/*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) && !defined(lint) static char sccsid[] = "@(#)exec.c 8.1 (Berkeley) 6/4/93"; #endif /* LIBC_SCCS and not lint */ #include __FBSDID("$FreeBSD: src/lib/libc/gen/exec.c,v 1.22 2003/07/01 12:30:03 bde Exp $"); #include "namespace.h" #include #include #include #include #include #include #include #include #include #include #include "un-namespace.h" #include #define environ (*_NSGetEnviron()) int execl(const char *name, const char *arg, ...) { va_list ap; char **argv; int n; va_start(ap, arg); n = 1; while (va_arg(ap, char *) != NULL) n++; va_end(ap); argv = alloca((n + 1) * sizeof(*argv)); if (argv == NULL) { errno = ENOMEM; return (-1); } va_start(ap, arg); n = 1; argv[0] = (char *)arg; while ((argv[n] = va_arg(ap, char *)) != NULL) n++; va_end(ap); return (_execve(name, argv, environ)); } int execle(const char *name, const char *arg, ...) { va_list ap; char **argv, **envp; int n; va_start(ap, arg); n = 1; while (va_arg(ap, char *) != NULL) n++; va_end(ap); argv = alloca((n + 1) * sizeof(*argv)); if (argv == NULL) { errno = ENOMEM; return (-1); } va_start(ap, arg); n = 1; argv[0] = (char *)arg; while ((argv[n] = va_arg(ap, char *)) != NULL) n++; envp = va_arg(ap, char **); va_end(ap); return (_execve(name, argv, envp)); } int execlp(const char *name, const char *arg, ...) { va_list ap; char **argv; int n; va_start(ap, arg); n = 1; while (va_arg(ap, char *) != NULL) n++; va_end(ap); argv = alloca((n + 1) * sizeof(*argv)); if (argv == NULL) { errno = ENOMEM; return (-1); } va_start(ap, arg); n = 1; argv[0] = (char *)arg; while ((argv[n] = va_arg(ap, char *)) != NULL) n++; va_end(ap); return (execvp(name, argv)); } int execv(name, argv) const char *name; char * const *argv; { (void)_execve(name, argv, environ); return (-1); } int execvp(const char *name, char * const *argv) { const char *path; /* Get the path we're searching. */ if ((path = getenv("PATH")) == NULL) path = _PATH_DEFPATH; return (execvP(name, path, argv)); } int execvP(name, path, argv) const char *name; const char *path; char * const *argv; { char **memp; int cnt, lp, ln; char *p; int eacces, save_errno; char *bp, *cur, buf[MAXPATHLEN]; struct stat sb; eacces = 0; /* If it's an absolute or relative path name, it's easy. */ if (index(name, '/')) { bp = (char *)name; cur = NULL; goto retry; } bp = buf; /* If it's an empty path name, fail in the usual POSIX way. */ if (*name == '\0') { errno = ENOENT; return (-1); } cur = alloca(strlen(path) + 1); if (cur == NULL) { errno = ENOMEM; return (-1); } strcpy(cur, path); while ((p = strsep(&cur, ":")) != NULL) { /* * It's a SHELL path -- double, leading and trailing colons * mean the current directory. */ if (*p == '\0') { p = "."; lp = 1; } else lp = strlen(p); ln = strlen(name); /* * If the path is too long complain. This is a possible * security issue; given a way to make the path too long * the user may execute the wrong program. */ if (lp + ln + 2 > sizeof(buf)) { (void)_write(STDERR_FILENO, "execvP: ", 8); (void)_write(STDERR_FILENO, p, lp); (void)_write(STDERR_FILENO, ": path too long\n", 16); continue; } bcopy(p, buf, lp); buf[lp] = '/'; bcopy(name, buf + lp + 1, ln); buf[lp + ln + 1] = '\0'; retry: (void)_execve(bp, argv, environ); switch (errno) { case E2BIG: goto done; case ELOOP: case ENAMETOOLONG: case ENOENT: break; case ENOEXEC: for (cnt = 0; argv[cnt]; ++cnt) ; memp = alloca((cnt + 2) * sizeof(char *)); if (memp == NULL) { /* errno = ENOMEM; XXX override ENOEXEC? */ goto done; } memp[0] = "sh"; memp[1] = bp; bcopy(argv + 1, memp + 2, cnt * sizeof(char *)); (void)_execve(_PATH_BSHELL, memp, environ); goto done; case ENOMEM: goto done; case ENOTDIR: break; case ETXTBSY: /* * We used to retry here, but sh(1) doesn't. */ goto done; default: /* * EACCES may be for an inaccessible directory or * a non-executable file. Call stat() to decide * which. This also handles ambiguities for EFAULT * and EIO, and undocumented errors like ESTALE. * We hope that the race for a stat() is unimportant. */ save_errno = errno; if (stat(bp, &sb) != 0) break; if (save_errno == EACCES) { eacces = 1; continue; } errno = save_errno; goto done; } } if (eacces) errno = EACCES; else if (cur) errno = ENOENT; /* else use existing errno from _execve */ done: return (-1); }