2 * Copyright (c) 1991, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. 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.
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
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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
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33 * $FreeBSD: src/lib/libc/gen/exec.c,v 1.15 2000/01/27 23:06:14 jasone Exp $
36 #if defined(LIBC_SCCS) && !defined(lint)
38 static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93";
40 static const char rcsid[] =
41 "$FreeBSD: src/lib/libc/gen/exec.c,v 1.15 2000/01/27 23:06:14 jasone Exp $";
42 #endif /* LIBC_SCCS and not lint */
44 #include <sys/param.h>
45 #include <sys/types.h>
60 extern char **environ;
64 execl(const char *name, const char *arg, ...)
66 execl(name, arg, va_alist)
82 while (va_arg(ap, char *) != NULL)
85 argv = alloca((n + 1) * sizeof(*argv));
96 argv[0] = (char *)arg;
97 while ((argv[n] = va_arg(ap, char *)) != NULL)
100 return (execve(name, argv, environ));
105 execle(const char *name, const char *arg, ...)
107 execle(name, arg, va_alist)
123 while (va_arg(ap, char *) != NULL)
126 argv = alloca((n + 1) * sizeof(*argv));
137 argv[0] = (char *)arg;
138 while ((argv[n] = va_arg(ap, char *)) != NULL)
140 envp = va_arg(ap, char **);
142 return (execve(name, argv, envp));
147 execlp(const char *name, const char *arg, ...)
149 execlp(name, arg, va_alist)
166 while (va_arg(ap, char *) != NULL)
169 argv = alloca((n + 1) * sizeof(*argv));
180 argv[0] = (char *)arg;
181 while ((argv[n] = va_arg(ap, char *)) != NULL)
184 return (execvp(name, argv));
192 (void)execve(name, argv, environ);
202 register int cnt, lp, ln;
204 int eacces, save_errno;
205 char *bp, *cur, *path, buf[MAXPATHLEN];
210 /* If it's an absolute or relative path name, it's easy. */
211 if (index(name, '/')) {
218 /* If it's an empty path name, fail in the usual POSIX way. */
224 /* Get the path we're searching. */
225 if (!(path = getenv("PATH")))
226 path = _PATH_DEFPATH;
227 cur = alloca(strlen(path) + 1);
234 while ( (p = strsep(&cur, ":")) ) {
236 * It's a SHELL path -- double, leading and trailing colons
237 * mean the current directory.
247 * If the path is too long complain. This is a possible
248 * security issue; given a way to make the path too long
249 * the user may execute the wrong program.
251 if (lp + ln + 2 > sizeof(buf)) {
252 (void)_write(STDERR_FILENO, "execvp: ", 8);
253 (void)_write(STDERR_FILENO, p, lp);
254 (void)_write(STDERR_FILENO, ": path too long\n",
260 bcopy(name, buf + lp + 1, ln);
261 buf[lp + ln + 1] = '\0';
263 retry: (void)execve(bp, argv, environ);
272 for (cnt = 0; argv[cnt]; ++cnt)
274 memp = alloca((cnt + 2) * sizeof(char *));
276 /* errno = ENOMEM; XXX override ENOEXEC? */
281 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
282 (void)execve(_PATH_BSHELL, memp, environ);
290 * We used to retry here, but sh(1) doesn't.
295 * EACCES may be for an inaccessible directory or
296 * a non-executable file. Call stat() to decide
297 * which. This also handles ambiguities for EFAULT
298 * and EIO, and undocumented errors like ESTALE.
299 * We hope that the race for a stat() is unimportant.
302 if (stat(bp, &sb) != 0)
304 if (save_errno == EACCES) {