-/*-
- * Copyright (c) 1990, 1993
- * The Regents of the University of California. All rights reserved.
- * Copyright (c) 2010
- * Stewart Smith
- *
- * 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 University 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 THE REGENTS 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 REGENTS 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.
- */
-
-#include <fcntl.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <signal.h>
-#include <unistd.h>
-#include <sys/select.h>
-
-#include <ccan/daemon-with-notify/daemon-with-notify.h>
-
-void sigusr1_handler(int sig);
-
-pid_t parent_pid;
-
-void sigusr1_handler(int sig)
-{
- if (sig == SIGUSR1)
- _exit(EXIT_SUCCESS);
-}
-
-int daemon_is_ready(void)
-{
- kill(parent_pid, SIGUSR1);
- return 0;
-}
-
-int daemonize(int nochdir, int noclose, int wait_sigusr1)
-{
- int fd;
- pid_t child= -1;
-
- parent_pid= getpid();
- signal(SIGUSR1, sigusr1_handler);
-
- child= fork();
-
- switch (child)
- {
- case -1:
- return (-1);
- case 0:
- break;
- default:
- if (wait_sigusr1)
- {
- /* parent */
- int exit_code= -1;
- int status;
- while (waitpid(child, &status, 0) != child);
- if (WIFEXITED(status))
- {
- exit_code= WEXITSTATUS(status);
- }
- if (WIFSIGNALED(status))
- {
- exit_code= -1;
- }
- _exit(exit_code);
- }
- else
- {
- _exit(EXIT_SUCCESS);
- }
- }
-
- /* child */
- if (setsid() == -1)
- return (-1);
-
- if (nochdir == 0) {
- if(chdir("/") != 0) {
- perror("chdir");
- return (-1);
- }
- }
-
- if (noclose == 0 && (fd = open("/dev/null", O_RDWR, 0)) != -1) {
- if(dup2(fd, STDIN_FILENO) < 0) {
- perror("dup2 stdin");
- return (-1);
- }
- if(dup2(fd, STDOUT_FILENO) < 0) {
- perror("dup2 stdout");
- return (-1);
- }
- if(dup2(fd, STDERR_FILENO) < 0) {
- perror("dup2 stderr");
- return (-1);
- }
-
- if (fd > STDERR_FILENO) {
- if(close(fd) < 0) {
- perror("close");
- return (-1);
- }
- }
- }
- return (0);
-}