75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
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/* $Id: daemon.c,v 1.1 2002-05-23 04:39:32 rjkaes Exp $
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*
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* This file contains functions which are useful when writing a
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* daemon process. The functions include a "makedaemon" function and
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* a function to portably set a signal handler.
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*
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* Copyright (C) 2002 Robert James Kaes (rjkaes@flarenet.com)
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#include "tinyproxy.h"
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#include "daemon.h"
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/*
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* Fork a child process and then kill the parent so make the calling
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* program a daemon process.
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*/
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void
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makedaemon(void)
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{
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if (fork() != 0)
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exit(0);
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setsid();
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set_signal_handler(SIGHUP, SIG_IGN);
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if (fork() != 0)
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exit(0);
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chdir("/");
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umask(077);
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close(0);
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close(1);
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close(2);
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}
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/*
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* Pass a signal number and a signal handling function into this function
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* to handle signals sent to the process.
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*/
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signal_func *
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set_signal_handler(int signo, signal_func *func)
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{
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struct sigaction act, oact;
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act.sa_handler = func;
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sigemptyset(&act.sa_mask);
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act.sa_flags = 0;
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if (signo == SIGALRM) {
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#ifdef SA_INTERRUPT
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act.sa_flags |= SA_INTERRUPT; /* SunOS 4.x */
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#endif
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} else {
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#ifdef SA_RESTART
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act.sa_flags |= SA_RESTART; /* SVR4, 4.4BSD */
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#endif
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}
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if (sigaction(signo, &act, &oact) < 0)
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return SIG_ERR;
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return oact.sa_handler;
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}
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