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platform/mbed_poll.h
- Committer:
- thedo
- Date:
- 2017-07-04
- Revision:
- 170:54ff26da7eb6
- Parent:
- 166:3a9487d57a5c
File content as of revision 170:54ff26da7eb6:
/* mbed Microcontroller Library * Copyright (c) 2017 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef MBED_POLL_H #define MBED_POLL_H #define POLLIN 0x0001 ///< Data may be read without blocking #define POLLOUT 0x0010 ///< Data may be written without blocking #define POLLERR 0x1000 ///< An error has occurred on the device or stream #define POLLHUP 0x2000 ///< The device has been disconnected #define POLLNVAL 0x4000 ///< The specified file handle value is invalid namespace mbed { class FileHandle; /** \addtogroup platform */ struct pollfh { FileHandle *fh; short events; short revents; }; /** A mechanism to multiplex input/output over a set of file handles(file descriptors). * For every file handle provided, poll() examines it for any events registered for that particular * file handle. * * @param fhs an array of PollFh struct carrying a FileHandle and bitmasks of events * @param nfhs number of file handles * @param timeout timer value to timeout or -1 for loop forever * * @return number of file handles selected (for which revents is non-zero). 0 if timed out with nothing selected. -1 for error. */ int poll(pollfh fhs[], unsigned nfhs, int timeout); } // namespace mbed #endif //MBED_POLL_H