2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1991, 1993
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32 #include <sys/cdefs.h>
33 __SCCSID("@(#)exec.c 8.1 (Berkeley) 6/4/93");
34 __FBSDID("$FreeBSD$");
36 #include "namespace.h"
37 #include <sys/param.h>
47 #include "un-namespace.h"
48 #include "libc_private.h"
50 static const char execvPe_err_preamble[] = "execvP: ";
51 static const char execvPe_err_trailer[] = ": path too long\n";
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 buf[MAXPATHLEN];
154 const char *bp, *np, *op, *p;
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. */
176 np = strchrnul(op, ':');
179 * It's a SHELL path -- double, leading and trailing colons
180 * mean the current directory.
183 /* Empty component. */
187 /* Non-empty component. */
192 /* Advance to the next component or terminate after this. */
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, execvPe_err_preamble,
205 sizeof(execvPe_err_preamble) - 1);
206 (void)_write(STDERR_FILENO, p, lp);
207 (void)_write(STDERR_FILENO, execvPe_err_trailer,
208 sizeof(execvPe_err_trailer) - 1);
213 bcopy(name, buf + lp + 1, ln);
214 buf[lp + ln + 1] = '\0';
216 retry: (void)_execve(bp, argv, envp);
225 for (cnt = 0; argv[cnt]; ++cnt)
229 * cnt may be 0 above; always allocate at least
230 * 3 entries so that we can at least fit "sh", bp, and
231 * the NULL terminator. We can rely on cnt to take into
232 * account the NULL terminator in all other scenarios,
233 * as we drop argv[0].
235 memp = alloca(MAX(3, cnt + 2) * sizeof(char *));
237 /* errno = ENOMEM; XXX override ENOEXEC? */
243 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
249 (void)_execve(_PATH_BSHELL,
250 __DECONST(char **, memp), envp);
258 * We used to retry here, but sh(1) doesn't.
263 * EACCES may be for an inaccessible directory or
264 * a non-executable file. Call stat() to decide
265 * which. This also handles ambiguities for EFAULT
266 * and EIO, and undocumented errors like ESTALE.
267 * We hope that the race for a stat() is unimportant.
270 if (stat(bp, &sb) != 0)
272 if (save_errno == EACCES) {
289 execvP(const char *name, const char *path, char * const argv[])
291 return execvPe(name, path, argv, environ);
295 _execvpe(const char *name, char * const argv[], char * const envp[])
299 /* Get the path we're searching. */
300 if ((path = getenv("PATH")) == NULL)
301 path = _PATH_DEFPATH;
303 return (execvPe(name, path, argv, envp));