664a31e496
is an application space macro and the applications are supposed to be free to use it as they please (but cannot). This is consistant with the other BSD's who made this change quite some time ago. More commits to come.
109 lines
4.0 KiB
C
109 lines
4.0 KiB
C
/*-
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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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* $FreeBSD$
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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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