85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* tinyproxy - A fast light-weight HTTP proxy
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* Copyright (C) 2002 Robert James Kaes <rjkaes@users.sourceforge.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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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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#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(0177);
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#if NDEBUG
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/*
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* When not in debugging mode, close the standard file
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* descriptors.
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*/
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close(0);
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close(1);
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close(2);
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#endif
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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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