poll.h
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上传日期:2009-04-28
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- /* Compatibility definitions for System V `poll' interface.
- Copyright (C) 1994,96,97,98,99,2000,2001,2004 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, write to the Free
- Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
- 02111-1307 USA. */
- #ifndef _SYS_POLL_H
- #define _SYS_POLL_H 1
- #include <features.h>
- /* Get the platform dependent bits of `poll'. */
- #include <bits/poll.h>
- /* Type used for the number of file descriptors. */
- typedef unsigned long int nfds_t;
- /* Data structure describing a polling request. */
- struct pollfd
- {
- int fd; /* File descriptor to poll. */
- short int events; /* Types of events poller cares about. */
- short int revents; /* Types of events that actually occurred. */
- };
- __BEGIN_DECLS
- /* Poll the file descriptors described by the NFDS structures starting at
- FDS. If TIMEOUT is nonzero and not -1, allow TIMEOUT milliseconds for
- an event to occur; if TIMEOUT is -1, block until an event occurs.
- Returns the number of file descriptors with events, zero if timed out,
- or -1 for errors. */
- extern int poll (struct pollfd *__fds, nfds_t __nfds, int __timeout);
- __END_DECLS
- #endif /* sys/poll.h */