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/* Copyright (c) [2023] [Syswonder Community]
 *   [Rukos] is licensed under Mulan PSL v2.
 *   You can use this software according to the terms and conditions of the Mulan PSL v2.
 *   You may obtain a copy of Mulan PSL v2 at:
 *               http://license.coscl.org.cn/MulanPSL2
 *   THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT, MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 *   See the Mulan PSL v2 for more details.
 */

use crate::{ctypes, utils::e};

use core::ffi::c_int;

#[cfg(feature = "poll")]
use arceos_posix_api::sys_poll;
#[cfg(feature = "select")]
use arceos_posix_api::sys_select;
#[cfg(feature = "epoll")]
use arceos_posix_api::{sys_epoll_create, sys_epoll_ctl, sys_epoll_wait};

/// Creates a new epoll instance.
///
/// It returns a file descriptor referring to the new epoll instance.
#[cfg(feature = "epoll")]
#[no_mangle]
pub unsafe extern "C" fn epoll_create(size: c_int) -> c_int {
    e(sys_epoll_create(size))
}

/// Control interface for an epoll file descriptor
#[cfg(feature = "epoll")]
#[no_mangle]
pub unsafe extern "C" fn epoll_ctl(
    epfd: c_int,
    op: c_int,
    fd: c_int,
    event: *mut ctypes::epoll_event,
) -> c_int {
    e(sys_epoll_ctl(epfd, op, fd, event))
}

/// Waits for events on the epoll instance referred to by the file descriptor epfd.
#[cfg(feature = "epoll")]
#[no_mangle]
pub unsafe extern "C" fn epoll_wait(
    epfd: c_int,
    events: *mut ctypes::epoll_event,
    maxevents: c_int,
    timeout: c_int,
) -> c_int {
    e(sys_epoll_wait(epfd, events, maxevents, timeout))
}

/// Monitor multiple file descriptors, waiting until one or more of the file descriptors become "ready" for some class of I/O operation
#[cfg(feature = "select")]
#[no_mangle]
pub unsafe extern "C" fn select(
    nfds: c_int,
    readfds: *mut ctypes::fd_set,
    writefds: *mut ctypes::fd_set,
    exceptfds: *mut ctypes::fd_set,
    timeout: *mut ctypes::timeval,
) -> c_int {
    e(sys_select(nfds, readfds, writefds, exceptfds, timeout))
}

/// Monitor multiple file descriptors, waiting until one or more of the file descriptors become "ready" for some class of I/O operation
#[cfg(feature = "poll")]
#[no_mangle]
pub unsafe extern "C" fn poll(
    fds: *mut ctypes::pollfd,
    nfds: ctypes::nfds_t,
    timeout: c_int,
) -> c_int {
    e(sys_poll(fds, nfds, timeout))
}