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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "uv.h"
#include "internal.h"
#include <unistd.h>
#include <assert.h>
#include <errno.h>
static void uv__poll_io(EV_P_ ev_io* watcher, int ev_events) {
uv_poll_t* handle = watcher->data;
int events;
if (ev_events & EV_ERROR) {
/* An error happened. Libev has implicitly stopped the watcher, but we */
/* need to fix the refcount. */
uv_ref(handle->loop);
uv__set_sys_error(handle->loop, EBADF);
handle->poll_cb(handle, -1, 0);
return;
}
assert(ev_events & (EV_READ | EV_WRITE));
assert((ev_events & ~(EV_READ | EV_WRITE)) == 0);
events = 0;
if (ev_events & EV_READ)
events |= UV_READABLE;
if (ev_events & EV_WRITE)
events |= UV_WRITABLE;
handle->poll_cb(handle, 0, events);
}
int uv_poll_init(uv_loop_t* loop, uv_poll_t* handle, int fd) {
uv__handle_init(loop, (uv_handle_t*) handle, UV_POLL);
loop->counters.poll_init++;
handle->fd = fd;
handle->poll_cb = NULL;
ev_init(&handle->io_watcher, uv__poll_io);
handle->io_watcher.data = handle;
return 0;
}
int uv_poll_init_socket(uv_loop_t* loop, uv_poll_t* handle,
uv_os_sock_t socket) {
return uv_poll_init(loop, handle, socket);
}
static void uv__poll_stop(uv_poll_t* handle) {
if (ev_is_active(&handle->io_watcher)) {
ev_io_stop(handle->loop->ev, &handle->io_watcher);
uv_ref(handle->loop);
}
}
int uv_poll_stop(uv_poll_t* handle) {
assert(!(handle->flags & (UV_CLOSING | UV_CLOSED)));
uv__poll_stop(handle);
return 0;
}
int uv_poll_start(uv_poll_t* handle, int events, uv_poll_cb poll_cb) {
int ev_events;
int was_active;
assert((events & ~(UV_READABLE | UV_WRITABLE)) == 0);
assert(!(handle->flags & (UV_CLOSING | UV_CLOSED)));
if (events == 0) {
uv__poll_stop(handle);
return 0;
}
ev_events = 0;
if (events & UV_READABLE)
ev_events |= EV_READ;
if (events & UV_WRITABLE)
ev_events |= EV_WRITE;
was_active = ev_is_active(&handle->io_watcher);
ev_io_set(&handle->io_watcher, handle->fd, ev_events);
ev_io_start(handle->loop->ev, &handle->io_watcher);
if (!was_active)
uv_unref(handle->loop);
handle->poll_cb = poll_cb;
return 0;
}
void uv__poll_close(uv_poll_t* handle) {
uv__poll_stop(handle);
}
int uv__poll_active(const uv_poll_t* handle) {
return ev_is_active(&handle->io_watcher);
}
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