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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * $FreeBSD: src/lib/libc/gen/exec.c,v 1.15 2000/01/27 23:06:14 jasone Exp $
34 * $DragonFly: src/lib/libc/gen/exec.c,v 1.6 2005/04/26 18:51:44 joerg Exp $
36 * @(#)exec.c 8.1 (Berkeley) 6/4/93
37 * $FreeBSD: src/lib/libc/gen/exec.c,v 1.15 2000/01/27 23:06:14 jasone Exp $
40 #include "namespace.h"
41 #include <sys/param.h>
42 #include <sys/types.h>
50 #include "un-namespace.h"
54 extern char **environ;
57 execl(const char *name, const char *arg, ...)
65 while (va_arg(ap, char *) != NULL)
68 argv = alloca((n + 1) * sizeof(*argv));
76 while ((argv[n] = va_arg(ap, const char *)) != NULL)
79 return (_execve(name, __DECONST(char **, argv),
80 __DECONST(char **, environ)));
84 execle(const char *name, const char *arg, ...)
87 const char **argv, **envp;
92 while (va_arg(ap, char *) != NULL)
95 argv = alloca((n + 1) * sizeof(*argv));
103 while ((argv[n] = va_arg(ap, const char *)) != NULL)
105 envp = va_arg(ap, const char **);
107 return (_execve(name, __DECONST(char **, argv),
108 __DECONST(char **, envp)));
112 execlp(const char *name, const char *arg, ...)
120 while (va_arg(ap, char *) != NULL)
123 argv = alloca((n + 1) * sizeof(*argv));
131 while ((argv[n] = va_arg(ap, const char *)) != NULL)
134 return (execvp(name, __DECONST(char **, argv)));
142 (void)_execve(name, argv, environ);
154 int eacces, save_errno;
155 const char *bp, *p, *path;
156 char *cur, buf[MAXPATHLEN];
161 /* If it's an absolute or relative path name, it's easy. */
162 if (index(name, '/')) {
170 /* If it's an empty path name, fail in the usual POSIX way. */
176 /* Get the path we're searching. */
177 if (!(path = getenv("PATH")))
178 path = _PATH_DEFPATH;
179 cur = alloca(strlen(path) + 1);
186 while ( (p = strsep(&cur, ":")) ) {
188 * It's a SHELL path -- double, leading and trailing colons
189 * mean the current directory.
199 * If the path is too long complain. This is a possible
200 * security issue; given a way to make the path too long
201 * the user may execute the wrong program.
203 if (lp + ln + 2 > sizeof(buf)) {
204 (void)_write(STDERR_FILENO, "execvp: ", 8);
205 (void)_write(STDERR_FILENO, p, lp);
206 (void)_write(STDERR_FILENO, ": path too long\n",
212 bcopy(name, buf + lp + 1, ln);
213 buf[lp + ln + 1] = '\0';
215 retry: (void)_execve(bp, argv, environ);
224 for (cnt = 0; argv[cnt]; ++cnt)
226 memp = alloca((cnt + 2) * sizeof(char *));
228 /* errno = ENOMEM; XXX override ENOEXEC? */
233 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
234 _execve(_PATH_BSHELL, __DECONST(char **, memp), environ);
242 * We used to retry here, but sh(1) doesn't.
247 * EACCES may be for an inaccessible directory or
248 * a non-executable file. Call stat() to decide
249 * which. This also handles ambiguities for EFAULT
250 * and EIO, and undocumented errors like ESTALE.
251 * We hope that the race for a stat() is unimportant.
254 if (stat(bp, &sb) != 0)
256 if (save_errno == EACCES) {