8a668fe733
This change stops the warning "implicit declaration of function 'memset'" when using the `FD_ZERO` macro.
135 lines
4.2 KiB
C
135 lines
4.2 KiB
C
/****************************************************************************
|
|
* include/sys/select.h
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __INCLUDE_SYS_SELECT_H
|
|
#define __INCLUDE_SYS_SELECT_H
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <limits.h>
|
|
#include <stdint.h>
|
|
#include <signal.h>
|
|
#include <string.h>
|
|
#include <sys/time.h>
|
|
|
|
#ifdef CONFIG_FDCHECK
|
|
# include <nuttx/fdcheck.h>
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/* Get the total number of descriptors that we will have to support */
|
|
|
|
#define FD_SETSIZE OPEN_MAX
|
|
|
|
/* 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 FD_SETSIZE <= 32
|
|
# define __SELECT_NUINT32 1
|
|
#elif FD_SETSIZE <= 64
|
|
# define __SELECT_NUINT32 2
|
|
#elif FD_SETSIZE <= 96
|
|
# define __SELECT_NUINT32 3
|
|
#elif FD_SETSIZE <= 128
|
|
# define __SELECT_NUINT32 4
|
|
#elif FD_SETSIZE <= 160
|
|
# define __SELECT_NUINT32 5
|
|
#elif FD_SETSIZE <= 192
|
|
# define __SELECT_NUINT32 6
|
|
#elif FD_SETSIZE <= 224
|
|
# define __SELECT_NUINT32 7
|
|
#elif FD_SETSIZE <= 256
|
|
# define __SELECT_NUINT32 8
|
|
#else
|
|
# warning "Larger fd_set needed"
|
|
#endif
|
|
|
|
/* These macros map a file descriptor to an index and bit number */
|
|
|
|
#define _FD_NDX(fd) ((fd) >> 5)
|
|
#define _FD_BIT(fd) ((fd) & 0x1f)
|
|
|
|
/* Standard helper macros */
|
|
|
|
#ifdef CONFIG_FDCHECK
|
|
# define FD_CLR(fd,set) \
|
|
((((fd_set*)(set))->arr)[_FD_NDX(fdcheck_restore(fd))] &= ~(UINT32_C(1)<< _FD_BIT(fdcheck_restore(fd))))
|
|
# define FD_SET(fd,set) \
|
|
((((fd_set*)(set))->arr)[_FD_NDX(fdcheck_restore(fd))] |= (UINT32_C(1) << _FD_BIT(fdcheck_restore(fd))))
|
|
# define FD_ISSET(fd,set) \
|
|
(((((fd_set*)(set))->arr)[_FD_NDX(fdcheck_restore(fd))] & (UINT32_C(1) << _FD_BIT(fdcheck_restore(fd)))) != 0)
|
|
#else
|
|
# define FD_CLR(fd,set) \
|
|
((((fd_set*)(set))->arr)[_FD_NDX(fd)] &= ~(UINT32_C(1)<< _FD_BIT(fd)))
|
|
# define FD_SET(fd,set) \
|
|
((((fd_set*)(set))->arr)[_FD_NDX(fd)] |= (UINT32_C(1) << _FD_BIT(fd)))
|
|
# define FD_ISSET(fd,set) \
|
|
(((((fd_set*)(set))->arr)[_FD_NDX(fd)] & (UINT32_C(1) << _FD_BIT(fd))) != 0)
|
|
#endif
|
|
#define FD_ZERO(set) \
|
|
memset((set), 0, sizeof(fd_set))
|
|
|
|
/****************************************************************************
|
|
* Type Definitions
|
|
****************************************************************************/
|
|
|
|
struct fd_set_s
|
|
{
|
|
uint32_t arr[__SELECT_NUINT32];
|
|
};
|
|
|
|
typedef struct fd_set_s fd_set;
|
|
|
|
/****************************************************************************
|
|
* 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);
|
|
|
|
int pselect(int nfds, FAR fd_set *readfds, FAR fd_set *writefds,
|
|
FAR fd_set *exceptfds, FAR const struct timespec *timeout,
|
|
FAR const sigset_t *sigmask);
|
|
|
|
#undef EXTERN
|
|
#if defined(__cplusplus)
|
|
}
|
|
#endif
|
|
|
|
#endif /* __INCLUDE_SYS_SELECT_H */
|