1 /*
2 * sh.sem.c: I/O redirections and job forking. A touchy issue!
3 * Most stuff with builtins is incorrect
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 #include "sh.h"
34 #include "tc.h"
35 #include "tw.h"
36 #ifdef WINNT_NATIVE
37 #include "nt.const.h"
38 #endif /*WINNT_NATIVE*/
39
40 #ifdef CLOSE_ON_EXEC
41 # ifndef SUNOS4
42 # ifndef CLEX_DUPS
43 # define CLEX_DUPS
44 # endif /* CLEX_DUPS */
45 # endif /* !SUNOS4 */
46 #endif /* CLOSE_ON_EXEC */
47
48 #if defined(__sparc__) || defined(sparc)
49 # if !defined(MACH) && SYSVREL == 0 && !defined(Lynx) && !defined(BSD4_4) && !defined(__linux__) && !defined(__GNU__) && !defined(__GLIBC__)
50 # include <vfork.h>
51 # endif /* !MACH && SYSVREL == 0 && !Lynx && !BSD4_4 && !glibc */
52 #endif /* __sparc__ || sparc */
53
54 #ifdef VFORK
55 static void vffree (int);
56 #endif
57 static Char *splicepipe (struct command *, Char *);
58 static void doio (struct command *, int *, int *);
59 static void chkclob (const char *);
60
61 /*
62 * C shell
63 */
64
65 /*
66 * For SVR4, there are problems with pipelines having the first process as
67 * the group leader. The problem occurs when the first process exits before
68 * the others have a chance to setpgid(). This is because in SVR4 you can't
69 * have a zombie as a group leader. The solution I have used is to reverse
70 * the order in which pipelines are started, making the last process the
71 * group leader. (Note I am not using 'pipeline' in the generic sense -- I
72 * mean processes connected by '|'.) I don't know yet if this causes other
73 * problems.
74 *
75 * All the changes for this are in execute(), and are enclosed in
76 * '#ifdef BACKPIPE'
77 *
78 * David Dawes (dawes@physics.su.oz.au) Oct 1991
79 */
80
81 /*VARARGS 1*/
82 void
execute(struct command * t,volatile int wanttty,int * pipein,int * pipeout,int do_glob)83 execute(struct command *t, volatile int wanttty, int *pipein, int *pipeout,
84 int do_glob)
85 {
86 int forked = 0;
87 const struct biltins * volatile bifunc;
88 pid_t pid = 0;
89 int pv[2];
90 sigset_t set;
91 static sigset_t csigset;
92 #ifdef VFORK
93 static int onosigchld = 0;
94 #endif /* VFORK */
95 static int nosigchld = 0;
96
97 (void) &wanttty;
98 (void) &forked;
99 (void) &bifunc;
100
101 if (t == 0)
102 return;
103
104 #ifdef WINNT_NATIVE
105 {
106 if ((varval(STRNTslowexec) == STRNULL) &&
107 !t->t_dcdr && !t->t_dcar && !t->t_dflg && !didfds &&
108 (intty || intact) && (t->t_dtyp == NODE_COMMAND) &&
109 !isbfunc(t)) {
110 if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
111 (void) Strcpy(t->t_dcom[0], t->t_dcom[0] + 1);
112 Dfix(t);
113 if (nt_try_fast_exec(t) == 0)
114 return;
115 }
116 }
117 #endif /* WINNT_NATIVE */
118
119 /*
120 * Ed hutchins@sgi.com & Dominic dbg@sgi.com
121 * Sat Feb 25 03:13:11 PST 1995
122 * try implicit cd if we have a 1 word command
123 */
124 if (implicit_cd && (intty || intact) && t->t_dcom && t->t_dcom[0] &&
125 t->t_dcom[0][0] && (blklen(t->t_dcom) == 1) && !noexec) {
126 Char *sCName;
127 struct stat stbuf;
128 char *pathname;
129
130 sCName = dollar(t->t_dcom[0]);
131 if (sCName != NULL && sCName[0] == '~') {
132 struct Strbuf buf = Strbuf_INIT;
133 const Char *name_end;
134
135 for (name_end = sCName + 1; *name_end != '\0' && *name_end != '/';
136 name_end++)
137 continue;
138 if (name_end != sCName + 1) {
139 Char *name, *home;
140
141 name = Strnsave(sCName + 1, name_end - (sCName + 1));
142 home = gethdir(name);
143 if (home != NULL) {
144 Strbuf_append(&buf, home);
145 xfree(home);
146 } else
147 Strbuf_append(&buf, name);
148 xfree(name);
149 } else
150 Strbuf_append(&buf, varval(STRhome));
151 Strbuf_append(&buf, name_end);
152 xfree(sCName);
153 sCName = Strbuf_finish(&buf);
154 }
155
156 pathname = short2str(sCName);
157 xfree(sCName);
158 /* if this is a dir, tack a "cd" on as the first arg */
159 if (pathname != NULL &&
160 ((stat(pathname, &stbuf) != -1 && S_ISDIR(stbuf.st_mode))
161 #ifdef WINNT_NATIVE
162 || (pathname[0] && pathname[1] == ':' && pathname[2] == '\0')
163 #endif /* WINNT_NATIVE */
164 )) {
165 Char *vCD[2];
166 Char **ot_dcom = t->t_dcom;
167
168 vCD[0] = Strsave(STRcd);
169 vCD[1] = NULL;
170 t->t_dcom = blkspl(vCD, ot_dcom);
171 xfree(ot_dcom);
172 if (implicit_cd > 1) {
173 blkpr(t->t_dcom);
174 xputchar( '\n' );
175 }
176 }
177 }
178
179 /*
180 * From: Michael Schroeder <mlschroe@immd4.informatik.uni-erlangen.de>
181 * Don't check for wantty > 0...
182 */
183 if (t->t_dflg & F_AMPERSAND)
184 wanttty = 0;
185 switch (t->t_dtyp) {
186
187 case NODE_COMMAND:
188 if ((t->t_dcom[0][0] & (QUOTE | TRIM)) == QUOTE)
189 memmove(t->t_dcom[0], t->t_dcom[0] + 1,
190 (Strlen(t->t_dcom[0] + 1) + 1) * sizeof (*t->t_dcom[0]));
191 if ((t->t_dflg & F_REPEAT) == 0)
192 Dfix(t); /* $ " ' \ */
193 if (t->t_dcom[0] == 0) {
194 return;
195 }
196 /*FALLTHROUGH*/
197
198 case NODE_PAREN:
199 #ifdef BACKPIPE
200 if (t->t_dflg & F_PIPEIN)
201 mypipe(pipein);
202 #else /* !BACKPIPE */
203 if (t->t_dflg & F_PIPEOUT)
204 mypipe(pipeout);
205 #endif /* BACKPIPE */
206 /*
207 * Must do << early so parent will know where input pointer should be.
208 * If noexec then this is all we do.
209 */
210 if (t->t_dflg & F_READ) {
211 int old_pintr_disabled;
212
213 xclose(0);
214 if (setintr)
215 pintr_push_enable(&old_pintr_disabled);
216 heredoc(t->t_dlef);
217 if (setintr)
218 cleanup_until(&old_pintr_disabled);
219 if (noexec)
220 xclose(0);
221 }
222
223 setstatus(0);
224
225 /*
226 * This mess is the necessary kludge to handle the prefix builtins:
227 * nice, nohup, time. These commands can also be used by themselves,
228 * and this is not handled here. This will also work when loops are
229 * parsed.
230 */
231 while (t->t_dtyp == NODE_COMMAND)
232 if (eq(t->t_dcom[0], STRnice)) {
233 if (t->t_dcom[1]) {
234 if (strchr("+-", t->t_dcom[1][0])) {
235 if (t->t_dcom[2]) {
236 setname("nice");
237 t->t_nice = (unsigned char)getn(t->t_dcom[1]);
238 lshift(t->t_dcom, 2);
239 t->t_dflg |= F_NICE;
240 }
241 else
242 break;
243 }
244 else {
245 t->t_nice = 4;
246 lshift(t->t_dcom, 1);
247 t->t_dflg |= F_NICE;
248 }
249 }
250 else
251 break;
252 }
253 else if (eq(t->t_dcom[0], STRnohup)) {
254 if (t->t_dcom[1]) {
255 t->t_dflg |= F_NOHUP;
256 lshift(t->t_dcom, 1);
257 }
258 else
259 break;
260 }
261 else if (eq(t->t_dcom[0], STRhup)) {
262 if (t->t_dcom[1]) {
263 t->t_dflg |= F_HUP;
264 lshift(t->t_dcom, 1);
265 }
266 else
267 break;
268 }
269 else if (eq(t->t_dcom[0], STRtime)) {
270 if (t->t_dcom[1]) {
271 t->t_dflg |= F_TIME;
272 lshift(t->t_dcom, 1);
273 }
274 else
275 break;
276 }
277 #ifdef F_VER
278 else if (eq(t->t_dcom[0], STRver))
279 if (t->t_dcom[1] && t->t_dcom[2]) {
280 setname("ver");
281 t->t_systype = getv(t->t_dcom[1]);
282 lshift(t->t_dcom, 2);
283 t->t_dflg |= F_VER;
284 }
285 else
286 break;
287 #endif /* F_VER */
288 else
289 break;
290
291 /* is it a command */
292 if (t->t_dtyp == NODE_COMMAND) {
293 /*
294 * Check if we have a builtin function and remember which one.
295 */
296 bifunc = isbfunc(t);
297 if (noexec) {
298 /*
299 * Continue for builtins that are part of the scripting language
300 */
301 if (bifunc == NULL)
302 break;
303 if (bifunc->bfunct != (bfunc_t)dobreak &&
304 bifunc->bfunct != (bfunc_t)docontin &&
305 bifunc->bfunct != (bfunc_t)doelse &&
306 bifunc->bfunct != (bfunc_t)doend &&
307 bifunc->bfunct != (bfunc_t)doforeach&&
308 bifunc->bfunct != (bfunc_t)dogoto &&
309 bifunc->bfunct != (bfunc_t)doif &&
310 bifunc->bfunct != (bfunc_t)dorepeat &&
311 bifunc->bfunct != (bfunc_t)doswbrk &&
312 bifunc->bfunct != (bfunc_t)doswitch &&
313 bifunc->bfunct != (bfunc_t)dowhile &&
314 bifunc->bfunct != (bfunc_t)dozip)
315 break;
316 }
317 }
318 else { /* not a command */
319 bifunc = NULL;
320 if (noexec)
321 break;
322 }
323
324 /*
325 * GrP Executing a command - run jobcmd hook
326 * Don't run for builtins
327 * Don't run if we're not in a tty
328 * Don't run if we're not really executing
329 */
330 /*
331 * CR - Charles Ross Aug 2005
332 * added "isoutatty".
333 * The new behavior is that the jobcmd won't be executed
334 * if stdout (SHOUT) isnt attached to a tty.. IE when
335 * redirecting, or using backquotes etc..
336 */
337 if (t->t_dtyp == NODE_COMMAND && !bifunc && !noexec && intty && isoutatty) {
338 Char *cmd = unparse(t);
339
340 cleanup_push(cmd, xfree);
341 job_cmd(cmd);
342 cleanup_until(cmd);
343 }
344
345 /*
346 * We fork only if we are timed, or are not the end of a parenthesized
347 * list and not a simple builtin function. Simple meaning one that is
348 * not pipedout, niced, nohupped, or &'d. It would be nice(?) to not
349 * fork in some of these cases.
350 */
351 #ifdef BACKPIPE
352 /*
353 * Can't have NOFORK for the tail of a pipe - because it is not the
354 * last command spawned (even if it is at the end of a parenthesised
355 * list).
356 */
357 if (t->t_dflg & F_PIPEIN)
358 t->t_dflg &= ~(F_NOFORK);
359 #else
360 /*
361 * "command | builtin" may cause major misbehaviour as noted in
362 * in the BUGS file entry
363 * Subject: Redirected input to built-in functions misbehaves badly
364 * forking when the builtin is the end of the pipe corrects the
365 * problem.
366 */
367 if (bifunc && (t->t_dflg & F_PIPEIN))
368 t->t_dflg &= ~(F_NOFORK);
369 #endif /* BACKPIPE */
370 /*
371 * Prevent forking cd, pushd, popd, chdir cause this will cause the
372 * shell not to change dir! (XXX: but only for nice?)
373 */
374 if (bifunc && (bifunc->bfunct == (bfunc_t)dochngd ||
375 bifunc->bfunct == (bfunc_t)dopushd ||
376 bifunc->bfunct == (bfunc_t)dopopd))
377 t->t_dflg &= ~(F_NICE);
378
379 if (((t->t_dflg & F_TIME) || ((t->t_dflg & F_NOFORK) == 0 &&
380 (!bifunc || t->t_dflg &
381 (F_PIPEOUT | F_AMPERSAND | F_NICE | F_NOHUP | F_HUP)))) ||
382 /*
383 * We have to fork for eval too.
384 */
385 (bifunc && (t->t_dflg & F_PIPEIN) != 0 &&
386 bifunc->bfunct == (bfunc_t)doeval)) {
387 #ifdef VFORK
388 if (t->t_dtyp == NODE_PAREN ||
389 t->t_dflg & (F_REPEAT | F_AMPERSAND) || bifunc)
390 #endif /* VFORK */
391 {
392 forked++;
393 /*
394 * We need to block SIGCHLD here, so that if the process does
395 * not die before we can set the process group
396 */
397 if (wanttty >= 0 && !nosigchld) {
398 sigemptyset(&set);
399 sigaddset(&set, SIGCHLD);
400 (void)sigprocmask(SIG_BLOCK, &set, &csigset);
401
402 nosigchld = 1;
403 }
404
405 pid = pfork(t, wanttty);
406 if (pid == 0 && nosigchld) {
407 sigprocmask(SIG_SETMASK, &csigset, NULL);
408 nosigchld = 0;
409 }
410 else if (pid != 0 && (t->t_dflg & F_AMPERSAND))
411 backpid = pid;
412 }
413
414 #ifdef VFORK
415 else {
416 int ochild, osetintr, ohaderr, odidfds;
417 int oSHIN, oSHOUT, oSHDIAG, oOLDSTD, otpgrp;
418 int oisoutatty, oisdiagatty;
419 sigset_t oset, ocsigset;
420 # ifndef CLOSE_ON_EXEC
421 int odidcch;
422 # endif /* !CLOSE_ON_EXEC */
423
424 /*
425 * Prepare for the vfork by saving everything that the child
426 * corrupts before it exec's. Note that in some signal
427 * implementations which keep the signal info in user space
428 * (e.g. Sun's) it will also be necessary to save and restore
429 * the current sigvec's for the signals the child touches
430 * before it exec's.
431 */
432
433 /*
434 * Sooooo true... If this is a Sun, save the sigvec's. (Skip
435 * Gilbrech - 11/22/87)
436 */
437 # ifdef SAVESIGVEC
438 struct sigaction savesv[NSIGSAVED];
439 sigset_t savesm;
440
441 # endif /* SAVESIGVEC */
442 if (wanttty >= 0 && !nosigchld && !noexec) {
443 sigemptyset(&set);
444 sigaddset(&set, SIGCHLD);
445 (void)sigprocmask(SIG_BLOCK, &set, &csigset);
446 nosigchld = 1;
447 }
448 sigemptyset(&set);
449 sigaddset(&set, SIGCHLD);
450 sigaddset(&set, SIGINT);
451 (void)sigprocmask(SIG_BLOCK, &set, &oset);
452 ochild = child;
453 osetintr = setintr;
454 ohaderr = haderr;
455 odidfds = didfds;
456 # ifndef CLOSE_ON_EXEC
457 odidcch = didcch;
458 # endif /* !CLOSE_ON_EXEC */
459 oSHIN = SHIN;
460 oSHOUT = SHOUT;
461 oSHDIAG = SHDIAG;
462 oOLDSTD = OLDSTD;
463 otpgrp = tpgrp;
464 oisoutatty = isoutatty;
465 oisdiagatty = isdiagatty;
466 ocsigset = csigset;
467 onosigchld = nosigchld;
468 Vsav = Vdp = 0;
469 Vexpath = 0;
470 Vt = 0;
471 # ifdef SAVESIGVEC
472 savesigvec(savesv, savesm);
473 # endif /* SAVESIGVEC */
474 if (use_fork)
475 pid = fork();
476 else
477 pid = vfork();
478
479 if (pid < 0) {
480 # ifdef SAVESIGVEC
481 restoresigvec(savesv, savesm);
482 # endif /* SAVESIGVEC */
483 sigprocmask(SIG_SETMASK, &oset, NULL);
484 stderror(ERR_NOPROC);
485 }
486 forked++;
487 if (pid) { /* parent */
488 # ifdef SAVESIGVEC
489 restoresigvec(savesv, savesm);
490 # endif /* SAVESIGVEC */
491 child = ochild;
492 setintr = osetintr;
493 haderr = ohaderr;
494 didfds = odidfds;
495 SHIN = oSHIN;
496 # ifndef CLOSE_ON_EXEC
497 didcch = odidcch;
498 # endif /* !CLOSE_ON_EXEC */
499 SHOUT = oSHOUT;
500 SHDIAG = oSHDIAG;
501 OLDSTD = oOLDSTD;
502 tpgrp = otpgrp;
503 isoutatty = oisoutatty;
504 isdiagatty = oisdiagatty;
505 csigset = ocsigset;
506 nosigchld = onosigchld;
507
508 xfree(Vsav);
509 Vsav = 0;
510 xfree(Vdp);
511 Vdp = 0;
512 xfree(Vexpath);
513 Vexpath = 0;
514 blk_cleanup(Vt);
515 Vt = 0;
516 /* this is from pfork() */
517 palloc(pid, t);
518 sigprocmask(SIG_SETMASK, &oset, NULL);
519 }
520 else { /* child */
521 /* this is from pfork() */
522 pid_t pgrp;
523 int ignint = 0;
524 if (nosigchld) {
525 sigprocmask(SIG_SETMASK, &csigset, NULL);
526 nosigchld = 0;
527 }
528
529 if (setintr)
530 ignint = (tpgrp == -1 && (t->t_dflg & F_NOINTERRUPT))
531 || (gointr && eq(gointr, STRminus));
532 pgrp = pcurrjob ? pcurrjob->p_jobid : getpid();
533 child++;
534 if (setintr) {
535 setintr = 0;
536 /*
537 * casts made right for SunOS 4.0 by Douglas C. Schmidt
538 * <schmidt%sunshine.ics.uci.edu@ROME.ICS.UCI.EDU>
539 * (thanks! -- PWP)
540 *
541 * ignint ifs cleaned by Johan Widen <mcvax!osiris.sics.se!jw@uunet.UU.NET>
542 * (thanks again)
543 */
544 if (ignint) {
545 (void) signal(SIGINT, SIG_IGN);
546 (void) signal(SIGQUIT, SIG_IGN);
547 }
548 else {
549 (void) signal(SIGINT, vffree);
550 (void) signal(SIGQUIT, SIG_DFL);
551 }
552 # ifdef BSDJOBS
553 if (wanttty >= 0) {
554 (void) signal(SIGTSTP, SIG_DFL);
555 (void) signal(SIGTTIN, SIG_DFL);
556 (void) signal(SIGTTOU, SIG_DFL);
557 }
558 # endif /* BSDJOBS */
559
560 sigaction(SIGTERM, &parterm, NULL);
561 }
562 else if (tpgrp == -1 &&
563 (t->t_dflg & F_NOINTERRUPT)) {
564 (void) signal(SIGINT, SIG_IGN);
565 (void) signal(SIGQUIT, SIG_IGN);
566 }
567
568 pgetty(wanttty, pgrp);
569
570 if (t->t_dflg & F_NOHUP)
571 (void) signal(SIGHUP, SIG_IGN);
572 if (t->t_dflg & F_HUP)
573 (void) signal(SIGHUP, SIG_DFL);
574 if (t->t_dflg & F_NICE) {
575 int nval = SIGN_EXTEND_CHAR(t->t_nice);
576 # if defined(HAVE_SETPRIORITY) && defined(PRIO_PROCESS)
577 if (setpriority(PRIO_PROCESS, 0, nval) == -1 && errno)
578 stderror(ERR_SYSTEM, "setpriority",
579 strerror(errno));
580 # else /* !HAVE_SETPRIORITY || !PRIO_PROCESS */
581 (void) nice(nval);
582 # endif /* HAVE_SETPRIORITY && PRIO_PROCESS */
583 }
584 # ifdef F_VER
585 if (t->t_dflg & F_VER) {
586 tsetenv(STRSYSTYPE, t->t_systype ? STRbsd43 : STRsys53);
587 dohash(NULL, NULL);
588 }
589 # endif /* F_VER */
590 }
591
592 }
593 #endif /* VFORK */
594 }
595 if (pid != 0) {
596 /*
597 * It would be better if we could wait for the whole job when we
598 * knew the last process had been started. Pwait, in fact, does
599 * wait for the whole job anyway, but this test doesn't really
600 * express our intentions.
601 */
602 #ifdef BACKPIPE
603 if (didfds == 0 && t->t_dflg & F_PIPEOUT) {
604 xclose(pipeout[0]);
605 xclose(pipeout[1]);
606 }
607 if ((t->t_dflg & F_PIPEIN) != 0)
608 break;
609 #else /* !BACKPIPE */
610 if (didfds == 0 && t->t_dflg & F_PIPEIN) {
611 xclose(pipein[0]);
612 xclose(pipein[1]);
613 }
614 if ((t->t_dflg & F_PIPEOUT) != 0)
615 break;
616 #endif /* BACKPIPE */
617
618 if (nosigchld) {
619 sigprocmask(SIG_SETMASK, &csigset, NULL);
620 nosigchld = 0;
621 }
622 if ((t->t_dflg & F_AMPERSAND) == 0)
623 pwait();
624 break;
625 }
626
627 doio(t, pipein, pipeout);
628 #ifdef BACKPIPE
629 if (t->t_dflg & F_PIPEIN) {
630 xclose(pipein[0]);
631 xclose(pipein[1]);
632 }
633 #else /* !BACKPIPE */
634 if (t->t_dflg & F_PIPEOUT) {
635 xclose(pipeout[0]);
636 xclose(pipeout[1]);
637 }
638 #endif /* BACKPIPE */
639 /*
640 * Perform a builtin function. If we are not forked, arrange for
641 * possible stopping
642 */
643 if (bifunc) {
644 if (forked) {
645 func(t, bifunc);
646 exitstat();
647 } else {
648 jmp_buf_t oldexit;
649 int ohaderr = haderr;
650
651 getexit(oldexit);
652 if (setexit() == 0)
653 func(t, bifunc);
654 resexit(oldexit);
655 haderr = ohaderr;
656
657 if (adrof(STRprintexitvalue)) {
658 int rv = getstatus();
659 if (rv != 0)
660 xprintf(CGETS(17, 2, "Exit %d\n"), rv);
661 }
662 }
663 break;
664 }
665 if (t->t_dtyp != NODE_PAREN) {
666 doexec(t, do_glob);
667 /* NOTREACHED */
668 }
669 /*
670 * For () commands must put new 0,1,2 in FSH* and recurse
671 */
672 if ((OLDSTD = dcopy(0, FOLDSTD)) >= 0)
673 (void)close_on_exec(OLDSTD, 1);
674 if ((SHOUT = dcopy(1, FSHOUT)) >= 0) {
675 (void)close_on_exec(SHOUT, 1);
676 isoutatty = isatty(SHOUT);
677 }
678 if ((SHDIAG = dcopy(2, FSHDIAG)) >= 0) {
679 (void)close_on_exec(SHDIAG, 1);
680 isdiagatty = isatty(SHDIAG);
681 }
682 xclose(SHIN);
683 SHIN = -1;
684 #ifndef CLOSE_ON_EXEC
685 didcch = 0;
686 #else
687 (void) close_on_exec(FSHOUT, 1);
688 (void) close_on_exec(FSHDIAG, 1);
689 (void) close_on_exec(FOLDSTD, 1);
690 #endif /* !CLOSE_ON_EXEC */
691 didfds = 0;
692 wanttty = -1;
693 t->t_dspr->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
694 execute(t->t_dspr, wanttty, NULL, NULL, do_glob);
695 exitstat();
696
697 case NODE_PIPE:
698 #ifdef BACKPIPE
699 t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
700 (F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT | F_BACKQ));
701 execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
702 t->t_dcar->t_dflg |= F_PIPEOUT | (t->t_dflg &
703 (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT | F_BACKQ));
704 execute(t->t_dcar, wanttty, pipein, pv, do_glob);
705 #else /* !BACKPIPE */
706 t->t_dcar->t_dflg |= F_PIPEOUT | (t->t_dflg &
707 (F_PIPEIN | F_AMPERSAND | F_STDERR | F_NOINTERRUPT | F_BACKQ));
708 execute(t->t_dcar, wanttty, pipein, pv, do_glob);
709 t->t_dcdr->t_dflg |= F_PIPEIN | (t->t_dflg &
710 (F_PIPEOUT | F_AMPERSAND | F_NOFORK | F_NOINTERRUPT | F_BACKQ));
711 execute(t->t_dcdr, wanttty, pv, pipeout, do_glob);
712 #endif /* BACKPIPE */
713 break;
714
715 case NODE_LIST:
716 if (t->t_dcar) {
717 t->t_dcar->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
718 execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
719 /*
720 * In strange case of A&B make a new job after A
721 */
722 if (t->t_dcar->t_dflg & F_AMPERSAND && t->t_dcdr &&
723 (t->t_dcdr->t_dflg & F_AMPERSAND) == 0)
724 pendjob();
725 }
726 if (t->t_dcdr) {
727 t->t_dcdr->t_dflg |= t->t_dflg &
728 (F_NOFORK | F_NOINTERRUPT | F_BACKQ);
729 execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
730 }
731 break;
732
733 case NODE_OR:
734 case NODE_AND:
735 if (t->t_dcar) {
736 t->t_dcar->t_dflg |= t->t_dflg & (F_NOINTERRUPT | F_BACKQ);
737 execute(t->t_dcar, wanttty, NULL, NULL, do_glob);
738 if ((getstatus() == 0) != (t->t_dtyp == NODE_AND)) {
739 return;
740 }
741 }
742 if (t->t_dcdr) {
743 t->t_dcdr->t_dflg |= t->t_dflg &
744 (F_NOFORK | F_NOINTERRUPT | F_BACKQ);
745 execute(t->t_dcdr, wanttty, NULL, NULL, do_glob);
746 }
747 break;
748
749 default:
750 break;
751 }
752 /*
753 * Fall through for all breaks from switch
754 *
755 * If there will be no more executions of this command, flush all file
756 * descriptors. Places that turn on the F_REPEAT bit are responsible for
757 * doing donefds after the last re-execution
758 */
759 if (didfds && !(t->t_dflg & F_REPEAT))
760 donefds();
761 }
762
763 #ifdef VFORK
764 static void
765 /*ARGSUSED*/
vffree(int snum)766 vffree(int snum)
767 {
768 USE(snum);
769
770 _exit(1);
771 }
772 #endif /* VFORK */
773
774 /*
775 * Expand and glob the words after an i/o redirection.
776 * If more than one word is generated, then update the command vector.
777 *
778 * This is done differently in all the shells:
779 * 1. in the bourne shell and ksh globbing is not performed
780 * 2. Bash/csh say ambiguous
781 * 3. zsh does i/o to/from all the files
782 * 4. itcsh concatenates the words.
783 *
784 * I don't know what is best to do. I think that Ambiguous is better
785 * than restructuring the command vector, because the user can get
786 * unexpected results. In any case, the command vector restructuring
787 * code is present and the user can choose it by setting noambiguous
788 */
789 static Char *
splicepipe(struct command * t,Char * cp)790 splicepipe(struct command *t, Char *cp)
791 {
792 Char *blk[2];
793
794 if (adrof(STRnoambiguous)) {
795 Char **pv;
796 int gflag;
797
798 blk[0] = Dfix1(cp); /* expand $ */
799 blk[1] = NULL;
800
801 gflag = tglob(blk);
802 if (gflag) {
803 pv = globall(blk, gflag);
804 if (pv == NULL) {
805 setname(short2str(blk[0]));
806 xfree(blk[0]);
807 stderror(ERR_NAME | ERR_NOMATCH);
808 }
809 if (pv[1] != NULL) { /* we need to fix the command vector */
810 Char **av = blkspl(t->t_dcom, &pv[1]);
811 xfree(t->t_dcom);
812 t->t_dcom = av;
813 }
814 xfree(blk[0]);
815 blk[0] = pv[0];
816 xfree(pv);
817 }
818 }
819 else {
820 Char *buf;
821
822 buf = Dfix1(cp);
823 cleanup_push(buf, xfree);
824 blk[0] = globone(buf, G_ERROR);
825 cleanup_until(buf);
826 }
827 return(blk[0]);
828 }
829
830 /*
831 * Perform io redirection.
832 * We may or maynot be forked here.
833 */
834 static void
doio(struct command * t,int * pipein,int * pipeout)835 doio(struct command *t, int *pipein, int *pipeout)
836 {
837 int fd;
838 Char *cp;
839 unsigned long flags = t->t_dflg;
840
841 if (didfds || (flags & F_REPEAT))
842 return;
843 if ((flags & F_READ) == 0) {/* F_READ already done */
844 if (t->t_dlef) {
845 char *tmp;
846
847 /*
848 * so < /dev/std{in,out,err} work
849 */
850 (void) dcopy(SHIN, 0);
851 (void) dcopy(SHOUT, 1);
852 (void) dcopy(SHDIAG, 2);
853 cp = splicepipe(t, t->t_dlef);
854 tmp = strsave(short2str(cp));
855 xfree(cp);
856 cleanup_push(tmp, xfree);
857 if ((fd = xopen(tmp, O_RDONLY|O_LARGEFILE)) < 0)
858 stderror(ERR_SYSTEM, tmp, strerror(errno));
859 cleanup_until(tmp);
860 /* allow input files larger than 2Gb */
861 #ifndef WINNT_NATIVE
862 (void) fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_LARGEFILE);
863 #endif /*!WINNT_NATIVE*/
864 (void) dmove(fd, 0);
865 }
866 else if (flags & F_PIPEIN) {
867 xclose(0);
868 TCSH_IGNORE(dup(pipein[0]));
869 xclose(pipein[0]);
870 xclose(pipein[1]);
871 }
872 else if ((flags & F_NOINTERRUPT) && tpgrp == -1) {
873 xclose(0);
874 (void) xopen(_PATH_DEVNULL, O_RDONLY|O_LARGEFILE);
875 }
876 else {
877 xclose(0);
878 TCSH_IGNORE(dup(OLDSTD));
879 #if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
880 /*
881 * PWP: Unlike Bezerkeley 4.3, FIONCLEX for Pyramid is preserved
882 * across dup()s, so we have to UNSET it here or else we get a
883 * command with NO stdin, stdout, or stderr at all (a bad thing
884 * indeed)
885 */
886 (void) close_on_exec(0, 0);
887 #endif /* CLOSE_ON_EXEC && CLEX_DUPS */
888 }
889 }
890 if (t->t_drit) {
891 char *tmp;
892
893 cp = splicepipe(t, t->t_drit);
894 tmp = strsave(short2str(cp));
895 xfree(cp);
896 cleanup_push(tmp, xfree);
897 /*
898 * so > /dev/std{out,err} work
899 */
900 (void) dcopy(SHOUT, 1);
901 (void) dcopy(SHDIAG, 2);
902 if ((flags & F_APPEND) != 0) {
903 #ifdef O_APPEND
904 fd = xopen(tmp, O_WRONLY|O_APPEND|O_LARGEFILE);
905 #else /* !O_APPEND */
906 fd = xopen(tmp, O_WRONLY|O_LARGEFILE);
907 (void) lseek(fd, (off_t) 0, L_XTND);
908 #endif /* O_APPEND */
909 }
910 else
911 fd = 0;
912 if ((flags & F_APPEND) == 0 || fd == -1) {
913 if (!(flags & F_OVERWRITE) && no_clobber) {
914 if (flags & F_APPEND)
915 stderror(ERR_SYSTEM, tmp, strerror(errno));
916 chkclob(tmp);
917 }
918 if ((fd = xcreat(tmp, 0666)) < 0)
919 stderror(ERR_SYSTEM, tmp, strerror(errno));
920 /* allow input files larger than 2Gb */
921 #ifndef WINNT_NATIVE
922 (void) fcntl(fd, F_SETFL, fcntl(fd, F_GETFL) | O_LARGEFILE);
923 #endif /*!WINNT_NATIVE*/
924 }
925 cleanup_until(tmp);
926 (void) dmove(fd, 1);
927 is1atty = isatty(1);
928 }
929 else if (flags & F_PIPEOUT) {
930 xclose(1);
931 TCSH_IGNORE(dup(pipeout[1]));
932 is1atty = 0;
933 }
934 else {
935 xclose(1);
936 TCSH_IGNORE(dup(SHOUT));
937 is1atty = isoutatty;
938 # if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
939 (void) close_on_exec(1, 0);
940 # endif /* CLOSE_ON_EXEC && CLEX_DUPS */
941 }
942
943 xclose(2);
944 if (flags & F_STDERR) {
945 TCSH_IGNORE(dup(1));
946 is2atty = is1atty;
947 }
948 else {
949 TCSH_IGNORE(dup(SHDIAG));
950 is2atty = isdiagatty;
951 # if defined(CLOSE_ON_EXEC) && defined(CLEX_DUPS)
952 (void) close_on_exec(2, 0);
953 # endif /* CLOSE_ON_EXEC && CLEX_DUPS */
954 }
955 didfds = 1;
956 }
957
958 void
mypipe(int * pv)959 mypipe(int *pv)
960 {
961
962 if (pipe(pv) < 0)
963 goto oops;
964 (void)close_on_exec(pv[0] = dmove(pv[0], -1), 1);
965 (void)close_on_exec(pv[1] = dmove(pv[1], -1), 1);
966 if (pv[0] >= 0 && pv[1] >= 0)
967 return;
968 if (pv[0] >= 0)
969 xclose(pv[0]);
970 if (pv[1] >= 0)
971 xclose(pv[1]);
972 oops:
973 stderror(ERR_PIPE);
974 }
975
976 static void
chkclob(const char * cp)977 chkclob(const char *cp)
978 {
979 struct stat stb;
980
981 if (stat(cp, &stb) < 0)
982 return;
983 if (S_ISCHR(stb.st_mode))
984 return;
985 if (no_clobber & NOCLOBBER_NOTEMPTY && stb.st_size == 0)
986 return;
987 if (no_clobber & NOCLOBBER_ASK) {
988 if (getYN(CGETS(22, 15,
989 "Do you really want to overwrite an existing file? [N/y] ")))
990 return;
991 }
992
993 stderror(ERR_EXISTS, cp);
994 }
995