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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "<poll.h>" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" <poll.h> 
+.SH NAME
+poll.h \- definitions for the poll() function
+.SH SYNOPSIS
+.LP
+\fB#include <poll.h> \fP
+.SH DESCRIPTION
+.LP
+The \fI<poll.h>\fP header shall define the \fBpollfd\fP structure
+that includes at least the following members:
+.sp
+.RS
+.nf
+
+\fBint    fd      \fP The following descriptor being polled. \fB
+short  events  \fP The input event flags (see below). \fB
+short  revents \fP The output event flags (see below). \fB
+\fP
+.fi
+.RE
+.LP
+The \fI<poll.h>\fP header shall define the following type through
+\fBtypedef\fP:
+.TP 7
+\fBnfds_t\fP
+An unsigned integer type used for the number of file descriptors.
+.sp
+.LP
+The implementation shall support one or more programming environments
+in which the width of \fBnfds_t\fP is no greater than the
+width of type \fBlong\fP. The names of these programming environments
+can be obtained using the \fIconfstr\fP() function or the \fIgetconf\fP
+utility.
+.LP
+The following symbolic constants shall be defined, zero or more of
+which may be OR'ed together to form the \fIevents\fP or
+\fIrevents\fP members in the \fBpollfd\fP structure:
+.TP 7
+POLLIN
+Data other than high-priority data may be read without blocking.
+.TP 7
+POLLRDNORM
+Normal data may be read without blocking.
+.TP 7
+POLLRDBAND
+Priority data may be read without blocking.
+.TP 7
+POLLPRI
+High priority data may be read without blocking.
+.TP 7
+POLLOUT
+Normal data may be written without blocking.
+.TP 7
+POLLWRNORM
+Equivalent to POLLOUT.
+.TP 7
+POLLWRBAND
+Priority data may be written.
+.TP 7
+POLLERR
+An error has occurred ( \fIrevents\fP only).
+.TP 7
+POLLHUP
+Device has been disconnected ( \fIrevents\fP only).
+.TP 7
+POLLNVAL
+Invalid \fIfd\fP member ( \fIrevents\fP only).
+.sp
+.LP
+The significance and semantics of normal, priority, and high-priority
+data are file and device-specific.
+.LP
+The following shall be declared as a function and may also be defined
+as a macro. A function prototype shall be provided.
+.sp
+.RS
+.nf
+
+\fBint   poll(struct pollfd[], nfds_t, int);
+\fP
+.fi
+.RE
+.LP
+\fIThe following sections are informative.\fP
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+The System Interfaces volume of IEEE\ Std\ 1003.1-2001, \fIconfstr\fP(),
+\fIpoll\fP(), the Shell and Utilities volume of IEEE\ Std\ 1003.1-2001,
+\fIgetconf\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .