105 lines
3.3 KiB
C
105 lines
3.3 KiB
C
/* sys.c - linux-specific signal and epoll functions
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*
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* Copyright (c) 2010-2011 Nicholas J. Kain <njkain at gmail dot com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <signal.h>
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#include <sys/epoll.h>
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#include <sys/signalfd.h>
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#include "config.h"
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#include "log.h"
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#include "pidfile.h"
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#include "sys.h"
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char pidfile[MAX_PATH_LENGTH] = PID_FILE_DEFAULT;
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void setup_signals_ndhc(struct client_state_t *cs)
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{
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sigset_t mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGUSR1);
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sigaddset(&mask, SIGUSR2);
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sigaddset(&mask, SIGCHLD);
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sigaddset(&mask, SIGPIPE);
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sigaddset(&mask, SIGTERM);
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if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
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suicide("sigprocmask failed");
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if (cs->signalFd >= 0) {
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epoll_del(cs, cs->signalFd);
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close(cs->signalFd);
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}
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cs->signalFd = signalfd(-1, &mask, SFD_NONBLOCK);
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if (cs->signalFd < 0)
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suicide("signalfd failed");
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epoll_add(cs, cs->signalFd);
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}
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// @cs can be NULL
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void background(struct client_state_t *cs)
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{
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static char called;
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if (!called) {
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called = 1; // Do not fork again.
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if (daemon(0, 0) == -1) {
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perror("fork");
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exit(EXIT_SUCCESS);
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}
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if (cs)
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setup_signals_ndhc(cs);
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}
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if (file_exists(pidfile, "w") == -1) {
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log_line("Cannot open pidfile for write!");
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} else
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write_pid(pidfile);
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}
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void epoll_add(struct client_state_t *cs, int fd)
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{
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struct epoll_event ev;
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int r;
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ev.events = EPOLLIN | EPOLLRDHUP | EPOLLERR | EPOLLHUP;
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ev.data.fd = fd;
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r = epoll_ctl(cs->epollFd, EPOLL_CTL_ADD, fd, &ev);
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if (r == -1)
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suicide("epoll_add failed %s", strerror(errno));
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}
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void epoll_del(struct client_state_t *cs, int fd)
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{
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struct epoll_event ev;
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int r;
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ev.events = EPOLLIN | EPOLLRDHUP | EPOLLERR | EPOLLHUP;
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ev.data.fd = fd;
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r = epoll_ctl(cs->epollFd, EPOLL_CTL_DEL, fd, &ev);
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if (r == -1)
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suicide("epoll_del failed %s", strerror(errno));
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}
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