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138 lines
4.7 KiB
138 lines
4.7 KiB
/**************************************************************************** |
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* include/poll.h |
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* |
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* Copyright (C) 2008-2009 Gregory Nutt. All rights reserved. |
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* Author: Gregory Nutt <gnutt@nuttx.org> |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* 3. Neither the name NuttX nor the names of its contributors may be |
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* used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS |
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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* POSSIBILITY OF SUCH DAMAGE. |
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* |
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****************************************************************************/ |
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#ifndef __INCLUDE_POLL_H |
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#define __INCLUDE_POLL_H |
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/**************************************************************************** |
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* Included Files |
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****************************************************************************/ |
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#include <nuttx/config.h> |
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#include <stdint.h> |
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#include <semaphore.h> |
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/**************************************************************************** |
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* Pre-processor Definitions |
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****************************************************************************/ |
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/* Poll event definitions: |
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* |
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* POLLIN |
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* Data other than high-priority data may be read without blocking. |
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* POLLRDNORM |
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* Normal data may be read without blocking. |
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* POLLRDBAND |
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* Priority data may be read without blocking. |
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* POLLPRI |
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* High priority data may be read without blocking. |
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* POLLOUT |
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* Normal data may be written without blocking. |
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* POLLWRNORM |
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* Equivalent to POLLOUT. |
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* POLLWRBAND |
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* Priority data may be written. |
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* POLLERR |
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* An error has occurred (revents only). |
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* POLLHUP |
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* Device has been disconnected (revents only). |
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* POLLNVAL |
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* Invalid fd member (revents only). |
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*/ |
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#define POLLIN (0x01) /* NuttX does not make priority distinctions */ |
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#define POLLRDNORM (0x01) |
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#define POLLRDBAND (0x01) |
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#define POLLPRI (0x01) |
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#define POLLOUT (0x02) /* NuttX does not make priority distinctions */ |
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#define POLLWRNORM (0x02) |
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#define POLLWRBAND (0x02) |
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#define POLLERR (0x04) |
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#define POLLHUP (0x08) |
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#define POLLNVAL (0x10) |
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/**************************************************************************** |
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* Public Type Definitions |
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****************************************************************************/ |
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/* The number of poll descriptors (required by poll() specification */ |
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typedef unsigned int nfds_t; |
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/* In the standard poll() definition, the size of the event set is 'short'. |
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* Here we pick the smallest storage element that will contain all of the |
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* poll events. |
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*/ |
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typedef uint8_t pollevent_t; |
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/* This is the Nuttx variant of the standard pollfd structure. */ |
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struct pollfd |
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{ |
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int fd; /* The descriptor being polled */ |
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sem_t *sem; /* Pointer to semaphore used to post output event */ |
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pollevent_t events; /* The input event flags */ |
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pollevent_t revents; /* The output event flags */ |
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FAR void *priv; /* For use by drivers */ |
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}; |
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/**************************************************************************** |
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* Public Variables |
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****************************************************************************/ |
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#undef EXTERN |
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#if defined(__cplusplus) |
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#define EXTERN extern "C" |
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extern "C" { |
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#else |
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#define EXTERN extern |
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#endif |
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/**************************************************************************** |
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* Public Function Prototypes |
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****************************************************************************/ |
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EXTERN int poll(FAR struct pollfd *fds, nfds_t nfds, int timeout); |
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#undef EXTERN |
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#if defined(__cplusplus) |
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} |
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#endif |
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#endif /* __INCLUDE_POLL_H */
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