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32 #include "namespace.h"
33 #include <sys/param.h>
43 #include "un-namespace.h"
44 #include "libc_private.h"
46 static const char execvPe_err_preamble[] = "execvP: ";
47 static const char execvPe_err_trailer[] = ": path too long\n";
50 execl(const char *name, const char *arg, ...)
58 while (va_arg(ap, char *) != NULL)
61 argv = alloca((n + 1) * sizeof(*argv));
69 while ((argv[n] = va_arg(ap, char *)) != NULL)
72 return (_execve(name, __DECONST(char **, argv), environ));
76 execle(const char *name, const char *arg, ...)
85 while (va_arg(ap, char *) != NULL)
88 argv = alloca((n + 1) * sizeof(*argv));
96 while ((argv[n] = va_arg(ap, char *)) != NULL)
98 envp = va_arg(ap, char **);
100 return (_execve(name, __DECONST(char **, argv), envp));
104 execlp(const char *name, const char *arg, ...)
112 while (va_arg(ap, char *) != NULL)
115 argv = alloca((n + 1) * sizeof(*argv));
123 while ((argv[n] = va_arg(ap, char *)) != NULL)
126 return (execvp(name, __DECONST(char **, argv)));
130 execv(const char *name, char * const *argv)
132 (void)_execve(name, argv, environ);
137 execvp(const char *name, char * const *argv)
139 return (_execvpe(name, argv, environ));
143 execvPe(const char *name, const char *path, char * const *argv,
148 int eacces, save_errno;
149 char buf[MAXPATHLEN];
150 const char *bp, *np, *op, *p;
155 /* If it's an absolute or relative path name, it's easy. */
156 if (strchr(name, '/')) {
163 /* If it's an empty path name, fail in the usual POSIX way. */
172 np = strchrnul(op, ':');
175 * It's a SHELL path -- double, leading and trailing colons
176 * mean the current directory.
179 /* Empty component. */
183 /* Non-empty component. */
188 /* Advance to the next component or terminate after this. */
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 (void)_write(STDERR_FILENO, execvPe_err_preamble,
201 sizeof(execvPe_err_preamble) - 1);
202 (void)_write(STDERR_FILENO, p, lp);
203 (void)_write(STDERR_FILENO, execvPe_err_trailer,
204 sizeof(execvPe_err_trailer) - 1);
209 bcopy(name, buf + lp + 1, ln);
210 buf[lp + ln + 1] = '\0';
212 retry: (void)_execve(bp, argv, envp);
221 for (cnt = 0; argv[cnt]; ++cnt)
225 * cnt may be 0 above; always allocate at least
226 * 3 entries so that we can at least fit "sh", bp, and
227 * the NULL terminator. We can rely on cnt to take into
228 * account the NULL terminator in all other scenarios,
229 * as we drop argv[0].
231 memp = alloca(MAX(3, cnt + 2) * sizeof(char *));
233 /* errno = ENOMEM; XXX override ENOEXEC? */
239 bcopy(argv + 1, memp + 2, cnt * sizeof(char *));
245 (void)_execve(_PATH_BSHELL,
246 __DECONST(char **, memp), envp);
254 * We used to retry here, but sh(1) doesn't.
259 * EACCES may be for an inaccessible directory or
260 * a non-executable file. Call stat() to decide
261 * which. This also handles ambiguities for EFAULT
262 * and EIO, and undocumented errors like ESTALE.
263 * We hope that the race for a stat() is unimportant.
266 if (stat(bp, &sb) != 0)
268 if (save_errno == EACCES) {
285 execvP(const char *name, const char *path, char * const argv[])
287 return execvPe(name, path, argv, environ);
291 _execvpe(const char *name, char * const argv[], char * const envp[])
295 /* Get the path we're searching. */
296 if ((path = getenv("PATH")) == NULL)
297 path = _PATH_DEFPATH;
299 return (execvPe(name, path, argv, envp));