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 * 3. 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 $
33 #include "namespace.h"
34 #include <sys/param.h>
35 #include <sys/types.h>
45 #include "un-namespace.h"
46 #include "libc_private.h"
48 extern char **environ;
51 execl(const char *name, const char *arg, ...)
59 while (va_arg(ap, char *) != NULL)
62 argv = alloca((n + 1) * sizeof(*argv));
70 while ((argv[n] = va_arg(ap, const char *)) != NULL)
73 return (_execve(name, __DECONST(char **, argv),
74 __DECONST(char **, environ)));
78 execle(const char *name, const char *arg, ...)
81 const char **argv, **envp;
86 while (va_arg(ap, char *) != NULL)
89 argv = alloca((n + 1) * sizeof(*argv));
97 while ((argv[n] = va_arg(ap, const char *)) != NULL)
99 envp = va_arg(ap, const char **);
101 return (_execve(name, __DECONST(char **, argv),
102 __DECONST(char **, envp)));
106 execlp(const char *name, const char *arg, ...)
114 while (va_arg(ap, char *) != NULL)
117 argv = alloca((n + 1) * sizeof(*argv));
125 while ((argv[n] = va_arg(ap, const char *)) != NULL)
128 return (execvp(name, __DECONST(char **, argv)));
132 execv(const char *name, char * const *argv)
134 _execve(name, argv, environ);
139 execvp(const char *name, char * const *argv)
141 return (_execvpe(name, argv, environ));
145 execvPe(const char *name, const char *path, char * const *argv,
146 char * const *envp __unused)
151 int eacces, save_errno;
153 char *cur, buf[MAXPATHLEN];
158 /* If it's an absolute or relative path name, it's easy. */
159 if (index(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 _write(STDERR_FILENO, "execvP: ", 8);
197 _write(STDERR_FILENO, p, lp);
198 _write(STDERR_FILENO, ": path too long\n", 16);
203 bcopy(name, buf + lp + 1, ln);
204 buf[lp + ln + 1] = '\0';
206 _execve(bp, argv, environ);
215 for (cnt = 0; argv[cnt]; ++cnt)
217 memp = alloca((cnt + 2) * sizeof(char *));
219 /* errno = ENOMEM; XXX override ENOEXEC? */
224 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
225 _execve(_PATH_BSHELL, __DECONST(char **, memp), environ);
233 * We used to retry here, but sh(1) doesn't.
238 * EACCES may be for an inaccessible directory or
239 * a non-executable file. Call stat() to decide
240 * which. This also handles ambiguities for EFAULT
241 * and EIO, and undocumented errors like ESTALE.
242 * We hope that the race for a stat() is unimportant.
245 if (stat(bp, &sb) != 0)
247 if (save_errno == EACCES) {
264 execvP(const char *name, const char *path, char * const argv[])
266 return execvPe(name, path, argv, environ);
270 _execvpe(const char *name, char * const argv[], char * const envp[])
274 /* Get the path we're searching. */
275 if ((path = getenv("PATH")) == NULL)
276 path = _PATH_DEFPATH;
278 return (execvPe(name, path, argv, envp));