1/* Compatibility definitions for System V `poll' interface.
2 Copyright (C) 1994-2014 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#ifndef _SYS_POLL_H
20#define _SYS_POLL_H 1
21
22#include <features.h>
23
24/* Get the platform dependent bits of `poll'. */
25#include <bits/poll.h>
26#ifdef __USE_GNU
27/* Get the __sigset_t definition. */
28# include <bits/sigset.h>
29/* Get the timespec definition. */
30# define __need_timespec
31# include <time.h>
32#endif
33
34
35/* Type used for the number of file descriptors. */
36typedef unsigned long int nfds_t;
37
38/* Data structure describing a polling request. */
39struct pollfd
40 {
41 int fd; /* File descriptor to poll. */
42 short int events; /* Types of events poller cares about. */
43 short int revents; /* Types of events that actually occurred. */
44 };
45
46
47__BEGIN_DECLS
48
49/* Poll the file descriptors described by the NFDS structures starting at
50 FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
51 an event to occur; if TIMEOUT is -1, block until an event occurs.
52 Returns the number of file descriptors with events, zero if timed out,
53 or -1 for errors.
54
55 This function is a cancellation point and therefore not marked with
56 __THROW. */
57extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout);
58
59#ifdef __USE_GNU
60/* Like poll, but before waiting the threads signal mask is replaced
61 with that specified in the fourth parameter. For better usability,
62 the timeout value is specified using a TIMESPEC object.
63
64 This function is a cancellation point and therefore not marked with
65 __THROW. */
66extern int ppoll (struct pollfd *__fds, nfds_t __nfds,
67 const struct timespec *__timeout,
68 const __sigset_t *__ss);
69#endif
70
71__END_DECLS
72
73
74/* Define some inlines helping to catch common problems. */
75#if __USE_FORTIFY_LEVEL > 0 && defined __fortify_function
76# include <bits/poll2.h>
77#endif
78
79#endif /* sys/poll.h */
80