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/* tinyproxy - A fast light-weight HTTP proxy

* Copyright (C) 2002 Robert James Kaes <rjkaes@users.sourceforge.net>

*

* 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.

*/

/* This file contains functions which are useful when writing a

* daemon process. The functions include a "makedaemon" function and

* a function to portably set a signal handler.

*/

#include "main.h"

#include "daemon.h"

#include "log.h"

/*

* Fork a child process and then kill the parent so make the calling

* program a daemon process.

*/

void makedaemon (void)

{

if (fork () != 0)

exit (0);

setsid ();

set_signal_handler (SIGHUP, SIG_IGN);

if (fork () != 0)

exit (0);

if (chdir ("/") != 0) {

log_message (LOG_WARNING,

"Could not change directory to /");

}

umask (0177);

#ifdef NDEBUG

/*

* When not in debugging mode, close the standard file

* descriptors.

*/

close (0);

close (1);

close (2);

#endif

}

/*

* Pass a signal number and a signal handling function into this function

* to handle signals sent to the process.

*/

signal_func *set_signal_handler (int signo, signal_func * func)

{

struct sigaction act, oact;

act.sa_handler = func;

sigemptyset (&act.sa_mask);

act.sa_flags = 0;

if (signo == SIGALRM) {

#ifdef SA_INTERRUPT

act.sa_flags |= SA_INTERRUPT; /* SunOS 4.x */

#endif

} else {

#ifdef SA_RESTART

act.sa_flags |= SA_RESTART; /* SVR4, 4.4BSD */

#endif

}

if (sigaction (signo, &act, &oact) < 0)

return SIG_ERR;

return oact.sa_handler;

}