Jeremy Soller
118 lines
2.6 KiB
Rust
118 lines
2.6 KiB
Rust
//! poll implementation for Redox, following http://pubs.opengroup.org/onlinepubs/7908799/xsh/poll.h.html
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use core::{mem, slice};
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use fs::File;
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use header::sys_epoll::{
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epoll_create1, EPOLL_CLOEXEC,
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epoll_ctl, EPOLL_CTL_ADD,
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epoll_wait,
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EPOLLIN, EPOLLPRI, EPOLLOUT, EPOLLERR, EPOLLHUP, EPOLLNVAL,
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epoll_data, epoll_event
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};
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use platform::types::*;
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pub const POLLIN: c_short = 0x001;
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pub const POLLPRI: c_short = 0x002;
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pub const POLLOUT: c_short = 0x004;
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pub const POLLERR: c_short = 0x008;
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pub const POLLHUP: c_short = 0x010;
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pub const POLLNVAL: c_short = 0x020;
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pub type nfds_t = c_ulong;
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#[repr(C)]
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pub struct pollfd {
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pub fd: c_int,
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pub events: c_short,
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pub revents: c_short,
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}
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pub fn poll_epoll(fds: &mut [pollfd], timeout: c_int) -> c_int {
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let event_map = [
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(POLLIN, EPOLLIN),
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(POLLPRI, EPOLLPRI),
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(POLLOUT, EPOLLOUT),
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(POLLERR, EPOLLERR),
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(POLLHUP, EPOLLHUP),
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(POLLNVAL, EPOLLNVAL)
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];
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let ep = {
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let epfd = epoll_create1(EPOLL_CLOEXEC);
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if epfd < 0 {
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return -1;
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}
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File::new(epfd)
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};
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for i in 0..fds.len() {
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let mut pfd = &mut fds[i];
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let mut event = epoll_event {
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events: 0,
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data: epoll_data {
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u64: i as u64,
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},
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};
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for (p, ep) in event_map.iter() {
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if pfd.events & p > 0 {
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event.events |= ep;
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}
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}
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pfd.revents = 0;
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if epoll_ctl(*ep, EPOLL_CTL_ADD, pfd.fd, &mut event) < 0 {
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return -1;
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}
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}
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let mut events: [epoll_event; 32] = unsafe { mem::zeroed() };
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let res = epoll_wait(
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*ep,
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events.as_mut_ptr(),
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events.len() as c_int,
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timeout
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);
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if res < 0 {
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return -1;
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}
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for i in 0..res as usize {
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let event = &events[i];
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let pi = unsafe { event.data.u64 as usize };
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// TODO: Error status when fd does not match?
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if let Some(pfd) = fds.get_mut(pi) {
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for (p, ep) in event_map.iter() {
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if event.events & ep > 0 {
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pfd.revents |= p;
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}
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}
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}
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}
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let mut count = 0;
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for pfd in fds.iter() {
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if pfd.revents > 0 {
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count += 1;
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}
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}
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count
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}
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#[no_mangle]
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pub unsafe extern "C" fn poll(fds: *mut pollfd, nfds: nfds_t, timeout: c_int) -> c_int {
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trace_expr!(
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poll_epoll(
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slice::from_raw_parts_mut(fds, nfds as usize),
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timeout
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),
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"poll({:p}, {}, {})",
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fds,
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nfds,
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timeout
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)
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}
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