minix/lib/libc/gen/posix_spawnp.c

82 lines
2.8 KiB
C
Raw Normal View History

/* $NetBSD: posix_spawnp.c,v 1.2 2012/02/22 17:51:01 martin Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Martin Husemann <martin@NetBSD.org>.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
__RCSID("$NetBSD: posix_spawnp.c,v 1.2 2012/02/22 17:51:01 martin Exp $");
#endif /* LIBC_SCCS and not lint */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <spawn.h>
int posix_spawnp(pid_t * __restrict pid, const char * __restrict file,
const posix_spawn_file_actions_t *fa,
const posix_spawnattr_t * __restrict sa,
char * const *__restrict cav, char * const *__restrict env)
{
char fpath[FILENAME_MAX], *last, *p;
char *path;
/*
* If there is a / in the filename, or no PATH environment variable
* set, fall straight through to posix_spawn().
*/
if (strchr(file, '/') != NULL || (path = getenv("PATH")) == NULL)
return posix_spawn(pid, file, fa, sa, cav, env);
path = strdup(path);
if (path == NULL)
return ENOMEM;
/*
* Find an executable image with the given name in the PATH
*/
for (p = strtok_r(path, ":", &last); p;
p = strtok_r(NULL, ":", &last)) {
snprintf(fpath, sizeof fpath, "%s/%s", p, file);
fpath[FILENAME_MAX-1] = 0;
if (access(fpath, X_OK) == 0)
break;
}
free(path);
/*
* Use posix_spawn() with the found binary
*/
return posix_spawn(pid, fpath, fa, sa, cav, env);
}