100 lines
3.2 KiB
C
100 lines
3.2 KiB
C
/* sys.c - linux-specific signal and epoll functions
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*
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* Copyright (c) 2010-2015 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 <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 "nk/log.h"
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#include "nk/io.h"
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#include "ndhc.h"
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#include "sys.h"
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void epoll_add(int epfd, 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(epfd, EPOLL_CTL_ADD, fd, &ev);
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if (r < 0)
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suicide("epoll_add failed %s", strerror(errno));
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}
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void epoll_del(int epfd, 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(epfd, EPOLL_CTL_DEL, fd, &ev);
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if (r < 0)
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suicide("epoll_del failed %s", strerror(errno));
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}
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int setup_signals_subprocess(void)
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{
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sigset_t mask;
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sigemptyset(&mask);
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sigaddset(&mask, SIGHUP);
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sigaddset(&mask, SIGINT);
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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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int sfd = signalfd(-1, &mask, SFD_NONBLOCK);
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if (sfd < 0)
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suicide("signalfd failed");
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return sfd;
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}
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void signal_dispatch_subprocess(int sfd, const char pname[static 1])
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{
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struct signalfd_siginfo si = {0};
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ssize_t r = safe_read(sfd, (char *)&si, sizeof si);
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if (r < 0) {
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log_error("%s: %s: error reading from signalfd: %s",
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client_config.interface, pname, strerror(errno));
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return;
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}
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if ((size_t)r < sizeof si) {
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log_error("%s: %s: short read from signalfd: %zd < %zu",
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client_config.interface, pname, r, sizeof si);
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return;
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}
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switch (si.ssi_signo) {
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case SIGINT:
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case SIGTERM:
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case SIGHUP: exit(EXIT_SUCCESS); break;
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default: break;
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}
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}
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