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"
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));
71 argv[0] = (char *)arg;
72 while ((argv[n] = va_arg(ap, char *)) != NULL)
75 return (_execve(name, argv, environ));
79 execle(const char *name, const char *arg, ...)
87 while (va_arg(ap, char *) != NULL)
90 argv = alloca((n + 1) * sizeof(*argv));
97 argv[0] = (char *)arg;
98 while ((argv[n] = va_arg(ap, char *)) != NULL)
100 envp = va_arg(ap, char **);
102 return (_execve(name, argv, envp));
106 execlp(const char *name, const char *arg, ...)
114 while (va_arg(ap, char *) != NULL)
117 argv = alloca((n + 1) * sizeof(*argv));
124 argv[0] = (char *)arg;
125 while ((argv[n] = va_arg(ap, char *)) != NULL)
128 return (execvp(name, argv));
136 (void)_execve(name, argv, environ);
141 execvp(const char *name, char * const *argv)
145 /* Get the path we're searching. */
146 if ((path = getenv("PATH")) == NULL)
147 path = _PATH_DEFPATH;
149 return (execvP(name, path, argv));
153 execvP(name, path, argv)
161 int eacces, save_errno;
162 char *bp, *cur, buf[MAXPATHLEN];
167 /* If it's an absolute or relative path name, it's easy. */
168 if (index(name, '/')) {
175 /* If it's an empty path name, fail in the usual POSIX way. */
181 cur = alloca(strlen(path) + 1);
187 while ((p = strsep(&cur, ":")) != NULL) {
189 * It's a SHELL path -- double, leading and trailing colons
190 * mean the current directory.
200 * If the path is too long complain. This is a possible
201 * security issue; given a way to make the path too long
202 * the user may execute the wrong program.
204 if (lp + ln + 2 > sizeof(buf)) {
205 (void)_write(STDERR_FILENO, "execvP: ", 8);
206 (void)_write(STDERR_FILENO, p, lp);
207 (void)_write(STDERR_FILENO, ": path too long\n",
213 bcopy(name, buf + lp + 1, ln);
214 buf[lp + ln + 1] = '\0';
216 retry: (void)_execve(bp, argv, environ);
225 for (cnt = 0; argv[cnt]; ++cnt)
227 memp = alloca((cnt + 2) * sizeof(char *));
229 /* errno = ENOMEM; XXX override ENOEXEC? */
234 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
235 (void)_execve(_PATH_BSHELL, memp, environ);
243 * We used to retry here, but sh(1) doesn't.
248 * EACCES may be for an inaccessible directory or
249 * a non-executable file. Call stat() to decide
250 * which. This also handles ambiguities for EFAULT
251 * and EIO, and undocumented errors like ESTALE.
252 * We hope that the race for a stat() is unimportant.
255 if (stat(bp, &sb) != 0)
257 if (save_errno == EACCES) {