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 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)exec.c 8.1 (Berkeley) 6/4/93
30 * $FreeBSD: src/lib/libc/gen/exec.c,v 1.25 2008/06/23 05:22:06 ed Exp $
31 * $DragonFly: src/lib/libc/gen/exec.c,v 1.7 2005/11/13 00:07:42 swildner Exp $
34 #include "namespace.h"
35 #include <sys/param.h>
36 #include <sys/types.h>
46 #include "un-namespace.h"
47 #include "libc_private.h"
49 extern char **environ;
52 execl(const char *name, const char *arg, ...)
60 while (va_arg(ap, char *) != NULL)
63 argv = alloca((n + 1) * sizeof(*argv));
71 while ((argv[n] = va_arg(ap, const char *)) != NULL)
74 return (_execve(name, __DECONST(char **, argv),
75 __DECONST(char **, environ)));
79 execle(const char *name, const char *arg, ...)
82 const char **argv, **envp;
87 while (va_arg(ap, char *) != NULL)
90 argv = alloca((n + 1) * sizeof(*argv));
98 while ((argv[n] = va_arg(ap, const char *)) != NULL)
100 envp = va_arg(ap, const char **);
102 return (_execve(name, __DECONST(char **, argv),
103 __DECONST(char **, envp)));
107 execlp(const char *name, const char *arg, ...)
115 while (va_arg(ap, char *) != NULL)
118 argv = alloca((n + 1) * sizeof(*argv));
126 while ((argv[n] = va_arg(ap, const char *)) != NULL)
129 return (execvp(name, __DECONST(char **, argv)));
133 execv(const char *name, char * const *argv)
135 _execve(name, argv, environ);
140 execvp(const char *name, char * const *argv)
142 return (_execvpe(name, argv, environ));
146 execvPe(const char *name, const char *path, char * const *argv,
152 int eacces, save_errno;
154 char *cur, 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 cur = alloca(strlen(path) + 1);
179 while ((p = strsep(&cur, ":")) != NULL) {
181 * It's a SHELL path -- double, leading and trailing colons
182 * mean the current directory.
192 * If the path is too long complain. This is a possible
193 * security issue; given a way to make the path too long
194 * the user may execute the wrong program.
196 if (lp + ln + 2 > sizeof(buf)) {
197 _write(STDERR_FILENO, "execvP: ", 8);
198 _write(STDERR_FILENO, p, lp);
199 _write(STDERR_FILENO, ": path too long\n", 16);
204 bcopy(name, buf + lp + 1, ln);
205 buf[lp + ln + 1] = '\0';
207 _execve(bp, argv, environ);
216 for (cnt = 0; argv[cnt]; ++cnt)
218 memp = alloca((cnt + 2) * sizeof(char *));
220 /* errno = ENOMEM; XXX override ENOEXEC? */
225 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
226 _execve(_PATH_BSHELL, __DECONST(char **, memp), environ);
234 * We used to retry here, but sh(1) doesn't.
239 * EACCES may be for an inaccessible directory or
240 * a non-executable file. Call stat() to decide
241 * which. This also handles ambiguities for EFAULT
242 * and EIO, and undocumented errors like ESTALE.
243 * We hope that the race for a stat() is unimportant.
246 if (stat(bp, &sb) != 0)
248 if (save_errno == EACCES) {
265 execvP(const char *name, const char *path, char * const argv[])
267 return execvPe(name, path, argv, environ);
271 _execvpe(const char *name, char * const argv[], char * const envp[])
275 /* Get the path we're searching. */
276 if ((path = getenv("PATH")) == NULL)
277 path = _PATH_DEFPATH;
279 return (execvPe(name, path, argv, envp));