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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(uv_loop_t* loop, uv__io_t* w, unsigned int events) {
uv_poll_t* handle;
int pevents;
handle = container_of(w, uv_poll_t, io_watcher);
/*
* As documented in the kernel source fs/kernfs/file.c #780
* poll will return POLLERR|POLLPRI in case of sysfs
* polling. This does not happen in case of out-of-band
* TCP messages.
*
* The above is the case on (at least) FreeBSD and Linux.
*
* So to properly determine a POLLPRI or a POLLERR we need
* to check for both.
*/
if ((events & POLLERR) && !(events & UV__POLLPRI)) {
uv__io_stop(loop, w, POLLIN | POLLOUT | UV__POLLRDHUP | UV__POLLPRI);
uv__handle_stop(handle);
handle->poll_cb(handle, UV_EBADF, 0);
return;
}
pevents = 0;
if (events & POLLIN)
pevents |= UV_READABLE;
if (events & UV__POLLPRI)
pevents |= UV_PRIORITIZED;
if (events & POLLOUT)
pevents |= UV_WRITABLE;
if (events & UV__POLLRDHUP)
pevents |= UV_DISCONNECT;
handle->poll_cb(handle, 0, pevents);
}
int uv_poll_init(uv_loop_t* loop, uv_poll_t* handle, int fd) {
int err;
if (uv__fd_exists(loop, fd))
return UV_EEXIST;
err = uv__io_check_fd(loop, fd);
if (err)
return err;
/* If ioctl(FIONBIO) reports ENOTTY, try fcntl(F_GETFL) + fcntl(F_SETFL).
* Workaround for e.g. kqueue fds not supporting ioctls.
*/
err = uv__nonblock(fd, 1);
if (err == UV_ENOTTY)
if (uv__nonblock == uv__nonblock_ioctl)
err = uv__nonblock_fcntl(fd, 1);
if (err)
return err;
uv__handle_init(loop, (uv_handle_t*) handle, UV_POLL);
uv__io_init(&handle->io_watcher, uv__poll_io, fd);
handle->poll_cb = NULL;
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) {
uv__io_stop(handle->loop,
&handle->io_watcher,
POLLIN | POLLOUT | UV__POLLRDHUP | UV__POLLPRI);
uv__handle_stop(handle);
uv__platform_invalidate_fd(handle->loop, handle->io_watcher.fd);
}
int uv_poll_stop(uv_poll_t* handle) {
assert(!uv__is_closing(handle));
uv__poll_stop(handle);
return 0;
}
int uv_poll_start(uv_poll_t* handle, int pevents, uv_poll_cb poll_cb) {
int events;
assert((pevents & ~(UV_READABLE | UV_WRITABLE | UV_DISCONNECT |
UV_PRIORITIZED)) == 0);
assert(!uv__is_closing(handle));
uv__poll_stop(handle);
if (pevents == 0)
return 0;
events = 0;
if (pevents & UV_READABLE)
events |= POLLIN;
if (pevents & UV_PRIORITIZED)
events |= UV__POLLPRI;
if (pevents & UV_WRITABLE)
events |= POLLOUT;
if (pevents & UV_DISCONNECT)
events |= UV__POLLRDHUP;
uv__io_start(handle->loop, &handle->io_watcher, events);
uv__handle_start(handle);
handle->poll_cb = poll_cb;
return 0;
}
void uv__poll_close(uv_poll_t* handle) {
uv__poll_stop(handle);
}