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