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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "PIPE" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" pipe 
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.SH NAME
+pipe \- create an interprocess channel
+.SH SYNOPSIS
+.LP
+\fB#include <unistd.h>
+.br
+.sp
+int pipe(int\fP \fIfildes\fP\fB[2]);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIpipe\fP() function shall create a pipe and place two file descriptors,
+one each into the arguments \fIfildes\fP[0] and
+\fIfildes\fP[1], that refer to the open file descriptions for the
+read and write ends of the pipe. Their integer values shall be
+the two lowest available at the time of the \fIpipe\fP() call. The
+O_NONBLOCK and FD_CLOEXEC flags shall be clear on both file
+descriptors. (The \fIfcntl\fP() function can be used to set both these
+flags.)
+.LP
+Data can be written to the file descriptor \fIfildes\fP[1] and read
+from the file descriptor \fIfildes\fP[0]. A read on the
+file descriptor \fIfildes\fP[0] shall access data written to the file
+descriptor \fIfildes\fP[1] on a first-in-first-out basis.
+It is unspecified whether \fIfildes\fP[0] is also open for writing
+and whether \fIfildes\fP[1] is also open for reading.
+.LP
+A process has the pipe open for reading (correspondingly writing)
+if it has a file descriptor open that refers to the read end,
+\fIfildes\fP[0] (write end, \fIfildes\fP[1]).
+.LP
+Upon successful completion, \fIpipe\fP() shall mark for update the
+\fIst_atime\fP, \fIst_ctime\fP, and \fIst_mtime\fP fields
+of the pipe.
+.SH RETURN VALUE
+.LP
+Upon successful completion, 0 shall be returned; otherwise, -1 shall
+be returned and \fIerrno\fP set to indicate the error.
+.SH ERRORS
+.LP
+The \fIpipe\fP() function shall fail if:
+.TP 7
+.B EMFILE
+More than {OPEN_MAX} minus two file descriptors are already in use
+by this process.
+.TP 7
+.B ENFILE
+The number of simultaneously open files in the system would exceed
+a system-imposed limit.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+The wording carefully avoids using the verb "to open" in order to
+avoid any implication of use of \fIopen\fP(); see also \fIwrite\fP()
+\&.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIfcntl\fP(), \fIread\fP(), \fIwrite\fP(), the
+Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<fcntl.h>\fP,
+\fI<unistd.h>\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 .