124 lines
4.4 KiB
C
124 lines
4.4 KiB
C
/****************************************************************************
|
|
* include/sys/select.h
|
|
*
|
|
* Copyright (C) 2008-2009, 2011 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __INCLUDE_SYS_SELECT_H
|
|
#define __INCLUDE_SYS_SELECT_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdint.h>
|
|
#include <time.h>
|
|
|
|
#if CONFIG_NFILE_DESCRIPTORS > 0 || CONFIG_NSOCKET_DESCRIPTORS > 0
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* Get the total number of descriptors that we will have to support */
|
|
|
|
#define __SELECT_NDESCRIPTORS (CONFIG_NFILE_DESCRIPTORS + CONFIG_NSOCKET_DESCRIPTORS)
|
|
|
|
/* We will use a 32-bit bitsets to represent the set of descriptors. How
|
|
* many uint32_t's do we need to span all descriptors?
|
|
*/
|
|
|
|
#if __SELECT_NDESCRIPTORS <= 32
|
|
# define __SELECT_NUINT32 1
|
|
#elif __SELECT_NDESCRIPTORS <= 64
|
|
# define __SELECT_NUINT32 2
|
|
#elif __SELECT_NDESCRIPTORS <= 96
|
|
# define __SELECT_NUINT32 3
|
|
#elif __SELECT_NDESCRIPTORS <= 128
|
|
# define __SELECT_NUINT32 4
|
|
#elif __SELECT_NDESCRIPTORS <= 160
|
|
# define __SELECT_NUINT32 5
|
|
#elif __SELECT_NDESCRIPTORS <= 192
|
|
# define __SELECT_NUINT32 6
|
|
#elif __SELECT_NDESCRIPTORS <= 224
|
|
# define __SELECT_NUINT32 7
|
|
#elif __SELECT_NDESCRIPTORS <= 256
|
|
# define __SELECT_NUINT32 8
|
|
#else
|
|
# warning "Large fd_set needed"
|
|
#endif
|
|
|
|
/* These macros map a file descripto to an index and bit number */
|
|
|
|
#define _FD_NDX(fd) ((fd) >> 5)
|
|
#define _FD_BIT(fd) ((fd) & 0x1f)
|
|
|
|
/* Standard helper macros */
|
|
|
|
#define FD_CLR(fd,set) (((uint32_t*)(set))[_FD_NDX(fd)] &= ~(1 << _FD_BIT(fd)))
|
|
#define FD_SET(fd,set) (((uint32_t*)(set))[_FD_NDX(fd)] |= (1 << _FD_BIT(fd)))
|
|
#define FD_ISSET(fd,set) ((((uint32_t*)(set))[_FD_NDX(fd)] & (1 << _FD_BIT(fd))) != 0)
|
|
#define FD_ZERO(set) memset(set, 0, sizeof(fd_set))
|
|
|
|
/****************************************************************************
|
|
* Type Definitions
|
|
****************************************************************************/
|
|
|
|
typedef uint32_t fd_set[__SELECT_NUINT32];
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
#define EXTERN extern "C"
|
|
extern "C"
|
|
{
|
|
#else
|
|
#define EXTERN extern
|
|
#endif
|
|
|
|
struct timeval;
|
|
int select(int nfds, FAR fd_set *readfds, FAR fd_set *writefds,
|
|
FAR fd_set *exceptfds, FAR struct timeval *timeout);
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* CONFIG_NFILE_DESCRIPTORS || CONFIG_NSOCKET_DESCRIPTORS */
|
|
#endif /* __INCLUDE_SYS_SELECT_H */
|