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1026 |
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/*-
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* Copyright (c) 1997 Peter Wemm <peter@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* poll.h,v 1.1 1998/08/19 21:32:11 joel Exp
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*/
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#ifndef _SYS_POLL_H_
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#define _SYS_POLL_H_
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/*
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* This file is intended to be compatable with the traditional poll.h.
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*/
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/*
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* This structure is passed as an array to poll(2).
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*/
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struct pollfd {
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int fd; /* which file descriptor to poll */
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short events; /* events we are interested in */
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short revents; /* events found on return */
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};
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/*
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* Requestable events. If poll(2) finds any of these set, they are
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* copied to revents on return.
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* XXX Note that FreeBSD doesn't make much distinction between POLLPRI
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* and POLLRDBAND since none of the file types have distinct priority
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* bands - and only some have an urgent "mode".
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* XXX Note POLLIN isn't really supported in true SVSV terms. Under SYSV
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* POLLIN includes all of normal, band and urgent data. Most poll handlers
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* on FreeBSD only treat it as "normal" data.
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*/
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#define POLLIN 0x0001 /* any readable data available */
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#define POLLPRI 0x0002 /* OOB/Urgent readable data */
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#define POLLOUT 0x0004 /* file descriptor is writeable */
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#define POLLRDNORM 0x0040 /* non-OOB/URG data available */
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#define POLLWRNORM POLLOUT /* no write type differentiation */
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#define POLLRDBAND 0x0080 /* OOB/Urgent readable data */
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#define POLLWRBAND 0x0100 /* OOB/Urgent data can be written */
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/*
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* FreeBSD extensions: polling on a regular file might return one
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* of these events (currently only supported on UFS).
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*/
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#define POLLEXTEND 0x0200 /* file may have been extended */
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#define POLLATTRIB 0x0400 /* file attributes may have changed */
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#define POLLNLINK 0x0800 /* (un)link/rename may have happened */
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#define POLLWRITE 0x1000 /* file's contents may have changed */
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/*
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* These events are set if they occur regardless of whether they were
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* requested.
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*/
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#define POLLERR 0x0008 /* some poll error occurred */
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#define POLLHUP 0x0010 /* file descriptor was "hung up" */
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#define POLLNVAL 0x0020 /* requested events "invalid" */
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#define POLLSTANDARD (POLLIN|POLLPRI|POLLOUT|POLLRDNORM|POLLRDBAND|\
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POLLWRBAND|POLLERR|POLLHUP|POLLNVAL)
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/*
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* Request that poll() wait forever.
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* XXX in SYSV, this is defined in stropts.h, which is not included
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* by poll.h.
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*/
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#define INFTIM (-1)
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#ifndef KERNEL
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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/*
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* XXX logically, poll() should be declared in <poll.h>, but SVR4 at
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* least has it here in <sys/poll.h>.
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* XXX poll() has "unsigned long" nfds on SVR4, not unsigned as on the
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* other BSDs.
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*/
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int poll __P((struct pollfd *_pfd, unsigned _nfds, int _timeout));
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__END_DECLS
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#endif /* !KERNEL */
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#endif /* !_SYS_POLL_H_ */
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