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-.\"	$NetBSD: poll.2,v 1.3 1996/09/07 21:53:08 mycroft Exp $
-.\"	$Id$
-.\"
-.\" Copyright (c) 1996 Charles M. Hannum.  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. All advertising materials mentioning features or use of this software
-.\"    must display the following acknowledgement:
-.\"	This product includes software developed by Charles M. Hannum.
-.\" 4. 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 ``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 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.
-.\"
-.Dd September 7, 1996
-.Dt POLL 2
-.Os
-.Sh NAME
-.Nm poll
-.Nd synchronous I/O multiplexing
-.Sh SYNOPSIS
-.Fd #include <sys/types.h>
-.Fd #include <poll.h>
-.Ft int
-.Fn poll "struct pollfd *fds" "unsigned int nfds" "int timeout"
-.Sh DESCRIPTION
-.Fn Poll
-examines a set of file descriptors to see if some of them are ready for
-I/O.
-The
-.Fa fds
-argument is a pointer to an array of pollfd structures as defined in
-.Aq Pa poll.h
-(shown below).  The
-.Fa nfds
-argument determines the size of the
-.Fa fds
-array.
-.Bd -literal
-struct pollfd {
-    int    fd;       /* file descriptor */
-    short  events;   /* events to look for */
-    short  revents;  /* events returned */
-};
-.Ed
-.Pp
-The fields of
-.Fa struct pollfd
-are as follows:
-.Bl -tag -width XXXrevents
-.It fd
-File descriptor to poll.
-.It events
-Events to poll for.  (See below.)
-.It revents
-Events which may occur.  (See below.)
-.El
-.Pp
-The event bitmasks in
-.Fa events
-and
-.Fa revents
-have the following bits:
-.Bl -tag -width XXXPOLLWRNORM
-.It POLLIN
-Data other than high priority data may be read without blocking.
-.It POLLRDNORM
-Normal data may be read without blocking.
-.It POLLRDBAND
-Data with a non-zero priority may be read without blocking.
-.It POLLPRI
-High priority data may be read without blocking.
-.It POLLOUT
-.It POLLWRNORM
-Normal data may be written without blocking.
-.It POLLWRBAND
-Data with a non-zero priority may be written without blocking.
-.It POLLERR
-An exceptional condition has occured on the device or socket.  This
-flag is always checked, even if not present in the
-.Fa events
-bitmask.
-.It POLLHUP
-The device or socket has been disconnected.  This flag is always
-checked, even if not present in the
-.Fa events
-bitmask.  Note that
-POLLHUP
-and
-POLLOUT
-should never be present in the
-.Fa revents
-bitmask at the same time.
-.It POLLNVAL
-The file descriptor is not open.  This flag is always checked, even
-if not present in the
-.Fa events
-bitmask.
-.El
-.Pp
-If
-.Fa timeout
-is neither zero nor INFTIM (-1), it specifies a maximum interval to
-wait for any file descriptor to become ready, in milliseconds.  If
-.Fa timeout
-is INFTIM (-1), the poll blocks indefinitely.  If
-.Fa timeout
-is zero, then
-.Fn poll
-will return without blocking.
-.Sh RETURN VALUES
-.Fn Poll
-returns the number of descriptors that are ready for I/O, or -1 if an
-error occured.  If the time limit expires,
-.Fn poll
-returns 0.
-If
-.Fn poll
-returns with an error,
-including one due to an interrupted call,
-the
-.Fa fds
-array will be unmodified.
-.Sh COMPATIBILITY
-This implementation differs from the historical one in that a given
-file descriptor may not cause
-.Fn poll
-to return with an error.  In cases where this would have happened in
-the historical implementation (e.g. trying to poll a
-.Xr revoke 2 ed
-descriptor), this implementation instead copies the
-.Fa events
-bitmask to the
-.Fa revents
-bitmask.  Attempting to perform I/O on this descriptor will then
-return an error.  This behaviour is believed to be more useful.
-.Sh ERRORS
-An error return from
-.Fn poll
-indicates:
-.Bl -tag -width Er
-.It Bq Er EFAULT
-.Fa Fds
-points outside the process's allocated address space.
-.It Bq Er EINTR
-A signal was delivered before the time limit expired and
-before any of the selected events occurred.
-.It Bq Er EINVAL
-The specified time limit is negative.
-.El
-.Sh SEE ALSO
-.Xr accept 2 ,
-.Xr connect 2 ,
-.Xr read 2 ,
-.Xr recv 2 ,
-.Xr select 2 ,
-.Xr send 2 ,
-.Xr write 2
-.Sh BUGS
-The distinction between some of the fields in the
-.Fa events
-and
-.Fa revents
-bitmasks is really not useful without STREAMS.  The fields are
-defined for compatibility with existing software.
-.Sh HISTORY
-The
-.Fn poll
-function call appeared in
-.At V .
-This manual page and the core of the implementation was taken from
-.Nx .