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/* $NetBSD: fexec.c,v 1.9.8.4 2009/02/02 11:55:16 joerg Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Matthias Scheler.
*
* 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <nbcompat.h>
#if HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
#if HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
#if HAVE_ERR_H
#include <err.h>
#endif
#if HAVE_ERRNO_H
#include <errno.h>
#endif
#if HAVE_STDARG_H
#include <stdarg.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "lib.h"
__RCSID("$NetBSD: fexec.c,v 1.9.8.4 2009/02/02 11:55:16 joerg Exp $");
static int vfcexec(const char *, int, const char *, va_list);
/*
* fork, then change current working directory to path and
* execute the command and arguments in the argv array.
* wait for the command to finish, then return the exit status.
*/
int
pfcexec(const char *path, const char *file, const char **argv)
{
pid_t child;
int status;
child = vfork();
switch (child) {
case 0:
if ((path != NULL) && (chdir(path) < 0))
_exit(127);
(void)execvp(file, (char ** const)argv);
_exit(127);
/* NOTREACHED */
case -1:
return -1;
}
while (waitpid(child, &status, 0) < 0) {
if (errno != EINTR)
return -1;
}
if (!WIFEXITED(status))
return -1;
return WEXITSTATUS(status);
}
static int
vfcexec(const char *path, int skipempty, const char *arg, va_list ap)
{
const char **argv;
size_t argv_size, argc;
int retval;
argv_size = 16;
argv = xcalloc(argv_size, sizeof(*argv));
argv[0] = arg;
argc = 1;
do {
if (argc == argv_size) {
argv_size *= 2;
argv = xrealloc(argv, argv_size * sizeof(*argv));
}
arg = va_arg(ap, const char *);
if (skipempty && arg && strlen(arg) == 0)
continue;
argv[argc++] = arg;
} while (arg != NULL);
retval = pfcexec(path, argv[0], argv);
free(argv);
return retval;
}
int
fexec(const char *arg, ...)
{
va_list ap;
int result;
va_start(ap, arg);
result = vfcexec(NULL, 0, arg, ap);
va_end(ap);
return result;
}
int
fexec_skipempty(const char *arg, ...)
{
va_list ap;
int result;
va_start(ap, arg);
result = vfcexec(NULL, 1, arg, ap);
va_end(ap);
return result;
}
int
fcexec(const char *path, const char *arg, ...)
{
va_list ap;
int result;
va_start(ap, arg);
result = vfcexec(path, 0, arg, ap);
va_end(ap);
return result;
}
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