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Initial addition into CVS. Moves various functions relating the daemon

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processes.  Added a portable signal handler setting function.
This commit is contained in:
Robert James Kaes 2002-05-23 04:39:32 +00:00
parent 65cf5ea290
commit 2ee61db6af
2 changed files with 107 additions and 0 deletions
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74
src/daemon.c Normal file
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/* $Id: daemon.c,v 1.1 2002-05-23 04:39:32 rjkaes Exp $
*
* 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.
*
* Copyright (C) 2002 Robert James Kaes (rjkaes@flarenet.com)
*
* 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, 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.
*/
#include "tinyproxy.h"
#include "daemon.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);
chdir("/");
umask(077);
close(0);
close(1);
close(2);
}
/*
* 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;
}

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src/daemon.h Normal file
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/* $Id: daemon.h,v 1.1 2002-05-23 04:39:32 rjkaes Exp $
*
* See 'daemon.c' for a detailed description.
*
* Copyright (C) 2002 Robert James Kaes (rjkaes@flarenet.com)
*
* 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, 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.
*/
#ifndef TINYPROXY_DAEMON_H
#define TINYPROXY_DAEMON_H
typedef void signal_func(int);
/*
* Pass a singal integer and a function to handle the signal.
*/
extern signal_func *set_signal_handler(int signo, signal_func *func);
/*
* Make a program a daemon process
*/
extern void makedaemon(void);
#endif