ndhc/src/sys.c

/* sys.c - linux-specific signal and epoll functions
 *
 * Copyright 2010-2020 Nicholas J. Kain <njkain at gmail dot com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <sys/epoll.h>
#include "nk/log.h"
#include "nk/io.h"
#include "ndhc.h"
#include "sys.h"

long long IMPL_curms(const char *parent_function)
{
    struct timespec ts;
    if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0) {
        suicide("%s: (%s) clock_gettime failed: %s",
                client_config.interface, parent_function, strerror(errno));
    }
    return ts.tv_sec * 1000LL + ts.tv_nsec / 1000000LL;
}

void epoll_add(int epfd, int fd)
{
    struct epoll_event ev;
    int r;
    ev.events = EPOLLIN | EPOLLRDHUP | EPOLLERR | EPOLLHUP;
    ev.data.fd = fd;
    r = epoll_ctl(epfd, EPOLL_CTL_ADD, fd, &ev);
    if (r < 0)
        suicide("epoll_add failed %s", strerror(errno));
}

void epoll_del(int epfd, int fd)
{
    struct epoll_event ev;
    int r;
    ev.events = EPOLLIN | EPOLLRDHUP | EPOLLERR | EPOLLHUP;
    ev.data.fd = fd;
    r = epoll_ctl(epfd, EPOLL_CTL_DEL, fd, &ev);
    if (r < 0)
        suicide("epoll_del failed %s", strerror(errno));
}

void setup_signals_subprocess(void)
{
    sigset_t mask;
    if (sigprocmask(0, 0, &mask) < 0)
        suicide("sigprocmask failed");
    if (sigaddset(&mask, SIGPIPE))
        suicide("sigaddset failed");
    if (sigprocmask(SIG_SETMASK, &mask, (sigset_t *)0) < 0)
        suicide("sigprocmask failed");
}