/* Prosody IM v0.1

-- Copyright (C) 2008 Matthew Wild

-- Copyright (C) 2008 Waqas Hussain

-- 

-- This program is free software; you can redistribute it and/or

-- modify it under the terms of the GNU General Public License

-- as published by the Free Software Foundation; either version 2

-- of the License, or (at your option) any later version.

-- 

-- This program is distributed in the hope that it will be useful,

-- but WITHOUT ANY WARRANTY; without even the implied warranty of

-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

-- GNU General Public License for more details.

-- 

-- You should have received a copy of the GNU General Public License

-- along with this program; if not, write to the Free Software

-- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

*/

/* pposix.c

   POSIX support functions for Lua

*/

#include <stdlib.h>

#include <unistd.h>

#include <libgen.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include "lua.h"

static int daemonize(lua_State *L)

{

	pid_t pid;

	if ( getppid() == 1 )

	{

		lua_pushboolean(L, 0);

		lua_pushstring(L, "already-daemonized");

		return 2;

	}

	/* Attempt initial fork */

	if((pid = fork()) < 0)

	{

		/* Forking failed */

		lua_pushboolean(L, 0);

		lua_pushstring(L, "fork-failed");

		return 2;

	}

	else if(pid != 0)

	{

		/* We are the parent process */

		lua_pushboolean(L, 1);

		lua_pushnumber(L, pid);

		return 2;

	}

	/* and we are the child process */

	if(setsid() == -1)

	{

		/* We failed to become session leader */

		/* (we probably already were) */

		lua_pushboolean(L, 0);

		lua_pushstring(L, "setsid-failed");

		return 2;

	}

	/* Close stdin, stdout, stderr */

/*	close(0);

	close(1);

	close(2);

*/

	/* Final fork, use it wisely */

	if(fork())

		exit(0);

	/* Show's over, let's continue */

	lua_pushboolean(L, 1);

	lua_pushnil(L);

	return 2;

}

int luaopen_util_pposix(lua_State *L)

{

	lua_newtable(L);

	lua_pushcfunction(L, daemonize);

	lua_setfield(L, -2, "daemonize");

	return 1;

};