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
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
33 * $FreeBSD: src/lib/libc/gen/exec.c,v 1.15 2000/01/27 23:06:14 jasone Exp $
34 * $DragonFly: src/lib/libc/gen/exec.c,v 1.2 2003/06/17 04:26:42 dillon Exp $
36 * @(#)exec.c 8.1 (Berkeley) 6/4/93
37 * $FreeBSD: src/lib/libc/gen/exec.c,v 1.15 2000/01/27 23:06:14 jasone Exp $
40 #include <sys/param.h>
41 #include <sys/types.h>
56 extern char **environ;
60 execl(const char *name, const char *arg, ...)
62 execl(name, arg, va_alist)
78 while (va_arg(ap, char *) != NULL)
81 argv = alloca((n + 1) * sizeof(*argv));
92 argv[0] = (char *)arg;
93 while ((argv[n] = va_arg(ap, char *)) != NULL)
96 return (execve(name, argv, environ));
101 execle(const char *name, const char *arg, ...)
103 execle(name, arg, va_alist)
119 while (va_arg(ap, char *) != NULL)
122 argv = alloca((n + 1) * sizeof(*argv));
133 argv[0] = (char *)arg;
134 while ((argv[n] = va_arg(ap, char *)) != NULL)
136 envp = va_arg(ap, char **);
138 return (execve(name, argv, envp));
143 execlp(const char *name, const char *arg, ...)
145 execlp(name, arg, va_alist)
162 while (va_arg(ap, char *) != NULL)
165 argv = alloca((n + 1) * sizeof(*argv));
176 argv[0] = (char *)arg;
177 while ((argv[n] = va_arg(ap, char *)) != NULL)
180 return (execvp(name, argv));
188 (void)execve(name, argv, environ);
198 register int cnt, lp, ln;
200 int eacces, save_errno;
201 char *bp, *cur, *path, buf[MAXPATHLEN];
206 /* If it's an absolute or relative path name, it's easy. */
207 if (index(name, '/')) {
214 /* If it's an empty path name, fail in the usual POSIX way. */
220 /* Get the path we're searching. */
221 if (!(path = getenv("PATH")))
222 path = _PATH_DEFPATH;
223 cur = alloca(strlen(path) + 1);
230 while ( (p = strsep(&cur, ":")) ) {
232 * It's a SHELL path -- double, leading and trailing colons
233 * mean the current directory.
243 * If the path is too long complain. This is a possible
244 * security issue; given a way to make the path too long
245 * the user may execute the wrong program.
247 if (lp + ln + 2 > sizeof(buf)) {
248 (void)_write(STDERR_FILENO, "execvp: ", 8);
249 (void)_write(STDERR_FILENO, p, lp);
250 (void)_write(STDERR_FILENO, ": path too long\n",
256 bcopy(name, buf + lp + 1, ln);
257 buf[lp + ln + 1] = '\0';
259 retry: (void)execve(bp, argv, environ);
268 for (cnt = 0; argv[cnt]; ++cnt)
270 memp = alloca((cnt + 2) * sizeof(char *));
272 /* errno = ENOMEM; XXX override ENOEXEC? */
277 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
278 (void)execve(_PATH_BSHELL, memp, environ);
286 * We used to retry here, but sh(1) doesn't.
291 * EACCES may be for an inaccessible directory or
292 * a non-executable file. Call stat() to decide
293 * which. This also handles ambiguities for EFAULT
294 * and EIO, and undocumented errors like ESTALE.
295 * We hope that the race for a stat() is unimportant.
298 if (stat(bp, &sb) != 0)
300 if (save_errno == EACCES) {