Elijah Stanger-Jones / mbed-dev-f303

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platform/mbed_poll.h@1:8a094db1347f, 2020-11-09 (annotated)

Committer:
elijahsj
Date:
Mon Nov 09 00:02:47 2020 -0500
Revision:
1:8a094db1347f
test

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elijahsj 1:8a094db1347f 1 /* mbed Microcontroller Library
elijahsj 1:8a094db1347f 2 * Copyright (c) 2017 ARM Limited
elijahsj 1:8a094db1347f 3 *
elijahsj 1:8a094db1347f 4 * Licensed under the Apache License, Version 2.0 (the "License");
elijahsj 1:8a094db1347f 5 * you may not use this file except in compliance with the License.
elijahsj 1:8a094db1347f 6 * You may obtain a copy of the License at
elijahsj 1:8a094db1347f 7 *
elijahsj 1:8a094db1347f 8 * http://www.apache.org/licenses/LICENSE-2.0
elijahsj 1:8a094db1347f 9 *
elijahsj 1:8a094db1347f 10 * Unless required by applicable law or agreed to in writing, software
elijahsj 1:8a094db1347f 11 * distributed under the License is distributed on an "AS IS" BASIS,
elijahsj 1:8a094db1347f 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elijahsj 1:8a094db1347f 13 * See the License for the specific language governing permissions and
elijahsj 1:8a094db1347f 14 * limitations under the License.
elijahsj 1:8a094db1347f 15 */
elijahsj 1:8a094db1347f 16 #ifndef MBED_POLL_H
elijahsj 1:8a094db1347f 17 #define MBED_POLL_H
elijahsj 1:8a094db1347f 18
elijahsj 1:8a094db1347f 19 #define POLLIN 0x0001 ///< Data may be read without blocking
elijahsj 1:8a094db1347f 20 #define POLLOUT 0x0010 ///< Data may be written without blocking
elijahsj 1:8a094db1347f 21 #define POLLERR 0x1000 ///< An error has occurred on the device or stream
elijahsj 1:8a094db1347f 22 #define POLLHUP 0x2000 ///< The device has been disconnected
elijahsj 1:8a094db1347f 23 #define POLLNVAL 0x4000 ///< The specified file handle value is invalid
elijahsj 1:8a094db1347f 24
elijahsj 1:8a094db1347f 25 namespace mbed {
elijahsj 1:8a094db1347f 26
elijahsj 1:8a094db1347f 27 class FileHandle;
elijahsj 1:8a094db1347f 28
elijahsj 1:8a094db1347f 29 /** \addtogroup platform */
elijahsj 1:8a094db1347f 30
elijahsj 1:8a094db1347f 31
elijahsj 1:8a094db1347f 32 struct pollfh {
elijahsj 1:8a094db1347f 33 FileHandle *fh;
elijahsj 1:8a094db1347f 34 short events;
elijahsj 1:8a094db1347f 35 short revents;
elijahsj 1:8a094db1347f 36 };
elijahsj 1:8a094db1347f 37
elijahsj 1:8a094db1347f 38 /** A mechanism to multiplex input/output over a set of file handles(file descriptors).
elijahsj 1:8a094db1347f 39 * For every file handle provided, poll() examines it for any events registered for that particular
elijahsj 1:8a094db1347f 40 * file handle.
elijahsj 1:8a094db1347f 41 *
elijahsj 1:8a094db1347f 42 * @param fhs an array of PollFh struct carrying a FileHandle and bitmasks of events
elijahsj 1:8a094db1347f 43 * @param nfhs number of file handles
elijahsj 1:8a094db1347f 44 * @param timeout timer value to timeout or -1 for loop forever
elijahsj 1:8a094db1347f 45 *
elijahsj 1:8a094db1347f 46 * @return number of file handles selected (for which revents is non-zero). 0 if timed out with nothing selected. -1 for error.
elijahsj 1:8a094db1347f 47 */
elijahsj 1:8a094db1347f 48 int poll(pollfh fhs[], unsigned nfhs, int timeout);
elijahsj 1:8a094db1347f 49
elijahsj 1:8a094db1347f 50 } // namespace mbed
elijahsj 1:8a094db1347f 51
elijahsj 1:8a094db1347f 52 #endif //MBED_POLL_H