ladybird/Userland/Libraries/LibC/poll.cpp

/*
 * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *
 * 2. 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 <Kernel/API/Syscall.h>
#include <errno.h>
#include <poll.h>
#include <sys/time.h>

extern "C" {

int poll(pollfd* fds, nfds_t nfds, int timeout_ms)
{
    timespec timeout;
    timespec* timeout_ts = &timeout;
    if (timeout_ms < 0)
        timeout_ts = nullptr;
    else
        timeout = { timeout_ms / 1000, (timeout_ms % 1000) * 1'000'000 };
    return ppoll(fds, nfds, timeout_ts, nullptr);
}

int ppoll(pollfd* fds, nfds_t nfds, const timespec* timeout, const sigset_t* sigmask)
{
    Syscall::SC_poll_params params { fds, nfds, timeout, sigmask };
    int rc = syscall(SC_poll, &params);
    __RETURN_WITH_ERRNO(rc, rc, -1);
}
}