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
30 #if defined(LIBC_SCCS) && !defined(lint)
31 static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93";
32 #endif /* LIBC_SCCS and not lint */
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include "namespace.h"
37 #include <sys/param.h>
38 #include <sys/types.h>
48 #include "un-namespace.h"
49 #include "libc_private.h"
51 extern char **environ;
54 execl(const char *name, const char *arg, ...)
62 while (va_arg(ap, char *) != NULL)
65 argv = alloca((n + 1) * sizeof(*argv));
73 while ((argv[n] = va_arg(ap, char *)) != NULL)
76 return (_execve(name, __DECONST(char **, argv), environ));
80 execle(const char *name, const char *arg, ...)
89 while (va_arg(ap, char *) != NULL)
92 argv = alloca((n + 1) * sizeof(*argv));
100 while ((argv[n] = va_arg(ap, char *)) != NULL)
102 envp = va_arg(ap, char **);
104 return (_execve(name, __DECONST(char **, argv), envp));
108 execlp(const char *name, const char *arg, ...)
116 while (va_arg(ap, char *) != NULL)
119 argv = alloca((n + 1) * sizeof(*argv));
127 while ((argv[n] = va_arg(ap, char *)) != NULL)
130 return (execvp(name, __DECONST(char **, argv)));
134 execv(const char *name, char * const *argv)
136 (void)_execve(name, argv, environ);
141 execvp(const char *name, char * const *argv)
143 return (_execvpe(name, argv, environ));
147 execvPe(const char *name, const char *path, char * const *argv,
152 int eacces, save_errno;
153 char *cur, buf[MAXPATHLEN];
159 /* If it's an absolute or relative path name, it's easy. */
160 if (strchr(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 (void)_write(STDERR_FILENO, "execvP: ", 8);
198 (void)_write(STDERR_FILENO, p, lp);
199 (void)_write(STDERR_FILENO, ": path too long\n",
205 bcopy(name, buf + lp + 1, ln);
206 buf[lp + ln + 1] = '\0';
208 retry: (void)_execve(bp, argv, envp);
217 for (cnt = 0; argv[cnt]; ++cnt)
219 memp = alloca((cnt + 2) * sizeof(char *));
221 /* errno = ENOMEM; XXX override ENOEXEC? */
226 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
227 (void)_execve(_PATH_BSHELL,
228 __DECONST(char **, memp), envp);
236 * We used to retry here, but sh(1) doesn't.
241 * EACCES may be for an inaccessible directory or
242 * a non-executable file. Call stat() to decide
243 * which. This also handles ambiguities for EFAULT
244 * and EIO, and undocumented errors like ESTALE.
245 * We hope that the race for a stat() is unimportant.
248 if (stat(bp, &sb) != 0)
250 if (save_errno == EACCES) {
267 execvP(const char *name, const char *path, char * const argv[])
269 return execvPe(name, path, argv, environ);
273 _execvpe(const char *name, char * const argv[], char * const envp[])
277 /* Get the path we're searching. */
278 if ((path = getenv("PATH")) == NULL)
279 path = _PATH_DEFPATH;
281 return (execvPe(name, path, argv, envp));