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/* $Header: /cvsroot/wikipedia/willow/src/bin/willow/daemon.c,v 1.1 2005/05/02 19:15:21 kateturner Exp $ */
/* $NetBSD: daemon.c,v 1.9 2003/08/07 16:42:46 agc Exp $ */
/*-
* 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 <config.h>
#if defined __SUNPRO_C || defined __DECC || defined __HP_cc
# pragma ident "@(#)$Header: /cvsroot/wikipedia/willow/src/bin/willow/daemon.c,v 1.1 2005/05/02 19:15:21 kateturner Exp $"
# pragma ident "$NetBSD: daemon.c,v 1.9 2003/08/07 16:42:46 agc Exp $"
#endif
#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 <util/daemon.hpp>
#include <iostream>
namespace datadifferential {
namespace util {
pid_t parent_pid;
extern "C"
{
static void sigusr1_handler(int sig)
{
if (sig == SIGUSR1)
{
_exit(EXIT_SUCCESS);
}
}
}
bool daemon_is_ready(bool close_io)
{
if (kill(parent_pid, SIGUSR1) == -1)
{
perror("kill");
return false;
}
if (close_io == false)
{
return true;;
}
int fd;
if ((fd = open("/dev/null", O_RDWR, 0)) < 0)
{
perror("open");
return false;
}
else
{
if (dup2(fd, STDIN_FILENO) < 0)
{
perror("dup2 stdin");
return false;
}
if (dup2(fd, STDOUT_FILENO) < 0)
{
perror("dup2 stdout");
return false;
}
if (dup2(fd, STDERR_FILENO) < 0)
{
perror("dup2 stderr");
return false;
}
if (fd > STDERR_FILENO)
{
if (close(fd) < 0)
{
perror("close");
return false;
}
}
}
return true;
}
#ifndef __INTEL_COMPILER
#pragma GCC diagnostic ignored "-Wold-style-cast"
#endif
bool daemonize(bool is_chdir, bool wait_sigusr1)
{
struct sigaction new_action;
new_action.sa_handler= sigusr1_handler;
sigemptyset(&new_action.sa_mask);
new_action.sa_flags= 0;
sigaction(SIGUSR1, &new_action, NULL);
parent_pid= getpid();
pid_t child= fork();
switch (child)
{
case -1:
return false;
case 0:
break;
default:
if (wait_sigusr1)
{
/* parent */
int exit_code= EXIT_FAILURE;
int status;
while (waitpid(child, &status, 0) != child)
{ }
if (WIFEXITED(status))
{
exit_code= WEXITSTATUS(status);
}
if (WIFSIGNALED(status))
{
exit_code= EXIT_FAILURE;
}
_exit(exit_code);
}
else
{
_exit(EXIT_SUCCESS);
}
}
/* child */
if (setsid() == -1)
{
perror("setsid");
return false;
}
if (is_chdir)
{
if (chdir("/") < 0)
{
perror("chdir");
return false;
}
}
return true;
}
} /* namespace util */
} /* namespace datadifferential */
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