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Add helper to spawn process with stdin connected to a pipe

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Mike Gilbert 2018-06-13 13:49:42 -05:00 committed by William Hubbs
parent e4ddfa38e0
commit ec8abea460
3 changed files with 77 additions and 2 deletions
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4
src/rc/Makefile
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@ -5,8 +5,8 @@ include ${MK}/os.mk
SRCS= checkpath.c do_e.c do_mark_service.c do_service.c \
do_value.c fstabinfo.c is_newer_than.c is_older_than.c \
mountinfo.c openrc-run.c rc-abort.c rc.c \
rc-depend.c rc-logger.c rc-misc.c rc-plugin.c \
rc-service.c rc-status.c rc-update.c \
rc-depend.c rc-logger.c rc-misc.c rc-pipes.c \
rc-plugin.c rc-service.c rc-status.c rc-update.c \
shell_var.c start-stop-daemon.c supervise-daemon.c swclock.c _usage.c
ifeq (${MKSELINUX},yes)

57
src/rc/rc-pipes.c Normal file
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@ -0,0 +1,57 @@
/*
* 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-pipe-command.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);
}
}

18
src/rc/rc-pipes.h Normal file
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@ -0,0 +1,18 @@
/*
* 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.
*/
#ifndef RC_PIPES_H
#define RC_PIPES_H
int rc_pipe_command(char *cmd);
#endif