select.h revision d3e64a3f403918abf2cc3f9f0f9a2204a420ec96 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28#ifndef _SYS_SELECT_H_
29#define _SYS_SELECT_H_
30
31#include <sys/cdefs.h>
32#include <sys/time.h>
33#include <sys/types.h>
34#include <signal.h>
35
36__BEGIN_DECLS
37
38#define __FD_SETSIZE 1024
39#define __NFDBITS (8 * sizeof(unsigned long))
40#define __FDSET_LONGS (__FD_SETSIZE/__NFDBITS)
41
42typedef struct {
43  unsigned long fds_bits[__FDSET_LONGS];
44} fd_set;
45
46#define __FDELT(fd) ((fd) / __NFDBITS)
47#define __FDMASK(fd) (1UL << ((fd) % __NFDBITS))
48#define __FDS_BITS(set) (((fd_set*)(set))->fds_bits)
49
50#define __FD_CLR(fd, set) (__FDS_BITS(set)[__FDELT(fd)] &= ~__FDMASK(fd))
51#define __FD_SET(fd, set) (__FDS_BITS(set)[__FDELT(fd)] |= __FDMASK(fd))
52
53#define __FD_ISSET(fd, set) ((__FDS_BITS(set)[__FDELT(fd)] & __FDMASK(fd)) != 0)
54
55#define __FD_ZERO(set) (__builtin_memset(set, 0, sizeof(*(fd_set*)(set))))
56
57extern int select(int, fd_set*, fd_set*, fd_set*, struct timeval*);
58extern int pselect(int n, fd_set* read_fds, fd_set* write_fds, fd_set* err_fds,
59                   const struct timespec * timeout, const sigset_t* sigmask);
60
61__END_DECLS
62
63#endif /* _SYS_SELECT_H_ */
64