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posix_spawnp.c revision 1.3 
      1 /*	$NetBSD: posix_spawnp.c,v 1.3 2018/01/04 20:57:29 kamil Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2011 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Martin Husemann <martin (at) NetBSD.org>.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 __RCSID("$NetBSD: posix_spawnp.c,v 1.3 2018/01/04 20:57:29 kamil Exp $");
     35 #endif /* LIBC_SCCS and not lint */
     36 
     37 #include "namespace.h"
     38 
     39 #include <stdio.h>
     40 #include <string.h>
     41 #include <stdlib.h>
     42 #include <errno.h>
     43 #include <unistd.h>
     44 #include <spawn.h>
     45 
     46 
     47 int posix_spawnp(pid_t * __restrict pid, const char * __restrict file,
     48     const posix_spawn_file_actions_t *fa,
     49     const posix_spawnattr_t * __restrict sa,
     50     char * const *__restrict cav, char * const *__restrict env)
     51 {
     52 	char fpath[FILENAME_MAX], *last, *p;
     53 	char *path;
     54 
     55 	/*
     56 	 * If there is a / in the filename, or no PATH environment variable
     57 	 * set, fall straight through to posix_spawn().
     58 	 */
     59 	if (strchr(file, '/') != NULL || (path = getenv("PATH")) == NULL)
     60 		return posix_spawn(pid, file, fa, sa, cav, env);
     61 
     62 	path = strdup(path);
     63 	if (path == NULL)
     64 		return ENOMEM;
     65 
     66 	/*
     67 	 * Find an executable image with the given name in the PATH
     68 	 */
     69 	for (p = strtok_r(path, ":", &last); p;
     70 	    p = strtok_r(NULL, ":", &last)) {
     71 		snprintf(fpath, sizeof fpath, "%s/%s", p, file);
     72 		fpath[FILENAME_MAX-1] = 0;
     73 		if (access(fpath, X_OK) == 0)
     74 			break;
     75 	}
     76 	free(path);
     77 
     78 	/*
     79 	 * Use posix_spawn() with the found binary
     80 	 */
     81 	return posix_spawn(pid, fpath, fa, sa, cav, env);
     82 }
     83