120 lines
3.6 KiB
C
120 lines
3.6 KiB
C
/****************************************************************************
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* include/sys/select.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. 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, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 <signal.h>
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#include <sys/time.h>
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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 FD_SETSIZE 256
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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 FD_SETSIZE <= 32
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# define __SELECT_NUINT32 1
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#elif FD_SETSIZE <= 64
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# define __SELECT_NUINT32 2
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#elif FD_SETSIZE <= 96
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# define __SELECT_NUINT32 3
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#elif FD_SETSIZE <= 128
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# define __SELECT_NUINT32 4
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#elif FD_SETSIZE <= 160
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# define __SELECT_NUINT32 5
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#elif FD_SETSIZE <= 192
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# define __SELECT_NUINT32 6
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#elif FD_SETSIZE <= 224
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# define __SELECT_NUINT32 7
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#elif FD_SETSIZE <= 256
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# define __SELECT_NUINT32 8
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#else
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# warning "Larger fd_set needed"
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#endif
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/* These macros map a file descriptor 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) \
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((((fd_set*)(set))->arr)[_FD_NDX(fd)] &= ~(UINT32_C(1)<< _FD_BIT(fd)))
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#define FD_SET(fd,set) \
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((((fd_set*)(set))->arr)[_FD_NDX(fd)] |= (UINT32_C(1) << _FD_BIT(fd)))
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#define FD_ISSET(fd,set) \
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(((((fd_set*)(set))->arr)[_FD_NDX(fd)] & (UINT32_C(1) << _FD_BIT(fd))) != 0)
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#define FD_ZERO(set) \
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memset((set), 0, sizeof(fd_set))
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/****************************************************************************
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* Type Definitions
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****************************************************************************/
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struct fd_set_s
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{
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uint32_t arr[__SELECT_NUINT32];
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};
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typedef struct fd_set_s fd_set;
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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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{
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#else
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#define EXTERN extern
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#endif
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struct timeval;
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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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int pselect(int nfds, FAR fd_set *readfds, FAR fd_set *writefds,
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FAR fd_set *exceptfds, FAR const struct timespec *timeout,
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FAR const sigset_t *sigmask);
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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_SYS_SELECT_H */
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