contrib/dnsperf-2.1.0.0-1/os.c

/*
 * Copyright (C) 2011 - 2015 Nominum, Inc.
 *
 * Permission to use, copy, modify, and distribute this software and its
 * documentation for any purpose with or without fee is hereby granted,
 * provided that the above copyright notice and this permission notice
 * appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <errno.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>

#include <sys/select.h>

#include <isc/result.h>
#include <isc/types.h>

#include "log.h"
#include "os.h"
#include "util.h"

void
perf_os_blocksignal(int sig, isc_boolean_t block)
{
    sigset_t sset;
    int op;

    op = block ? SIG_BLOCK : SIG_UNBLOCK;

    if (sigemptyset(&sset) < 0 ||
        sigaddset(&sset, sig) < 0 ||
        pthread_sigmask(op, &sset, NULL) < 0)
        perf_log_fatal("pthread_sigmask: %s", strerror(errno));
}

void
perf_os_handlesignal(int sig, void (*handler)(int))
{
    struct sigaction sa;

    memset(&sa, 0, sizeof(sa));
    sa.sa_handler = handler;

    if (sigfillset(&sa.sa_mask) < 0 ||
        sigaction(sig, &sa, NULL) < 0)
        perf_log_fatal("sigaction: %s", strerror(errno));
}

isc_result_t
perf_os_waituntilreadable(int fd, int pipe_fd, isc_int64_t timeout)
{
    fd_set read_fds;
    int maxfd;
    struct timeval tv, *tvp;
    int n;

    FD_ZERO(&read_fds);
    FD_SET(fd, &read_fds);
    FD_SET(pipe_fd, &read_fds);
    maxfd = pipe_fd > fd ? pipe_fd : fd;
    if (timeout < 0) {
        tvp = NULL;
    } else {
        tv.tv_sec = timeout / MILLION;
        tv.tv_usec = timeout % MILLION;
        tvp = &tv;
    }
    n = select(maxfd + 1, &read_fds, NULL, NULL, tvp);
    if (n < 0) {
        if (errno != EINTR)
            perf_log_fatal("select() failed");
        return (ISC_R_CANCELED);
    } else if (FD_ISSET(fd, &read_fds)) {
        return (ISC_R_SUCCESS);
    } else if (FD_ISSET(pipe_fd, &read_fds)) {
        return (ISC_R_CANCELED);
    } else {
        return (ISC_R_TIMEDOUT);
    }
}

isc_result_t
perf_os_waituntilanyreadable(int *fds, unsigned int nfds, int pipe_fd,
                 isc_int64_t timeout)
{
    fd_set read_fds;
    unsigned int i;
    int maxfd;
    struct timeval tv, *tvp;
    int n;

    FD_ZERO(&read_fds);
    maxfd = 0;
    for (i = 0; i < nfds; i++) {
        FD_SET(fds[i], &read_fds);
        if (fds[i] > maxfd)
            maxfd = fds[i];
    }
    FD_SET(pipe_fd, &read_fds);
    if (pipe_fd > maxfd)
        maxfd = pipe_fd;

    if (timeout < 0) {
        tvp = NULL;
    } else {
        tv.tv_sec = timeout / MILLION;
        tv.tv_usec = timeout % MILLION;
        tvp = &tv;
    }
    n = select(maxfd + 1, &read_fds, NULL, NULL, tvp);
    if (n < 0) {
        if (errno != EINTR)
            perf_log_fatal("select() failed");
        return (ISC_R_CANCELED);
    } else if (n == 0) {
        return (ISC_R_TIMEDOUT);
    } else if (FD_ISSET(pipe_fd, &read_fds)) {
        return (ISC_R_CANCELED);
    } else {
        return (ISC_R_SUCCESS);
    }
}