/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */

/* lib/krad/t_daemon.h - Daemonization helper for RADIUS test programs */

/*

 * Copyright 2013 Red Hat, Inc.  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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER

 * 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.

 */

#ifndef T_DAEMON_H_

#define T_DAEMON_H_

#include "t_test.h"

#include <libgen.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

static pid_t daemon_pid;

static void

daemon_stop(void)

{

    if (daemon_pid == 0)

        return;

    kill(daemon_pid, SIGTERM);

    waitpid(daemon_pid, NULL, 0);

    daemon_pid = 0;

}

static krb5_boolean

daemon_start(int argc, const char **argv)

{

    int fds[2];

    char buf[1];

    if (argc != 3 || argv == NULL)

        return FALSE;

    if (daemon_pid != 0)

        return TRUE;

    if (pipe(fds) != 0)

        return FALSE;

    /* Start the child process with the write end of the pipe as stdout. */

    daemon_pid = fork();

    if (daemon_pid == 0) {

        dup2(fds[1], STDOUT_FILENO);

        close(fds[0]);

        close(fds[1]);

        exit(execlp(argv[1], argv[1], argv[2], NULL));

    }

    close(fds[1]);

    /* The child will write a sentinel character when it is listening. */

    if (read(fds[0], buf, 1) != 1 || *buf != '~')

        return FALSE;

    close(fds[0]);

    atexit(daemon_stop);

    return TRUE;

}

#endif /* T_DAEMON_H_ */