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poll.h
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poll.h
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/*-
* Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: poll.h,v 1.4 1998/02/03 22:32:23 bde Exp $
*/
#ifndef _SYS_POLL_H_
#define _SYS_POLL_H_
/*
* This file is intended to be compatable with the traditional poll.h.
*/
/*
* This structure is passed as an array to poll(2).
*/
struct pollfd {
int fd; /* which file descriptor to poll */
short events; /* events we are interested in */
short revents; /* events found on return */
};
/*
* Requestable events. If poll(2) finds any of these set, they are
* copied to revents on return.
* XXX Note that FreeBSD doesn't make much distinction between POLLPRI
* and POLLRDBAND since none of the file types have distinct priority
* bands - and only some have an urgent "mode".
* XXX Note POLLIN isn't really supported in true SVSV terms. Under SYSV
* POLLIN includes all of normal, band and urgent data. Most poll handlers
* on FreeBSD only treat it as "normal" data.
*/
#define POLLIN 0x0001 /* any readable data available */
#define POLLPRI 0x0002 /* OOB/Urgent readable data */
#define POLLOUT 0x0004 /* file descriptor is writeable */
#define POLLRDNORM 0x0040 /* non-OOB/URG data available */
#define POLLWRNORM POLLOUT /* no write type differentiation */
#define POLLRDBAND 0x0080 /* OOB/Urgent readable data */
#define POLLWRBAND 0x0100 /* OOB/Urgent data can be written */
/*
* FreeBSD extensions: polling on a regular file might return one
* of these events (currently only supported on UFS).
*/
#define POLLEXTEND 0x0200 /* file may have been extended */
#define POLLATTRIB 0x0400 /* file attributes may have changed */
#define POLLNLINK 0x0800 /* (un)link/rename may have happened */
#define POLLWRITE 0x1000 /* file's contents may have changed */
/*
* These events are set if they occur regardless of whether they were
* requested.
*/
#define POLLERR 0x0008 /* some poll error occurred */
#define POLLHUP 0x0010 /* file descriptor was "hung up" */
#define POLLNVAL 0x0020 /* requested events "invalid" */
#define POLLSTANDARD (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
/*
* Request that poll() wait forever.
* XXX in SYSV, this is defined in stropts.h, which is not included
* by poll.h.
*/
#define INFTIM (-1)
#ifndef KERNEL
#include <sys/cdefs.h>
__BEGIN_DECLS
/*
* XXX logically, poll() should be declared in <poll.h>, but SVR4 at
* least has it here in <sys/poll.h>.
* XXX poll() has "unsigned long" nfds on SVR4, not unsigned as on the
* other BSDs.
*/
int poll __P((struct pollfd *_pfd, unsigned _nfds, int _timeout));
__END_DECLS
#endif /* !KERNEL */
#endif /* !_SYS_POLL_H_ */