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
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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 1.7 2005/11/13 00:07:42 swildner 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)));
138 execv(const char *name, char * const *argv)
140 _execve(name, argv, environ);
145 execvp(const char *name, char * const *argv)
150 int eacces, save_errno;
151 const char *bp, *p, *path;
152 char *cur, buf[MAXPATHLEN];
157 /* If it's an absolute or relative path name, it's easy. */
158 if (index(name, '/')) {
166 /* If it's an empty path name, fail in the usual POSIX way. */
172 /* Get the path we're searching. */
173 if (!(path = getenv("PATH")))
174 path = _PATH_DEFPATH;
175 cur = alloca(strlen(path) + 1);
182 while ( (p = strsep(&cur, ":")) ) {
184 * It's a SHELL path -- double, leading and trailing colons
185 * mean the current directory.
195 * If the path is too long complain. This is a possible
196 * security issue; given a way to make the path too long
197 * the user may execute the wrong program.
199 if (lp + ln + 2 > sizeof(buf)) {
200 _write(STDERR_FILENO, "execvp: ", 8);
201 _write(STDERR_FILENO, p, lp);
202 _write(STDERR_FILENO, ": path too long\n", 16);
207 bcopy(name, buf + lp + 1, ln);
208 buf[lp + ln + 1] = '\0';
210 retry: _execve(bp, argv, environ);
219 for (cnt = 0; argv[cnt]; ++cnt)
221 memp = alloca((cnt + 2) * sizeof(char *));
223 /* errno = ENOMEM; XXX override ENOEXEC? */
228 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
229 _execve(_PATH_BSHELL, __DECONST(char **, memp), environ);
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) {