exec.c revision 94775 
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
41static const char rcsid[] =
42  "$FreeBSD: head/bin/sh/exec.c 94775 2002-04-15 15:49:30Z greid $";
43#endif /* not lint */
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				printentry(cmdp, verbose);
340			}
341		}
342		return 0;
343	}
344	while ((name = *argptr) != NULL) {
345		if ((cmdp = cmdlookup(name, 0)) != NULL
346		 && (cmdp->cmdtype == CMDNORMAL
347		     || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)))
348			delete_cmd_entry();
349		find_command(name, &entry, 1, pathval());
350		if (verbose) {
351			if (entry.cmdtype != CMDUNKNOWN) {	/* if no error msg */
352				cmdp = cmdlookup(name, 0);
353				if (cmdp != NULL)
354					printentry(cmdp, verbose);
355				else
356					outfmt(&errout, "%s: not found\n", name);
357			}
358			flushall();
359		}
360		argptr++;
361	}
362	return 0;
363}
364
365
366STATIC void
367printentry(struct tblentry *cmdp, int verbose)
368{
369	int index;
370	char *path;
371	char *name;
372
373	if (cmdp->cmdtype == CMDNORMAL) {
374		index = cmdp->param.index;
375		path = pathval();
376		do {
377			name = padvance(&path, cmdp->cmdname);
378			stunalloc(name);
379		} while (--index >= 0);
380		out1str(name);
381	} else if (cmdp->cmdtype == CMDBUILTIN) {
382		out1fmt("builtin %s", cmdp->cmdname);
383	} else if (cmdp->cmdtype == CMDFUNCTION) {
384		out1fmt("function %s", cmdp->cmdname);
385		if (verbose) {
386			INTOFF;
387			name = commandtext(cmdp->param.func);
388			out1c(' ');
389			out1str(name);
390			ckfree(name);
391			INTON;
392		}
393#ifdef DEBUG
394	} else {
395		error("internal error: cmdtype %d", cmdp->cmdtype);
396#endif
397	}
398	if (cmdp->rehash)
399		out1c('*');
400	out1c('\n');
401}
402
403
404
405/*
406 * Resolve a command name.  If you change this routine, you may have to
407 * change the shellexec routine as well.
408 */
409
410void
411find_command(char *name, struct cmdentry *entry, int printerr, char *path)
412{
413	struct tblentry *cmdp;
414	int index;
415	int prev;
416	char *fullname;
417	struct stat statb;
418	int e;
419	int i;
420
421	/* If name contains a slash, don't use the hash table */
422	if (strchr(name, '/') != NULL) {
423		entry->cmdtype = CMDNORMAL;
424		entry->u.index = 0;
425		return;
426	}
427
428	/* If name is in the table, and not invalidated by cd, we're done */
429	if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->rehash == 0)
430		goto success;
431
432	/* If %builtin not in path, check for builtin next */
433	if (builtinloc < 0 && (i = find_builtin(name)) >= 0) {
434		INTOFF;
435		cmdp = cmdlookup(name, 1);
436		cmdp->cmdtype = CMDBUILTIN;
437		cmdp->param.index = i;
438		INTON;
439		goto success;
440	}
441
442	/* We have to search path. */
443	prev = -1;		/* where to start */
444	if (cmdp) {		/* doing a rehash */
445		if (cmdp->cmdtype == CMDBUILTIN)
446			prev = builtinloc;
447		else
448			prev = cmdp->param.index;
449	}
450
451	e = ENOENT;
452	index = -1;
453loop:
454	while ((fullname = padvance(&path, name)) != NULL) {
455		stunalloc(fullname);
456		index++;
457		if (pathopt) {
458			if (prefix("builtin", pathopt)) {
459				if ((i = find_builtin(name)) < 0)
460					goto loop;
461				INTOFF;
462				cmdp = cmdlookup(name, 1);
463				cmdp->cmdtype = CMDBUILTIN;
464				cmdp->param.index = i;
465				INTON;
466				goto success;
467			} else if (prefix("func", pathopt)) {
468				/* handled below */
469			} else {
470				goto loop;	/* ignore unimplemented options */
471			}
472		}
473		/* if rehash, don't redo absolute path names */
474		if (fullname[0] == '/' && index <= prev) {
475			if (index < prev)
476				goto loop;
477			TRACE(("searchexec \"%s\": no change\n", name));
478			goto success;
479		}
480		while (stat(fullname, &statb) < 0) {
481#ifdef SYSV
482			if (errno == EINTR)
483				continue;
484#endif
485			if (errno != ENOENT && errno != ENOTDIR)
486				e = errno;
487			goto loop;
488		}
489		e = EACCES;	/* if we fail, this will be the error */
490		if (!S_ISREG(statb.st_mode))
491			goto loop;
492		if (pathopt) {		/* this is a %func directory */
493			stalloc(strlen(fullname) + 1);
494			readcmdfile(fullname);
495			if ((cmdp = cmdlookup(name, 0)) == NULL || cmdp->cmdtype != CMDFUNCTION)
496				error("%s not defined in %s", name, fullname);
497			stunalloc(fullname);
498			goto success;
499		}
500#ifdef notdef
501		if (statb.st_uid == geteuid()) {
502			if ((statb.st_mode & 0100) == 0)
503				goto loop;
504		} else if (statb.st_gid == getegid()) {
505			if ((statb.st_mode & 010) == 0)
506				goto loop;
507		} else {
508			if ((statb.st_mode & 01) == 0)
509				goto loop;
510		}
511#endif
512		TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname));
513		INTOFF;
514		cmdp = cmdlookup(name, 1);
515		cmdp->cmdtype = CMDNORMAL;
516		cmdp->param.index = index;
517		INTON;
518		goto success;
519	}
520
521	/* We failed.  If there was an entry for this command, delete it */
522	if (cmdp)
523		delete_cmd_entry();
524	if (printerr)
525		outfmt(out2, "%s: %s\n", name, errmsg(e, E_EXEC));
526	entry->cmdtype = CMDUNKNOWN;
527	return;
528
529success:
530	cmdp->rehash = 0;
531	entry->cmdtype = cmdp->cmdtype;
532	entry->u = cmdp->param;
533}
534
535
536
537/*
538 * Search the table of builtin commands.
539 */
540
541int
542find_builtin(char *name)
543{
544	const struct builtincmd *bp;
545
546	for (bp = builtincmd ; bp->name ; bp++) {
547		if (*bp->name == *name && equal(bp->name, name))
548			return bp->code;
549	}
550	return -1;
551}
552
553
554
555/*
556 * Called when a cd is done.  Marks all commands so the next time they
557 * are executed they will be rehashed.
558 */
559
560void
561hashcd(void)
562{
563	struct tblentry **pp;
564	struct tblentry *cmdp;
565
566	for (pp = cmdtable ; pp < &cmdtable[CMDTABLESIZE] ; pp++) {
567		for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
568			if (cmdp->cmdtype == CMDNORMAL
569			 || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0))
570				cmdp->rehash = 1;
571		}
572	}
573}
574
575
576
577/*
578 * Called before PATH is changed.  The argument is the new value of PATH;
579 * pathval() still returns the old value at this point.  Called with
580 * interrupts off.
581 */
582
583void
584changepath(const char *newval)
585{
586	const char *old, *new;
587	int index;
588	int firstchange;
589	int bltin;
590
591	old = pathval();
592	new = newval;
593	firstchange = 9999;	/* assume no change */
594	index = 0;
595	bltin = -1;
596	for (;;) {
597		if (*old != *new) {
598			firstchange = index;
599			if ((*old == '\0' && *new == ':')
600			 || (*old == ':' && *new == '\0'))
601				firstchange++;
602			old = new;	/* ignore subsequent differences */
603		}
604		if (*new == '\0')
605			break;
606		if (*new == '%' && bltin < 0 && prefix("builtin", new + 1))
607			bltin = index;
608		if (*new == ':') {
609			index++;
610		}
611		new++, old++;
612	}
613	if (builtinloc < 0 && bltin >= 0)
614		builtinloc = bltin;		/* zap builtins */
615	if (builtinloc >= 0 && bltin < 0)
616		firstchange = 0;
617	clearcmdentry(firstchange);
618	builtinloc = bltin;
619}
620
621
622/*
623 * Clear out command entries.  The argument specifies the first entry in
624 * PATH which has changed.
625 */
626
627void
628clearcmdentry(int firstchange)
629{
630	struct tblentry **tblp;
631	struct tblentry **pp;
632	struct tblentry *cmdp;
633
634	INTOFF;
635	for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
636		pp = tblp;
637		while ((cmdp = *pp) != NULL) {
638			if ((cmdp->cmdtype == CMDNORMAL &&
639			     cmdp->param.index >= firstchange)
640			 || (cmdp->cmdtype == CMDBUILTIN &&
641			     builtinloc >= firstchange)) {
642				*pp = cmdp->next;
643				ckfree(cmdp);
644			} else {
645				pp = &cmdp->next;
646			}
647		}
648	}
649	INTON;
650}
651
652
653/*
654 * Delete all functions.
655 */
656
657#ifdef mkinit
658MKINIT void deletefuncs();
659
660SHELLPROC {
661	deletefuncs();
662}
663#endif
664
665void
666deletefuncs(void)
667{
668	struct tblentry **tblp;
669	struct tblentry **pp;
670	struct tblentry *cmdp;
671
672	INTOFF;
673	for (tblp = cmdtable ; tblp < &cmdtable[CMDTABLESIZE] ; tblp++) {
674		pp = tblp;
675		while ((cmdp = *pp) != NULL) {
676			if (cmdp->cmdtype == CMDFUNCTION) {
677				*pp = cmdp->next;
678				freefunc(cmdp->param.func);
679				ckfree(cmdp);
680			} else {
681				pp = &cmdp->next;
682			}
683		}
684	}
685	INTON;
686}
687
688
689
690/*
691 * Locate a command in the command hash table.  If "add" is nonzero,
692 * add the command to the table if it is not already present.  The
693 * variable "lastcmdentry" is set to point to the address of the link
694 * pointing to the entry, so that delete_cmd_entry can delete the
695 * entry.
696 */
697
698struct tblentry **lastcmdentry;
699
700
701STATIC struct tblentry *
702cmdlookup(char *name, int add)
703{
704	int hashval;
705	char *p;
706	struct tblentry *cmdp;
707	struct tblentry **pp;
708
709	p = name;
710	hashval = *p << 4;
711	while (*p)
712		hashval += *p++;
713	hashval &= 0x7FFF;
714	pp = &cmdtable[hashval % CMDTABLESIZE];
715	for (cmdp = *pp ; cmdp ; cmdp = cmdp->next) {
716		if (equal(cmdp->cmdname, name))
717			break;
718		pp = &cmdp->next;
719	}
720	if (add && cmdp == NULL) {
721		INTOFF;
722		cmdp = *pp = ckmalloc(sizeof (struct tblentry) - ARB
723					+ strlen(name) + 1);
724		cmdp->next = NULL;
725		cmdp->cmdtype = CMDUNKNOWN;
726		cmdp->rehash = 0;
727		strcpy(cmdp->cmdname, name);
728		INTON;
729	}
730	lastcmdentry = pp;
731	return cmdp;
732}
733
734/*
735 * Delete the command entry returned on the last lookup.
736 */
737
738STATIC void
739delete_cmd_entry(void)
740{
741	struct tblentry *cmdp;
742
743	INTOFF;
744	cmdp = *lastcmdentry;
745	*lastcmdentry = cmdp->next;
746	ckfree(cmdp);
747	INTON;
748}
749
750
751
752/*
753 * Add a new command entry, replacing any existing command entry for
754 * the same name.
755 */
756
757void
758addcmdentry(char *name, struct cmdentry *entry)
759{
760	struct tblentry *cmdp;
761
762	INTOFF;
763	cmdp = cmdlookup(name, 1);
764	if (cmdp->cmdtype == CMDFUNCTION) {
765		freefunc(cmdp->param.func);
766	}
767	cmdp->cmdtype = entry->cmdtype;
768	cmdp->param = entry->u;
769	INTON;
770}
771
772
773/*
774 * Define a shell function.
775 */
776
777void
778defun(char *name, union node *func)
779{
780	struct cmdentry entry;
781
782	INTOFF;
783	entry.cmdtype = CMDFUNCTION;
784	entry.u.func = copyfunc(func);
785	addcmdentry(name, &entry);
786	INTON;
787}
788
789
790/*
791 * Delete a function if it exists.
792 */
793
794int
795unsetfunc(char *name)
796{
797	struct tblentry *cmdp;
798
799	if ((cmdp = cmdlookup(name, 0)) != NULL && cmdp->cmdtype == CMDFUNCTION) {
800		freefunc(cmdp->param.func);
801		delete_cmd_entry();
802		return (0);
803	}
804	return (1);
805}
806
807/*
808 * Locate and print what a word is...
809 */
810
811int
812typecmd(int argc, char **argv)
813{
814	struct cmdentry entry;
815	struct tblentry *cmdp;
816	char **pp;
817	struct alias *ap;
818	int i;
819	int error = 0;
820	extern char *const parsekwd[];
821
822	for (i = 1; i < argc; i++) {
823		out1str(argv[i]);
824		/* First look at the keywords */
825		for (pp = (char **)parsekwd; *pp; pp++)
826			if (**pp == *argv[i] && equal(*pp, argv[i]))
827				break;
828
829		if (*pp) {
830			out1str(" is a shell keyword\n");
831			continue;
832		}
833
834		/* Then look at the aliases */
835		if ((ap = lookupalias(argv[i], 1)) != NULL) {
836			out1fmt(" is an alias for %s\n", ap->val);
837			continue;
838		}
839
840		/* Then check if it is a tracked alias */
841		if ((cmdp = cmdlookup(argv[i], 0)) != NULL) {
842			entry.cmdtype = cmdp->cmdtype;
843			entry.u = cmdp->param;
844		}
845		else {
846			/* Finally use brute force */
847			find_command(argv[i], &entry, 0, pathval());
848		}
849
850		switch (entry.cmdtype) {
851		case CMDNORMAL: {
852			if (strchr(argv[i], '/') == NULL) {
853				char *path = pathval(), *name;
854				int j = entry.u.index;
855				do {
856					name = padvance(&path, argv[i]);
857					stunalloc(name);
858				} while (--j >= 0);
859				out1fmt(" is%s %s\n",
860				    cmdp ? " a tracked alias for" : "", name);
861			} else {
862				if (access(argv[i], X_OK) == 0)
863					out1fmt(" is %s\n", argv[i]);
864				else
865					out1fmt(": %s\n", strerror(errno));
866			}
867			break;
868		}
869		case CMDFUNCTION:
870			out1str(" is a shell function\n");
871			break;
872
873		case CMDBUILTIN:
874			out1str(" is a shell builtin\n");
875			break;
876
877		default:
878			out1str(": not found\n");
879			error |= 127;
880			break;
881		}
882	}
883	return error;
884}
885