1 /* $Header: /p/tcsh/cvsroot/tcsh/sh.c,v 3.174 2011/11/29 18:38:54 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. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 #define EXTERN	/* Intern */
34 #include "sh.h"
35 
36 #ifndef lint
37 char    copyright[] =
38 "@(#) Copyright (c) 1991 The Regents of the University of California.\n\
39  All rights reserved.\n";
40 #endif /* not lint */
41 
42 RCSID("$tcsh: sh.c,v 3.174 2011/11/29 18:38:54 christos Exp $")
43 
44 #include "tc.h"
45 #include "ed.h"
46 #include "tw.h"
47 
48 extern int MapsAreInited;
49 extern int NLSMapsAreInited;
50 
51 /*
52  * C Shell
53  *
54  * Bill Joy, UC Berkeley, California, USA
55  * October 1978, May 1980
56  *
57  * Jim Kulp, IIASA, Laxenburg, Austria
58  * April 1980
59  *
60  * Filename recognition added:
61  * Ken Greer, Ind. Consultant, Palo Alto CA
62  * October 1983.
63  *
64  * Karl Kleinpaste, Computer Consoles, Inc.
65  * Added precmd, periodic/tperiod, prompt changes,
66  * directory stack hack, and login watch.
67  * Sometime March 1983 - Feb 1984.
68  *
69  * Added scheduled commands, including the "sched" command,
70  * plus the call to sched_run near the precmd et al
71  * routines.
72  * Upgraded scheduled events for running events while
73  * sitting idle at command input.
74  *
75  * Paul Placeway, Ohio State
76  * added stuff for running with twenex/inputl  9 Oct 1984.
77  *
78  * ported to Apple Unix (TM) (OREO)  26 -- 29 Jun 1987
79  */
80 
81 jmp_buf_t reslab;
82 
83 static const char tcshstr[] = "tcsh";
84 
85 struct sigaction parintr;	/* Parents interrupt catch */
86 struct sigaction parterm;	/* Parents terminate catch */
87 
88 #ifdef TESLA
89 int do_logout = 0;
90 #endif /* TESLA */
91 
92 
93 int    use_fork = 0;		/* use fork() instead of vfork()? */
94 
95 /*
96  * Magic pointer values. Used to specify other invalid conditions aside
97  * from null.
98  */
99 static Char	INVCHAR;
100 Char    *INVPTR = &INVCHAR;
101 Char    **INVPPTR = &INVPTR;
102 
103 static int    fast = 0;
104 static int    mflag = 0;
105 static int    prompt = 1;
106 int     enterhist = 0;
107 int    tellwhat = 0;
108 time_t  t_period;
109 Char  *ffile = NULL;
110 int	dolzero = 0;
111 int	insource = 0;
112 int	exitset = 0;
113 static time_t  chktim;		/* Time mail last checked */
114 char *progname;
115 int tcsh;
116 
117 /*
118  * This preserves the input state of the shell. It is used by
119  * st_save and st_restore to manupulate shell state.
120  */
121 struct saved_state {
122     int		  insource;
123     int		  OLDSTD;
124     int		  SHIN;
125     int		  SHOUT;
126     int		  SHDIAG;
127     int		  intty;
128     struct whyle *whyles;
129     Char 	 *gointr;
130     Char 	 *arginp;
131     Char	 *evalp;
132     Char	**evalvec;
133     Char	 *alvecp;
134     Char	**alvec;
135     int		  onelflg;
136     int	  enterhist;
137     Char	**argv;
138     Char	**av;
139     Char	  HIST;
140     int	  cantell;
141     struct Bin	  B;
142     int		  justpr;
143 };
144 
145 static	int		  srccat	(Char *, Char *);
146 #ifndef WINNT_NATIVE
147 static	int		  srcfile	(const char *, int, int, Char **);
148 #else
149 int		  srcfile	(const char *, int, int, Char **);
150 #endif /*WINNT_NATIVE*/
151 static	void		  srcunit	(int, int, int, Char **);
152 static	void		  mailchk	(void);
153 #ifndef _PATH_DEFPATH
154 static	Char	 	**defaultpath	(void);
155 #endif
156 static	void		  record	(void);
157 static	void		  st_save	(struct saved_state *, int, int,
158 					 Char **, Char **);
159 static	void		  st_restore	(void *);
160 
161 	int		  main		(int, char **);
162 
163 #ifndef LOCALEDIR
164 #define LOCALEDIR "/usr/share/locale"
165 #endif
166 
167 #ifdef NLS_CATALOGS
168 static void
add_localedir_to_nlspath(const char * path)169 add_localedir_to_nlspath(const char *path)
170 {
171     static const char msgs_LOC[] = "/%L/LC_MESSAGES/%N.cat";
172     static const char msgs_lang[] = "/%l/LC_MESSAGES/%N.cat";
173     char *old;
174     char *new, *new_p;
175     size_t len;
176     int add_LOC = 1;
177     int add_lang = 1;
178     char trypath[MAXPATHLEN];
179     struct stat st;
180 
181     if (path == NULL)
182         return;
183 
184     (void) xsnprintf(trypath, sizeof(trypath), "%s/en/LC_MESSAGES/tcsh.cat",
185 	path);
186     if (stat(trypath, &st) == -1)
187 	return;
188 
189     if ((old = getenv("NLSPATH")) != NULL)
190         len = strlen(old) + 1;	/* don't forget the colon. */
191     else
192 	len = 0;
193 
194     len += 2 * strlen(path) +
195 	   sizeof(msgs_LOC) + sizeof(msgs_lang); /* includes the extra colon */
196 
197     new = new_p = xcalloc(len, 1);
198 
199     if (old != NULL) {
200 	size_t pathlen = strlen(path);
201 	char *old_p;
202 
203 	(void) xsnprintf(new_p, len, "%s", old);
204 	new_p += strlen(new_p);
205 	len -= new_p - new;
206 
207 	/* Check if the paths we try to add are already present in NLSPATH.
208 	   If so, note it by setting the appropriate flag to 0. */
209 	for (old_p = old; old_p; old_p = strchr(old_p, ':'),
210 				 old_p = old_p ? old_p + 1 : NULL) {
211 	    if (strncmp(old_p, path, pathlen) != 0)
212 	    	continue;
213 	    if (strncmp(old_p + pathlen, msgs_LOC, sizeof(msgs_LOC) - 1) == 0)
214 		add_LOC = 0;
215 	    else if (strncmp(old_p + pathlen, msgs_lang,
216 			      sizeof(msgs_lang) - 1) == 0)
217 		add_lang = 0;
218 	}
219     }
220 
221     /* Add the message catalog paths not already present to NLSPATH. */
222     if (add_LOC || add_lang)
223 	(void) xsnprintf(new_p, len, "%s%s%s%s%s%s",
224 			 old ? ":" : "",
225 			 add_LOC ? path : "", add_LOC ? msgs_LOC : "",
226 			 add_LOC && add_lang ? ":" : "",
227 			 add_lang ? path : "", add_lang ? msgs_lang : "");
228 
229     tsetenv(STRNLSPATH, str2short(new));
230     free(new);
231 }
232 #endif
233 
234 int
main(int argc,char ** argv)235 main(int argc, char **argv)
236 {
237     int batch = 0;
238     volatile int nexececho = 0;
239     int nofile = 0;
240     volatile int nverbose = 0;
241     volatile int rdirs = 0;
242     int quitit = 0;
243     Char *cp;
244 #ifdef AUTOLOGOUT
245     Char *cp2;
246 #endif
247     char *tcp, *ttyn;
248     int f, reenter;
249     char **tempv;
250     int osetintr;
251     struct sigaction oparintr;
252 
253     (void)memset(&reslab, 0, sizeof(reslab));
254 #ifdef WINNT_NATIVE
255     nt_init();
256 #endif /* WINNT_NATIVE */
257 #if defined(NLS_CATALOGS) && defined(LC_MESSAGES)
258     (void) setlocale(LC_MESSAGES, "");
259 #endif /* NLS_CATALOGS && LC_MESSAGES */
260 
261 #ifdef NLS
262 # ifdef LC_CTYPE
263     (void) setlocale(LC_CTYPE, ""); /* for iscntrl */
264 # endif /* LC_CTYPE */
265 #endif /* NLS */
266 
267     STR_environ = blk2short(environ);
268     environ = short2blk(STR_environ);	/* So that we can free it */
269 
270 #ifdef NLS_CATALOGS
271     add_localedir_to_nlspath(LOCALEDIR);
272 #endif
273 
274     nlsinit();
275 
276 #ifdef MALLOC_TRACE
277     mal_setstatsfile(fdopen(dmove(xopen("/tmp/tcsh.trace",
278 	O_WRONLY|O_CREAT|O_LARGEFILE, 0666), 25), "w"));
279     mal_trace(1);
280 #endif /* MALLOC_TRACE */
281 
282 #if !(defined(BSDTIMES) || defined(_SEQUENT_)) && defined(POSIX)
283 # ifdef _SC_CLK_TCK
284     clk_tck = (clock_t) sysconf(_SC_CLK_TCK);
285 # else /* ! _SC_CLK_TCK */
286 #  ifdef CLK_TCK
287     clk_tck = CLK_TCK;
288 #  else /* !CLK_TCK */
289     clk_tck = HZ;
290 #  endif /* CLK_TCK */
291 # endif /* _SC_CLK_TCK */
292 #endif /* !BSDTIMES && POSIX */
293 
294     settimes();			/* Immed. estab. timing base */
295 #ifdef TESLA
296     do_logout = 0;
297 #endif /* TESLA */
298 
299     /*
300      * Make sure we have 0, 1, 2 open
301      * Otherwise `` jobs will not work... (From knaff@poly.polytechnique.fr)
302      */
303     {
304 	do
305 	    if ((f = xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE)) == -1 &&
306 		(f = xopen("/", O_RDONLY|O_LARGEFILE)) == -1)
307 		exit(1);
308 	while (f < 3);
309 	xclose(f);
310     }
311 
312     osinit();			/* Os dependent initialization */
313 
314 
315     {
316 	char *t;
317 
318 	t = strrchr(argv[0], '/');
319 #ifdef WINNT_NATIVE
320 	{
321 	    char *s = strrchr(argv[0], '\\');
322 	    if (s)
323 		t = s;
324 	}
325 #endif /* WINNT_NATIVE */
326 	t = t ? t + 1 : argv[0];
327 	if (*t == '-') t++;
328 	progname = strsave((t && *t) ? t : tcshstr);    /* never want a null */
329 	tcsh = strncmp(progname, tcshstr, sizeof(tcshstr) - 1) == 0;
330     }
331 
332     /*
333      * Initialize non constant strings
334      */
335 #ifdef _PATH_BSHELL
336     STR_BSHELL = SAVE(_PATH_BSHELL);
337 #endif
338 #ifdef _PATH_TCSHELL
339     STR_SHELLPATH = SAVE(_PATH_TCSHELL);
340 #else
341 # ifdef _PATH_CSHELL
342     STR_SHELLPATH = SAVE(_PATH_CSHELL);
343 # endif
344 #endif
345     STR_WORD_CHARS = SAVE(WORD_CHARS);
346 
347     HIST = '!';
348     HISTSUB = '^';
349     PRCH = tcsh ? '>' : '%';	/* to replace %# in $prompt for normal users */
350     PRCHROOT = '#';		/* likewise for root */
351     word_chars = STR_WORD_CHARS;
352     bslash_quote = 0;		/* PWP: do tcsh-style backslash quoting? */
353     anyerror = 1;		/* for compatibility */
354     setcopy(STRanyerror, STRNULL, VAR_READWRITE);
355 
356     /* Default history size to 100 */
357     setcopy(STRhistory, str2short("100"), VAR_READWRITE);
358 
359     tempv = argv;
360     ffile = SAVE(tempv[0]);
361     dolzero = 0;
362     if (eq(ffile, STRaout))	/* A.out's are quittable */
363 	quitit = 1;
364     uid = getuid();
365     gid = getgid();
366     euid = geteuid();
367     egid = getegid();
368     /*
369      * We are a login shell if: 1. we were invoked as -<something> with
370      * optional arguments 2. or we were invoked only with the -l flag
371      */
372     loginsh = (**tempv == '-') || (argc == 2 &&
373 				   tempv[1][0] == '-' && tempv[1][1] == 'l' &&
374 						tempv[1][2] == '\0');
375 #ifdef _VMS_POSIX
376     /* No better way to find if we are a login shell */
377     if (!loginsh) {
378 	loginsh = (argc == 1 && getppid() == 1);
379 	**tempv = '-';	/* Avoid giving VMS an acidic stomach */
380     }
381 #endif /* _VMS_POSIX */
382 
383     if (loginsh && **tempv != '-') {
384 	char *argv0;
385 
386 	/*
387 	 * Mangle the argv space
388 	 */
389 	tempv[1][0] = '\0';
390 	tempv[1][1] = '\0';
391 	tempv[1] = NULL;
392 	argv0 = strspl("-", *tempv);
393 	*tempv = argv0;
394 	argc--;
395     }
396     if (loginsh) {
397 	(void) time(&chktim);
398 	setNS(STRloginsh);
399     }
400 
401     NoNLSRebind = getenv("NOREBIND") != NULL;
402 #ifdef NLS
403 # ifdef SETLOCALEBUG
404     dont_free = 1;
405 # endif /* SETLOCALEBUG */
406     (void) setlocale(LC_ALL, "");
407 # ifdef LC_COLLATE
408     (void) setlocale(LC_COLLATE, "");
409 # endif
410 # ifdef SETLOCALEBUG
411     dont_free = 0;
412 # endif /* SETLOCALEBUG */
413 # ifdef STRCOLLBUG
414     fix_strcoll_bug();
415 # endif /* STRCOLLBUG */
416 
417     /*
418      * On solaris ISO8859-1 contains no printable characters in the upper half
419      * so we need to test only for MB_CUR_MAX == 1, otherwise for multi-byte
420      * locales we are always AsciiOnly == 0.
421      */
422     if (MB_CUR_MAX == 1) {
423 	int     k;
424 
425 	for (k = 0200; k <= 0377 && !isprint(CTL_ESC(k)); k++)
426 	    continue;
427 	AsciiOnly = k > 0377;
428     } else
429 	AsciiOnly = 0;
430 #else
431     AsciiOnly = getenv("LANG") == NULL && getenv("LC_CTYPE") == NULL;
432 #endif				/* NLS */
433     if (MapsAreInited && !NLSMapsAreInited)
434 	ed_InitNLSMaps();
435     ResetArrowKeys();
436 
437     /*
438      * Initialize for periodic command intervals. Also, initialize the dummy
439      * tty list for login-watch.
440      */
441     (void) time(&t_period);
442 #ifndef HAVENOUTMP
443     initwatch();
444 #endif /* !HAVENOUTMP */
445 
446 #if defined(alliant)
447     /*
448      * From:  Jim Pace <jdp@research.att.com>
449      * tcsh does not work properly on the alliants through an rlogin session.
450      * The shell generally hangs.  Also, reference to the controlling terminal
451      * does not work ( ie: echo foo > /dev/tty ).
452      *
453      * A security feature was added to rlogind affecting FX/80's Concentrix
454      * from revision 5.5.xx upwards (through 5.7 where this fix was implemented)
455      * This security change also affects the FX/2800 series.
456      * The security change to rlogind requires the process group of an rlogin
457      * session become disassociated with the tty in rlogind.
458      *
459      * The changes needed are:
460      * 1. set the process group
461      * 2. reenable the control terminal
462      */
463      if (loginsh && isatty(SHIN)) {
464 	 ttyn = ttyname(SHIN);
465 	 xclose(SHIN);
466 	 SHIN = xopen(ttyn, O_RDWR|O_LARGEFILE);
467 	 shpgrp = getpid();
468 	 (void) ioctl (SHIN, TIOCSPGRP, (ioctl_t) &shpgrp);
469 	 (void) setpgid(0, shpgrp);
470      }
471 #endif /* alliant */
472 
473     /*
474      * Move the descriptors to safe places. The variable didfds is 0 while we
475      * have only FSH* to work with. When didfds is true, we have 0,1,2 and
476      * prefer to use these.
477      */
478     initdesc();
479 
480     /*
481      * Get and set the tty now
482      */
483     if ((ttyn = ttyname(SHIN)) != NULL) {
484 	/*
485 	 * Could use rindex to get rid of other possible path components, but
486 	 * hpux preserves the subdirectory /pty/ when storing the tty name in
487 	 * utmp, so we keep it too.
488 	 */
489 	if (strncmp(ttyn, "/dev/", 5) == 0)
490 	    setv(STRtty, cp = SAVE(ttyn + 5), VAR_READWRITE);
491 	else
492 	    setv(STRtty, cp = SAVE(ttyn), VAR_READWRITE);
493     }
494     else
495 	setv(STRtty, cp = SAVE(""), VAR_READWRITE);
496     /*
497      * Initialize the shell variables. ARGV and PROMPT are initialized later.
498      * STATUS is also munged in several places. CHILD is munged when
499      * forking/waiting
500      */
501 
502     /*
503      * 7-10-87 Paul Placeway autologout should be set ONLY on login shells and
504      * on shells running as root.  Out of these, autologout should NOT be set
505      * for any psudo-terminals (this catches most window systems) and not for
506      * any terminal running X windows.
507      *
508      * At Ohio State, we have had problems with a user having his X session
509      * drop out from under him (on a Sun) because the shell in his master
510      * xterm timed out and exited.
511      *
512      * Really, this should be done with a program external to the shell, that
513      * watches for no activity (and NO running programs, such as dump) on a
514      * terminal for a long peroid of time, and then SIGHUPS the shell on that
515      * terminal.
516      *
517      * bugfix by Rich Salz <rsalz@PINEAPPLE.BBN.COM>: For root rsh things
518      * allways first check to see if loginsh or really root, then do things
519      * with ttyname()
520      *
521      * Also by Jean-Francois Lamy <lamy%ai.toronto.edu@RELAY.CS.NET>: check the
522      * value of cp before using it! ("root can rsh too")
523      *
524      * PWP: keep the nested ifs; the order of the tests matters and a good
525      * (smart) C compiler might re-arange things wrong.
526      */
527 #ifdef AUTOLOGOUT
528 # ifdef convex
529     if (uid == 0)
530 	/*  root always has a 15 minute autologout  */
531 	setcopy(STRautologout, STRrootdefautologout, VAR_READWRITE);
532     else
533 	if (loginsh)
534 	    /*  users get autologout set to 0  */
535 	    setcopy(STRautologout, STR0, VAR_READWRITE);
536 # else /* convex */
537     if (loginsh || (uid == 0)) {
538 	if (*cp) {
539 	    /* only for login shells or root and we must have a tty */
540 	    if (((cp2 = Strrchr(cp, (Char) '/')) != NULL) &&
541 		(Strncmp(cp, STRptssl, 3) != 0)) {
542 		cp2 = cp2 + 1;
543 	    }
544 	    else
545 		cp2 = cp;
546 	    if (!(((Strncmp(cp2, STRtty, 3) == 0) && Isalpha(cp2[3])) ||
547 	          Strstr(cp, STRptssl) != NULL)) {
548 		if (getenv("DISPLAY") == NULL) {
549 		    /* NOT on X window shells */
550 		    setcopy(STRautologout, STRdefautologout, VAR_READWRITE);
551 		}
552 	    }
553 	}
554     }
555 # endif /* convex */
556 #endif /* AUTOLOGOUT */
557 
558     sigset_interrupting(SIGALRM, queue_alrmcatch);
559 
560     setcopy(STRstatus, STR0, VAR_READWRITE);
561 
562     /*
563      * get and set machine specific environment variables
564      */
565     getmachine();
566 
567 
568     /*
569      * Publish the selected echo style
570      */
571 #if ECHO_STYLE != BSD_ECHO
572     if (tcsh) {
573 # if ECHO_STYLE == NONE_ECHO
574 	setcopy(STRecho_style, STRnone, VAR_READWRITE);
575 # endif /* ECHO_STYLE == NONE_ECHO */
576 # if ECHO_STYLE == SYSV_ECHO
577 	setcopy(STRecho_style, STRsysv, VAR_READWRITE);
578 # endif /* ECHO_STYLE == SYSV_ECHO */
579 # if ECHO_STYLE == BOTH_ECHO
580 	setcopy(STRecho_style, STRboth, VAR_READWRITE);
581 # endif /* ECHO_STYLE == BOTH_ECHO */
582     } else
583 #endif /* ECHO_STYLE != BSD_ECHO */
584 	setcopy(STRecho_style, STRbsd, VAR_READWRITE);
585 
586     /*
587      * increment the shell level.
588      */
589     shlvl(1);
590 
591     if ((tcp = getenv("HOME")) != NULL)
592 	cp = quote(SAVE(tcp));
593     else
594 #ifdef __ANDROID__
595 	/* On Android, $HOME usually isn't set, so we can't load user RC files.
596 	   Check for the environment variable EXTERNAL_STORAGE, which contains
597 	   the mount point of the external storage (SD card, mostly).  If
598 	   EXTERNAL_STORAGE isn't set fall back to "/sdcard". */
599     if ((tcp = getenv("EXTERNAL_STORAGE")) != NULL)
600 	cp = quote(SAVE(tcp));
601     else
602 	cp = quote(SAVE("/sdcard"));
603 #else
604 	cp = NULL;
605 #endif
606 
607     if (cp == NULL)
608 	fast = 1;		/* No home -> can't read scripts */
609     else
610 	setv(STRhome, cp, VAR_READWRITE);
611 
612     dinit(cp);			/* dinit thinks that HOME == cwd in a login
613 				 * shell */
614     /*
615      * Grab other useful things from the environment. Should we grab
616      * everything??
617      */
618     {
619 	char *cln, *cus, *cgr;
620 	struct passwd *pw;
621 	struct group *gr;
622 
623 
624 #ifdef apollo
625 	int     oid = getoid();
626 
627 	setv(STRoid, Itoa(oid, 0, 0), VAR_READWRITE);
628 #endif /* apollo */
629 
630 	setv(STReuid, Itoa(euid, 0, 0), VAR_READWRITE);
631 	if ((pw = xgetpwuid(euid)) == NULL)
632 	    setcopy(STReuser, STRunknown, VAR_READWRITE);
633 	else
634 	    setcopy(STReuser, str2short(pw->pw_name), VAR_READWRITE);
635 
636 	setv(STRuid, Itoa(uid, 0, 0), VAR_READWRITE);
637 
638 	setv(STRgid, Itoa(gid, 0, 0), VAR_READWRITE);
639 
640 	cln = getenv("LOGNAME");
641 	cus = getenv("USER");
642 	if (cus != NULL)
643 	    setv(STRuser, quote(SAVE(cus)), VAR_READWRITE);
644 	else if (cln != NULL)
645 	    setv(STRuser, quote(SAVE(cln)), VAR_READWRITE);
646 	else if ((pw = xgetpwuid(uid)) == NULL)
647 	    setcopy(STRuser, STRunknown, VAR_READWRITE);
648 	else
649 	    setcopy(STRuser, str2short(pw->pw_name), VAR_READWRITE);
650 	if (cln == NULL)
651 	    tsetenv(STRLOGNAME, varval(STRuser));
652 	if (cus == NULL)
653 	    tsetenv(STRKUSER, varval(STRuser));
654 
655 	cgr = getenv("GROUP");
656 	if (cgr != NULL)
657 	    setv(STRgroup, quote(SAVE(cgr)), VAR_READWRITE);
658 	else if ((gr = xgetgrgid(gid)) == NULL)
659 	    setcopy(STRgroup, STRunknown, VAR_READWRITE);
660 	else
661 	    setcopy(STRgroup, str2short(gr->gr_name), VAR_READWRITE);
662 	if (cgr == NULL)
663 	    tsetenv(STRKGROUP, varval(STRgroup));
664     }
665 
666     /*
667      * HOST may be wrong, since rexd transports the entire environment on sun
668      * 3.x Just set it again
669      */
670     {
671 	char    cbuff[MAXHOSTNAMELEN];
672 
673 	if (gethostname(cbuff, sizeof(cbuff)) >= 0) {
674 	    cbuff[sizeof(cbuff) - 1] = '\0';	/* just in case */
675 	    tsetenv(STRHOST, str2short(cbuff));
676 	}
677 	else
678 	    tsetenv(STRHOST, STRunknown);
679     }
680 
681 
682 #ifdef REMOTEHOST
683     /*
684      * Try to determine the remote host we were logged in from.
685      */
686     remotehost();
687 #endif /* REMOTEHOST */
688 
689 #ifdef apollo
690     if ((tcp = getenv("SYSTYPE")) == NULL)
691 	tcp = "bsd4.3";
692     tsetenv(STRSYSTYPE, quote(str2short(tcp)));
693 #endif /* apollo */
694 
695     /*
696      * set editing on by default, unless running under Emacs as an inferior
697      * shell.
698      * We try to do this intelligently. If $TERM is available, then it
699      * should determine if we should edit or not. $TERM is preserved
700      * across rlogin sessions, so we will not get confused if we rlogin
701      * under an emacs shell. Another advantage is that if we run an
702      * xterm under an emacs shell, then the $TERM will be set to
703      * xterm, so we are going to want to edit. Unfortunately emacs
704      * does not restore all the tty modes, so xterm is not very well
705      * set up. But this is not the shell's fault.
706      * Also don't edit if $TERM == wm, for when we're running under an ATK app.
707      * Finally, emacs compiled under terminfo, sets the terminal to dumb,
708      * so disable editing for that too.
709      *
710      * Unfortunately, in some cases the initial $TERM setting is "unknown",
711      * "dumb", or "network" which is then changed in the user's startup files.
712      * We fix this by setting noediting here if $TERM is unknown/dumb and
713      * if noediting is set, we switch on editing if $TERM is changed.
714      */
715     if ((tcp = getenv("TERM")) != NULL) {
716 	setv(STRterm, quote(SAVE(tcp)), VAR_READWRITE);
717 	noediting = strcmp(tcp, "unknown") == 0 || strcmp(tcp, "dumb") == 0 ||
718 		    strcmp(tcp, "network") == 0;
719 	editing = strcmp(tcp, "emacs") != 0 && strcmp(tcp, "wm") != 0 &&
720 		  !noediting;
721     }
722     else {
723 	noediting = 0;
724 	editing = ((tcp = getenv("EMACS")) == NULL || strcmp(tcp, "t") != 0);
725     }
726 
727     /*
728      * The 'edit' variable is either set or unset.  It doesn't
729      * need a value.  Making it 'emacs' might be confusing.
730      */
731     if (editing)
732 	setNS(STRedit);
733 
734 
735     /*
736      * still more mutability: make the complete routine automatically add the
737      * suffix of file names...
738      */
739     setNS(STRaddsuffix);
740 
741     /*
742      * Compatibility with tcsh >= 6.12 by default
743      */
744     setNS(STRcsubstnonl);
745 
746     /*
747      * Random default kill ring size
748      */
749     setcopy(STRkillring, str2short("30"), VAR_READWRITE);
750 
751     /*
752      * Re-initialize path if set in environment
753      */
754     if ((tcp = getenv("PATH")) == NULL)
755 #ifdef _PATH_DEFPATH
756 	importpath(str2short(_PATH_DEFPATH));
757 #else /* !_PATH_DEFPATH */
758 	setq(STRpath, defaultpath(), &shvhed, VAR_READWRITE);
759 #endif /* _PATH_DEFPATH */
760     else
761 	/* Importpath() allocates memory for the path, and the
762 	 * returned pointer from SAVE() was discarded, so
763 	 * this was a memory leak.. (sg)
764 	 *
765 	 * importpath(SAVE(tcp));
766 	 */
767 	importpath(str2short(tcp));
768 
769 
770     {
771 	/* If the SHELL environment variable ends with "tcsh", set
772 	 * STRshell to the same path.  This is to facilitate using
773 	 * the executable in environments where the compiled-in
774 	 * default isn't appropriate (sg).
775 	 */
776 
777 	size_t sh_len = 0;
778 
779 	if ((tcp = getenv("SHELL")) != NULL) {
780 	    sh_len = strlen(tcp);
781 	    if ((sh_len >= 5 && strcmp(tcp + (sh_len - 5), "/tcsh") == 0) ||
782 	        (!tcsh && sh_len >= 4 && strcmp(tcp + (sh_len - 4), "/csh") == 0))
783 		setv(STRshell, quote(SAVE(tcp)), VAR_READWRITE);
784 	    else
785 		sh_len = 0;
786 	}
787 	if (sh_len == 0)
788 	    setcopy(STRshell, STR_SHELLPATH, VAR_READWRITE);
789     }
790 
791 #ifdef _OSD_POSIX  /* BS2000 needs this variable set to "SHELL" */
792     if ((tcp = getenv("PROGRAM_ENVIRONMENT")) == NULL)
793 	tcp = "SHELL";
794     tsetenv(STRPROGRAM_ENVIRONMENT, quote(str2short(tcp)));
795 #endif /* _OSD_POSIX */
796 
797 #ifdef COLOR_LS_F
798     if ((tcp = getenv("LS_COLORS")) != NULL)
799 	parseLS_COLORS(str2short(tcp));
800 #endif /* COLOR_LS_F */
801 
802     doldol = putn((tcsh_number_t)getpid());	/* For $$ */
803 #ifdef WINNT_NATIVE
804     {
805 	char *tmp;
806 	Char *tmp2;
807 	if ((tmp = getenv("TMP")) != NULL) {
808 	    tmp = xasprintf("%s/%s", tmp, "sh");
809 	    tmp2 = SAVE(tmp);
810 	    xfree(tmp);
811 	}
812 	else {
813 	    tmp2 = SAVE("");
814 	}
815 	shtemp = Strspl(tmp2, doldol);	/* For << */
816 	xfree(tmp2);
817     }
818 #else /* !WINNT_NATIVE */
819 #ifdef HAVE_MKSTEMP
820     {
821 	char *tmpdir = getenv ("TMPDIR");
822 	if (!tmpdir)
823 	    tmpdir = "/tmp";
824 	shtemp = Strspl(SAVE(tmpdir), SAVE("/sh" TMP_TEMPLATE)); /* For << */
825     }
826 #else /* !HAVE_MKSTEMP */
827     shtemp = Strspl(STRtmpsh, doldol);	/* For << */
828 #endif /* HAVE_MKSTEMP */
829 #endif /* WINNT_NATIVE */
830 
831     /*
832      * Record the interrupt states from the parent process. If the parent is
833      * non-interruptible our hand must be forced or we (and our children) won't
834      * be either. Our children inherit termination from our parent. We catch it
835      * only if we are the login shell.
836      */
837     sigaction(SIGINT, NULL, &parintr);
838     sigaction(SIGTERM, NULL, &parterm);
839 
840 
841 #ifdef TCF
842     /* Enable process migration on ourselves and our progeny */
843     (void) signal(SIGMIGRATE, SIG_DFL);
844 #endif /* TCF */
845 
846     /*
847      * dspkanji/dspmbyte autosetting
848      */
849     /* PATCH IDEA FROM Issei.Suzuki VERY THANKS */
850 #if defined(DSPMBYTE)
851 #if defined(NLS) && defined(LC_CTYPE)
852     if (((tcp = setlocale(LC_CTYPE, NULL)) != NULL || (tcp = getenv("LANG")) != NULL) && !adrof(CHECK_MBYTEVAR))
853 #else
854     if ((tcp = getenv("LANG")) != NULL && !adrof(CHECK_MBYTEVAR))
855 #endif
856     {
857 	autoset_dspmbyte(str2short(tcp));
858     }
859 #if defined(WINNT_NATIVE)
860     else if (!adrof(CHECK_MBYTEVAR))
861       nt_autoset_dspmbyte();
862 #endif /* WINNT_NATIVE */
863 #endif
864 #if defined(AUTOSET_KANJI)
865 # if defined(NLS) && defined(LC_CTYPE)
866     if (setlocale(LC_CTYPE, NULL) != NULL || getenv("LANG") != NULL)
867 # else
868     if (getenv("LANG") != NULL)
869 # endif
870 	autoset_kanji();
871 #endif /* AUTOSET_KANJI */
872     fix_version();		/* publish the shell version */
873 
874     if (argc > 1 && strcmp(argv[1], "--version") == 0) {
875 	xprintf("%S\n", varval(STRversion));
876 	xexit(0);
877     }
878     if (argc > 1 && strcmp(argv[1], "--help") == 0) {
879 	xprintf("%S\n\n", varval(STRversion));
880 	xprintf("%s", CGETS(11, 8, HELP_STRING));
881 	xexit(0);
882     }
883     /*
884      * Process the arguments.
885      *
886      * Note that processing of -v/-x is actually delayed till after script
887      * processing.
888      *
889      * We set the first character of our name to be '-' if we are a shell
890      * running interruptible commands.  Many programs which examine ps'es
891      * use this to filter such shells out.
892      */
893     argc--, tempv++;
894     while (argc > 0 && (tcp = tempv[0])[0] == '-' &&
895 	   *++tcp != '\0' && !batch) {
896 	do
897 	    switch (*tcp++) {
898 
899 	    case 0:		/* -	Interruptible, no prompt */
900 		prompt = 0;
901 		setintr = 1;
902 		nofile = 1;
903 		break;
904 
905 	    case 'b':		/* -b	Next arg is input file */
906 		batch = 1;
907 		break;
908 
909 	    case 'c':		/* -c	Command input from arg */
910 		if (argc == 1)
911 		    xexit(0);
912 		argc--, tempv++;
913 #ifdef M_XENIX
914 		/* Xenix Vi bug:
915 		   it relies on a 7 bit environment (/bin/sh), so it
916 		   pass ascii arguments with the 8th bit set */
917 		if (!strcmp(argv[0], "sh"))
918 		  {
919 		    char *p;
920 
921 		    for (p = tempv[0]; *p; ++p)
922 		      *p &= ASCII;
923 		  }
924 #endif
925 		arginp = SAVE(tempv[0]);
926 
927 		/*
928 		 * we put the command into a variable
929 		 */
930 		if (arginp != NULL)
931 		    setv(STRcommand, quote(Strsave(arginp)), VAR_READWRITE);
932 
933 		/*
934 		 * * Give an error on -c arguments that end in * backslash to
935 		 * ensure that you don't make * nonportable csh scripts.
936 		 */
937 		{
938 		    int count;
939 
940 		    cp = Strend(arginp);
941 		    count = 0;
942 		    while (cp > arginp && *--cp == '\\')
943 			++count;
944 		    if ((count & 1) != 0) {
945 			exiterr = 1;
946 			stderror(ERR_ARGC);
947 		    }
948 		}
949 		prompt = 0;
950 		nofile = 1;
951 		break;
952 	    case 'd':		/* -d	Load directory stack from file */
953 		rdirs = 1;
954 		break;
955 
956 #ifdef apollo
957 	    case 'D':		/* -D	Define environment variable */
958 		{
959 		    Char *dp;
960 
961 		    cp = str2short(tcp);
962 		    if (dp = Strchr(cp, '=')) {
963 			*dp++ = '\0';
964 			tsetenv(cp, dp);
965 		    }
966 		    else
967 			tsetenv(cp, STRNULL);
968 		}
969 		*tcp = '\0'; 	/* done with this argument */
970 		break;
971 #endif /* apollo */
972 
973 	    case 'e':		/* -e	Exit on any error */
974 		exiterr = 1;
975 		break;
976 
977 	    case 'f':		/* -f	Fast start */
978 		fast = 1;
979 		break;
980 
981 	    case 'i':		/* -i	Interactive, even if !intty */
982 		intact = 1;
983 		nofile = 1;
984 		break;
985 
986 	    case 'm':		/* -m	read .cshrc (from su) */
987 		mflag = 1;
988 		break;
989 
990 	    case 'n':		/* -n	Don't execute */
991 		noexec = 1;
992 		break;
993 
994 	    case 'q':		/* -q	(Undoc'd) ... die on quit */
995 		quitit = 1;
996 		break;
997 
998 	    case 's':		/* -s	Read from std input */
999 		nofile = 1;
1000 		break;
1001 
1002 	    case 't':		/* -t	Read one line from input */
1003 		onelflg = 2;
1004 		prompt = 0;
1005 		nofile = 1;
1006 		break;
1007 
1008 	    case 'v':		/* -v	Echo hist expanded input */
1009 		nverbose = 1;	/* ... later */
1010 		break;
1011 
1012 	    case 'x':		/* -x	Echo just before execution */
1013 		nexececho = 1;	/* ... later */
1014 		break;
1015 
1016 	    case 'V':		/* -V	Echo hist expanded input */
1017 		setNS(STRverbose);	/* NOW! */
1018 		break;
1019 
1020 	    case 'X':		/* -X	Echo just before execution */
1021 		setNS(STRecho);	/* NOW! */
1022 		break;
1023 
1024 	    case 'F':
1025 		/*
1026 		 * This will cause children to be created using fork instead of
1027 		 * vfork.
1028 		 */
1029 		use_fork = 1;
1030 		break;
1031 
1032 	    case ' ':
1033 	    case '\t':
1034 	    case '\r':
1035 	    case '\n':
1036 		/*
1037 		 * for O/S's that don't do the argument parsing right in
1038 		 * "#!/foo -f " scripts
1039 		 */
1040 		break;
1041 
1042 	    default:		/* Unknown command option */
1043 		exiterr = 1;
1044 		stderror(ERR_TCSHUSAGE, tcp-1, progname);
1045 		break;
1046 
1047 	} while (*tcp);
1048 	tempv++, argc--;
1049     }
1050 
1051     if (quitit)			/* With all due haste, for debugging */
1052 	(void) signal(SIGQUIT, SIG_DFL);
1053 
1054     /*
1055      * Unless prevented by -, -c, -i, -s, or -t, if there are remaining
1056      * arguments the first of them is the name of a shell file from which to
1057      * read commands.
1058      */
1059     if (nofile == 0 && argc > 0) {
1060 	nofile = xopen(tempv[0], O_RDONLY|O_LARGEFILE);
1061 	if (nofile < 0) {
1062 	    child = 1;		/* So this ... */
1063 	    /* ... doesn't return */
1064 	    stderror(ERR_SYSTEM, tempv[0], strerror(errno));
1065 	}
1066 	xfree(ffile);
1067 	dolzero = 1;
1068 	ffile = SAVE(tempv[0]);
1069 	/*
1070 	 * Replace FSHIN. Handle /dev/std{in,out,err} specially
1071 	 * since once they are closed we cannot open them again.
1072 	 * In that case we use our own saved descriptors
1073 	 */
1074 	if ((SHIN = dmove(nofile, FSHIN)) < 0)
1075 	    switch(nofile) {
1076 	    case 0:
1077 		SHIN = FSHIN;
1078 		break;
1079 	    case 1:
1080 		SHIN = FSHOUT;
1081 		break;
1082 	    case 2:
1083 		SHIN = FSHDIAG;
1084 		break;
1085 	    default:
1086 		stderror(ERR_SYSTEM, tempv[0], strerror(errno));
1087 		break;
1088 	    }
1089 	(void) close_on_exec(SHIN, 1);
1090 	prompt = 0;
1091 	 /* argc not used any more */ tempv++;
1092     }
1093 
1094     /*
1095      * Call to closem() used to be part of initdesc(). Now called below where
1096      * the script name argument has become stdin. Kernel may have used a file
1097      * descriptor to hold the name of the script (setuid case) and this name
1098      * mustn't be lost by closing the fd too soon.
1099      */
1100     closem();
1101 
1102     /*
1103      * Consider input a tty if it really is or we are interactive. but not for
1104      * editing (christos)
1105      */
1106     if (!(intty = isatty(SHIN))) {
1107 	if (adrof(STRedit))
1108 	    unsetv(STRedit);
1109 	editing = 0;
1110     }
1111     intty |= intact;
1112 #ifndef convex
1113     if (intty || (intact && isatty(SHOUT))) {
1114 	if (!batch && (uid != euid || gid != egid)) {
1115 	    errno = EACCES;
1116 	    child = 1;		/* So this ... */
1117 	    /* ... doesn't return */
1118 	    stderror(ERR_SYSTEM, progname, strerror(errno));
1119 	}
1120     }
1121 #endif /* convex */
1122     isoutatty = isatty(SHOUT);
1123     isdiagatty = isatty(SHDIAG);
1124     /*
1125      * Decide whether we should play with signals or not. If we are explicitly
1126      * told (via -i, or -) or we are a login shell (arg0 starts with -) or the
1127      * input and output are both the ttys("csh", or "csh</dev/ttyx>/dev/ttyx")
1128      * Note that in only the login shell is it likely that parent may have set
1129      * signals to be ignored
1130      */
1131     if (loginsh || intact || (intty && isatty(SHOUT)))
1132 	setintr = 1;
1133     settell();
1134     /*
1135      * Save the remaining arguments in argv.
1136      */
1137     setq(STRargv, blk2short(tempv), &shvhed, VAR_READWRITE);
1138 
1139     /*
1140      * Set up the prompt.
1141      */
1142     if (prompt) {
1143 	setcopy(STRprompt, STRdefprompt, VAR_READWRITE);
1144 	/* that's a meta-questionmark */
1145 	setcopy(STRprompt2, STRmquestion, VAR_READWRITE);
1146 	setcopy(STRprompt3, STRKCORRECT, VAR_READWRITE);
1147     }
1148 
1149     /*
1150      * If we are an interactive shell, then start fiddling with the signals;
1151      * this is a tricky game.
1152      */
1153     shpgrp = mygetpgrp();
1154     opgrp = tpgrp = -1;
1155     if (setintr) {
1156 	struct sigaction osig;
1157 
1158 	**argv = '-';
1159 	if (!quitit)		/* Wary! */
1160 	    (void) signal(SIGQUIT, SIG_IGN);
1161 	pintr_disabled = 1;
1162 	sigset_interrupting(SIGINT, queue_pintr);
1163 	(void) signal(SIGTERM, SIG_IGN);
1164 
1165 	/*
1166 	 * No reason I can see not to save history on all these events..
1167 	 * Most usual occurrence is in a window system, where we're not a login
1168 	 * shell, but might as well be... (sg)
1169 	 * But there might be races when lots of shells exit together...
1170 	 * [this is also incompatible].
1171 	 * We have to be mre careful here. If the parent wants to
1172 	 * ignore the signals then we leave them untouched...
1173 	 * We also only setup the handlers for shells that are trully
1174 	 * interactive.
1175 	 */
1176 	sigaction(SIGHUP, NULL, &osig);
1177 	if (loginsh || osig.sa_handler != SIG_IGN)
1178 	    /* exit processing on HUP */
1179 	    sigset_interrupting(SIGHUP, queue_phup);
1180 #ifdef SIGXCPU
1181 	sigaction(SIGXCPU, NULL, &osig);
1182 	if (loginsh || osig.sa_handler != SIG_IGN)
1183 	    /* exit processing on XCPU */
1184 	    sigset_interrupting(SIGXCPU, queue_phup);
1185 #endif
1186 #ifdef SIGXFSZ
1187 	sigaction(SIGXFSZ, NULL, &osig);
1188 	if (loginsh || osig.sa_handler != SIG_IGN)
1189 	    /* exit processing on XFSZ */
1190 	    sigset_interrupting(SIGXFSZ, queue_phup);
1191 #endif
1192 
1193 	if (quitit == 0 && arginp == 0) {
1194 #ifdef SIGTSTP
1195 	    (void) signal(SIGTSTP, SIG_IGN);
1196 #endif
1197 #ifdef SIGTTIN
1198 	    (void) signal(SIGTTIN, SIG_IGN);
1199 #endif
1200 #ifdef SIGTTOU
1201 	    (void) signal(SIGTTOU, SIG_IGN);
1202 #endif
1203 	    /*
1204 	     * Wait till in foreground, in case someone stupidly runs csh &
1205 	     * dont want to try to grab away the tty.
1206 	     */
1207 	    if (isatty(FSHDIAG))
1208 		f = FSHDIAG;
1209 	    else if (isatty(FSHOUT))
1210 		f = FSHOUT;
1211 	    else if (isatty(OLDSTD))
1212 		f = OLDSTD;
1213 	    else
1214 		f = -1;
1215 
1216 #ifdef NeXT
1217 	    /* NeXT 2.0 /usr/etc/rlogind, does not set our process group! */
1218 	    if (shpgrp == 0) {
1219 	        shpgrp = getpid();
1220 		(void) setpgid(0, shpgrp);
1221 	        (void) tcsetpgrp(f, shpgrp);
1222 	    }
1223 #endif /* NeXT */
1224 #ifdef BSDJOBS			/* if we have tty job control */
1225 	    if (grabpgrp(f, shpgrp) != -1) {
1226 		/*
1227 		 * Thanks to Matt Day for the POSIX references, and to
1228 		 * Paul Close for the SGI clarification.
1229 		 */
1230 		if (setdisc(f) != -1) {
1231 		    opgrp = shpgrp;
1232 		    shpgrp = getpid();
1233 		    tpgrp = shpgrp;
1234 		    if (tcsetpgrp(f, shpgrp) == -1) {
1235 			/*
1236 			 * On hpux 7.03 this fails with EPERM. This happens on
1237 			 * the 800 when opgrp != shpgrp at this point. (we were
1238 			 * forked from a non job control shell)
1239 			 * POSIX 7.2.4, says we failed because the process
1240 			 * group specified did not belong to a process
1241 			 * in the same session with the tty. So we set our
1242 			 * process group and try again.
1243 			 */
1244 			if (setpgid(0, shpgrp) == -1) {
1245 			    xprintf("setpgid:");
1246 			    goto notty;
1247 			}
1248 			if (tcsetpgrp(f, shpgrp) == -1) {
1249 			    xprintf("tcsetpgrp:");
1250 			    goto notty;
1251 			}
1252 		    }
1253 		    /*
1254 		     * We check the process group now. If it is the same, then
1255 		     * we don't need to set it again. On hpux 7.0 on the 300's
1256 		     * if we set it again it fails with EPERM. This is the
1257 		     * correct behavior according to POSIX 4.3.3 if the process
1258 		     * was a session leader .
1259 		     */
1260 		    else if (shpgrp != mygetpgrp()) {
1261 			if(setpgid(0, shpgrp) == -1) {
1262 			    xprintf("setpgid:");
1263 			    goto notty;
1264 			}
1265 		    }
1266 #ifdef IRIS4D
1267 		    /*
1268 		     * But on irix 3.3 we need to set it again, even if it is
1269 		     * the same. We do that to tell the system that we
1270 		     * need BSD process group compatibility.
1271 		     */
1272 		    else
1273 			(void) setpgid(0, shpgrp);
1274 #endif
1275 		    (void) close_on_exec(dcopy(f, FSHTTY), 1);
1276 		}
1277 		else
1278 		    tpgrp = -1;
1279 	    }
1280 	    if (tpgrp == -1) {
1281 	notty:
1282 	        xprintf(CGETS(11, 1, "Warning: no access to tty (%s).\n"),
1283 		    strerror(errno));
1284 		xprintf("%s",
1285 		    CGETS(11, 2, "Thus no job control in this shell.\n"));
1286 		/*
1287 		 * Fix from:Sakari Jalovaara <sja@sirius.hut.fi> if we don't
1288 		 * have access to tty, disable editing too
1289 		 */
1290 		if (adrof(STRedit))
1291 		    unsetv(STRedit);
1292 		editing = 0;
1293 	    }
1294 #else	/* BSDJOBS */		/* don't have job control, so frotz it */
1295 	    tpgrp = -1;
1296 #endif				/* BSDJOBS */
1297 	}
1298     }
1299     if (setintr == 0 && parintr.sa_handler == SIG_DFL)
1300 	setintr = 1;
1301 
1302 /*
1303  * SVR4 doesn't send a SIGCHLD when a child is stopped or continued if the
1304  * handler is installed with signal(2) or sigset(2).  sigaction(2) must
1305  * be used instead.
1306  *
1307  * David Dawes (dawes@physics.su.oz.au) Sept 1991
1308  */
1309     sigset_interrupting(SIGCHLD, queue_pchild);
1310 
1311     if (intty && !arginp)
1312 	(void) ed_Setup(editing);/* Get the tty state, and set defaults */
1313 				 /* Only alter the tty state if editing */
1314 
1315     /*
1316      * Set an exit here in case of an interrupt or error reading the shell
1317      * start-up scripts.
1318      */
1319     osetintr = setintr;
1320     oparintr = parintr;
1321     (void)cleanup_push_mark(); /* There is no outer handler */
1322     if (setexit() != 0) /* PWP */
1323 	reenter = 1;
1324     else
1325 	reenter = 0;
1326     exitset++;
1327     haderr = 0;			/* In case second time through */
1328     if (!fast && reenter == 0) {
1329 	/* Will have varval(STRhome) here because set fast if don't */
1330 	{
1331 	    pintr_disabled++;
1332 	    cleanup_push(&pintr_disabled, disabled_cleanup);
1333 	    setintr = 0;/*FIXRESET:cleanup*/
1334 	    /* onintr in /etc/ files has no effect */
1335 	    parintr.sa_handler = SIG_IGN;/*FIXRESET: cleanup*/
1336 #ifdef LOGINFIRST
1337 #ifdef _PATH_DOTLOGIN
1338 	    if (loginsh)
1339 		(void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL);
1340 #endif
1341 #endif
1342 
1343 #ifdef _PATH_DOTCSHRC
1344 	    (void) srcfile(_PATH_DOTCSHRC, 0, 0, NULL);
1345 #endif
1346 	    if (!arginp && !onelflg && !havhash)
1347 		dohash(NULL,NULL);
1348 #ifndef LOGINFIRST
1349 #ifdef _PATH_DOTLOGIN
1350 	    if (loginsh)
1351 		(void) srcfile(_PATH_DOTLOGIN, 0, 0, NULL);
1352 #endif
1353 #endif
1354 	    cleanup_until(&pintr_disabled);
1355 	    setintr = osetintr;
1356 	    parintr = oparintr;
1357 	}
1358 #ifdef LOGINFIRST
1359 	if (loginsh)
1360 	    (void) srccat(varval(STRhome), STRsldotlogin);
1361 #endif
1362 	/* upward compat. */
1363 	if (!srccat(varval(STRhome), STRsldottcshrc))
1364 	    (void) srccat(varval(STRhome), STRsldotcshrc);
1365 
1366 	if (!arginp && !onelflg && !havhash)
1367 	    dohash(NULL,NULL);
1368 
1369 	/*
1370 	 * Source history before .login so that it is available in .login
1371 	 */
1372 	loadhist(NULL, 0);
1373 #ifndef LOGINFIRST
1374 	if (loginsh)
1375 	    (void) srccat(varval(STRhome), STRsldotlogin);
1376 #endif
1377 	if (loginsh || rdirs)
1378 	    loaddirs(NULL);
1379     }
1380     /* Reset interrupt flag */
1381     setintr = osetintr;
1382     parintr = oparintr;
1383     exitset--;
1384 
1385     /* Initing AFTER .cshrc is the Right Way */
1386     if (intty && !arginp) {	/* PWP setup stuff */
1387 	ed_Init();		/* init the new line editor */
1388 #ifdef SIG_WINDOW
1389 	check_window_size(1);	/* mung environment */
1390 #endif				/* SIG_WINDOW */
1391     }
1392 
1393     /*
1394      * Now are ready for the -v and -x flags
1395      */
1396     if (nverbose)
1397 	setNS(STRverbose);
1398     if (nexececho)
1399 	setNS(STRecho);
1400 
1401     /*
1402      * All the rest of the world is inside this call. The argument to process
1403      * indicates whether it should catch "error unwinds".  Thus if we are a
1404      * interactive shell our call here will never return by being blown past on
1405      * an error.
1406      */
1407     process(setintr);
1408 
1409     /*
1410      * Mop-up.
1411      */
1412     /* Take care of these (especially HUP) here instead of inside flush. */
1413     handle_pending_signals();
1414     if (intty) {
1415 	if (loginsh) {
1416 	    xprintf("logout\n");
1417 	    xclose(SHIN);
1418 	    child = 1;
1419 #ifdef TESLA
1420 	    do_logout = 1;
1421 #endif				/* TESLA */
1422 	    goodbye(NULL, NULL);
1423 	}
1424 	else {
1425 	    xprintf("exit\n");
1426 	}
1427     }
1428     record();
1429     exitstat();
1430     return (0);
1431 }
1432 
1433 void
untty(void)1434 untty(void)
1435 {
1436 #ifdef BSDJOBS
1437     if (tpgrp > 0 && opgrp != shpgrp) {
1438 	(void) setpgid(0, opgrp);
1439 	(void) tcsetpgrp(FSHTTY, opgrp);
1440 	(void) resetdisc(FSHTTY);
1441     }
1442 #endif /* BSDJOBS */
1443 }
1444 
1445 void
importpath(Char * cp)1446 importpath(Char *cp)
1447 {
1448     size_t i = 0;
1449     Char *dp;
1450     Char **pv;
1451     int     c;
1452 
1453     for (dp = cp; *dp; dp++)
1454 	if (*dp == PATHSEP)
1455 	    i++;
1456     /*
1457      * i+2 where i is the number of colons in the path. There are i+1
1458      * directories in the path plus we need room for a zero terminator.
1459      */
1460     pv = xcalloc(i + 2, sizeof(Char *));
1461     dp = cp;
1462     i = 0;
1463     if (*dp)
1464 	for (;;) {
1465 	    if ((c = *dp) == PATHSEP || c == 0) {
1466 		*dp = 0;
1467 		pv[i++] = Strsave(*cp ? cp : STRdot);
1468 		if (c) {
1469 		    cp = dp + 1;
1470 		    *dp = PATHSEP;
1471 		}
1472 		else
1473 		    break;
1474 	    }
1475 #ifdef WINNT_NATIVE
1476 	    else if (*dp == '\\')
1477 		*dp = '/';
1478 #endif /* WINNT_NATIVE */
1479 	    dp++;
1480 	}
1481     pv[i] = 0;
1482     cleanup_push(pv, blk_cleanup);
1483     setq(STRpath, pv, &shvhed, VAR_READWRITE);
1484     cleanup_ignore(pv);
1485     cleanup_until(pv);
1486 }
1487 
1488 /*
1489  * Source to the file which is the catenation of the argument names.
1490  */
1491 static int
srccat(Char * cp,Char * dp)1492 srccat(Char *cp, Char *dp)
1493 {
1494     if (cp[0] == '/' && cp[1] == '\0')
1495 	return srcfile(short2str(dp), (mflag ? 0 : 1), 0, NULL);
1496     else {
1497 	Char *ep;
1498 	char   *ptr;
1499 	int rv;
1500 
1501 #ifdef WINNT_NATIVE
1502 	ep = Strend(cp);
1503 	if (ep != cp && ep[-1] == '/' && dp[0] == '/') /* silly win95 */
1504 	    dp++;
1505 #endif /* WINNT_NATIVE */
1506 
1507 	ep = Strspl(cp, dp);
1508 	cleanup_push(ep, xfree);
1509 	ptr = short2str(ep);
1510 
1511 	rv = srcfile(ptr, (mflag ? 0 : 1), 0, NULL);
1512 	cleanup_until(ep);
1513 	return rv;
1514     }
1515 }
1516 
1517 /*
1518  * Source to a file putting the file descriptor in a safe place (> 2).
1519  */
1520 #ifndef WINNT_NATIVE
1521 static int
1522 #else
1523 int
1524 #endif /*WINNT_NATIVE*/
srcfile(const char * f,int onlyown,int flag,Char ** av)1525 srcfile(const char *f, int onlyown, int flag, Char **av)
1526 {
1527     int unit;
1528 
1529     if ((unit = xopen(f, O_RDONLY|O_LARGEFILE)) == -1)
1530 	return 0;
1531     cleanup_push(&unit, open_cleanup);
1532     unit = dmove(unit, -1);
1533     cleanup_ignore(&unit);
1534     cleanup_until(&unit);
1535 
1536     (void) close_on_exec(unit, 1);
1537     srcunit(unit, onlyown, flag, av);
1538     return 1;
1539 }
1540 
1541 
1542 /*
1543  * Save the shell state, and establish new argument vector, and new input
1544  * fd.
1545  */
1546 static void
st_save(struct saved_state * st,int unit,int hflg,Char ** al,Char ** av)1547 st_save(struct saved_state *st, int unit, int hflg, Char **al, Char **av)
1548 {
1549     st->insource	= insource;
1550     st->SHIN		= SHIN;
1551     /* Want to preserve the meaning of "source file >output".
1552      * Save old descriptors, move new 0,1,2 to safe places and assign
1553      * them to SH* and let process() redo 0,1,2 from them.
1554      *
1555      * The macro returns true if d1 and d2 are good and they point to
1556      * different things.  If you don't avoid saving duplicate
1557      * descriptors, you really limit the depth of "source" recursion
1558      * you can do because of all the open file descriptors.  -IAN!
1559      */
1560 #define NEED_SAVE_FD(d1,d2) \
1561     (fstat(d1, &s1) != -1 && fstat(d2, &s2) != -1 \
1562 	&& (s1.st_ino != s2.st_ino || s1.st_dev != s2.st_dev) )
1563 
1564     st->OLDSTD = st->SHOUT = st->SHDIAG = -1;/* test later to restore these */
1565     if (didfds) {
1566 	    struct stat s1, s2;
1567 	    if (NEED_SAVE_FD(0,OLDSTD)) {
1568 		    st->OLDSTD = OLDSTD;
1569 		    OLDSTD = dmove(0, -1);
1570 		    (void)close_on_exec(OLDSTD, 1);
1571 	    }
1572 	    if (NEED_SAVE_FD(1,SHOUT)) {
1573 		    st->SHOUT = SHOUT;
1574 		    SHOUT = dmove(1, -1);
1575 		    (void)close_on_exec(SHOUT, 1);
1576 	    }
1577 	    if (NEED_SAVE_FD(2,SHDIAG)) {
1578 		    st->SHDIAG = SHDIAG;
1579 		    SHDIAG = dmove(2, -1);
1580 		    (void)close_on_exec(SHDIAG, 1);
1581 	    }
1582 	    donefds();
1583     }
1584 
1585     st->intty		= intty;
1586     st->whyles		= whyles;
1587     st->gointr		= gointr;
1588     st->arginp		= arginp;
1589     st->evalp		= evalp;
1590     st->evalvec		= evalvec;
1591     st->alvecp		= alvecp;
1592     st->alvec		= alvec;
1593     st->onelflg		= onelflg;
1594     st->enterhist	= enterhist;
1595     st->justpr		= justpr;
1596     if (hflg)
1597 	st->HIST	= HIST;
1598     else
1599 	st->HIST	= '\0';
1600     st->cantell		= cantell;
1601     cpybin(st->B, B);
1602 
1603     /*
1604      * we can now pass arguments to source.
1605      * For compatibility we do that only if arguments were really
1606      * passed, otherwise we keep the old, global $argv like before.
1607      */
1608     if (av != NULL && *av != NULL) {
1609 	struct varent *vp;
1610 	if ((vp = adrof(STRargv)) != NULL && vp->vec != NULL)
1611 	    st->argv = saveblk(vp->vec);
1612 	else
1613 	    st->argv = NULL;
1614 	setq(STRargv, saveblk(av), &shvhed, VAR_READWRITE);
1615     }
1616     else
1617 	st->argv = NULL;
1618     st->av = av;
1619 
1620     SHIN	= unit;	/* Do this first */
1621 
1622     /* Establish new input arena */
1623     {
1624 	fbuf = NULL;
1625 	fseekp = feobp = fblocks = 0;
1626 	settell();
1627     }
1628 
1629     arginp	= 0;
1630     onelflg	= 0;
1631     intty	= isatty(SHIN);
1632     whyles	= 0;
1633     gointr	= 0;
1634     evalvec	= 0;
1635     evalp	= 0;
1636     alvec	= al;
1637     alvecp	= 0;
1638     enterhist	= hflg;
1639     if (enterhist)
1640 	HIST	= '\0';
1641     insource	= 1;
1642 }
1643 
1644 
1645 /*
1646  * Restore the shell to a saved state
1647  */
1648 static void
st_restore(void * xst)1649 st_restore(void *xst)
1650 {
1651     struct saved_state *st;
1652 
1653     st = xst;
1654     if (st->SHIN == -1)
1655 	return;
1656 
1657     /* Reset input arena */
1658     {
1659 	int i;
1660 	Char** nfbuf = fbuf;
1661 	int nfblocks = fblocks;
1662 
1663 	fblocks = 0;
1664 	fbuf = NULL;
1665 	for (i = 0; i < nfblocks; i++)
1666 	    xfree(nfbuf[i]);
1667 	xfree(nfbuf);
1668     }
1669     cpybin(B, st->B);
1670 
1671     xclose(SHIN);
1672 
1673     insource	= st->insource;
1674     SHIN	= st->SHIN;
1675     if (st->OLDSTD != -1)
1676 	xclose(OLDSTD), OLDSTD = st->OLDSTD;
1677     if (st->SHOUT != -1)
1678 	xclose(SHOUT),  SHOUT = st->SHOUT;
1679     if (st->SHDIAG != -1)
1680 	xclose(SHDIAG), SHDIAG = st->SHDIAG;
1681     arginp	= st->arginp;
1682     onelflg	= st->onelflg;
1683     evalp	= st->evalp;
1684     evalvec	= st->evalvec;
1685     alvecp	= st->alvecp;
1686     alvec	= st->alvec;
1687     intty	= st->intty;
1688     whyles	= st->whyles;
1689     gointr	= st->gointr;
1690     if (st->HIST != '\0')
1691 	HIST	= st->HIST;
1692     enterhist	= st->enterhist;
1693     cantell	= st->cantell;
1694     justpr	= st->justpr;
1695 
1696     if (st->argv != NULL)
1697 	setq(STRargv, st->argv, &shvhed, VAR_READWRITE);
1698     else if (st->av != NULL  && *st->av != NULL && adrof(STRargv) != NULL)
1699 	unsetv(STRargv);
1700 }
1701 
1702 /*
1703  * Source to a unit.  If onlyown it must be our file or our group or
1704  * we don't chance it.	This occurs on ".cshrc"s and the like.
1705  */
1706 static void
srcunit(int unit,int onlyown,int hflg,Char ** av)1707 srcunit(int unit, int onlyown, int hflg, Char **av)
1708 {
1709     struct saved_state st;
1710 
1711     st.SHIN = -1;	/* st_restore checks this */
1712 
1713     if (unit < 0)
1714 	return;
1715 
1716     if (onlyown) {
1717 	struct stat stb;
1718 
1719 	if (fstat(unit, &stb) < 0) {
1720 	    xclose(unit);
1721 	    return;
1722 	}
1723     }
1724 
1725     /* Does nothing before st_save() because st.SHIN == -1 */
1726     cleanup_push(&st, st_restore);
1727     if (setintr) {
1728 	pintr_disabled++;
1729 	cleanup_push(&pintr_disabled, disabled_cleanup);
1730     }
1731 
1732     /* Save the current state and move us to a new state */
1733     st_save(&st, unit, hflg, NULL, av);
1734 
1735     /*
1736      * Now if we are allowing commands to be interrupted, we let ourselves be
1737      * interrupted.
1738      */
1739     if (setintr) {
1740 	cleanup_until(&pintr_disabled);
1741 	pintr_disabled++;
1742 	cleanup_push(&pintr_disabled, disabled_cleanup);
1743     }
1744 
1745     process(0);		/* 0 -> blow away on errors */
1746 
1747     /* Restore the old state */
1748     cleanup_until(&st);
1749 }
1750 
1751 
1752 /*ARGSUSED*/
1753 void
goodbye(Char ** v,struct command * c)1754 goodbye(Char **v, struct command *c)
1755 {
1756     USE(v);
1757     USE(c);
1758     record();
1759 
1760     if (loginsh) {
1761 	size_t omark;
1762 	sigset_t set;
1763 
1764 	sigemptyset(&set);
1765 	signal(SIGQUIT, SIG_IGN);
1766 	sigaddset(&set, SIGQUIT);
1767 	sigprocmask(SIG_UNBLOCK, &set, NULL);
1768 	signal(SIGINT, SIG_IGN);
1769 	sigaddset(&set, SIGINT);
1770 	signal(SIGTERM, SIG_IGN);
1771 	sigaddset(&set, SIGTERM);
1772 	signal(SIGHUP, SIG_IGN);
1773 	sigaddset(&set, SIGHUP);
1774 	sigprocmask(SIG_UNBLOCK, &set, NULL);
1775 	phup_disabled = 1;
1776 	setintr = 0;		/* No interrupts after "logout" */
1777 	/* Trap errors inside .logout */
1778 	omark = cleanup_push_mark();
1779 	if (setexit() == 0) {
1780 	    if (!(adrof(STRlogout)))
1781 		setcopy(STRlogout, STRnormal, VAR_READWRITE);
1782 #ifdef _PATH_DOTLOGOUT
1783 	    (void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL);
1784 #endif
1785 	    if (adrof(STRhome))
1786 		(void) srccat(varval(STRhome), STRsldtlogout);
1787 #ifdef TESLA
1788 	    do_logout = 1;
1789 #endif /* TESLA */
1790 	}
1791 	cleanup_pop_mark(omark);
1792     }
1793     exitstat();
1794 }
1795 
1796 void
exitstat(void)1797 exitstat(void)
1798 {
1799 #ifdef PROF
1800     _mcleanup();
1801 #endif
1802     /*
1803      * Note that if STATUS is corrupted (i.e. getn bombs) then error will exit
1804      * directly because we poke child here. Otherwise we might continue
1805      * unwarrantedly (sic).
1806      */
1807     child = 1;
1808 
1809     xexit(getn(varval(STRstatus)));
1810 }
1811 
1812 /*
1813  * in the event of a HUP we want to save the history
1814  */
1815 void
phup(void)1816 phup(void)
1817 {
1818     if (loginsh) {
1819 	setcopy(STRlogout, STRhangup, VAR_READWRITE);
1820 #ifdef _PATH_DOTLOGOUT
1821 	(void) srcfile(_PATH_DOTLOGOUT, 0, 0, NULL);
1822 #endif
1823 	if (adrof(STRhome))
1824 	    (void) srccat(varval(STRhome), STRsldtlogout);
1825     }
1826 
1827     record();
1828 
1829 #ifdef POSIXJOBS
1830     /*
1831      * We kill the last foreground process group. It then becomes
1832      * responsible to propagate the SIGHUP to its progeny.
1833      */
1834     {
1835 	struct process *pp, *np;
1836 
1837 	for (pp = proclist.p_next; pp; pp = pp->p_next) {
1838 	    np = pp;
1839 	    /*
1840 	     * Find if this job is in the foreground. It could be that
1841 	     * the process leader has exited and the foreground flag
1842 	     * is cleared for it.
1843 	     */
1844 	    do
1845 		/*
1846 		 * If a process is in the foreground we try to kill
1847 		 * it's process group. If we succeed, then the
1848 		 * whole job is gone. Otherwise we keep going...
1849 		 * But avoid sending HUP to the shell again.
1850 		 */
1851 		if (((np->p_flags & PFOREGND) != 0) && np->p_jobid != shpgrp) {
1852 		    np->p_flags &= ~PHUP;
1853 		    if (killpg(np->p_jobid, SIGHUP) != -1) {
1854 			/* In case the job was suspended... */
1855 #ifdef SIGCONT
1856 			(void) killpg(np->p_jobid, SIGCONT);
1857 #endif
1858 			break;
1859 		    }
1860 		}
1861 	    while ((np = np->p_friends) != pp);
1862 	}
1863     }
1864 #endif /* POSIXJOBS */
1865 
1866     xexit(SIGHUP);
1867 }
1868 
1869 static Char   *jobargv[2] = {STRjobs, 0};
1870 
1871 /*
1872  * Catch an interrupt, e.g. during lexical input.
1873  * If we are an interactive shell, we reset the interrupt catch
1874  * immediately.  In any case we drain the shell output,
1875  * and finally go through the normal error mechanism, which
1876  * gets a chance to make the shell go away.
1877  */
1878 int just_signaled;		/* bugfix by Michael Bloom (mg@ttidca.TTI.COM) */
1879 
1880 void
pintr(void)1881 pintr(void)
1882 {
1883     just_signaled = 1;
1884     pintr1(1);
1885 }
1886 
1887 void
pintr1(int wantnl)1888 pintr1(int wantnl)
1889 {
1890     if (setintr) {
1891 	if (pjobs) {
1892 	    pjobs = 0;
1893 	    xputchar('\n');
1894 	    dojobs(jobargv, NULL);
1895 	    stderror(ERR_NAME | ERR_INTR);
1896 	}
1897     }
1898     /* MH - handle interrupted completions specially */
1899     {
1900 	if (InsideCompletion)
1901 	    stderror(ERR_SILENT);
1902     }
1903     /* JV - Make sure we shut off inputl */
1904     {
1905 	(void) Cookedmode();
1906 	GettingInput = 0;
1907     }
1908     drainoline();
1909 #ifdef HAVE_GETPWENT
1910     (void) endpwent();
1911 #endif
1912 
1913     /*
1914      * If we have an active "onintr" then we search for the label. Note that if
1915      * one does "onintr -" then we shan't be interruptible so we needn't worry
1916      * about that here.
1917      */
1918     if (gointr) {
1919 	gotolab(gointr);
1920 	reset();
1921     }
1922     else if (intty && wantnl) {
1923 	if (editing) {
1924 	    /*
1925 	     * If we are editing a multi-line input command, and move to
1926 	     * the beginning of the line, we don't want to trash it when
1927 	     * we hit ^C
1928 	     */
1929 	    PastBottom();
1930 	    ClearLines();
1931 	    ClearDisp();
1932 	}
1933 	else {
1934 	    /* xputchar('\n'); *//* Some like this, others don't */
1935 	    (void) putraw('\r');
1936 	    (void) putraw('\n');
1937 	}
1938     }
1939     stderror(ERR_SILENT);
1940 }
1941 
1942 /*
1943  * Process is the main driving routine for the shell.
1944  * It runs all command processing, except for those within { ... }
1945  * in expressions (which is run by a routine evalav in sh.exp.c which
1946  * is a stripped down process), and `...` evaluation which is run
1947  * also by a subset of this code in sh.glob.c in the routine backeval.
1948  *
1949  * The code here is a little strange because part of it is interruptible
1950  * and hence freeing of structures appears to occur when none is necessary
1951  * if this is ignored.
1952  *
1953  * Note that if catch is not set then we will unwind on any error.
1954  * If an end-of-file occurs, we return.
1955  */
1956 void
process(int catch)1957 process(int catch)
1958 {
1959     jmp_buf_t osetexit;
1960     /* PWP: This might get nuked by longjmp so don't make it a register var */
1961     size_t omark;
1962     volatile int didexitset = 0;
1963 
1964     getexit(osetexit);
1965     omark = cleanup_push_mark();
1966     for (;;) {
1967 	struct command *t;
1968 	int hadhist, old_pintr_disabled;
1969 
1970 	(void)setexit();
1971 	if (didexitset == 0) {
1972 	    exitset++;
1973 	    didexitset++;
1974 	}
1975 	pendjob();
1976 
1977 	justpr = enterhist;	/* execute if not entering history */
1978 
1979 	if (haderr) {
1980 	    if (!catch) {
1981 		/* unwind */
1982 		doneinp = 0;
1983 		cleanup_pop_mark(omark);
1984 		resexit(osetexit);
1985 		reset();
1986 	    }
1987 	    haderr = 0;
1988 	    /*
1989 	     * Every error is eventually caught here or the shell dies.  It is
1990 	     * at this point that we clean up any left-over open files, by
1991 	     * closing all but a fixed number of pre-defined files.  Thus
1992 	     * routines don't have to worry about leaving files open due to
1993 	     * deeper errors... they will get closed here.
1994 	     */
1995 	    closem();
1996 	    continue;
1997 	}
1998 	if (doneinp) {
1999 	    doneinp = 0;
2000 	    break;
2001 	}
2002 	if (chkstop)
2003 	    chkstop--;
2004 	if (neednote)
2005 	    pnote();
2006 	if (intty && prompt && evalvec == 0) {
2007 	    just_signaled = 0;
2008 	    mailchk();
2009 	    /*
2010 	     * Watch for logins/logouts. Next is scheduled commands stored
2011 	     * previously using "sched." Then execute periodic commands.
2012 	     * Following that, the prompt precmd is run.
2013 	     */
2014 #ifndef HAVENOUTMP
2015 	    watch_login(0);
2016 #endif /* !HAVENOUTMP */
2017 	    sched_run();
2018 	    period_cmd();
2019 	    precmd();
2020 	    /*
2021 	     * If we are at the end of the input buffer then we are going to
2022 	     * read fresh stuff. Otherwise, we are rereading input and don't
2023 	     * need or want to prompt.
2024 	     */
2025 	    if (fseekp == feobp && aret == TCSH_F_SEEK)
2026 		printprompt(0, NULL);
2027 	    flush();
2028 	    setalarm(1);
2029 	}
2030 	if (seterr) {
2031 	    xfree(seterr);
2032 	    seterr = NULL;
2033 	}
2034 
2035 	/*
2036 	 * Interruptible during interactive reads
2037 	 */
2038 	if (setintr)
2039 	    pintr_push_enable(&old_pintr_disabled);
2040 	hadhist = lex(&paraml);
2041 	if (setintr)
2042 	    cleanup_until(&old_pintr_disabled);
2043 	cleanup_push(&paraml, lex_cleanup);
2044 
2045 	/*
2046 	 * Echo not only on VERBOSE, but also with history expansion. If there
2047 	 * is a lexical error then we forego history echo.
2048 	 * Do not echo if we're only entering history (source -h).
2049 	 */
2050 	if ((hadhist && !seterr && intty && !tellwhat && !Expand && !whyles) ||
2051 	    (!enterhist && adrof(STRverbose)))
2052 	{
2053 	    int odidfds = didfds;
2054 	    haderr = 1;
2055 	    didfds = 0;
2056 	    prlex(&paraml);
2057 	    flush();
2058 	    haderr = 0;
2059 	    didfds = odidfds;
2060 	}
2061 	(void) alarm(0);	/* Autologout OFF */
2062 	alrmcatch_disabled = 1;
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 	    goto cmd_done;
2089 
2090 	/*
2091 	 * If had a tellwhat from twenex() then do
2092 	 */
2093 	if (tellwhat) {
2094 	    (void) tellmewhat(&paraml, NULL);
2095 	    goto cmd_done;
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 	t = syntax(paraml.next, &paraml, 0);
2117 	/*
2118 	 * We cannot cleanup push here, because cd /blah; echo foo
2119 	 * would rewind t on the chdir error, and free the rest of the command
2120 	 */
2121 	if (seterr) {
2122 	    freesyn(t);
2123 	    stderror(ERR_OLD);
2124 	}
2125 
2126 	postcmd();
2127 	/*
2128 	 * Execute the parse tree From: Michael Schroeder
2129 	 * <mlschroe@immd4.informatik.uni-erlangen.de> was execute(t, tpgrp);
2130 	 */
2131 	execute(t, (tpgrp > 0 ? tpgrp : -1), NULL, NULL, TRUE);
2132 	freesyn(t);
2133 
2134 	/*
2135 	 * Made it!
2136 	 */
2137 #ifdef SIG_WINDOW
2138 	if (windowchg || (catch && intty && !whyles && !tellwhat)) {
2139 	    (void) check_window_size(0);	/* for window systems */
2140 	}
2141 #endif /* SIG_WINDOW */
2142 	setcopy(STR_, InputBuf, VAR_READWRITE | VAR_NOGLOB);
2143     cmd_done:
2144 	if (cleanup_reset())
2145 	    cleanup_until(&paraml);
2146 	else
2147 	    haderr = 1;
2148     }
2149     cleanup_pop_mark(omark);
2150     resexit(osetexit);
2151     exitset--;
2152     handle_pending_signals();
2153 }
2154 
2155 /*ARGSUSED*/
2156 void
dosource(Char ** t,struct command * c)2157 dosource(Char **t, struct command *c)
2158 {
2159     Char *f;
2160     int    hflg = 0;
2161     char *file;
2162 
2163     USE(c);
2164     t++;
2165     if (*t && eq(*t, STRmh)) {
2166 	if (*++t == NULL)
2167 	    stderror(ERR_NAME | ERR_HFLAG);
2168 	hflg++;
2169     }
2170     else if (*t && eq(*t, STRmm)) {
2171     	if (*++t == NULL)
2172 	    stderror(ERR_NAME | ERR_MFLAG);
2173 	hflg = 2;
2174     }
2175 
2176     f = globone(*t++, G_ERROR);
2177     file = strsave(short2str(f));
2178     cleanup_push(file, xfree);
2179     xfree(f);
2180     t = glob_all_or_error(t);
2181     if ((!srcfile(file, 0, hflg, t)) && (!hflg) && (!bequiet))
2182 	stderror(ERR_SYSTEM, file, strerror(errno));
2183     cleanup_until(file);
2184 }
2185 
2186 /*
2187  * Check for mail.
2188  * If we are a login shell, then we don't want to tell
2189  * about any mail file unless its been modified
2190  * after the time we started.
2191  * This prevents us from telling the user things he already
2192  * knows, since the login program insists on saying
2193  * "You have mail."
2194  */
2195 
2196 /*
2197  * The AMS version.
2198  * This version checks if the file is a directory, and if so,
2199  * tells you the number of files in it, otherwise do the old thang.
2200  * The magic "+1" in the time calculation is to compensate for
2201  * an AFS bug where directory mtimes are set to 1 second in
2202  * the future.
2203  */
2204 
2205 static void
mailchk(void)2206 mailchk(void)
2207 {
2208     struct varent *v;
2209     Char **vp;
2210     time_t  t;
2211     int     intvl, cnt;
2212     struct stat stb;
2213     int    new;
2214 
2215     v = adrof(STRmail);
2216     if (v == NULL || v->vec == NULL)
2217 	return;
2218     (void) time(&t);
2219     vp = v->vec;
2220     cnt = blklen(vp);
2221     intvl = (cnt && number(*vp)) ? (--cnt, getn(*vp++)) : MAILINTVL;
2222     if (intvl < 1)
2223 	intvl = 1;
2224     if (chktim + intvl > t)
2225 	return;
2226     for (; *vp; vp++) {
2227 	char *filename = short2str(*vp);
2228 	char *mboxdir = filename;
2229 
2230 	if (stat(filename, &stb) < 0)
2231 	    continue;
2232 #if defined(BSDTIMES) || defined(_SEQUENT_)
2233 	new = stb.st_mtime > time0.tv_sec;
2234 #else
2235 	new = stb.st_mtime > seconds0;
2236 #endif
2237 	if (S_ISDIR(stb.st_mode)) {
2238 	    DIR *mailbox;
2239 	    int mailcount = 0;
2240 	    char *tempfilename;
2241 	    struct stat stc;
2242 
2243 	    tempfilename = xasprintf("%s/new", filename);
2244 
2245 	    if (stat(tempfilename, &stc) != -1 && S_ISDIR(stc.st_mode)) {
2246 		/*
2247 		 * "filename/new" exists and is a directory; you are
2248 		 * using Qmail.
2249 		 */
2250 		stb = stc;
2251 #if defined(BSDTIMES) || defined(_SEQUENT_)
2252 		new = stb.st_mtime > time0.tv_sec;
2253 #else
2254 		new = stb.st_mtime > seconds0;
2255 #endif
2256 		mboxdir = tempfilename;
2257 	    }
2258 
2259 	    if (stb.st_mtime <= chktim + 1 || (loginsh && !new)) {
2260 		xfree(tempfilename);
2261 		continue;
2262 	    }
2263 
2264 	    mailbox = opendir(mboxdir);
2265 	    xfree(tempfilename);
2266 	    if (mailbox == NULL)
2267 		continue;
2268 
2269 	    /* skip . and .. */
2270 	    if (!readdir(mailbox) || !readdir(mailbox)) {
2271 		(void)closedir(mailbox);
2272 		continue;
2273 	    }
2274 
2275 	    while (readdir(mailbox))
2276 		mailcount++;
2277 
2278 	    (void)closedir(mailbox);
2279 	    if (mailcount == 0)
2280 		continue;
2281 
2282 	    if (cnt == 1)
2283 		xprintf(CGETS(11, 3, "You have %d mail messages.\n"),
2284 			mailcount);
2285 	    else
2286 		xprintf(CGETS(11, 4, "You have %d mail messages in %s.\n"),
2287 			mailcount, filename);
2288 	}
2289 	else {
2290 	    char *type;
2291 
2292 	    if (stb.st_size == 0 || stb.st_atime >= stb.st_mtime ||
2293 		(stb.st_atime <= chktim && stb.st_mtime <= chktim) ||
2294 		(loginsh && !new))
2295 		continue;
2296 	    type = strsave(new ? CGETS(11, 6, "new ") : "");
2297 	    cleanup_push(type, xfree);
2298 	    if (cnt == 1)
2299 		xprintf(CGETS(11, 5, "You have %smail.\n"), type);
2300 	    else
2301 	        xprintf(CGETS(11, 7, "You have %smail in %s.\n"), type, filename);
2302 	    cleanup_until(type);
2303 	}
2304     }
2305     chktim = t;
2306 }
2307 
2308 /*
2309  * Extract a home directory from the password file
2310  * The argument points to a buffer where the name of the
2311  * user whose home directory is sought is currently.
2312  * We return home directory of the user, or NULL.
2313  */
2314 Char *
gethdir(const Char * home)2315 gethdir(const Char *home)
2316 {
2317     Char   *h;
2318 
2319     /*
2320      * Is it us?
2321      */
2322     if (*home == '\0') {
2323 	if ((h = varval(STRhome)) != STRNULL)
2324 	    return Strsave(h);
2325 	else
2326 	    return NULL;
2327     }
2328 
2329     /*
2330      * Look in the cache
2331      */
2332     if ((h = gettilde(home)) == NULL)
2333 	return NULL;
2334     else
2335 	return Strsave(h);
2336 }
2337 
2338 /*
2339  * Move the initial descriptors to their eventual
2340  * resting places, closing all other units.
2341  */
2342 void
initdesc(void)2343 initdesc(void)
2344 {
2345 #ifdef NLS_BUGS
2346 #ifdef NLS_CATALOGS
2347     nlsclose();
2348 #endif /* NLS_CATALOGS */
2349 #endif /* NLS_BUGS */
2350 
2351 
2352     didfds = 0;			/* 0, 1, 2 aren't set up */
2353     (void) close_on_exec(SHIN = dcopy(0, FSHIN), 1);
2354     (void) close_on_exec(SHOUT = dcopy(1, FSHOUT), 1);
2355     (void) close_on_exec(SHDIAG = dcopy(2, FSHDIAG), 1);
2356     (void) close_on_exec(OLDSTD = dcopy(SHIN, FOLDSTD), 1);
2357 #ifndef CLOSE_ON_EXEC
2358     didcch = 0;			/* Havent closed for child */
2359 #endif /* CLOSE_ON_EXEC */
2360     if (SHDIAG >= 0)
2361 	isdiagatty = isatty(SHDIAG);
2362     else
2363     	isdiagatty = 0;
2364     if (SHDIAG >= 0)
2365 	isoutatty = isatty(SHOUT);
2366     else
2367     	isoutatty = 0;
2368 #ifdef NLS_BUGS
2369 #ifdef NLS_CATALOGS
2370     nlsinit();
2371 #endif /* NLS_CATALOGS */
2372 #endif /* NLS_BUGS */
2373 }
2374 
2375 
2376 void
2377 #ifdef PROF
done(int i)2378 done(int i)
2379 #else
2380 xexit(int i)
2381 #endif
2382 {
2383 #ifdef TESLA
2384     if (loginsh && do_logout) {
2385 	/* this is to send hangup signal to the develcon */
2386 	/* we toggle DTR. clear dtr - sleep 1 - set dtr */
2387 	/* ioctl will return ENOTTY for pty's but we ignore it 	 */
2388 	/* exitstat will run after disconnect */
2389 	/* we sleep for 2 seconds to let things happen in */
2390 	/* .logout and rechist() */
2391 #ifdef TIOCCDTR
2392 	(void) sleep(2);
2393 	(void) ioctl(FSHTTY, TIOCCDTR, NULL);
2394 	(void) sleep(1);
2395 	(void) ioctl(FSHTTY, TIOCSDTR, NULL);
2396 #endif /* TIOCCDTR */
2397     }
2398 #endif /* TESLA */
2399 
2400     {
2401 	struct process *pp, *np;
2402 	pid_t mypid = getpid();
2403 	/* Kill all processes marked for hup'ing */
2404 	for (pp = proclist.p_next; pp; pp = pp->p_next) {
2405 	    np = pp;
2406 	    do
2407 		if ((np->p_flags & PHUP) && np->p_jobid != shpgrp &&
2408 		    np->p_parentid == mypid) {
2409 		    if (killpg(np->p_jobid, SIGHUP) != -1) {
2410 			/* In case the job was suspended... */
2411 #ifdef SIGCONT
2412 			(void) killpg(np->p_jobid, SIGCONT);
2413 #endif
2414 			break;
2415 		    }
2416 		}
2417 	    while ((np = np->p_friends) != pp);
2418 	}
2419     }
2420     untty();
2421 #ifdef NLS_CATALOGS
2422     /*
2423      * We need to call catclose, because SVR4 leaves symlinks behind otherwise
2424      * in the catalog directories. We cannot close on a vforked() child,
2425      * because messages will stop working on the parent too.
2426      */
2427     if (child == 0)
2428 	nlsclose();
2429 #endif /* NLS_CATALOGS */
2430 #ifdef WINNT_NATIVE
2431     nt_cleanup();
2432 #endif /* WINNT_NATIVE */
2433     _exit(i);
2434 }
2435 
2436 #ifndef _PATH_DEFPATH
2437 static Char **
defaultpath(void)2438 defaultpath(void)
2439 {
2440     char   *ptr;
2441     Char  **blk, **blkp;
2442     struct stat stb;
2443 
2444     blkp = blk = xmalloc(sizeof(Char *) * 10);
2445 
2446 #ifndef NODOT
2447 # ifndef DOTLAST
2448     *blkp++ = Strsave(STRdot);
2449 # endif
2450 #endif
2451 
2452 #define DIRAPPEND(a)  \
2453 	if (stat(ptr = a, &stb) == 0 && S_ISDIR(stb.st_mode)) \
2454 		*blkp++ = SAVE(ptr)
2455 
2456 #ifdef _PATH_LOCAL
2457     DIRAPPEND(_PATH_LOCAL);
2458 #endif
2459 
2460 #ifdef _PATH_USRUCB
2461     DIRAPPEND(_PATH_USRUCB);
2462 #endif
2463 
2464 #ifdef _PATH_USRBSD
2465     DIRAPPEND(_PATH_USRBSD);
2466 #endif
2467 
2468 #ifdef _PATH_BIN
2469     DIRAPPEND(_PATH_BIN);
2470 #endif
2471 
2472 #ifdef _PATH_USRBIN
2473     DIRAPPEND(_PATH_USRBIN);
2474 #endif
2475 
2476 #undef DIRAPPEND
2477 
2478 #ifndef NODOT
2479 # ifdef DOTLAST
2480     *blkp++ = Strsave(STRdot);
2481 # endif
2482 #endif
2483     *blkp = NULL;
2484     return (blk);
2485 }
2486 #endif
2487 
2488 static void
record(void)2489 record(void)
2490 {
2491     if (!fast) {
2492 	recdirs(NULL, adrof(STRsavedirs) != NULL);
2493 	rechist(NULL, adrof(STRsavehist) != NULL);
2494     }
2495     displayHistStats("Exiting");	/* no-op unless DEBUG_HIST */
2496 }
2497 
2498 /*
2499  * Grab the tty repeatedly, and give up if we are not in the correct
2500  * tty process group.
2501  */
2502 int
grabpgrp(int fd,pid_t desired)2503 grabpgrp(int fd, pid_t desired)
2504 {
2505     struct sigaction old;
2506     pid_t pgrp;
2507     size_t i;
2508 
2509     for (i = 0; i < 100; i++) {
2510 	if ((pgrp = tcgetpgrp(fd)) == -1)
2511 	    return -1;
2512 	if (pgrp == desired)
2513 	    return 0;
2514 	(void)sigaction(SIGTTIN, NULL, &old);
2515 	(void)signal(SIGTTIN, SIG_DFL);
2516 	(void)kill(0, SIGTTIN);
2517 	(void)sigaction(SIGTTIN, &old, NULL);
2518     }
2519     errno = EPERM;
2520     return -1;
2521 }
2522