source: trunk/ash/exec.c@ 3271

Last change on this file since 3271 was 3271, checked in by bird, 18 years ago

translate /bin/sh and a few other standard things to /@unixroot and PATH searches.

File size: 28.6 KB
RevLine 
[2460]1/* $NetBSD: exec.c,v 1.37 2003/08/07 09:05:31 agc Exp $ */
2
3/*-
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Kenneth Almquist.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36#ifndef lint
37#if 0
38static char sccsid[] = "@(#)exec.c 8.4 (Berkeley) 6/8/95";
39#else
40__RCSID("$NetBSD: exec.c,v 1.37 2003/08/07 09:05:31 agc Exp $");
41#endif
42#endif /* not lint */
43
44#include <sys/types.h>
45#include <sys/stat.h>
46#include <sys/wait.h>
47#include <unistd.h>
48#include <fcntl.h>
49#include <errno.h>
50#include <stdio.h>
51#include <stdlib.h>
52
53/*
54 * When commands are first encountered, they are entered in a hash table.
55 * This ensures that a full path search will not have to be done for them
56 * on each invocation.
57 *
58 * We should investigate converting to a linear search, even though that
59 * would make the command name "hash" a misnomer.
60 */
61
62#include "shell.h"
63#include "main.h"
64#include "nodes.h"
65#include "parser.h"
66#include "redir.h"
67#include "eval.h"
68#include "exec.h"
69#include "builtins.h"
70#include "var.h"
71#include "options.h"
72#include "input.h"
73#include "output.h"
74#include "syntax.h"
75#include "memalloc.h"
76#include "error.h"
77#include "init.h"
78#include "mystring.h"
79#include "show.h"
80#include "jobs.h"
81#include "alias.h"
[2463]82#ifdef __INNOTEK_LIBC__
83#include <InnoTekLIBC/backend.h>
84#endif
[2460]85
86
87#define CMDTABLESIZE 31 /* should be prime */
88#define ARB 1 /* actual size determined at run time */
89
90
91
92struct tblentry {
93 struct tblentry *next; /* next entry in hash chain */
94 union param param; /* definition of builtin function */
95 short cmdtype; /* index identifying command */
96 char rehash; /* if set, cd done since entry created */
97 char cmdname[ARB]; /* name of command */
98};
99
100
101STATIC struct tblentry *cmdtable[CMDTABLESIZE];
102STATIC int builtinloc = -1; /* index in path of %builtin, or -1 */
103int exerrno = 0; /* Last exec error */
104
105
[2463]106STATIC void tryexec(char *, char **, char **, int, int);
[2460]107STATIC void execinterp(char **, char **);
108STATIC void printentry(struct tblentry *, int);
109STATIC void clearcmdentry(int);
110STATIC struct tblentry *cmdlookup(const char *, int);
111STATIC void delete_cmd_entry(void);
[2463]112#ifdef PC_EXE_EXTS
113STATIC int stat_pc_exec_exts(char *fullname, struct stat *st, int has_ext);
114#endif
[2460]115
116
117extern char *const parsekwd[];
118
119/*
120 * Exec a program. Never returns. If you change this routine, you may
121 * have to change the find_command routine as well.
122 */
123
124void
125shellexec(char **argv, char **envp, const char *path, int idx, int vforked)
126{
127 char *cmdname;
128 int e;
[2463]129#ifdef PC_EXE_EXTS
130 int has_ext = strlen(argv[0]) - 4;
131 has_ext = has_ext > 0
132 && argv[0][has_ext] == '.'
133 /* use strstr and upper/lower permuated extensions to avoid multiple strcasecmp calls. */
134 && strstr("exe;" "Exe;" "EXe;" "EXE;" "ExE;" "eXe;" "eXE;" "exE;"
135 "cmd;" "Cmd;" "CMd;" "CMD;" "CmD;" "cMd;" "cMD;" "cmD;"
136 "com;" "Com;" "COm;" "COM;" "CoM;" "cOm;" "cOM;" "coM;"
137 "bat;" "Bat;" "BAt;" "BAT;" "BaT;" "bAt;" "bAT;" "baT;"
138 "btm;" "Btm;" "BTm;" "BTM;" "BtM;" "bTm;" "bTM;" "btM;",
139 argv[0] + has_ext + 1)
140 != NULL;
141#else
142 const int has_ext = 1;
143#endif
144 TRACE(("shellexec: argv[0]=%s idx=%d\n", argv[0], idx));
[2460]145 if (strchr(argv[0], '/') != NULL) {
[2463]146 cmdname = stalloc(strlen(argv[0]) + 5);
147 strcpy(cmdname, argv[0]);
148 tryexec(cmdname, argv, envp, vforked, has_ext);
149 TRACE(("shellexec: cmdname=%s\n", cmdname));
150 stunalloc(cmdname);
[2460]151 e = errno;
152 } else {
153 e = ENOENT;
154 while ((cmdname = padvance(&path, argv[0])) != NULL) {
155 if (--idx < 0 && pathopt == NULL) {
[2463]156 tryexec(cmdname, argv, envp, vforked, has_ext);
[2460]157 if (errno != ENOENT && errno != ENOTDIR)
158 e = errno;
159 }
160 stunalloc(cmdname);
161 }
162 }
163
164 /* Map to POSIX errors */
165 switch (e) {
166 case EACCES:
167 exerrno = 126;
168 break;
169 case ENOENT:
170 exerrno = 127;
171 break;
172 default:
173 exerrno = 2;
174 break;
175 }
[2463]176 TRACE(("shellexec failed for '%s', errno %d, vforked %d, suppressint %d\n",
[2460]177 argv[0], e, vforked, suppressint ));
178 exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
179 /* NOTREACHED */
180}
181
182
183STATIC void
[2463]184tryexec(char *cmd, char **argv, char **envp, int vforked, int has_ext)
[2460]185{
186 int e;
[2463]187#ifdef EXEC_HASH_BANG_SCRIPT
[2460]188 char *p;
189#endif
[2463]190#ifdef PC_EXE_EXTS
191 /* exploit the effect of stat_pc_exec_exts which adds the
192 * correct extentions to the file.
193 */
194 struct stat st;
195 if (!has_ext)
196 stat_pc_exec_exts(cmd, &st, 0);
197#endif
198#if defined __INNOTEK_LIBC__ && defined EXEC_HASH_BANG_SCRIPT
199 __libc_Back_gfProcessHandleHashBangScripts = 0;
200#endif
[2460]201
202#ifdef SYSV
203 do {
204 execve(cmd, argv, envp);
205 } while (errno == EINTR);
206#else
207 execve(cmd, argv, envp);
208#endif
209 e = errno;
210 if (e == ENOEXEC) {
211 if (vforked) {
212 /* We are currently vfork(2)ed, so raise an
213 * exception, and evalcommand will try again
214 * with a normal fork(2).
215 */
216 exraise(EXSHELLPROC);
217 }
218 initshellproc();
219 setinputfile(cmd, 0);
220 commandname = arg0 = savestr(argv[0]);
[2463]221#ifdef EXEC_HASH_BANG_SCRIPT
[2460]222 pgetc(); pungetc(); /* fill up input buffer */
223 p = parsenextc;
224 if (parsenleft > 2 && p[0] == '#' && p[1] == '!') {
225 argv[0] = cmd;
226 execinterp(argv, envp);
227 }
228#endif
229 setparam(argv + 1);
230 exraise(EXSHELLPROC);
231 }
[3271]232#ifdef __OS2__
233 /* A lot of scripts references some core /bin/ programs, like for
234 instance the bash testcases. So, to make life easier, we map
235 a small set of these to @unixroot and or the PATH to simplify
236 porting. */
237 else if (!strncmp(cmd, "/bin/", sizeof("/bin/") - 1)) {
238 char *name = cmd+ sizeof("/bin/") - 1;
239 int search_path = 1;
240 if (!strcmp(name, "sh")
241 || !strcmp(name, "sh.exe")
242 || !strcmp(name, "bash")
243 || !strcmp(name, "bash.exe")
244 || !strcmp(name, "ash")
245 || !strcmp(name, "ash.exe")
246 || !strcmp(name, "ls")
247 || !strcmp(name, "ls.exe")
248 || !strcmp(name, "cat")
249 || !strcmp(name, "cat.exe")
250 || !strcmp(name, "mkdir")
251 || !strcmp(name, "mkdir.exe")
252 || !strcmp(name, "expr")
253 || !strcmp(name, "expr.exe")
254 || !strcmp(name, "pwd")
255 || !strcmp(name, "pwd.exe")
256 || !strcmp(name, "tr")
257 || !strcmp(name, "tr.exe")
258 || (search_path = 0)
259 || !strcmp(name, "sort")
260 || !strcmp(name, "sort.exe")
261 || !strcmp(name, "cp")
262 || !strcmp(name, "cp.exe")
263 || !strcmp(name, "rm")
264 || !strcmp(name, "rm.exe")
265 || !strcmp(name, "unlink")
266 || !strcmp(name, "unlink.exe")
267 || !strcmp(name, "mv")
268 || !strcmp(name, "mv.exe")
269 || !strcmp(name, "rmdir")
270 || !strcmp(name, "rmdir.exe")
271 ) {
272 char tmp[48];
273 strcat(strcpy(tmp, "/@unixroot"), cmd);
274 execve(tmp, argv, envp);
275 if (search_path) {
276 strcpy(tmp, name);
277 if (!strchr(name, '.'))
278 strcat(tmp, ".exe");
279 execvpe(tmp, argv, envp);
280 }
281 }
282 }
283#endif
[2460]284 errno = e;
285}
286
287
[2463]288#ifdef EXEC_HASH_BANG_SCRIPT
[2460]289/*
290 * Execute an interpreter introduced by "#!", for systems where this
291 * feature has not been built into the kernel. If the interpreter is
292 * the shell, return (effectively ignoring the "#!"). If the execution
293 * of the interpreter fails, exit.
294 *
295 * This code peeks inside the input buffer in order to avoid actually
296 * reading any input. It would benefit from a rewrite.
297 */
298
299#define NEWARGS 5
300
301STATIC void
302execinterp(char **argv, char **envp)
303{
304 int n;
305 char *inp;
306 char *outp;
307 char c;
308 char *p;
309 char **ap;
310 char *newargs[NEWARGS];
311 int i;
312 char **ap2;
313 char **new;
314
315 n = parsenleft - 2;
316 inp = parsenextc + 2;
317 ap = newargs;
318 for (;;) {
319 while (--n >= 0 && (*inp == ' ' || *inp == '\t'))
320 inp++;
321 if (n < 0)
322 goto bad;
323 if ((c = *inp++) == '\n')
324 break;
325 if (ap == &newargs[NEWARGS])
326bad: error("Bad #! line");
327 STARTSTACKSTR(outp);
328 do {
329 STPUTC(c, outp);
330 } while (--n >= 0 && (c = *inp++) != ' ' && c != '\t' && c != '\n');
331 STPUTC('\0', outp);
332 n++, inp--;
333 *ap++ = grabstackstr(outp);
334 }
335 if (ap == newargs + 1) { /* if no args, maybe no exec is needed */
336 p = newargs[0];
337 for (;;) {
338 if (equal(p, "sh") || equal(p, "ash")) {
[2463]339 TRACE(("hash bang self\n"));
[2460]340 return;
341 }
342 while (*p != '/') {
343 if (*p == '\0')
344 goto break2;
345 p++;
346 }
347 p++;
348 }
349break2:;
350 }
351 i = (char *)ap - (char *)newargs; /* size in bytes */
352 if (i == 0)
353 error("Bad #! line");
354 for (ap2 = argv ; *ap2++ != NULL ; );
355 new = ckmalloc(i + ((char *)ap2 - (char *)argv));
356 ap = newargs, ap2 = new;
357 while ((i -= sizeof (char **)) >= 0)
358 *ap2++ = *ap++;
359 ap = argv;
360 while (*ap2++ = *ap++);
[2463]361 TRACE(("hash bang '%s'\n", new[0]));
362 shellexec(new, envp, pathval(), 0, 0);
[2460]363 /* NOTREACHED */
364}
365#endif
366
367
368
369/*
370 * Do a path search. The variable path (passed by reference) should be
371 * set to the start of the path before the first call; padvance will update
372 * this value as it proceeds. Successive calls to padvance will return
373 * the possible path expansions in sequence. If an option (indicated by
374 * a percent sign) appears in the path entry then the global variable
375 * pathopt will be set to point to it; otherwise pathopt will be set to
376 * NULL.
377 */
378
379const char *pathopt;
380
381char *
382padvance(const char **path, const char *name)
383{
384 const char *p;
385 char *q;
[3229]386#ifdef PC_SLASHES
[3164]387 char *s;
388#endif
[2460]389 const char *start;
390 int len;
391
392 if (*path == NULL)
393 return NULL;
394 start = *path;
[2463]395#ifdef PC_PATH_SEP
396 for (p = start ; *p && *p != ';' && *p != '%' ; p++);
397#else
[2460]398 for (p = start ; *p && *p != ':' && *p != '%' ; p++);
[2463]399#endif
[2460]400 len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */
[2463]401#ifdef PC_EXE_EXTS
402 len += 4; /* "4" is for .exe/.com/.cmd/.bat/.btm */
403#endif
[2460]404 while (stackblocksize() < len)
405 growstackblock();
[3229]406#ifdef PC_SLASHES
[3164]407 s =
408#endif
[2460]409 q = stackblock();
410 if (p != start) {
411 memcpy(q, start, p - start);
412 q += p - start;
413 *q++ = '/';
414 }
415 strcpy(q, name);
[3229]416#ifdef PC_SLASHES
[3164]417 while ((s = strchr(s, '\\')) != NULL)
418 *s++ = '/';
419#endif
[2460]420 pathopt = NULL;
421 if (*p == '%') {
422 pathopt = ++p;
[2463]423#ifdef PC_PATH_SEP
424 while (*p && *p != ';') p++;
425#else
[2460]426 while (*p && *p != ':') p++;
[2463]427#endif
[2460]428 }
[2463]429#ifdef PC_PATH_SEP
430 if (*p == ';')
431#else
[2460]432 if (*p == ':')
[2463]433#endif
[2460]434 *path = p + 1;
435 else
436 *path = NULL;
437 return stalloc(len);
438}
439
440
[2463]441#ifdef PC_EXE_EXTS
442STATIC int stat_pc_exec_exts(char *fullname, struct stat *st, int has_ext)
443{
444 /* skip the SYSV crap */
445 if (stat(fullname, st) >= 0)
446 return 0;
447 if (!has_ext && errno == ENOENT)
448 {
449 char *psz = strchr(fullname, '\0');
450 memcpy(psz, ".exe", 5);
451 if (stat(fullname, st) >= 0)
452 return 0;
453 if (errno != ENOENT && errno != ENOTDIR)
454 return -1;
[2460]455
[2463]456 memcpy(psz, ".cmd", 5);
457 if (stat(fullname, st) >= 0)
458 return 0;
459 if (errno != ENOENT && errno != ENOTDIR)
460 return -1;
461
462 memcpy(psz, ".bat", 5);
463 if (stat(fullname, st) >= 0)
464 return 0;
465 if (errno != ENOENT && errno != ENOTDIR)
466 return -1;
467
468 memcpy(psz, ".com", 5);
469 if (stat(fullname, st) >= 0)
470 return 0;
471 if (errno != ENOENT && errno != ENOTDIR)
472 return -1;
473
474 memcpy(psz, ".btm", 5);
475 if (stat(fullname, st) >= 0)
476 return 0;
477 *psz = '\0';
478 }
479 return -1;
480}
481#endif /* PC_EXE_EXTS */
482
483
484
[2460]485/*** Command hashing code ***/
486
487
488int
489hashcmd(int argc, char **argv)
490{
491 struct tblentry **pp;
492 struct tblentry *cmdp;
493 int c;
494 int verbose;
495 struct cmdentry entry;
496 char *name;
497
498 verbose = 0;
499 while ((c = nextopt("rv")) != '\0') {
500 if (c == 'r') {
501 clearcmdentry(0);
502 } else if (c == 'v') {
503 verbose++;
504 }
505 }
506 if (*argptr == NULL) {
507 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
508 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
509 if (verbose || cmdp->cmdtype == CMDNORMAL)
510 printentry(cmdp, verbose);
511 }
512 }
513 return 0;
514 }
515 while ((name = *argptr) != NULL) {
516 if ((cmdp = cmdlookup(name, 0)) != NULL
517 && (cmdp->cmdtype == CMDNORMAL
518 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
519 delete_cmd_entry();
520 find_command(name, &entry, DO_ERR, pathval());
521 if (verbose) {
522 if (entry.cmdtype != CMDUNKNOWN) { /* if no error msg */
523 cmdp = cmdlookup(name, 0);
524 printentry(cmdp, verbose);
525 }
[2463]526 output_flushall();
[2460]527 }
528 argptr++;
529 }
530 return 0;
531}
532
533
534STATIC void
535printentry(struct tblentry *cmdp, int verbose)
536{
537 int idx;
538 const char *path;
539 char *name;
540
541 switch (cmdp->cmdtype) {
542 case CMDNORMAL:
543 idx = cmdp->param.index;
544 path = pathval();
545 do {
546 name = padvance(&path, cmdp->cmdname);
547 stunalloc(name);
548 } while (--idx >= 0);
549 out1str(name);
550 break;
551 case CMDSPLBLTIN:
552 out1fmt("special builtin %s", cmdp->cmdname);
553 break;
554 case CMDBUILTIN:
555 out1fmt("builtin %s", cmdp->cmdname);
556 break;
557 case CMDFUNCTION:
558 out1fmt("function %s", cmdp->cmdname);
559 if (verbose) {
560 struct procstat ps;
561 INTOFF;
562 commandtext(&ps, cmdp->param.func);
563 INTON;
564 out1str("() { ");
565 out1str(ps.cmd);
566 out1str("; }");
567 }
568 break;
569 default:
570 error("internal error: %s cmdtype %d", cmdp->cmdname, cmdp->cmdtype);
571 }
572 if (cmdp->rehash)
573 out1c('*');
574 out1c('\n');
575}
576
577
578
579/*
580 * Resolve a command name. If you change this routine, you may have to
581 * change the shellexec routine as well.
582 */
583
584void
585find_command(char *name, struct cmdentry *entry, int act, const char *path)
586{
587 struct tblentry *cmdp, loc_cmd;
588 int idx;
589 int prev;
590 char *fullname;
591 struct stat statb;
592 int e;
593 int (*bltin)(int,char **);
594
[2463]595#ifdef PC_EXE_EXTS
596 int has_ext = strlen(name) - 4;
597 has_ext = has_ext > 0
598 && name[has_ext] == '.'
599 /* use strstr and upper/lower permuated extensions to avoid multiple strcasecmp calls. */
600 && strstr("exe;" "Exe;" "EXe;" "EXE;" "ExE;" "eXe;" "eXE;" "exE;"
601 "cmd;" "Cmd;" "CMd;" "CMD;" "CmD;" "cMd;" "cMD;" "cmD;"
602 "com;" "Com;" "COm;" "COM;" "CoM;" "cOm;" "cOM;" "coM;"
603 "bat;" "Bat;" "BAt;" "BAT;" "BaT;" "bAt;" "bAT;" "baT;"
604 "btm;" "Btm;" "BTm;" "BTM;" "BtM;" "bTm;" "bTM;" "btM;",
605 name + has_ext + 1)
606 != NULL;
607#endif
608
[2460]609 /* If name contains a slash, don't use PATH or hash table */
610 if (strchr(name, '/') != NULL) {
611 if (act & DO_ABS) {
612 while (stat(name, &statb) < 0) {
613#ifdef SYSV
614 if (errno == EINTR)
615 continue;
616#endif
617 if (errno != ENOENT && errno != ENOTDIR)
618 e = errno;
619 entry->cmdtype = CMDUNKNOWN;
620 entry->u.index = -1;
621 return;
622 }
623 entry->cmdtype = CMDNORMAL;
624 entry->u.index = -1;
625 return;
626 }
627 entry->cmdtype = CMDNORMAL;
628 entry->u.index = 0;
629 return;
630 }
631
632 if (path != pathval())
633 act |= DO_ALTPATH;
634
635 if (act & DO_ALTPATH && strstr(path, "%builtin") != NULL)
636 act |= DO_ALTBLTIN;
637
638 /* If name is in the table, check answer will be ok */
639 if ((cmdp = cmdlookup(name, 0)) != NULL) {
640 do {
641 switch (cmdp->cmdtype) {
642 case CMDNORMAL:
643 if (act & DO_ALTPATH) {
644 cmdp = NULL;
645 continue;
646 }
647 break;
648 case CMDFUNCTION:
649 if (act & DO_NOFUNC) {
650 cmdp = NULL;
651 continue;
652 }
653 break;
654 case CMDBUILTIN:
655 if ((act & DO_ALTBLTIN) || builtinloc >= 0) {
656 cmdp = NULL;
657 continue;
658 }
659 break;
660 }
661 /* if not invalidated by cd, we're done */
662 if (cmdp->rehash == 0)
663 goto success;
664 } while (0);
665 }
666
667 /* If %builtin not in path, check for builtin next */
668 if ((act & DO_ALTPATH ? !(act & DO_ALTBLTIN) : builtinloc < 0) &&
669 (bltin = find_builtin(name)) != 0)
670 goto builtin_success;
671
672 /* We have to search path. */
673 prev = -1; /* where to start */
674 if (cmdp) { /* doing a rehash */
675 if (cmdp->cmdtype == CMDBUILTIN)
676 prev = builtinloc;
677 else
678 prev = cmdp->param.index;
679 }
680
681 e = ENOENT;
682 idx = -1;
683loop:
684 while ((fullname = padvance(&path, name)) != NULL) {
685 stunalloc(fullname);
686 idx++;
687 if (pathopt) {
688 if (prefix("builtin", pathopt)) {
689 if ((bltin = find_builtin(name)) == 0)
690 goto loop;
691 goto builtin_success;
692 } else if (prefix("func", pathopt)) {
693 /* handled below */
694 } else {
695 /* ignore unimplemented options */
696 goto loop;
697 }
698 }
699 /* if rehash, don't redo absolute path names */
700 if (fullname[0] == '/' && idx <= prev) {
701 if (idx < prev)
702 goto loop;
703 TRACE(("searchexec \"%s\": no change\n", name));
704 goto success;
705 }
[2463]706#ifdef PC_EXE_EXTS
707 while (stat_pc_exec_exts(fullname, &statb, has_ext) < 0) {
708#else
[2460]709 while (stat(fullname, &statb) < 0) {
[2463]710#endif
[2460]711#ifdef SYSV
712 if (errno == EINTR)
713 continue;
714#endif
715 if (errno != ENOENT && errno != ENOTDIR)
716 e = errno;
[2463]717
[2460]718 goto loop;
719 }
720 e = EACCES; /* if we fail, this will be the error */
721 if (!S_ISREG(statb.st_mode))
722 goto loop;
723 if (pathopt) { /* this is a %func directory */
724 if (act & DO_NOFUNC)
725 goto loop;
726 stalloc(strlen(fullname) + 1);
727 readcmdfile(fullname);
728 if ((cmdp = cmdlookup(name, 0)) == NULL ||
729 cmdp->cmdtype != CMDFUNCTION)
730 error("%s not defined in %s", name, fullname);
731 stunalloc(fullname);
732 goto success;
733 }
734#ifdef notdef
735 /* XXX this code stops root executing stuff, and is buggy
736 if you need a group from the group list. */
737 if (statb.st_uid == geteuid()) {
738 if ((statb.st_mode & 0100) == 0)
739 goto loop;
740 } else if (statb.st_gid == getegid()) {
741 if ((statb.st_mode & 010) == 0)
742 goto loop;
743 } else {
744 if ((statb.st_mode & 01) == 0)
745 goto loop;
746 }
747#endif
748 TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
749 INTOFF;
750 if (act & DO_ALTPATH) {
751 stalloc(strlen(fullname) + 1);
752 cmdp = &loc_cmd;
753 } else
754 cmdp = cmdlookup(name, 1);
755 cmdp->cmdtype = CMDNORMAL;
756 cmdp->param.index = idx;
757 INTON;
758 goto success;
759 }
760
761 /* We failed. If there was an entry for this command, delete it */
762 if (cmdp)
763 delete_cmd_entry();
764 if (act & DO_ERR)
765 outfmt(out2, "%s: %s\n", name, errmsg(e, E_EXEC));
766 entry->cmdtype = CMDUNKNOWN;
767 return;
768
769builtin_success:
770 INTOFF;
771 if (act & DO_ALTPATH)
772 cmdp = &loc_cmd;
773 else
774 cmdp = cmdlookup(name, 1);
775 if (cmdp->cmdtype == CMDFUNCTION)
776 /* DO_NOFUNC must have been set */
777 cmdp = &loc_cmd;
778 cmdp->cmdtype = CMDBUILTIN;
779 cmdp->param.bltin = bltin;
780 INTON;
781success:
782 cmdp->rehash = 0;
783 entry->cmdtype = cmdp->cmdtype;
784 entry->u = cmdp->param;
785}
786
787
788
789/*
790 * Search the table of builtin commands.
791 */
792
793int
794(*find_builtin(name))(int, char **)
795 char *name;
796{
797 const struct builtincmd *bp;
798
799 for (bp = builtincmd ; bp->name ; bp++) {
800 if (*bp->name == *name && equal(bp->name, name))
801 return bp->builtin;
802 }
803 return 0;
804}
805
806int
807(*find_splbltin(name))(int, char **)
808 char *name;
809{
810 const struct builtincmd *bp;
811
812 for (bp = splbltincmd ; bp->name ; bp++) {
813 if (*bp->name == *name && equal(bp->name, name))
814 return bp->builtin;
815 }
816 return 0;
817}
818
819/*
820 * At shell startup put special builtins into hash table.
821 * ensures they are executed first (see posix).
822 * We stop functions being added with the same name
823 * (as they are impossible to call)
824 */
825
826void
827hash_special_builtins(void)
828{
829 const struct builtincmd *bp;
830 struct tblentry *cmdp;
831
832 for (bp = splbltincmd ; bp->name ; bp++) {
833 cmdp = cmdlookup(bp->name, 1);
834 cmdp->cmdtype = CMDSPLBLTIN;
835 cmdp->param.bltin = bp->builtin;
836 }
837}
838
839
840
841/*
842 * Called when a cd is done. Marks all commands so the next time they
843 * are executed they will be rehashed.
844 */
845
846void
847hashcd(void)
848{
849 struct tblentry **pp;
850 struct tblentry *cmdp;
851
852 for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
853 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
854 if (cmdp->cmdtype == CMDNORMAL
855 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
856 cmdp->rehash = 1;
857 }
858 }
859}
860
861
862
863/*
864 * Fix command hash table when PATH changed.
865 * Called before PATH is changed. The argument is the new value of PATH;
866 * pathval() still returns the old value at this point.
867 * Called with interrupts off.
868 */
869
870void
871changepath(const char *newval)
872{
873 const char *old, *new;
874 int idx;
875 int firstchange;
876 int bltin;
877
878 old = pathval();
879 new = newval;
880 firstchange = 9999; /* assume no change */
881 idx = 0;
882 bltin = -1;
883 for (;;) {
884 if (*old != *new) {
885 firstchange = idx;
[2463]886#ifdef PC_PATH_SEP
887 if ((*old == '\0' && *new == ';')
888 || (*old == ';' && *new == '\0'))
889#else
[2460]890 if ((*old == '\0' && *new == ':')
891 || (*old == ':' && *new == '\0'))
[2463]892#endif
[2460]893 firstchange++;
894 old = new; /* ignore subsequent differences */
895 }
896 if (*new == '\0')
897 break;
898 if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
899 bltin = idx;
[2463]900#ifdef PC_PATH_SEP
901 if (*new == ';') {
902#else
[2460]903 if (*new == ':') {
[2463]904#endif
[2460]905 idx++;
906 }
907 new++, old++;
908 }
909 if (builtinloc < 0 && bltin >= 0)
910 builtinloc = bltin; /* zap builtins */
911 if (builtinloc >= 0 && bltin < 0)
912 firstchange = 0;
913 clearcmdentry(firstchange);
914 builtinloc = bltin;
915}
916
917
918/*
919 * Clear out command entries. The argument specifies the first entry in
920 * PATH which has changed.
921 */
922
923STATIC void
924clearcmdentry(int firstchange)
925{
926 struct tblentry **tblp;
927 struct tblentry **pp;
928 struct tblentry *cmdp;
929
930 INTOFF;
931 for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
932 pp = tblp;
933 while ((cmdp = *pp) != NULL) {
934 if ((cmdp->cmdtype == CMDNORMAL &&
935 cmdp->param.index >= firstchange)
936 || (cmdp->cmdtype == CMDBUILTIN &&
937 builtinloc >= firstchange)) {
938 *pp = cmdp->next;
939 ckfree(cmdp);
940 } else {
941 pp = &cmdp->next;
942 }
943 }
944 }
945 INTON;
946}
947
948
949/*
950 * Delete all functions.
951 */
952
953#ifdef mkinit
954MKINIT void deletefuncs(void);
955MKINIT void hash_special_builtins(void);
956
957INIT {
958 hash_special_builtins();
959}
960
961SHELLPROC {
962 deletefuncs();
963}
964#endif
965
966void
967deletefuncs(void)
968{
969 struct tblentry **tblp;
970 struct tblentry **pp;
971 struct tblentry *cmdp;
972
973 INTOFF;
974 for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
975 pp = tblp;
976 while ((cmdp = *pp) != NULL) {
977 if (cmdp->cmdtype == CMDFUNCTION) {
978 *pp = cmdp->next;
979 freefunc(cmdp->param.func);
980 ckfree(cmdp);
981 } else {
982 pp = &cmdp->next;
983 }
984 }
985 }
986 INTON;
987}
988
989
990
991/*
992 * Locate a command in the command hash table. If "add" is nonzero,
993 * add the command to the table if it is not already present. The
994 * variable "lastcmdentry" is set to point to the address of the link
995 * pointing to the entry, so that delete_cmd_entry can delete the
996 * entry.
997 */
998
999struct tblentry **lastcmdentry;
1000
1001
1002STATIC struct tblentry *
1003cmdlookup(const char *name, int add)
1004{
1005 int hashval;
1006 const char *p;
1007 struct tblentry *cmdp;
1008 struct tblentry **pp;
1009
1010 p = name;
1011 hashval = *p << 4;
1012 while (*p)
1013 hashval += *p++;
1014 hashval &= 0x7FFF;
1015 pp = &cmdtable[hashval % CMDTABLESIZE];
1016 for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
1017 if (equal(cmdp->cmdname, name))
1018 break;
1019 pp = &cmdp->next;
1020 }
1021 if (add && cmdp == NULL) {
1022 INTOFF;
1023 cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
1024 + strlen(name) + 1);
1025 cmdp->next = NULL;
1026 cmdp->cmdtype = CMDUNKNOWN;
1027 cmdp->rehash = 0;
1028 strcpy(cmdp->cmdname, name);
1029 INTON;
1030 }
1031 lastcmdentry = pp;
1032 return cmdp;
1033}
1034
1035/*
1036 * Delete the command entry returned on the last lookup.
1037 */
1038
1039STATIC void
1040delete_cmd_entry(void)
1041{
1042 struct tblentry *cmdp;
1043
1044 INTOFF;
1045 cmdp = *lastcmdentry;
1046 *lastcmdentry = cmdp->next;
1047 ckfree(cmdp);
1048 INTON;
1049}
1050
1051
1052
1053#ifdef notdef
1054void
1055getcmdentry(char *name, struct cmdentry *entry)
1056{
1057 struct tblentry *cmdp = cmdlookup(name, 0);
1058
1059 if (cmdp) {
1060 entry->u = cmdp->param;
1061 entry->cmdtype = cmdp->cmdtype;
1062 } else {
1063 entry->cmdtype = CMDUNKNOWN;
1064 entry->u.index = 0;
1065 }
1066}
1067#endif
1068
1069
1070/*
1071 * Add a new command entry, replacing any existing command entry for
1072 * the same name - except special builtins.
1073 */
1074
1075STATIC void
1076addcmdentry(char *name, struct cmdentry *entry)
1077{
1078 struct tblentry *cmdp;
1079
1080 INTOFF;
1081 cmdp = cmdlookup(name, 1);
1082 if (cmdp->cmdtype != CMDSPLBLTIN) {
1083 if (cmdp->cmdtype == CMDFUNCTION) {
1084 freefunc(cmdp->param.func);
1085 }
1086 cmdp->cmdtype = entry->cmdtype;
1087 cmdp->param = entry->u;
1088 }
1089 INTON;
1090}
1091
1092
1093/*
1094 * Define a shell function.
1095 */
1096
1097void
1098defun(char *name, union node *func)
1099{
1100 struct cmdentry entry;
1101
1102 INTOFF;
1103 entry.cmdtype = CMDFUNCTION;
1104 entry.u.func = copyfunc(func);
1105 addcmdentry(name, &entry);
1106 INTON;
1107}
1108
1109
1110/*
1111 * Delete a function if it exists.
1112 */
1113
1114int
1115unsetfunc(char *name)
1116{
1117 struct tblentry *cmdp;
1118
1119 if ((cmdp = cmdlookup(name, 0)) != NULL &&
1120 cmdp->cmdtype == CMDFUNCTION) {
1121 freefunc(cmdp->param.func);
1122 delete_cmd_entry();
1123 return (0);
1124 }
1125 return (1);
1126}
1127
1128/*
1129 * Locate and print what a word is...
1130 * also used for 'command -[v|V]'
1131 */
1132
1133int
1134typecmd(int argc, char **argv)
1135{
1136 struct cmdentry entry;
1137 struct tblentry *cmdp;
1138 char * const *pp;
1139 struct alias *ap;
1140 int err = 0;
1141 char *arg;
1142 int c;
1143 int V_flag = 0;
1144 int v_flag = 0;
1145 int p_flag = 0;
1146
1147 while ((c = nextopt("vVp")) != 0) {
1148 switch (c) {
1149 case 'v': v_flag = 1; break;
1150 case 'V': V_flag = 1; break;
1151 case 'p': p_flag = 1; break;
1152 }
1153 }
1154
1155 if (p_flag && (v_flag || V_flag))
1156 error("cannot specify -p with -v or -V");
1157
1158 while ((arg = *argptr++)) {
1159 if (!v_flag)
1160 out1str(arg);
1161 /* First look at the keywords */
1162 for (pp = parsekwd; *pp; pp++)
1163 if (**pp == *arg && equal(*pp, arg))
1164 break;
1165
1166 if (*pp) {
1167 if (v_flag)
1168 err = 1;
1169 else
1170 out1str(" is a shell keyword\n");
1171 continue;
1172 }
1173
1174 /* Then look at the aliases */
1175 if ((ap = lookupalias(arg, 1)) != NULL) {
1176 if (!v_flag)
1177 out1fmt(" is an alias for \n");
1178 out1fmt("%s\n", ap->val);
1179 continue;
1180 }
1181
1182 /* Then check if it is a tracked alias */
1183 if ((cmdp = cmdlookup(arg, 0)) != NULL) {
1184 entry.cmdtype = cmdp->cmdtype;
1185 entry.u = cmdp->param;
1186 } else {
1187 /* Finally use brute force */
1188 find_command(arg, &entry, DO_ABS, pathval());
1189 }
1190
1191 switch (entry.cmdtype) {
1192 case CMDNORMAL: {
1193 if (strchr(arg, '/') == NULL) {
1194 const char *path = pathval();
1195 char *name;
1196 int j = entry.u.index;
1197 do {
1198 name = padvance(&path, arg);
1199 stunalloc(name);
1200 } while (--j >= 0);
1201 if (!v_flag)
1202 out1fmt(" is%s ",
1203 cmdp ? " a tracked alias for" : "");
1204 out1fmt("%s\n", name);
1205 } else {
1206 if (access(arg, X_OK) == 0) {
1207 if (!v_flag)
1208 out1fmt(" is ");
1209 out1fmt("%s\n", arg);
1210 } else {
1211 if (!v_flag)
1212 out1fmt(": %s\n",
1213 strerror(errno));
1214 else
1215 err = 126;
1216 }
1217 }
1218 break;
1219 }
1220 case CMDFUNCTION:
1221 if (!v_flag)
1222 out1str(" is a shell function\n");
1223 else
1224 out1fmt("%s\n", arg);
1225 break;
1226
1227 case CMDBUILTIN:
1228 if (!v_flag)
1229 out1str(" is a shell builtin\n");
1230 else
1231 out1fmt("%s\n", arg);
1232 break;
1233
1234 case CMDSPLBLTIN:
1235 if (!v_flag)
1236 out1str(" is a special shell builtin\n");
1237 else
1238 out1fmt("%s\n", arg);
1239 break;
1240
1241 default:
1242 if (!v_flag)
1243 out1str(": not found\n");
1244 err = 127;
1245 break;
1246 }
1247 }
1248 return err;
1249}
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