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121 lines
4.4 KiB
121 lines
4.4 KiB
/**************************************************************************** |
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* include/sys/select.h |
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* |
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* Copyright (C) 2008-2009, 2011 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_SYS_SELECT_H |
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#define __INCLUDE_SYS_SELECT_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 <time.h> |
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#if CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0 |
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/**************************************************************************** |
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* Pre-Processor Definitions |
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****************************************************************************/ |
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/* Get the total number of descriptors that we will have to support */ |
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#define __SELECT_NDESCRIPTORS (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS) |
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/* We will use a 32-bit bitsets to represent the set of descriptors. How |
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* many uint32_t's do we need to span all descriptors? |
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*/ |
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#if __SELECT_NDESCRIPTORS <= 32 |
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# define __SELECT_NUINT32 1 |
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#elif __SELECT_NDESCRIPTORS <= 64 |
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# define __SELECT_NUINT32 2 |
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#elif __SELECT_NDESCRIPTORS <= 96 |
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# define __SELECT_NUINT32 3 |
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#elif __SELECT_NDESCRIPTORS <= 128 |
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# define __SELECT_NUINT32 4 |
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#elif __SELECT_NDESCRIPTORS <= 160 |
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# define __SELECT_NUINT32 5 |
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#elif __SELECT_NDESCRIPTORS <= 192 |
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# define __SELECT_NUINT32 6 |
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#elif __SELECT_NDESCRIPTORS <= 224 |
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# define __SELECT_NUINT32 7 |
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#elif __SELECT_NDESCRIPTORS <= 256 |
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# define __SELECT_NUINT32 8 |
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#else |
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# warning "Large fd_set needed" |
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#endif |
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/* These macros map a file descripto to an index and bit number */ |
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#define _FD_NDX(fd) ((fd) >> 5) |
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#define _FD_BIT(fd) ((fd) & 0x1f) |
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/* Standard helper macros */ |
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#define FD_CLR(fd,set) (((uint32_t*)(set))[_FD_NDX(fd)] &= ~(1 << _FD_BIT(fd))) |
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#define FD_SET(fd,set) (((uint32_t*)(set))[_FD_NDX(fd)] |= (1 << _FD_BIT(fd))) |
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#define FD_ISSET(fd,set) ((((uint32_t*)(set))[_FD_NDX(fd)] & (1 << _FD_BIT(fd))) != 0) |
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#define FD_ZERO(set) memset(set, 0, sizeof(fd_set)) |
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/**************************************************************************** |
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* Type Definitions |
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****************************************************************************/ |
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typedef uint32_t fd_set[__SELECT_NUINT32]; |
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/**************************************************************************** |
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* Public Function Prototypes |
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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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EXTERN int select(int nfds, FAR fd_set *readfds, FAR fd_set *writefds, |
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FAR fd_set *exceptfds, FAR struct timeval *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 /* CONFIG_NFILE_DESCRIPTORS || CONFIG_NSOCKET_DESCRIPTORS */ |
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#endif /* __INCLUDE_SYS_SELECT_H */
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