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/**************************************************************************
* Copyright (C) 2008-2010 David Kellum
* This file is part of Hashdot.
*
* Hashdot 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 3, or (at your option)
* any later version.
*
* Hashdot 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 Hashdot. If not, see http://www.gnu.org/licenses/.
*
* Dynamically linking other modules to this executable is making a
* combined work based on this executable. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
*
* As a special exception, the Hashdot copyright holder gives you
* permission to dynamically link independent modules to this
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the combination under terms of
* your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived
* from or based from the source of Hashdot. If you modify Hashdot,
* you may extend this exception to your version, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*************************************************************************/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <apr_signal.h>
#include "runtime.h"
#include "daemon.h"
#include "property.h"
static const char * _redirect_fname = NULL;
static void reopen_streams( int signo );
apr_status_t check_daemonize()
{
apr_status_t rv = APR_SUCCESS;
const char * flag = NULL;
rv = get_property_value( "hashdot.daemonize", 0, 0, &flag );
int daemon = 0;
if( ( rv == APR_SUCCESS ) && ( flag != NULL ) &&
( strcmp( flag, "false" ) != 0 ) ) {
DEBUG( "Forking daemon." );
pid_t pid = fork();
if( pid < 0 ) {
rv = APR_FROM_OS_ERROR( errno );
}
if( pid > 0 ) { // Parent exit normally.
exit( 0 );
}
if( rv == APR_SUCCESS ) {
pid_t sid = setsid();
if( sid < 0 ) {
rv = APR_FROM_OS_ERROR( errno );
}
}
daemon = 1;
}
if( rv == APR_SUCCESS ) {
const char *fname = NULL;
rv = get_property_value( "hashdot.io_redirect.file", '/', 0, &fname );
if( ( fname != NULL ) ) {
flag = NULL;
rv = get_property_value( "hashdot.io_redirect.append",
0, 0, &flag );
int append = 1;
if( ( flag != NULL ) && ( strcmp( flag, "false" ) == 0 ) ) {
append = 0;
}
DEBUG( "Redirecting stdout/stderr to %s", fname );
if( ( freopen( "/dev/null", "r", stdin ) == NULL ) ||
( freopen( fname, append ? "a" : "w", stdout ) == NULL ) ||
( freopen( fname, append ? "a" : "w", stderr ) == NULL ) ) {
rv = APR_FROM_OS_ERROR( errno );
}
if( daemon ) _redirect_fname = fname;
}
}
return rv;
}
apr_status_t install_hup_handler()
{
if( _redirect_fname != NULL ) {
apr_signal( SIGHUP, &reopen_streams );
}
return APR_SUCCESS;
}
static void reopen_streams( int signo )
{
if( _redirect_fname != NULL ) {
if( freopen( _redirect_fname, "a", stdout ) == NULL ) {
print_error( APR_FROM_OS_ERROR( errno ), "freopen stdout" );
}
if( freopen( _redirect_fname, "a", stderr ) == NULL ) {
print_error( APR_FROM_OS_ERROR( errno ), "freopen stderr" );
}
}
}
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