2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1991, 1993
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __SCCSID("@(#)exec.c 8.1 (Berkeley) 6/4/93");
34 __FBSDID("$FreeBSD$");
36 #include "namespace.h"
37 #include <sys/param.h>
47 #include "un-namespace.h"
48 #include "libc_private.h"
50 extern char **environ;
53 execl(const char *name, const char *arg, ...)
61 while (va_arg(ap, char *) != NULL)
64 argv = alloca((n + 1) * sizeof(*argv));
72 while ((argv[n] = va_arg(ap, char *)) != NULL)
75 return (_execve(name, __DECONST(char **, argv), environ));
79 execle(const char *name, const char *arg, ...)
88 while (va_arg(ap, char *) != NULL)
91 argv = alloca((n + 1) * sizeof(*argv));
99 while ((argv[n] = va_arg(ap, char *)) != NULL)
101 envp = va_arg(ap, char **);
103 return (_execve(name, __DECONST(char **, argv), 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, char *)) != NULL)
129 return (execvp(name, __DECONST(char **, argv)));
133 execv(const char *name, char * const *argv)
135 (void)_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,
151 int eacces, save_errno;
152 char *cur, buf[MAXPATHLEN];
158 /* If it's an absolute or relative path name, it's easy. */
159 if (strchr(name, '/')) {
166 /* If it's an empty path name, fail in the usual POSIX way. */
172 cur = alloca(strlen(path) + 1);
178 while ((p = strsep(&cur, ":")) != NULL) {
180 * It's a SHELL path -- double, leading and trailing colons
181 * mean the current directory.
191 * If the path is too long complain. This is a possible
192 * security issue; given a way to make the path too long
193 * the user may execute the wrong program.
195 if (lp + ln + 2 > sizeof(buf)) {
196 (void)_write(STDERR_FILENO, "execvP: ", 8);
197 (void)_write(STDERR_FILENO, p, lp);
198 (void)_write(STDERR_FILENO, ": path too long\n",
204 bcopy(name, buf + lp + 1, ln);
205 buf[lp + ln + 1] = '\0';
207 retry: (void)_execve(bp, argv, envp);
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 (void)_execve(_PATH_BSHELL,
227 __DECONST(char **, memp), envp);
235 * We used to retry here, but sh(1) doesn't.
240 * EACCES may be for an inaccessible directory or
241 * a non-executable file. Call stat() to decide
242 * which. This also handles ambiguities for EFAULT
243 * and EIO, and undocumented errors like ESTALE.
244 * We hope that the race for a stat() is unimportant.
247 if (stat(bp, &sb) != 0)
249 if (save_errno == EACCES) {
266 execvP(const char *name, const char *path, char * const argv[])
268 return execvPe(name, path, argv, environ);
272 _execvpe(const char *name, char * const argv[], char * const envp[])
276 /* Get the path we're searching. */
277 if ((path = getenv("PATH")) == NULL)
278 path = _PATH_DEFPATH;
280 return (execvPe(name, path, argv, envp));