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[glibc.git] / io / sys / poll.h
blob9cb60e72eaf9d59e5ee7a1ec9b59ed3c1bfd6a53
1 /* Compatibility definitions for System V `poll' interface.
2 Copyright (C) 1994, 1996, 1997, 1998 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #ifndef _SYS_POLL_H
21 #define _SYS_POLL_H 1
23 #include <features.h>
25 /* Get the platform dependent bits of `poll'. */
26 #include <bits/poll.h>
28 __BEGIN_DECLS
30 /* Data structure describing a polling request. */
31 struct pollfd
33 int fd; /* File descriptor to poll. */
34 short int events; /* Types of events poller cares about. */
35 short int revents; /* Types of events that actually occurred. */
39 /* Poll the file descriptors described by the NFDS structures starting at
40 FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
41 an event to occur; if TIMEOUT is -1, block until an event occurs.
42 Returns the number of file descriptors with events, zero if timed out,
43 or -1 for errors. */
44 extern int __poll __P ((struct pollfd *__fds, unsigned long int __nfds,
45 int __timeout));
46 extern int poll __P ((struct pollfd *__fds, unsigned long int __nfds,
47 int __timeout));
49 __END_DECLS
51 #endif /* sys/poll.h */