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-'\" t
-.\" Copyright (C) 2004 Michael Kerrisk
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH posix_openpt 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-posix_openpt \- open a pseudoterminal device
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <stdlib.h>
-.B #include <fcntl.h>
-.P
-.BI "int posix_openpt(int " flags ");"
-.fi
-.P
-.RS -4
-Feature Test Macro Requirements for glibc (see
-.BR feature_test_macros (7)):
-.RE
-.P
-.BR posix_openpt ():
-.nf
-    _XOPEN_SOURCE >= 600
-.fi
-.SH DESCRIPTION
-The
-.BR posix_openpt ()
-function opens an unused pseudoterminal master device, returning a
-file descriptor that can be used to refer to that device.
-.P
-The
-.I flags
-argument is a bit mask that ORs together zero or more of
-the following flags:
-.TP
-.B O_RDWR
-Open the device for both reading and writing.
-It is usual to specify this flag.
-.TP
-.B O_NOCTTY
-Do not make this device the controlling terminal for the process.
-.SH RETURN VALUE
-On success,
-.BR posix_openpt ()
-returns a file descriptor (a nonnegative integer) which is the lowest
-numbered unused file descriptor.
-On failure, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-See
-.BR open (2).
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR posix_openpt ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-glibc 2.2.1.
-POSIX.1-2001.
-.P
-It is part of the UNIX 98 pseudoterminal support (see
-.BR pts (4)).
-.SH NOTES
-Some older UNIX implementations that support System V
-(aka UNIX 98) pseudoterminals don't have this function, but it
-can be easily implemented by opening the pseudoterminal multiplexor device:
-.P
-.in +4n
-.EX
-int
-posix_openpt(int flags)
-{
-    return open("/dev/ptmx", flags);
-}
-.EE
-.in
-.P
-Calling
-.BR posix_openpt ()
-creates a pathname for the corresponding pseudoterminal slave device.
-The pathname of the slave device can be obtained using
-.BR ptsname (3).
-The slave device pathname exists only as long as the master device is open.
-.SH SEE ALSO
-.BR open (2),
-.BR getpt (3),
-.BR grantpt (3),
-.BR ptsname (3),
-.BR unlockpt (3),
-.BR pts (4),
-.BR pty (7)