120 lines
4.4 KiB
C
120 lines
4.4 KiB
C
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/****************************************************************************
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* include/sys/select.h
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*
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* Copyright (C) 2008 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 <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'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*)(set))[_FD_NDX(fd)] &= ~(1 << _FD_BIT(fd)))
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#define FD_SET(fd,set) (((uint32*)(set))[_FD_NDX(fd)] |= (1 << _FD_BIT(fd)))
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#define FD_ISSET(fd,set) ((((uint32*)(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 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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