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 1.5 2005/01/31 22:29:15 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 "namespace.h"
41 #include <sys/param.h>
42 #include <sys/types.h>
50 #include "un-namespace.h"
54 extern char **environ;
57 execl(const char *name, const char *arg, ...)
65 while (va_arg(ap, char *) != NULL)
68 argv = alloca((n + 1) * sizeof(*argv));
75 argv[0] = (char *)arg;
76 while ((argv[n] = va_arg(ap, char *)) != NULL)
79 return (_execve(name, argv, environ));
83 execle(const char *name, const char *arg, ...)
91 while (va_arg(ap, char *) != NULL)
94 argv = alloca((n + 1) * sizeof(*argv));
101 argv[0] = (char *)arg;
102 while ((argv[n] = va_arg(ap, char *)) != NULL)
104 envp = va_arg(ap, char **);
106 return (_execve(name, argv, envp));
110 execlp(const char *name, const char *arg, ...)
119 while (va_arg(ap, char *) != NULL)
122 argv = alloca((n + 1) * sizeof(*argv));
129 argv[0] = (char *)arg;
130 while ((argv[n] = va_arg(ap, char *)) != NULL)
133 return (execvp(name, argv));
141 (void)_execve(name, argv, environ);
153 int eacces, save_errno;
154 char *bp, *cur, *path, buf[MAXPATHLEN];
159 /* If it's an absolute or relative path name, it's easy. */
160 if (index(name, '/')) {
167 /* If it's an empty path name, fail in the usual POSIX way. */
173 /* Get the path we're searching. */
174 if (!(path = getenv("PATH")))
175 path = _PATH_DEFPATH;
176 cur = alloca(strlen(path) + 1);
183 while ( (p = strsep(&cur, ":")) ) {
185 * It's a SHELL path -- double, leading and trailing colons
186 * mean the current directory.
196 * If the path is too long complain. This is a possible
197 * security issue; given a way to make the path too long
198 * the user may execute the wrong program.
200 if (lp + ln + 2 > sizeof(buf)) {
201 (void)_write(STDERR_FILENO, "execvp: ", 8);
202 (void)_write(STDERR_FILENO, p, lp);
203 (void)_write(STDERR_FILENO, ": path too long\n",
209 bcopy(name, buf + lp + 1, ln);
210 buf[lp + ln + 1] = '\0';
212 retry: (void)_execve(bp, argv, environ);
221 for (cnt = 0; argv[cnt]; ++cnt)
223 memp = alloca((cnt + 2) * sizeof(char *));
225 /* errno = ENOMEM; XXX override ENOEXEC? */
230 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
231 (void)_execve(_PATH_BSHELL, memp, environ);
239 * We used to retry here, but sh(1) doesn't.
244 * EACCES may be for an inaccessible directory or
245 * a non-executable file. Call stat() to decide
246 * which. This also handles ambiguities for EFAULT
247 * and EIO, and undocumented errors like ESTALE.
248 * We hope that the race for a stat() is unimportant.
251 if (stat(bp, &sb) != 0)
253 if (save_errno == EACCES) {