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/*
* ========================
* ===== ===============
* ====== ================
* ====== ================
* ====== ==== ==== ==
* ====== === == = =
* ====== === = == =
* = === === = == ====
* = === === = == = =
* == ===== ==== ==
* ========================
*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 2020 Joe
* 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. Neither the name of the organization 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 JOE ''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 JOE 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.
*
* bsdsetsid: src/c_fork.c
* Thu Nov 26 22:12:40 CET 2020
* Joe
*
* The program's main fork(2).
*/
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "c_bsdsetsid.h"
void
c_fork
(const char* argv[],
const char* envp[],
bool_t wopt)
{
int sets_ret;
int exec_ret;
pid_t pid;
pid = fork();
if (pid == -1) {
dprintf(
STDERR_FILENO,
"%s: fork: %s\n",
C_PROGNAME,
strerror(errno)
);
exit(EXIT_FAILURE);
}
else if (pid == 0) {
sets_ret = setsid();
if (sets_ret == -1) {
dprintf(
STDERR_FILENO,
"%s: setsid: %s\n",
C_PROGNAME,
strerror(errno)
);
exit(EXIT_FAILURE);
}
exec_ret = execve(
argv[1 + wopt],
(char* const*)argv + (1 + wopt),
(char* const*)envp
);
if (exec_ret == -1) {
dprintf(
STDERR_FILENO,
"%s: execve: %s\n",
C_PROGNAME,
strerror(errno)
);
exit(EXIT_FAILURE);
}
}
else {
exit(EXIT_SUCCESS);
}
}
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