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-'\" t
-.\" Copyright (c) OpenBSD Group
-.\" All rights reserved.
-.\"
-.\" SPDX-License-Identifier: BSD-3-Clause
-.\"
-.\" Converted into a manpage again by Martin Schulze <joey@infodrom.org>
-.\"
-.\" Added -lutil remark, 030718
-.\"
-.TH openpty 3 2023-10-31 "Linux man-pages 6.7"
-.SH NAME
-openpty, login_tty, forkpty \- terminal utility functions
-.SH LIBRARY
-System utilities library
-.RI ( libutil ", " \-lutil )
-.SH SYNOPSIS
-.nf
-.B #include <pty.h>
-.P
-.BI "int openpty(int *" amaster ", int *" aslave ", char *" name ,
-.BI "              const struct termios *" termp ,
-.BI "              const struct winsize *" winp );
-.BI "pid_t forkpty(int *" amaster ", char *" name ,
-.BI "              const struct termios *" termp ,
-.BI "              const struct winsize *" winp );
-.P
-.B #include <utmp.h>
-.P
-.BI "int login_tty(int " fd );
-.fi
-.SH DESCRIPTION
-The
-.BR openpty ()
-function finds an available pseudoterminal and returns file descriptors
-for the master and slave in
-.I amaster
-and
-.IR aslave .
-If
-.I name
-is not NULL, the filename of the slave is returned in
-.IR name .
-If
-.I termp
-is not NULL, the terminal parameters of the slave will be set to the
-values in
-.IR termp .
-If
-.I winp
-is not NULL, the window size of the slave will be set to the values in
-.IR winp .
-.P
-The
-.BR login_tty ()
-function prepares for a login on the terminal
-referred to by the file descriptor
-.I fd
-(which may be a real terminal device, or the slave of a pseudoterminal as
-returned by
-.BR openpty ())
-by creating a new session, making
-.I fd
-the controlling terminal for the calling process, setting
-.I fd
-to be the standard input, output, and error streams of the current
-process, and closing
-.IR fd .
-.P
-The
-.BR forkpty ()
-function combines
-.BR openpty (),
-.BR fork (2),
-and
-.BR login_tty ()
-to create a new process operating in a pseudoterminal.
-A file descriptor referring to
-master side of the pseudoterminal is returned in
-.IR amaster .
-If
-.I name
-is not NULL, the buffer it points to is used to return the
-filename of the slave.
-The
-.I termp
-and
-.I winp
-arguments, if not NULL,
-will determine the terminal attributes and window size of the slave
-side of the pseudoterminal.
-.SH RETURN VALUE
-If a call to
-.BR openpty (),
-.BR login_tty (),
-or
-.BR forkpty ()
-is not successful, \-1 is returned and
-.I errno
-is set to indicate the error.
-Otherwise,
-.BR openpty (),
-.BR login_tty (),
-and the child process of
-.BR forkpty ()
-return 0, and the parent process of
-.BR forkpty ()
-returns the process ID of the child process.
-.SH ERRORS
-.BR openpty ()
-fails if:
-.TP
-.B ENOENT
-There are no available terminals.
-.P
-.BR login_tty ()
-fails if
-.BR ioctl (2)
-fails to set
-.I fd
-to the controlling terminal of the calling process.
-.P
-.BR forkpty ()
-fails if either
-.BR openpty ()
-or
-.BR fork (2)
-fails.
-.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 forkpty (),
-.BR openpty ()
-T}	Thread safety	MT-Safe locale
-T{
-.na
-.nh
-.BR login_tty ()
-T}	Thread safety	MT-Unsafe race:ttyname
-.TE
-.SH STANDARDS
-BSD.
-.SH HISTORY
-The
-.B const
-modifiers were added to the structure pointer arguments of
-.BR openpty ()
-and
-.BR forkpty ()
-in glibc 2.8.
-.P
-Before glibc 2.0.92,
-.BR openpty ()
-returns file descriptors for a BSD pseudoterminal pair;
-since glibc 2.0.92,
-it first attempts to open a UNIX 98 pseudoterminal pair,
-and falls back to opening a BSD pseudoterminal pair if that fails.
-.SH BUGS
-Nobody knows how much space should be reserved for
-.IR name .
-So, calling
-.BR openpty ()
-or
-.BR forkpty ()
-with non-NULL
-.I name
-may not be secure.
-.SH SEE ALSO
-.BR fork (2),
-.BR ttyname (3),
-.BR pty (7)