ed_Init();		/* init the new line editor */
1320 #ifdef SIG_WINDOW
1321 	check_window_size(1);	/* mung environment */
1322 #endif				/* SIG_WINDOW */
1323     }
1324 
1325     /*
1326      * Now are ready for the -v and -x flags
1327      */
1328     if (nverbose)
1329 	setNS(STRverbose);
1330     if (nexececho)
1331 	setNS(STRecho);
1332 
1333     /*
1334      * All the rest of the world is inside this call. The argument to process
1335      * indicates whether it should catch "error unwinds".  Thus if we are a
1336      * interactive shell our call here will never return by being blown past on
1337      * an error.
1338      */
1339     process(setintr);
1340 
1341     /*
1342      * Mop-up.
1343      */
1344     if (intty) {
1345 	if (loginsh) {
1346 	    xprintf("logout\n");
1347 	    (void) close(SHIN);
1348 	    child = 1;
1349 #ifdef TESLA
1350 	    do_logout = 1;
1351 #endif				/* TESLA */
1352 	    goodbye(NULL, NULL);
1353 	}
1354 	else {
1355 	    xprintf("exit\n");
1356 	}
1357     }
1358     record();
1359     exitstat();
1360     return (0);
1361 }
1362 
1363 void
1364 untty()
1365 {
1366 #ifdef BSDJOBS
1367     if (tpgrp > 0 && opgrp != shpgrp) {
1368 	(void) setpgid(0, opgrp);
1369 	(void) tcsetpgrp(FSHTTY, opgrp);
1370 	(void) resetdisc(FSHTTY);
1371     }
1372 #endif /* BSDJOBS */
1373 }
1374 
1375 void
1376 importpath(cp)
1377     Char   *cp;
1378 {
1379     register int i = 0;
1380     register Char *dp;
1381     register Char **pv;
1382     int     c;
1383 
1384     for (dp = cp; *dp; dp++)
1385 	if (*dp == PATHSEP)
1386 	    i++;
1387     /*
1388      * i+2 where i is the number of colons in the path. There are i+1
1389      * directories in the path plus we need room for a zero terminator.
1390      */
1391     pv = (Char **) xcalloc((size_t) (i + 2), sizeof(Char *));
1392     dp = cp;
1393     i = 0;
1394     if (*dp)
1395 	for (;;) {
1396 	    if ((c = *dp) == PATHSEP || c == 0) {
1397 		*dp = 0;
1398 		pv[i++] = Strsave(*cp ? cp : STRdot);
1399 		if (c) {
1400 		    cp = dp + 1;
1401 		    *dp = PATHSEP;
1402 		}
1403 		else
1404 		    break;
1405 	    }
1406 #ifdef WINNT_NATIVE
1407 	    else if (*dp == '\\')
1408 		*dp = '/';
1409 #endif /* WINNT_NATIVE */
1410 	    dp++;
1411 	}
1412     pv[i] = 0;
1413     setq(STRpath, pv, &shvhed, VAR_READWRITE);
1414 }
1415 
1416 /*
1417  * Source to the file which is the catenation of the argument names.
1418  */
1419 static int
1420 srccat(cp, dp)
1421     Char   *cp, *dp;
1422 {
1423     if (cp[0] == '/' && cp[1] == '\0')
1424 	return srcfile(short2str(dp), (mflag ? 0 : 1), 0, NULL);
1425     else {
1426 	register Char *ep;
1427 	char   *ptr;
1428 	int rv;
1429 
1430 #ifdef WINNT_NATIVE
1431 	ep = cp;
1432 	while(*ep)
1433 	    ep++;
1434 	if (ep[-1] == '/' && dp[0] == '/') /* silly win95 */
1435 	    dp++;
1436 #endif /* WINNT_NATIVE */
1437 
1438 	ep = Strspl(cp, dp);
1439 	ptr = short2str(ep);
1440 
1441 	rv = srcfile(ptr, (mflag ? 0 : 1), 0, NULL);
1442 	xfree((ptr_t) ep);
1443 	return rv;
1444     }
1445 }
1446 
1447 /*
1448  * Source to a file putting the file descriptor in a safe place (> 2).
1449  */
1450 #ifndef WINNT_NATIVE
1451 static int
1452 #else
1453 int
1454 #endif /*WINNT_NATIVE*/
1455 srcfile(f, onlyown, flag, av)
1456     char   *f;
1457     bool    onlyown;
1458     int flag;
1459     Char **av;
1460 {
1461     register int unit;
1462 
1463     if ((unit = open(f, O_RDONLY)) == -1)
1464 	return 0;
1465     unit = dmove(unit, -1);
1466 
1467     (void) close_on_exec(unit, 1);
1468     srcunit(unit, onlyown, flag, av);
1469     return 1;
1470 }
1471 
1472 
1473 /*
1474  * Save the shell state, and establish new argument vector, and new input
1475  * fd.
1476  */
1477 static void
1478 st_save(st, unit, hflg, al, av)
1479     struct saved_state *st;
1480     int unit, hflg;
1481     Char **al, **av;
1482 {
1483     st->insource	= insource;
1484     st->SHIN		= SHIN;
1485     st->intty		= intty;
1486     st->whyles		= whyles;
1487     st->gointr		= gointr;
1488     st->arginp		= arginp;
1489     st->evalp		= evalp;
1490     st->evalvec		= evalvec;
1491     st->alvecp		= alvecp;
1492     st->alvec		= alvec;
1493     st->onelflg		= onelflg;
1494     st->enterhist	= enterhist;
1495     if (hflg)
1496 	st->HIST	= HIST;
1497     else
1498 	st->HIST	= '\0';
1499     st->cantell		= cantell;
1500     cpybin(st->B, B);
1501 
1502     /*
1503      * we can now pass arguments to source.
1504      * For compatibility we do that only if arguments were really
1505      * passed, otherwise we keep the old, global $argv like before.
1506      */
1507     if (av != NULL && *av != NULL) {
1508 	struct varent *vp;
1509 	if ((vp = adrof(STRargv)) != NULL)
1510 	    st->argv = saveblk(vp->vec);
1511 	else
1512 	    st->argv = NULL;
1513 	setq(STRargv, saveblk(av), &shvhed, VAR_READWRITE);
1514     }
1515     else
1516 	st->argv = NULL;
1517 
1518     SHIN	= unit;	/* Do this first */
1519 
1520     /* Establish new input arena */
1521     {
1522 	fbuf = NULL;
1523 	fseekp = feobp = fblocks = 0;
1524 	settell();
1525     }
1526 
1527     arginp	= 0;
1528     onelflg	= 0;
1529     intty	= isatty(SHIN);
1530     whyles	= 0;
1531     gointr	= 0;
1532     evalvec	= 0;
1533     evalp	= 0;
1534     alvec	= al;
1535     alvecp	= 0;
1536     enterhist	= hflg;
1537     if (enterhist)
1538 	HIST	= '\0';
1539     insource	= 1;
1540 }
1541 
1542 
1543 /*
1544  * Restore the shell to a saved state
1545  */
1546 static void
1547 st_restore(st, av)
1548     struct saved_state *st;
1549     Char **av;
1550 {
1551     if (st->SHIN == -1)
1552 	return;
1553 
1554     /* Reset input arena */
1555     {
1556 	register int i;
1557 	register Char** nfbuf = fbuf;
1558 	register int nfblocks = fblocks;
1559 
1560 	fblocks = 0;
1561 	fbuf = NULL;
1562 	for (i = 0; i < nfblocks; i++)
1563 	    xfree((ptr_t) nfbuf[i]);
1564 	xfree((ptr_t) nfbuf);
1565     }
1566     cpybin(B, st->B);
1567 
1568     (void) close(SHIN);
1569 
1570     insource	= st->insource;
1571     SHIN	= st->SHIN;
1572     arginp	= st->arginp;
1573     onelflg	= st->onelflg;
1574     evalp	= st->evalp;
1575     evalvec	= st->evalvec;
1576     alvecp	= st->alvecp;
1577     alvec	= st->alvec;
1578     intty	= st->intty;
1579     whyles	= st->whyles;
1580     gointr	= st->gointr;
1581     if (st->HIST != '\0')
1582 	HIST	= st->HIST;
1583     enterhist	= st->enterhist;
1584     cantell	= st->cantell;
1585 
1586     if (st->argv != NULL)
1587 	setq(STRargv, st->argv, &shvhed, VAR_READWRITE);
1588     else if (av != NULL  && *av != NULL && adrof(STRargv) != NULL)
1589 	unsetv(STRargv);
1590 }
1591 
1592 /*
1593  * Source to a unit.  If onlyown it must be our file or our group or
1594  * we don't chance it.	This occurs on ".cshrc"s and the like.
1595  */
1596 static void
1597 srcunit(unit, onlyown, hflg, av)
1598     register int unit;
1599     bool    onlyown;
1600     int hflg;
1601     Char **av;
1602 {
1603     struct saved_state st;
1604     st.SHIN = -1;	/* st_restore checks this */
1605 
1606     if (unit < 0)
1607 	return;
1608 
1609     if (didfds)
1610 	donefds();
1611 
1612     if (onlyown) {
1613 	struct stat stb;
1614 
1615 	if (fstat(unit, &stb) < 0) {
1616 	    (void) close(unit);
1617 	    return;
1618 	}
1619     }
1620 
1621     getexit(st.oldexit);
1622 
1623     if (setintr)
1624 #ifdef BSDSIGS
1625 	st.mask = sigblock(sigmask(SIGINT));
1626 #else
1627 	(void) sighold(SIGINT);
1628 #endif
1629 
1630     /* Save the current state and move us to a new state */
1631     st_save(&st, unit, hflg, NULL, av);
1632 
1633     /*
1634      * Now if we are allowing commands to be interrupted, we let ourselves be
1635      * interrupted.
1636      */
1637     if (setintr)
1638 #ifdef BSDSIGS
1639 	(void) sigsetmask(st.mask);
1640 #else
1641 	(void) sigrelse(SIGINT);
1642 #endif
1643 
1644     /*
1645      * Bugfix for running out of memory by: Jak Kirman
1646      * <jak%cs.brown.edu@RELAY.CS.NET>.  Solution: pay attention to what
1647      * setexit() is returning because reenter _may_ be in a register, and
1648      * thus restored to 0 on a longjump(). (PWP: insert flames about
1649      * compiler-dependant code here) PWP: THANKS LOTS !!!
1650      *
1651      * PWP: think of this as like a LISP (unwind-protect ...)
1652      * thanks to Diana Smetters for pointing out how this _should_ be written
1653      */
1654 #ifdef cray
1655     st.reenter = 1;		/* assume non-zero return val */
1656     if (setexit() == 0) {
1657 	st.reenter = 0;		/* Oh well, we were wrong */
1658 #else
1659     if ((st.reenter = setexit()) == 0) {
1660 #endif
1661 	process(0);		/* 0 -> blow away on errors */
1662     }
1663 
1664     if (setintr)
1665 #ifdef BSDSIGS
1666 	(void) sigsetmask(st.mask);
1667 #else
1668 	(void) sigrelse(SIGINT);
1669 #endif
1670 
1671     /* Restore the old state */
1672     st_restore(&st, av);
1673     resexit(st.oldexit);
1674     /*
1675      * If process reset() (effectively an unwind) then we must also unwind.
1676      */
1677     if (st.reenter)
1678 	stderror(ERR_SILENT);
1679 }
1680 
1681 
1682 /*ARGSUSED*/
1683 void
1684 goodbye(v, c)
1685     Char **v;
1686     struct command *c;
1687 {
1688     USE(c);
1689     record();
1690 
1691     if (loginsh) {
1692 	(void) sigset(SIGQUIT, SIG_IGN);
1693 	(void) sigset(SIGINT, SIG_IGN);
1694 	(void) sigset(SIGTERM, SIG_IGN);
1695 	(void) sigset(SIGHUP, SIG_IGN);
1696 	setintr = 0;		/* No interrupts after "logout" */
1697 	/* Trap errors inside .logout */
1698 	reenter = setexit();
1699 	if (reenter != 0)
1700 	    exitstat();
1701 	if (!(adrof(STRlogout)))
1702 	    set(STRlogout, Strsave(STRnormal), VAR_READWRITE);
1703 #ifdef _PATH_DOTLOGOUT
1704 	(void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL);
1705 #endif
1706 	if (adrof(STRhome))
1707 	    (void) srccat(varval(STRhome), STRsldtlogout);
1708 #ifdef TESLA
1709 	do_logout = 1;
1710 #endif /* TESLA */
1711     }
1712     exitstat();
1713 }
1714 
1715 void
1716 exitstat()
1717 {
1718 #ifdef PROF
1719     monitor(0);
1720 #endif
1721     /*
1722      * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit
1723      * directly because we poke child here. Otherwise we might continue
1724      * unwarrantedly (sic).
1725      */
1726     child = 1;
1727 
1728     xexit(getn(varval(STRstatus)));
1729 }
1730 
1731 /*
1732  * in the event of a HUP we want to save the history
1733  */
1734 static  sigret_t
1735 phup(snum)
1736 int snum;
1737 {
1738     /*
1739      * There is no return from here,
1740      * so we are not going to release SIGHUP
1741      * anymore
1742      */
1743 #ifdef UNRELSIGS
1744     if (snum)
1745 	(void) sigset(snum, SIG_IGN);
1746 #else
1747 # ifdef BSDSIGS
1748     (void) sigblock(sigmask(SIGHUP));
1749 # else
1750     (void) sighold(SIGHUP);
1751 # endif /* BSDSIGS */
1752 #endif /* UNRELSIGS */
1753 
1754     if (loginsh) {
1755 	set(STRlogout, Strsave(STRhangup), VAR_READWRITE);
1756 #ifdef _PATH_DOTLOGOUT
1757 	(void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL);
1758 #endif
1759 	if (adrof(STRhome))
1760 	    (void) srccat(varval(STRhome), STRsldtlogout);
1761     }
1762 
1763     record();
1764 
1765 #ifdef POSIXJOBS
1766     /*
1767      * We kill the last foreground process group. It then becomes
1768      * responsible to propagate the SIGHUP to its progeny.
1769      */
1770     {
1771 	struct process *pp, *np;
1772 
1773 	for (pp = proclist.p_next; pp; pp = pp->p_next) {
1774 	    np = pp;
1775 	    /*
1776 	     * Find if this job is in the foreground. It could be that
1777 	     * the process leader has exited and the foreground flag
1778 	     * is cleared for it.
1779 	     */
1780 	    do
1781 		/*
1782 		 * If a process is in the foreground we try to kill
1783 		 * it's process group. If we succeed, then the
1784 		 * whole job is gone. Otherwise we keep going...
1785 		 * But avoid sending HUP to the shell again.
1786 		 */
1787 		if (((np->p_flags & PFOREGND) != 0) && np->p_jobid != shpgrp) {
1788 		    np->p_flags &= ~PHUP;
1789 		    if (killpg(np->p_jobid, SIGHUP) != -1) {
1790 			/* In case the job was suspended... */
1791 #ifdef SIGCONT
1792 			(void) killpg(np->p_jobid, SIGCONT);
1793 #endif
1794 			break;
1795 		    }
1796 		}
1797 	    while ((np = np->p_friends) != pp);
1798 	}
1799     }
1800 #endif /* POSIXJOBS */
1801 
1802     xexit(snum);
1803 #ifndef SIGVOID
1804     return (snum);
1805 #endif
1806 }
1807 
1808 static Char   *jobargv[2] = {STRjobs, 0};
1809 
1810 /*
1811  * Catch an interrupt, e.g. during lexical input.
1812  * If we are an interactive shell, we reset the interrupt catch
1813  * immediately.  In any case we drain the shell output,
1814  * and finally go through the normal error mechanism, which
1815  * gets a chance to make the shell go away.
1816  */
1817 int     just_signaled;		/* bugfix by Michael Bloom (mg@ttidca.TTI.COM) */
1818 
1819 #ifdef SIGVOID
1820 /*ARGSUSED*/
1821 #endif
1822 sigret_t
1823 pintr(snum)
1824 int snum;
1825 {
1826 #ifdef UNRELSIGS
1827     if (snum)
1828 	(void) sigset(snum, pintr);
1829 #endif /* UNRELSIGS */
1830     just_signaled = 1;
1831     pintr1(1);
1832 #ifndef SIGVOID
1833     return (snum);
1834 #endif
1835 }
1836 
1837 void
1838 pintr1(wantnl)
1839     bool    wantnl;
1840 {
1841     register Char **v;
1842 #ifdef BSDSIGS
1843     sigmask_t omask;
1844 #endif
1845 
1846 #ifdef BSDSIGS
1847     omask = sigblock((sigmask_t) 0);
1848 #endif
1849     if (setintr) {
1850 #ifdef BSDSIGS
1851 	(void) sigsetmask(omask & ~sigmask(SIGINT));
1852 #else
1853 	(void) sigrelse(SIGINT);
1854 #endif
1855 	if (pjobs) {
1856 	    pjobs = 0;
1857 	    xputchar('\n');
1858 	    dojobs(jobargv, NULL);
1859 	    stderror(ERR_NAME | ERR_INTR);
1860 	}
1861     }
1862     /* MH - handle interrupted completions specially */
1863     {
1864 	extern int InsideCompletion;
1865 
1866 	if (InsideCompletion)
1867 	    stderror(ERR_SILENT);
1868     }
1869     /* JV - Make sure we shut off inputl */
1870     {
1871 	extern Char GettingInput;
1872 
1873 	(void) Cookedmode();
1874 	GettingInput = 0;
1875     }
1876 #ifdef BSDSIGS
1877     (void) sigsetmask(omask & ~sigmask(SIGCHLD));
1878 #else
1879     if (setintr)
1880 	(void) sighold(SIGINT);
1881     (void) sigrelse(SIGCHLD);
1882 #endif
1883     drainoline();
1884 #if !defined(_VMS_POSIX) && !defined(WINNT_NATIVE)
1885     (void) endpwent();
1886 #endif /* !_VMS_POSIX && !WINNT_NATIVE */
1887 
1888     /*
1889      * If we have an active "onintr" then we search for the label. Note that if
1890      * one does "onintr -" then we shan't be interruptible so we needn't worry
1891      * about that here.
1892      */
1893     if (gointr) {
1894 	gotolab(gointr);
1895 	timflg = 0;
1896 	if ((v = pargv) != 0)
1897 	    pargv = 0, blkfree(v);
1898 	if ((v = gargv) != 0)
1899 	    gargv = 0, blkfree(v);
1900 	reset();
1901     }
1902     else if (intty && wantnl) {
1903 	if (editing) {
1904 	    /*
1905 	     * If we are editing a multi-line input command, and move to
1906 	     * the beginning of the line, we don't want to trash it when
1907 	     * we hit ^C
1908 	     */
1909 	    PastBottom();
1910 	    ClearLines();
1911 	    ClearDisp();
1912 	}
1913 	else {
1914 	    /* xputchar('\n'); *//* Some like this, others don't */
1915 	    (void) putraw('\r');
1916 	    (void) putraw('\n');
1917 	}
1918     }
1919     stderror(ERR_SILENT);
1920 }
1921 
1922 /*
1923  * Process is the main driving routine for the shell.
1924  * It runs all command processing, except for those within { ... }
1925  * in expressions (which is run by a routine evalav in sh.exp.c which
1926  * is a stripped down process), and `...` evaluation which is run
1927  * also by a subset of this code in sh.glob.c in the routine backeval.
1928  *
1929  * The code here is a little strange because part of it is interruptible
1930  * and hence freeing of structures appears to occur when none is necessary
1931  * if this is ignored.
1932  *
1933  * Note that if catch is not set then we will unwind on any error.
1934  * If an end-of-file occurs, we return.
1935  */
1936 static struct command *savet = NULL;
1937 void
1938 process(catch)
1939     bool    catch;
1940 {
1941     extern char Expand;
1942     jmp_buf_t osetexit;
1943     /* PWP: This might get nuked my longjmp so don't make it a register var */
1944     struct command *t = savet;
1945 
1946     savet = NULL;
1947     getexit(osetexit);
1948     for (;;) {
1949 
1950 	pendjob();
1951 
1952 	/* This was leaking memory badly, particularly when sourcing
1953 	 * files, etc.. For whatever reason we were arriving here with
1954 	 * allocated pointers still active, and the code was simply
1955 	 * overwriting them.  I can't say I fully understand the
1956 	 * control flow here, but according to Purify this particular
1957 	 * leak has been plugged, and I haven't noticed any ill
1958 	 * effects.. (sg)
1959 	 */
1960 	if (paraml.next && paraml.next != &paraml)
1961 	    freelex(&paraml);
1962 
1963 	paraml.next = paraml.prev = &paraml;
1964 	paraml.word = STRNULL;
1965 	(void) setexit();
1966 	justpr = enterhist;	/* execute if not entering history */
1967 
1968 	/*
1969 	 * Interruptible during interactive reads
1970 	 */
1971 	if (setintr)
1972 #ifdef BSDSIGS
1973 	    (void) sigsetmask(sigblock((sigmask_t) 0) & ~sigmask(SIGINT));
1974 #else
1975 	    (void) sigrelse(SIGINT);
1976 #endif
1977 
1978 
1979 	/*
1980 	 * For the sake of reset()
1981 	 */
1982 	freelex(&paraml);
1983 	if (savet)
1984 	    freesyn(savet), savet = NULL;
1985 
1986 	if (haderr) {
1987 	    if (!catch) {
1988 		/* unwind */
1989 		doneinp = 0;
1990 		savet = t;
1991 		resexit(osetexit);
1992 		reset();
1993 	    }
1994 	    haderr = 0;
1995 	    /*
1996 	     * Every error is eventually caught here or the shell dies.  It is
1997 	     * at this point that we clean up any left-over open files, by
1998 	     * closing all but a fixed number of pre-defined files.  Thus
1999 	     * routines don't have to worry about leaving files open due to
2000 	     * deeper errors... they will get closed here.
2001 	     */
2002 	    closem();
2003 	    continue;
2004 	}
2005 	if (doneinp) {
2006 	    doneinp = 0;
2007 	    break;
2008 	}
2009 	if (chkstop)
2010 	    chkstop--;
2011 	if (neednote)
2012 	    pnote();
2013 	if (intty && prompt && evalvec == 0) {
2014 	    just_signaled = 0;
2015 	    mailchk();
2016 	    /*
2017 	     * Watch for logins/logouts. Next is scheduled commands stored
2018 	     * previously using "sched." Then execute periodic commands.
2019 	     * Following that, the prompt precmd is run.
2020 	     */
2021 #ifndef HAVENOUTMP
2022 	    watch_login(0);
2023 #endif /* !HAVENOUTMP */
2024 	    sched_run(0);
2025 	    period_cmd();
2026 	    precmd();
2027 	    /*
2028 	     * If we are at the end of the input buffer then we are going to
2029 	     * read fresh stuff. Otherwise, we are rereading input and don't
2030 	     * need or want to prompt.
2031 	     */
2032 	    if (fseekp == feobp && aret == TCSH_F_SEEK)
2033 		printprompt(0, NULL);
2034 	    flush();
2035 	    setalarm(1);
2036 	}
2037 	if (seterr) {
2038 	    xfree((ptr_t) seterr);
2039 	    seterr = NULL;
2040 	}
2041 
2042 	/*
2043 	 * Echo not only on VERBOSE, but also with history expansion. If there
2044 	 * is a lexical error then we forego history echo.
2045 	 */
2046 	if ((lex(&paraml) && !seterr && intty && !tellwhat && !Expand &&
2047 	     !whyles) || adrof(STRverbose)) {
2048 	    haderr = 1;
2049 	    prlex(&paraml);
2050 	    haderr = 0;
2051 	}
2052 	(void) alarm(0);	/* Autologout OFF */
2053 
2054 	/*
2055 	 * The parser may lose space if interrupted.
2056 	 */
2057 	if (setintr)
2058 #ifdef BSDSIGS
2059 	    (void) sigblock(sigmask(SIGINT));
2060 #else
2061 	    (void) sighold(SIGINT);
2062 #endif
2063 
2064 	/*
2065 	 * Save input text on the history list if reading in old history, or it
2066 	 * is from the terminal at the top level and not in a loop.
2067 	 *
2068 	 * PWP: entry of items in the history list while in a while loop is done
2069 	 * elsewhere...
2070 	 */
2071 	if (enterhist || (catch && intty && !whyles && !tellwhat && !arun))
2072 	    savehist(&paraml, enterhist > 1);
2073 
2074 	if (Expand && seterr)
2075 	    Expand = 0;
2076 
2077 	/*
2078 	 * Print lexical error messages, except when sourcing history lists.
2079 	 */
2080 	if (!enterhist && seterr)
2081 	    stderror(ERR_OLD);
2082 
2083 	/*
2084 	 * If had a history command :p modifier then this is as far as we
2085 	 * should go
2086 	 */
2087 	if (justpr)
2088 	    reset();
2089 
2090 	/*
2091 	 * If had a tellwhat from twenex() then do
2092 	 */
2093 	if (tellwhat) {
2094 	    (void) tellmewhat(&paraml, NULL);
2095 	    reset();
2096 	}
2097 
2098 	alias(&paraml);
2099 
2100 #ifdef BSDJOBS
2101 	/*
2102 	 * If we are interactive, try to continue jobs that we have stopped
2103 	 */
2104 	if (prompt)
2105 	    continue_jobs(&paraml);
2106 #endif				/* BSDJOBS */
2107 
2108 	/*
2109 	 * Check to see if the user typed "rm * .o" or something
2110 	 */
2111 	if (prompt)
2112 	    rmstar(&paraml);
2113 	/*
2114 	 * Parse the words of the input into a parse tree.
2115 	 */
2116 	savet = syntax(paraml.next, &paraml, 0);
2117 	if (seterr)
2118 	    stderror(ERR_OLD);
2119 
2120 	postcmd();
2121 	/*
2122 	 * Execute the parse tree From: Michael Schroeder
2123 	 * <mlschroe@immd4.informatik.uni-erlangen.de> was execute(t, tpgrp);
2124 	 */
2125 	execute(savet, (tpgrp > 0 ? tpgrp : -1), NULL, NULL);
2126 
2127 	/*
2128 	 * Made it!
2129 	 */
2130 	freelex(&paraml);
2131 	freesyn(savet), savet = NULL;
2132 #ifdef SIG_WINDOW
2133 	if (catch && intty && !whyles && !tellwhat)
2134 	    (void) window_change(0);	/* for window systems */
2135 #endif /* SIG_WINDOW */
2136 	set(STR_, Strsave(InputBuf), VAR_READWRITE | VAR_NOGLOB);
2137     }
2138     savet = t;
2139     resexit(osetexit);
2140 }
2141 
2142 /*ARGSUSED*/
2143 void
2144 dosource(t, c)
2145     register Char **t;
2146     struct command *c;
2147 {
2148     register Char *f;
2149     bool    hflg = 0;
2150     extern int bequiet;
2151     char    buf[BUFSIZE];
2152 
2153     USE(c);
2154     t++;
2155     if (*t && eq(*t, STRmh)) {
2156 	if (*++t == NULL)
2157 	    stderror(ERR_NAME | ERR_HFLAG);
2158 	hflg++;
2159     }
2160     else if (*t && eq(*t, STRmm)) {
2161     	if (*++t == NULL)
2162 	    stderror(ERR_NAME | ERR_MFLAG);
2163 	hflg = 2;
2164     }
2165 
2166     f = globone(*t++, G_ERROR);
2167     (void) strcpy(buf, short2str(f));
2168     xfree((ptr_t) f);
2169     if ((!srcfile(buf, 0, hflg, t)) && (!hflg) && (!bequiet))
2170 	stderror(ERR_SYSTEM, buf, strerror(errno));
2171 }
2172 
2173 /*
2174  * Check for mail.
2175  * If we are a login shell, then we don't want to tell
2176  * about any mail file unless its been modified
2177  * after the time we started.
2178  * This prevents us from telling the user things he already
2179  * knows, since the login program insists on saying
2180  * "You have mail."
2181  */
2182 
2183 /*
2184  * The AMS version.
2185  * This version checks if the file is a directory, and if so,
2186  * tells you the number of files in it, otherwise do the old thang.
2187  * The magic "+1" in the time calculation is to compensate for
2188  * an AFS bug where directory mtimes are set to 1 second in
2189  * the future.
2190  */
2191 
2192 static void
2193 mailchk()
2194 {
2195     register struct varent *v;
2196     register Char **vp;
2197     time_t  t;
2198     int     intvl, cnt;
2199     struct stat stb;
2200     bool    new;
2201 
2202     v = adrof(STRmail);
2203     if (v == 0)
2204 	return;
2205     (void) time(&t);
2206     vp = v->vec;
2207     cnt = blklen(vp);
2208     intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL;
2209     if (intvl < 1)
2210 	intvl = 1;
2211     if (chktim + intvl > t)
2212 	return;
2213     for (; *vp; vp++) {
2214 	char *filename = short2str(*vp);
2215 	char *mboxdir = filename;
2216 
2217 	if (stat(filename, &stb) < 0)
2218 	    continue;
2219 #if defined(BSDTIMES) || defined(_SEQUENT_)
2220 	new = stb.st_mtime > time0.tv_sec;
2221 #else
2222 	new = stb.st_mtime > seconds0;
2223 #endif
2224 	if (S_ISDIR(stb.st_mode)) {
2225 	    DIR *mailbox;
2226 	    int mailcount = 0;
2227 	    char tempfilename[MAXPATHLEN];
2228 	    struct stat stc;
2229 
2230 	    xsnprintf(tempfilename, MAXPATHLEN, "%s/new", filename);
2231 
2232 	    if (stat(tempfilename, &stc) != -1 && S_ISDIR(stc.st_mode)) {
2233 		/*
2234 		 * "filename/new" exists and is a directory; you are
2235 		 * using Qmail.
2236 		 */
2237 		stb = stc;
2238 #if defined(BSDTIMES) || defined(_SEQUENT_)
2239 		new = stb.st_mtime > time0.tv_sec;
2240 #else
2241 		new = stb.st_mtime > seconds0;
2242 #endif
2243 		mboxdir = tempfilename;
2244 	    }
2245 
2246 	    if (stb.st_mtime <= chktim + 1 || (loginsh && !new))
2247 		continue;
2248 
2249 	    if ((mailbox = opendir(mboxdir)) == NULL)
2250 		continue;
2251 
2252 	    /* skip . and .. */
2253 	    if (!readdir(mailbox) || !readdir(mailbox))
2254 		continue;
2255 
2256 	    while (readdir(mailbox))
2257 		mailcount++;
2258 
2259 	    if (mailcount == 0)
2260 		continue;
2261 
2262 	    if (cnt == 1)
2263 		xprintf(CGETS(11, 3, "You have %d mail messages.\n"),
2264 			mailcount);
2265 	    else
2266 		xprintf(CGETS(11, 4, "You have %d mail messages in %s.\n"),
2267 			mailcount, filename);
2268 	}
2269 	else {
2270 	    if (stb.st_size == 0 || stb.st_atime > stb.st_mtime ||
2271 		(stb.st_atime <= chktim && stb.st_mtime <= chktim) ||
2272 		(loginsh && !new))
2273 		continue;
2274 	    if (cnt == 1)
2275 		xprintf(CGETS(11, 5, "You have %smail.\n"),
2276 			new ? CGETS(11, 6, "new ") : "");
2277 	    else
2278 	        xprintf(CGETS(11, 7, "You have %smail in %s.\n"),
2279 			new ? CGETS(11, 6, "new ") : "", filename);
2280 	}
2281     }
2282     chktim = t;
2283 }
2284 
2285 /*
2286  * Extract a home directory from the password file
2287  * The argument points to a buffer where the name of the
2288  * user whose home directory is sought is currently.
2289  * We write the home directory of the user back there.
2290  */
2291 int
2292 gethdir(home)
2293     Char   *home;
2294 {
2295     Char   *h;
2296 
2297     /*
2298      * Is it us?
2299      */
2300     if (*home == '\0') {
2301 	if ((h = varval(STRhome)) != STRNULL) {
2302 	    (void) Strcpy(home, h);
2303 	    return 0;
2304 	}
2305 	else
2306 	    return 1;
2307     }
2308 
2309     /*
2310      * Look in the cache
2311      */
2312     if ((h = gettilde(home)) == NULL)
2313 	return 1;
2314     else {
2315 	(void) Strcpy(home, h);
2316 	return 0;
2317     }
2318 }
2319 
2320 /*
2321  * Move the initial descriptors to their eventual
2322  * resting places, closing all other units.
2323  */
2324 void
2325 initdesc()
2326 {
2327 #ifdef NLS_BUGS
2328 #ifdef NLS_CATALOGS
2329     (void)catclose(catd);
2330 #endif /* NLS_CATALOGS */
2331 #endif /* NLS_BUGS */
2332 
2333 
2334     didfds = 0;			/* 0, 1, 2 aren't set up */
2335     (void) close_on_exec(SHIN = dcopy(0, FSHIN), 1);
2336     (void) close_on_exec(SHOUT = dcopy(1, FSHOUT), 1);
2337     (void) close_on_exec(SHDIAG = dcopy(2, FSHDIAG), 1);
2338     (void) close_on_exec(OLDSTD = dcopy(SHIN, FOLDSTD), 1);
2339 #ifndef CLOSE_ON_EXEC
2340     didcch = 0;			/* Havent closed for child */
2341 #endif /* CLOSE_ON_EXEC */
2342     isdiagatty = isatty(SHDIAG);
2343     isoutatty = isatty(SHOUT);
2344     closem();
2345 #ifdef NLS_BUGS
2346 #ifdef NLS_CATALOGS
2347     nlsinit();
2348 #endif /* NLS_CATALOGS */
2349 #endif /* NLS_BUGS */
2350 }
2351 
2352 
2353 void
2354 #ifdef PROF
2355 done(i)
2356 #else
2357 xexit(i)
2358 #endif
2359     int     i;
2360 {
2361 #ifdef TESLA
2362     if (loginsh && do_logout) {
2363 	/* this is to send hangup signal to the develcon */
2364 	/* we toggle DTR. clear dtr - sleep 1 - set dtr */
2365 	/* ioctl will return ENOTTY for pty's but we ignore it 	 */
2366 	/* exitstat will run after disconnect */
2367 	/* we sleep for 2 seconds to let things happen in */
2368 	/* .logout and rechist() */
2369 #ifdef TIOCCDTR
2370 	(void) sleep(2);
2371 	(void) ioctl(FSHTTY, TIOCCDTR, NULL);
2372 	(void) sleep(1);
2373 	(void) ioctl(FSHTTY, TIOCSDTR, NULL);
2374 #endif /* TIOCCDTR */
2375     }
2376 #endif /* TESLA */
2377 
2378     {
2379 	struct process *pp, *np;
2380 
2381 	/* Kill all processes marked for hup'ing */
2382 	for (pp = proclist.p_next; pp; pp = pp->p_next) {
2383 	    np = pp;
2384 	    do
2385 		if ((np->p_flags & PHUP) && np->p_jobid != shpgrp) {
2386 		    if (killpg(np->p_jobid, SIGHUP) != -1) {
2387 			/* In case the job was suspended... */
2388 #ifdef SIGCONT
2389 			(void) killpg(np->p_jobid, SIGCONT);
2390 #endif
2391 			break;
2392 		    }
2393 		}
2394 	    while ((np = np->p_friends) != pp);
2395 	}
2396     }
2397     untty();
2398 #ifdef NLS_CATALOGS
2399     /*
2400      * We need to call catclose, because SVR4 leaves symlinks behind otherwise
2401      * in the catalog directories. We cannot close on a vforked() child,
2402      * because messages will stop working on the parent too.
2403      */
2404     if (child == 0)
2405 	(void) catclose(catd);
2406 #endif /* NLS_CATALOGS */
2407 #ifdef WINNT_NATIVE
2408     nt_cleanup();
2409 #endif /* WINNT_NATIVE */
2410     _exit(i);
2411 }
2412 
2413 #ifndef _PATH_DEFPATH
2414 static Char **
2415 defaultpath()
2416 {
2417     char   *ptr;
2418     Char  **blk, **blkp;
2419     struct stat stb;
2420 
2421     blkp = blk = (Char **) xmalloc((size_t) sizeof(Char *) * 10);
2422 
2423 #ifndef NODOT
2424 # ifndef DOTLAST
2425     *blkp++ = Strsave(STRdot);
2426 # endif
2427 #endif
2428 
2429 #define DIRAPPEND(a)  \
2430 	if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \
2431 		*blkp++ = SAVE(ptr)
2432 
2433 #ifdef _PATH_LOCAL
2434     DIRAPPEND(_PATH_LOCAL);
2435 #endif
2436 
2437 #ifdef _PATH_USRUCB
2438     DIRAPPEND(_PATH_USRUCB);
2439 #endif
2440 
2441 #ifdef _PATH_USRBSD
2442     DIRAPPEND(_PATH_USRBSD);
2443 #endif
2444 
2445 #ifdef _PATH_BIN
2446     DIRAPPEND(_PATH_BIN);
2447 #endif
2448 
2449 #ifdef _PATH_USRBIN
2450     DIRAPPEND(_PATH_USRBIN);
2451 #endif
2452 
2453 #undef DIRAPPEND
2454 
2455 #ifndef NODOT
2456 # ifdef DOTLAST
2457     *blkp++ = Strsave(STRdot);
2458 # endif
2459 #endif
2460     *blkp = NULL;
2461     return (blk);
2462 }
2463 #endif
2464 
2465 static void
2466 record()
2467 {
2468     if (!fast) {
2469 	recdirs(NULL, adrof(STRsavedirs) != NULL);
2470 	rechist(NULL, adrof(STRsavehist) != NULL);
2471     }
2472 }
2473