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/*
* rc-pipes.c
* Helper to handle spawning processes and connecting them to pipes.
*/
/*
* Copyright (c) 2018 The OpenRC Authors.
* See the Authors file at the top-level directory of this distribution and
* https://github.com/OpenRC/openrc/blob/master/AUTHORS
*
* This file is part of OpenRC. It is subject to the license terms in
* the LICENSE file found in the top-level directory of this
* distribution and at https://github.com/OpenRC/openrc/blob/master/LICENSE
* This file may not be copied, modified, propagated, or distributed
* except according to the terms contained in the LICENSE file.
*/
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include "rc-pipes.h"
static const int pipe_read_end = 0;
static const int pipe_write_end = 1;
/*
* Starts a command with stdin redirected from a pipe
* Returns the write end of the pipe or -1
*/
int rc_pipe_command(char *cmd)
{
int pfd[2];
pid_t pid;
if (pipe(pfd) < 0)
return -1;
pid = fork();
if (pid < 0)
return -1;
else if (pid > 0) {
/* parent */
close(pfd[0]);
return pfd[pipe_write_end];
} else if (pid == 0) {
/* child */
close(pfd[pipe_write_end]);
if (pfd[0] != STDIN_FILENO) {
if (dup2(pfd[0], STDIN_FILENO) < 0)
exit(1);
close(pfd[0]);
}
execl("/bin/sh", "sh", "-c", cmd, NULL);
exit(1);
}
}
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