141 lines
4.3 KiB
Groff
141 lines
4.3 KiB
Groff
.\" Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Portions of this software were developed under sponsorship from Snow
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.\" B.V., the Netherlands.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" Portions of this text are reprinted and reproduced in electronic form
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.\" from IEEE Std 1003.1, 2004 Edition, Standard for Information Technology --
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.\" Portable Operating System Interface (POSIX), The Open Group Base
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.\" Specifications Issue 6, Copyright (C) 2001-2004 by the Institute of
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.\" Electrical and Electronics Engineers, Inc and The Open Group. In the
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.\" event of any discrepancy between this version and the original IEEE and
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.\" The Open Group Standard, the original IEEE and The Open Group Standard is
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.\" the referee document. The original Standard can be obtained online at
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.\" http://www.opengroup.org/unix/online.html.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 21, 2016
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.Dt POSIX_OPENPT 2
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.Os
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.Sh NAME
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.Nm posix_openpt
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.Nd "open a pseudo-terminal device"
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In fcntl.h
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.In stdlib.h
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.Ft int
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.Fn posix_openpt "int oflag"
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.Sh DESCRIPTION
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The
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.Fn posix_openpt
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function allocates a new pseudo-terminal and establishes a connection
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with its master device.
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A slave device shall be created in
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.Pa /dev/pts .
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After the pseudo-terminal has been allocated, the slave device should
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have the proper permissions before it can be used (see
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.Xr grantpt 3 ) .
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The name of the slave device can be determined by calling
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.Xr ptsname 3 .
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.Pp
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The file status flags and file access modes of the open file description
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shall be set according to the value of
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.Fa oflag .
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Values for
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.Fa oflag
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are constructed by a bitwise-inclusive OR of flags from the following
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list, defined in
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.In fcntl.h :
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.Bl -tag -width ".Dv O_CLOEXEC"
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.It Dv O_RDWR
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Open for reading and writing.
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.It Dv O_NOCTTY
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If set
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.Fn posix_openpt
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shall not cause the terminal device to become the controlling terminal
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for the process.
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.It Dv O_CLOEXEC
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Set the close-on-exec flag for the new file descriptor.
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.El
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.Pp
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The
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.Fn posix_openpt
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function shall fail when
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.Fa oflag
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contains other values.
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.Sh RETURN VALUES
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Upon successful completion, the
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.Fn posix_openpt
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function shall allocate a new pseudo-terminal device and return a
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non-negative integer representing a file descriptor, which is connected
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to its master device.
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Otherwise, -1 shall be returned and errno set to indicate the error.
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.Sh ERRORS
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The
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.Fn posix_openpt
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function shall fail if:
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.Bl -tag -width Er
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.It Bq Er ENFILE
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The system file table is full.
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.It Bq Er EINVAL
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The value of
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.Fa oflag
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is not valid.
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.It Bq Er EAGAIN
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Out of pseudo-terminal resources.
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.El
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.Sh SEE ALSO
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.Xr ptsname 3 ,
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.Xr pts 4 ,
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.Xr tty 4
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.Sh STANDARDS
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The
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.Fn posix_openpt
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function conforms to
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.St -p1003.1-2001 .
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The ability to use
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.Dv O_CLOEXEC
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is an extension to the standard.
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.Sh HISTORY
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The
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.Fn posix_openpt
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function appeared in
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.Fx 5.0 .
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In
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.Fx 8.0 ,
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this function was changed to a system call.
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.Sh NOTES
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The flag
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.Dv O_NOCTTY
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is included for compatibility; in
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.Fx ,
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opening a terminal does not cause it to become a process's controlling
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terminal.
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.Sh AUTHORS
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.An \&Ed Schouten Aq Mt ed@FreeBSD.org
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