exec.c revision 99110 
1/*-
2 * Copyright (c) 1991, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kenneth Almquist.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#ifndef lint
38#if 0
39static char sccsid[] = "@(#)exec.c	8.4 (Berkeley) 6/8/95";
40#endif
41#endif /* not lint */
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: head/bin/sh/exec.c 99110 2002-06-30 05:15:05Z obrien $");
44
45#include <sys/types.h>
46#include <sys/stat.h>
47#include <unistd.h>
48#include <fcntl.h>
49#include <errno.h>
50#include <stdlib.h>
51
52/*
53 * When commands are first encountered, they are entered in a hash table.
54 * This ensures that a full path search will not have to be done for them
55 * on each invocation.
56 *
57 * We should investigate converting to a linear search, even though that
58 * would make the command name "hash" a misnomer.
59 */
60
61#include "shell.h"
62#include "main.h"
63#include "nodes.h"
64#include "parser.h"
65#include "redir.h"
66#include "eval.h"
67#include "exec.h"
68#include "builtins.h"
69#include "var.h"
70#include "options.h"
71#include "input.h"
72#include "output.h"
73#include "syntax.h"
74#include "memalloc.h"
75#include "error.h"
76#include "init.h"
77#include "mystring.h"
78#include "show.h"
79#include "jobs.h"
80#include "alias.h"
81
82
83#define CMDTABLESIZE 31		/* should be prime */
84#define ARB 1			/* actual size determined at run time */
85
86
87
88struct tblentry {
89	struct tblentry *next;	/* next entry in hash chain */
90	union param param;	/* definition of builtin function */
91	short cmdtype;		/* index identifying command */
92	char rehash;		/* if set, cd done since entry created */
93	char cmdname[ARB];	/* name of command */
94};
95
96
97STATIC struct tblentry *cmdtable[CMDTABLESIZE];
98STATIC int builtinloc = -1;		/* index in path of %builtin, or -1 */
99int exerrno = 0;			/* Last exec error */
100
101
102STATIC void tryexec(char *, char **, char **);
103#ifndef BSD
104STATIC void execinterp(char **, char **);
105#endif
106STATIC void printentry(struct tblentry *, int);
107STATIC struct tblentry *cmdlookup(char *, int);
108STATIC void delete_cmd_entry(void);
109
110
111
112/*
113 * Exec a program.  Never returns.  If you change this routine, you may
114 * have to change the find_command routine as well.
115 */
116
117void
118shellexec(char **argv, char **envp, char *path, int index)
119{
120	char *cmdname;
121	int e;
122
123	if (strchr(argv[0], '/') != NULL) {
124		tryexec(argv[0], argv, envp);
125		e = errno;
126	} else {
127		e = ENOENT;
128		while ((cmdname = padvance(&path, argv[0])) != NULL) {
129			if (--index < 0 && pathopt == NULL) {
130				tryexec(cmdname, argv, envp);
131				if (errno != ENOENT && errno != ENOTDIR)
132					e = errno;
133			}
134			stunalloc(cmdname);
135		}
136	}
137
138	/* Map to POSIX errors */
139	switch (e) {
140	case EACCES:
141		exerrno = 126;
142		break;
143	case ENOENT:
144		exerrno = 127;
145		break;
146	default:
147		exerrno = 2;
148		break;
149	}
150	exerror(EXEXEC, "%s: %s", argv[0], errmsg(e, E_EXEC));
151}
152
153
154STATIC void
155tryexec(char *cmd, char **argv, char **envp)
156{
157	int e;
158#ifndef BSD
159	char *p;
160#endif
161
162#ifdef SYSV
163	do {
164		execve(cmd, argv, envp);
165	} while (errno == EINTR);
166#else
167	execve(cmd, argv, envp);
168#endif
169	e = errno;
170	if (e == ENOEXEC) {
171		initshellproc();
172		setinputfile(cmd, 0);
173		commandname = arg0 = savestr(argv[0]);
174#ifndef BSD
175		pgetc(); pungetc();		/* fill up input buffer */
176		p = parsenextc;
177		if (parsenleft > 2 && p[0] == '#' && p[1] == '!') {
178			argv[0] = cmd;
179			execinterp(argv, envp);
180		}
181#endif
182		setparam(argv + 1);
183		exraise(EXSHELLPROC);
184		/*NOTREACHED*/
185	}
186	errno = e;
187}
188
189
190#ifndef BSD
191/*
192 * Execute an interpreter introduced by "#!", for systems where this
193 * feature has not been built into the kernel.  If the interpreter is
194 * the shell, return (effectively ignoring the "#!").  If the execution
195 * of the interpreter fails, exit.
196 *
197 * This code peeks inside the input buffer in order to avoid actually
198 * reading any input.  It would benefit from a rewrite.
199 */
200
201#define NEWARGS 5
202
203STATIC void
204execinterp(char **argv, char **envp)
205{
206	int n;
207	char *inp;
208	char *outp;
209	char c;
210	char *p;
211	char **ap;
212	char *newargs[NEWARGS];
213	int i;
214	char **ap2;
215	char **new;
216
217	n = parsenleft - 2;
218	inp = parsenextc + 2;
219	ap = newargs;
220	for (;;) {
221		while (--n >= 0 && (*inp == ' ' || *inp == '\t'))
222			inp++;
223		if (n < 0)
224			goto bad;
225		if ((c = *inp++) == '\n')
226			break;
227		if (ap == &newargs[NEWARGS])
228bad:		  error("Bad #! line");
229		STARTSTACKSTR(outp);
230		do {
231			STPUTC(c, outp);
232		} while (--n >= 0 && (c = *inp++) != ' ' && c != '\t' && c != '\n');
233		STPUTC('\0', outp);
234		n++, inp--;
235		*ap++ = grabstackstr(outp);
236	}
237	if (ap == newargs + 1) {	/* if no args, maybe no exec is needed */
238		p = newargs[0];
239		for (;;) {
240			if (equal(p, "sh") || equal(p, "ash")) {
241				return;
242			}
243			while (*p != '/') {
244				if (*p == '\0')
245					goto break2;
246				p++;
247			}
248			p++;
249		}
250break2:;
251	}
252	i = (char *)ap - (char *)newargs;		/* size in bytes */
253	if (i == 0)
254		error("Bad #! line");
255	for (ap2 = argv ; *ap2++ != NULL ; );
256	new = ckmalloc(i + ((char *)ap2 - (char *)argv));
257	ap = newargs, ap2 = new;
258	while ((i -= sizeof (char **)) >= 0)
259		*ap2++ = *ap++;
260	ap = argv;
261	while (*ap2++ = *ap++);
262	shellexec(new, envp, pathval(), 0);
263}
264#endif
265
266
267
268/*
269 * Do a path search.  The variable path (passed by reference) should be
270 * set to the start of the path before the first call; padvance will update
271 * this value as it proceeds.  Successive calls to padvance will return
272 * the possible path expansions in sequence.  If an option (indicated by
273 * a percent sign) appears in the path entry then the global variable
274 * pathopt will be set to point to it; otherwise pathopt will be set to
275 * NULL.
276 */
277
278char *pathopt;
279
280char *
281padvance(char **path, char *name)
282{
283	char *p, *q;
284	char *start;
285	int len;
286
287	if (*path == NULL)
288		return NULL;
289	start = *path;
290	for (p = start ; *p && *p != ':' && *p != '%' ; p++);
291	len = p - start + strlen(name) + 2;	/* "2" is for '/' and '\0' */
292	while (stackblocksize() < len)
293		growstackblock();
294	q = stackblock();
295	if (p != start) {
296		memcpy(q, start, p - start);
297		q += p - start;
298		*q++ = '/';
299	}
300	strcpy(q, name);
301	pathopt = NULL;
302	if (*p == '%') {
303		pathopt = ++p;
304		while (*p && *p != ':')  p++;
305	}
306	if (*p == ':')
307		*path = p + 1;
308	else
309		*path = NULL;
310	return stalloc(len);
311}
312
313
314
315/*** Command hashing code ***/
316
317
318int
319hashcmd(int argc __unused, char **argv __unused)
320{
321	struct tblentry **pp;
322	struct tblentry *cmdp;
323	int c;
324	int verbose;
325	struct cmdentry entry;
326	char *name;
327
328	verbose = 0;
329	while ((c = nextopt("rv")) != '\0') {
330		if (c == 'r') {
331			clearcmdentry(0);
332		} else if (c == 'v') {
333			verbose++;
334		}
335	}
336	if (*argptr == NULL) {
337		for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
338			for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
339				if (cmdp->cmdtype == CMDNORMAL)
340					printentry(cmdp, verbose);
341			}
342		}
343		return 0;
344	}
345	while ((name = *argptr) != NULL) {
346		if ((cmdp = cmdlookup(name, 0)) != NULL
347		 && (cmdp->cmdtype == CMDNORMAL
348		     || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
349			delete_cmd_entry();
350		find_command(name, &entry, 1, pathval());
351		if (verbose) {
352			if (entry.cmdtype != CMDUNKNOWN) {	/* if no error msg */
353				cmdp = cmdlookup(name, 0);
354				if (cmdp != NULL)
355					printentry(cmdp, verbose);
356				else
357					outfmt(&errout, "%s: not found\n", name);
358			}
359			flushall();
360		}
361		argptr++;
362	}
363	return 0;
364}
365
366
367STATIC void
368printentry(struct tblentry *cmdp, int verbose)
369{
370	int index;
371	char *path;
372	char *name;
373
374	if (cmdp->cmdtype == CMDNORMAL) {
375		index = cmdp->param.index;
376		path = pathval();
377		do {
378			name = padvance(&path, cmdp->cmdname);
379			stunalloc(name);
380		} while (--index >= 0);
381		out1str(name);
382	} else if (cmdp->cmdtype == CMDBUILTIN) {
383		out1fmt("builtin %s", cmdp->cmdname);
384	} else if (cmdp->cmdtype == CMDFUNCTION) {
385		out1fmt("function %s", cmdp->cmdname);
386		if (verbose) {
387			INTOFF;
388			name = commandtext(cmdp->param.func);
389			out1c(' ');
390			out1str(name);
391			ckfree(name);
392			INTON;
393		}
394#ifdef DEBUG
395	} else {
396		error("internal error: cmdtype %d", cmdp->cmdtype);
397#endif
398	}
399	if (cmdp->rehash)
400		out1c('*');
401	out1c('\n');
402}
403
404
405
406/*
407 * Resolve a command name.  If you change this routine, you may have to
408 * change the shellexec routine as well.
409 */
410
411void
412find_command(char *name, struct cmdentry *entry, int printerr, char *path)
413{
414	struct tblentry *cmdp;
415	int index;
416	int prev;
417	char *fullname;
418	struct stat statb;
419	int e;
420	int i;
421
422	/* If name contains a slash, don't use the hash table */
423	if (strchr(name, '/') != NULL) {
424		entry->cmdtype = CMDNORMAL;
425		entry->u.index = 0;
426		return;
427	}
428
429	/* If name is in the table, and not invalidated by cd, we're done */
430	if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0)
431		goto success;
432
433	/* If %builtin not in path, check for builtin next */
434	if (builtinloc < 0 && (i = find_builtin(name)) >= 0) {
435		INTOFF;
436		cmdp = cmdlookup(name, 1);
437		cmdp->cmdtype = CMDBUILTIN;
438		cmdp->param.index = i;
439		INTON;
440		goto success;
441	}
442
443	/* We have to search path. */
444	prev = -1;		/* where to start */
445	if (cmdp) {		/* doing a rehash */
446		if (cmdp->cmdtype == CMDBUILTIN)
447			prev = builtinloc;
448		else
449			prev = cmdp->param.index;
450	}
451
452	e = ENOENT;
453	index = -1;
454loop:
455	while ((fullname = padvance(&path, name)) != NULL) {
456		stunalloc(fullname);
457		index++;
458		if (pathopt) {
459			if (prefix("builtin", pathopt)) {
460				if ((i = find_builtin(name)) < 0)
461					goto loop;
462				INTOFF;
463				cmdp = cmdlookup(name, 1);
464				cmdp->cmdtype = CMDBUILTIN;
465				cmdp->param.index = i;
466				INTON;
467				goto success;
468			} else if (prefix("func", pathopt)) {
469				/* handled below */
470			} else {
471				goto loop;	/* ignore unimplemented options */
472			}
473		}
474		/* if rehash, don't redo absolute path names */
475		if (fullname[0] == '/' && index <= prev) {
476			if (index < prev)
477				goto loop;
478			TRACE(("searchexec \"%s\": no change\n", name));
479			goto success;
480		}
481		while (stat(fullname, &statb) < 0) {
482#ifdef SYSV
483			if (errno == EINTR)
484				continue;
485#endif
486			if (errno != ENOENT && errno != ENOTDIR)
487				e = errno;
488			goto loop;
489		}
490		e = EACCES;	/* if we fail, this will be the error */
491		if (!S_ISREG(statb.st_mode))
492			goto loop;
493		if (pathopt) {		/* this is a %func directory */
494			stalloc(strlen(fullname) + 1);
495			readcmdfile(fullname);
496			if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
497				error("%s not defined in %s", name, fullname);
498			stunalloc(fullname);
499			goto success;
500		}
501#ifdef notdef
502		if (statb.st_uid == geteuid()) {
503			if ((statb.st_mode & 0100) == 0)
504				goto loop;
505		} else if (statb.st_gid == getegid()) {
506			if ((statb.st_mode & 010) == 0)
507				goto loop;
508		} else {
509			if ((statb.st_mode & 01) == 0)
510				goto loop;
511		}
512#endif
513		TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
514		INTOFF;
515		cmdp = cmdlookup(name, 1);
516		cmdp->cmdtype = CMDNORMAL;
517		cmdp->param.index = index;
518		INTON;
519		goto success;
520	}
521
522	/* We failed.  If there was an entry for this command, delete it */
523	if (cmdp)
524		delete_cmd_entry();
525	if (printerr)
526		outfmt(out2, "%s: %s\n", name, errmsg(e, E_EXEC));
527	entry->cmdtype = CMDUNKNOWN;
528	return;
529
530success:
531	cmdp->rehash = 0;
532	entry->cmdtype = cmdp->cmdtype;
533	entry->u = cmdp->param;
534}
535
536
537
538/*
539 * Search the table of builtin commands.
540 */
541
542int
543find_builtin(char *name)
544{
545	const struct builtincmd *bp;
546
547	for (bp = builtincmd ; bp->name ; bp++) {
548		if (*bp->name == *name && equal(bp->name, name))
549			return bp->code;
550	}
551	return -1;
552}
553
554
555
556/*
557 * Called when a cd is done.  Marks all commands so the next time they
558 * are executed they will be rehashed.
559 */
560
561void
562hashcd(void)
563{
564	struct tblentry **pp;
565	struct tblentry *cmdp;
566
567	for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
568		for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
569			if (cmdp->cmdtype == CMDNORMAL
570			 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
571				cmdp->rehash = 1;
572		}
573	}
574}
575
576
577
578/*
579 * Called before PATH is changed.  The argument is the new value of PATH;
580 * pathval() still returns the old value at this point.  Called with
581 * interrupts off.
582 */
583
584void
585changepath(const char *newval)
586{
587	const char *old, *new;
588	int index;
589	int firstchange;
590	int bltin;
591
592	old = pathval();
593	new = newval;
594	firstchange = 9999;	/* assume no change */
595	index = 0;
596	bltin = -1;
597	for (;;) {
598		if (*old != *new) {
599			firstchange = index;
600			if ((*old == '\0' && *new == ':')
601			 || (*old == ':' && *new == '\0'))
602				firstchange++;
603			old = new;	/* ignore subsequent differences */
604		}
605		if (*new == '\0')
606			break;
607		if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
608			bltin = index;
609		if (*new == ':') {
610			index++;
611		}
612		new++, old++;
613	}
614	if (builtinloc < 0 && bltin >= 0)
615		builtinloc = bltin;		/* zap builtins */
616	if (builtinloc >= 0 && bltin < 0)
617		firstchange = 0;
618	clearcmdentry(firstchange);
619	builtinloc = bltin;
620}
621
622
623/*
624 * Clear out command entries.  The argument specifies the first entry in
625 * PATH which has changed.
626 */
627
628void
629clearcmdentry(int firstchange)
630{
631	struct tblentry **tblp;
632	struct tblentry **pp;
633	struct tblentry *cmdp;
634
635	INTOFF;
636	for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
637		pp = tblp;
638		while ((cmdp = *pp) != NULL) {
639			if ((cmdp->cmdtype == CMDNORMAL &&
640			     cmdp->param.index >= firstchange)
641			 || (cmdp->cmdtype == CMDBUILTIN &&
642			     builtinloc >= firstchange)) {
643				*pp = cmdp->next;
644				ckfree(cmdp);
645			} else {
646				pp = &cmdp->next;
647			}
648		}
649	}
650	INTON;
651}
652
653
654/*
655 * Delete all functions.
656 */
657
658#ifdef mkinit
659MKINIT void deletefuncs();
660
661SHELLPROC {
662	deletefuncs();
663}
664#endif
665
666void
667deletefuncs(void)
668{
669	struct tblentry **tblp;
670	struct tblentry **pp;
671	struct tblentry *cmdp;
672
673	INTOFF;
674	for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
675		pp = tblp;
676		while ((cmdp = *pp) != NULL) {
677			if (cmdp->cmdtype == CMDFUNCTION) {
678				*pp = cmdp->next;
679				freefunc(cmdp->param.func);
680				ckfree(cmdp);
681			} else {
682				pp = &cmdp->next;
683			}
684		}
685	}
686	INTON;
687}
688
689
690
691/*
692 * Locate a command in the command hash table.  If "add" is nonzero,
693 * add the command to the table if it is not already present.  The
694 * variable "lastcmdentry" is set to point to the address of the link
695 * pointing to the entry, so that delete_cmd_entry can delete the
696 * entry.
697 */
698
699struct tblentry **lastcmdentry;
700
701
702STATIC struct tblentry *
703cmdlookup(char *name, int add)
704{
705	int hashval;
706	char *p;
707	struct tblentry *cmdp;
708	struct tblentry **pp;
709
710	p = name;
711	hashval = *p << 4;
712	while (*p)
713		hashval += *p++;
714	hashval &= 0x7FFF;
715	pp = &cmdtable[hashval % CMDTABLESIZE];
716	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
717		if (equal(cmdp->cmdname, name))
718			break;
719		pp = &cmdp->next;
720	}
721	if (add && cmdp == NULL) {
722		INTOFF;
723		cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
724					+ strlen(name) + 1);
725		cmdp->next = NULL;
726		cmdp->cmdtype = CMDUNKNOWN;
727		cmdp->rehash = 0;
728		strcpy(cmdp->cmdname, name);
729		INTON;
730	}
731	lastcmdentry = pp;
732	return cmdp;
733}
734
735/*
736 * Delete the command entry returned on the last lookup.
737 */
738
739STATIC void
740delete_cmd_entry(void)
741{
742	struct tblentry *cmdp;
743
744	INTOFF;
745	cmdp = *lastcmdentry;
746	*lastcmdentry = cmdp->next;
747	ckfree(cmdp);
748	INTON;
749}
750
751
752
753/*
754 * Add a new command entry, replacing any existing command entry for
755 * the same name.
756 */
757
758void
759addcmdentry(char *name, struct cmdentry *entry)
760{
761	struct tblentry *cmdp;
762
763	INTOFF;
764	cmdp = cmdlookup(name, 1);
765	if (cmdp->cmdtype == CMDFUNCTION) {
766		freefunc(cmdp->param.func);
767	}
768	cmdp->cmdtype = entry->cmdtype;
769	cmdp->param = entry->u;
770	INTON;
771}
772
773
774/*
775 * Define a shell function.
776 */
777
778void
779defun(char *name, union node *func)
780{
781	struct cmdentry entry;
782
783	INTOFF;
784	entry.cmdtype = CMDFUNCTION;
785	entry.u.func = copyfunc(func);
786	addcmdentry(name, &entry);
787	INTON;
788}
789
790
791/*
792 * Delete a function if it exists.
793 */
794
795int
796unsetfunc(char *name)
797{
798	struct tblentry *cmdp;
799
800	if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
801		freefunc(cmdp->param.func);
802		delete_cmd_entry();
803		return (0);
804	}
805	return (1);
806}
807
808/*
809 * Locate and print what a word is...
810 */
811
812int
813typecmd(int argc, char **argv)
814{
815	struct cmdentry entry;
816	struct tblentry *cmdp;
817	char **pp;
818	struct alias *ap;
819	int i;
820	int error = 0;
821	extern char *const parsekwd[];
822
823	for (i = 1; i < argc; i++) {
824		out1str(argv[i]);
825		/* First look at the keywords */
826		for (pp = (char **)parsekwd; *pp; pp++)
827			if (**pp == *argv[i] && equal(*pp, argv[i]))
828				break;
829
830		if (*pp) {
831			out1str(" is a shell keyword\n");
832			continue;
833		}
834
835		/* Then look at the aliases */
836		if ((ap = lookupalias(argv[i], 1)) != NULL) {
837			out1fmt(" is an alias for %s\n", ap->val);
838			continue;
839		}
840
841		/* Then check if it is a tracked alias */
842		if ((cmdp = cmdlookup(argv[i], 0)) != NULL) {
843			entry.cmdtype = cmdp->cmdtype;
844			entry.u = cmdp->param;
845		}
846		else {
847			/* Finally use brute force */
848			find_command(argv[i], &entry, 0, pathval());
849		}
850
851		switch (entry.cmdtype) {
852		case CMDNORMAL: {
853			if (strchr(argv[i], '/') == NULL) {
854				char *path = pathval(), *name;
855				int j = entry.u.index;
856				do {
857					name = padvance(&path, argv[i]);
858					stunalloc(name);
859				} while (--j >= 0);
860				out1fmt(" is%s %s\n",
861				    cmdp ? " a tracked alias for" : "", name);
862			} else {
863				if (access(argv[i], X_OK) == 0)
864					out1fmt(" is %s\n", argv[i]);
865				else
866					out1fmt(": %s\n", strerror(errno));
867			}
868			break;
869		}
870		case CMDFUNCTION:
871			out1str(" is a shell function\n");
872			break;
873
874		case CMDBUILTIN:
875			out1str(" is a shell builtin\n");
876			break;
877
878		default:
879			out1str(": not found\n");
880			error |= 127;
881			break;
882		}
883	}
884	return error;
885}
886