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.\" $NetBSD: posix_openpt.3,v 1.4 2008/04/30 13:10:51 martin Exp $
.\"
.\" Copyright (c) 2004 The NetBSD Foundation, Inc.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Christos Zoulas.
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.Dd May 25, 2004
.Dt POSIX_OPENPT 3
.Os
.Sh NAME
.Nm posix_openpt
.Nd open a pseudo-terminal device
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.In fcntl.h
.Ft int
.Fn posix_openpt "int oflag"
.Sh DESCRIPTION
.Fn posix_openpt
Searches for an unused master pseudo-terminal device, opens it, and returns
a file descriptor associated the now used pseudo-terminal device.
The
.Fa oflag
argument has the same meaning as in the
.Xr open 2
call.
.Sh RETURN VALUES
If successful,
.Fn posix_openpt
returns a non-negative integer, which corresponds to a file descriptor
pointing to the master pseudo-terminal device.
Otherwise, a value of \-1 is returned and
.Va errno
is set to indicate the error.
.Sh SEE ALSO
.Xr ioctl 2 ,
.Xr open 2 ,
.Xr grantpt 3 ,
.Xr ptsname 3 ,
.Xr unlockpt 3
.Sh RATIONALE
The standards committee did not want to directly expose the cloning device,
thus decided to wrap the functionality in this function.
The equivalent code would be:
.Bd -literal
	int
	posix_openpt(int oflag) {
		return open("/dev/ptmx", oflag);
	}
.Ed
.Sh STANDARDS
The
.Fn posix_openpt
function conforms to
.St -p1003.1-2001 .