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 #if defined(LIBC_SCCS) && !defined(lint)
33 static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93";
34 #endif /* LIBC_SCCS and not lint */
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
38 #include "namespace.h"
39 #include <sys/param.h>
49 #include "un-namespace.h"
50 #include "libc_private.h"
52 extern char **environ;
55 execl(const char *name, const char *arg, ...)
63 while (va_arg(ap, char *) != NULL)
66 argv = alloca((n + 1) * sizeof(*argv));
74 while ((argv[n] = va_arg(ap, char *)) != NULL)
77 return (_execve(name, __DECONST(char **, argv), environ));
81 execle(const char *name, const char *arg, ...)
90 while (va_arg(ap, char *) != NULL)
93 argv = alloca((n + 1) * sizeof(*argv));
101 while ((argv[n] = va_arg(ap, char *)) != NULL)
103 envp = va_arg(ap, char **);
105 return (_execve(name, __DECONST(char **, argv), envp));
109 execlp(const char *name, const char *arg, ...)
117 while (va_arg(ap, char *) != NULL)
120 argv = alloca((n + 1) * sizeof(*argv));
128 while ((argv[n] = va_arg(ap, char *)) != NULL)
131 return (execvp(name, __DECONST(char **, argv)));
135 execv(const char *name, char * const *argv)
137 (void)_execve(name, argv, environ);
142 execvp(const char *name, char * const *argv)
144 return (_execvpe(name, argv, environ));
148 execvPe(const char *name, const char *path, char * const *argv,
153 int eacces, save_errno;
154 char *cur, buf[MAXPATHLEN];
160 /* If it's an absolute or relative path name, it's easy. */
161 if (strchr(name, '/')) {
168 /* If it's an empty path name, fail in the usual POSIX way. */
174 cur = alloca(strlen(path) + 1);
180 while ((p = strsep(&cur, ":")) != NULL) {
182 * It's a SHELL path -- double, leading and trailing colons
183 * mean the current directory.
193 * If the path is too long complain. This is a possible
194 * security issue; given a way to make the path too long
195 * the user may execute the wrong program.
197 if (lp + ln + 2 > sizeof(buf)) {
198 (void)_write(STDERR_FILENO, "execvP: ", 8);
199 (void)_write(STDERR_FILENO, p, lp);
200 (void)_write(STDERR_FILENO, ": path too long\n",
206 bcopy(name, buf + lp + 1, ln);
207 buf[lp + ln + 1] = '\0';
209 retry: (void)_execve(bp, argv, envp);
218 for (cnt = 0; argv[cnt]; ++cnt)
220 memp = alloca((cnt + 2) * sizeof(char *));
222 /* errno = ENOMEM; XXX override ENOEXEC? */
227 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
228 (void)_execve(_PATH_BSHELL,
229 __DECONST(char **, memp), envp);
237 * We used to retry here, but sh(1) doesn't.
242 * EACCES may be for an inaccessible directory or
243 * a non-executable file. Call stat() to decide
244 * which. This also handles ambiguities for EFAULT
245 * and EIO, and undocumented errors like ESTALE.
246 * We hope that the race for a stat() is unimportant.
249 if (stat(bp, &sb) != 0)
251 if (save_errno == EACCES) {
268 execvP(const char *name, const char *path, char * const argv[])
270 return execvPe(name, path, argv, environ);
274 _execvpe(const char *name, char * const argv[], char * const envp[])
278 /* Get the path we're searching. */
279 if ((path = getenv("PATH")) == NULL)
280 path = _PATH_DEFPATH;
282 return (execvPe(name, path, argv, envp));