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76 lines
2.0 KiB
76 lines
2.0 KiB
/**
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* \file
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* Disconnect from parent process and let all standard file handles
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* point to /dev/null.
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*
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* \author Georg Hopp
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*
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* \copyright
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* Copyright © 2012 Georg Hopp
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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 3 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
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h> // for printf() and fprintf()
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#include <unistd.h> // for getopt
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#define WORKDIR "/"
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#define UMASK 0
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void daemonize(void) {
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pid_t pid;
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if (0 > ((pid = fork()))) {
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perror("deamoinze[fork]");
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exit(EXIT_FAILURE);
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} else if (0 != pid) {
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exit(EXIT_SUCCESS);
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}
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// make new child session leader
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setsid();
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if (0 > ((pid = fork()))) {
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perror("deamoinze[fork]");
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exit(EXIT_FAILURE);
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} else if (0 != pid) {
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exit(EXIT_SUCCESS);
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}
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// set umask and change to working directory to /
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umask(UMASK);
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if (-1 == chdir("/")) {
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perror("daemonize");
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exit(EXIT_FAILURE);
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}
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// we should close all open filedescriptors now.
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// But I assume that this function is called at the very start of the
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// program and no more filedescriptors are open than the standard
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// ones.
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// connect all standard streams to /dev/null
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stderr = freopen("/dev/null", "w", stderr);
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stdin = freopen("/dev/null", "r", stdin);
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stdout = freopen("/dev/null", "w", stdout);
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}
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// vim: set ts=4 sw=4:
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