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-.\"     $OpenBSD: posix_openpt.3,v 1.4 2019/01/25 00:19:25 millert Exp $
-.\"
-.\" Copyright (c) 2012 Todd C. Miller <millert@openbsd.org>
-.\"
-.\" Permission to use, copy, modify, and distribute this software for any
-.\" purpose with or without fee is hereby granted, provided that the above
-.\" copyright notice and this permission notice appear in all copies.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.Dd $Mdocdate: January 25 2019 $
-.Dt POSIX_OPENPT 3
-.Os
-.Sh NAME
-.Nm posix_openpt
-.Nd open a pseudo-terminal device
-.Sh SYNOPSIS
-.In stdlib.h
-.In fcntl.h
-.Ft int
-.Fn posix_openpt "int oflag"
-.Sh DESCRIPTION
-The
-.Fn posix_openpt
-function finds the next available pseudo-terminal and returns an open
-file descriptor for its master device.
-The path name of the slave device may be determined via the
-.Fn ptsname
-function.
-Note that the
-.Fn unlockpt
-and
-.Fn grantpt
-functions should be called before opening the slave device.
-.Pp
-The
-.Ar oflag
-argument is formed by bitwise-inclusive
-.Tn OR Ns 'ing
-the following values defined in
-.In fcntl.h :
-.Bl -tag -width O_NOCTTY -offset indent
-.It Dv O_RDWR
-Open for reading and writing.
-.It Dv O_NOCTTY
-Prevent the device from being made the controlling terminal for the session.
-This flag has no effect on
-.Ox
-and is included for compatibility with other systems.
-.El
-.Pp
-The
-.Dv O_RDWR
-flag must be specified in
-.Fa oflag .
-If
-.Fa oflag
-contains values other than those listed above,
-.Fn posix_openpt
-will return an error.
-.Sh RETURN VALUES
-If successful,
-.Fn posix_openpt
-returns a non-negative integer, the file descriptor for the
-pseudo-terminal master device.
-Otherwise, a value of \-1 is returned and
-.Va errno
-is set to indicate the error.
-.Sh ERRORS
-The
-.Fn posix_openpt
-function will fail if:
-.Bl -tag -width Er
-.It Bq Er EMFILE
-The per-process descriptor table is full.
-.It Bq Er ENFILE
-The system file table is full.
-.It Bq Er EINVAL
-The value of
-.Fa oflag
-is not valid.
-.El
-.Sh SEE ALSO
-.Xr ptsname 3 ,
-.Xr pty 4 ,
-.Xr tty 4
-.Sh STANDARDS
-The
-.Fn posix_openpt
-function conforms to
-.St -p1003.1-2001 .
-.Sh HISTORY
-The
-.Fn posix_openpt
-function appeared in
-.Ox 5.3 .