Name
posix_openpt — open a pseudo-terminal device
Synopsis
#include <stdlib.h> #include <fcntl.h>
int
posix_openpt( |
int | flags); |
![[Note]](../stylesheet/note.png) |
Note | ||
|---|---|---|---|
|
DESCRIPTION
The posix_openpt() function
opens an unused pseudo-terminal master device, returning a
file descriptor that can be used to refer to that device.
The flags argument
is a bit mask that ORs together zero or more of the following
flags:
O_RDWR-
Open the device for both reading and writing. It is usual to specify this flag.
O_NOCTTY-
Do not make this device the controlling terminal for the process.
RETURN VALUE
On success, posix_openpt()
returns a non-negative file descriptor which is the lowest
numbered unused descriptor. On failure, −1 is returned,
and errno is set to indicate the
error.
CONFORMING TO
posix_openpt() is part of
the Unix98 pseudo-terminal support (see pts(4)). This function is
specified in POSIX.1-2001.
NOTES
This function is a recent invention in POSIX. Some Unix implementations that support System V (aka Unix 98) pseudo-terminals don't have this function, but it is easy to implement:
int posix_openpt(int flags) { return open("/dev/ptmx", flags); }
COLOPHON
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
|
Copyright (C) 2004 Michael Kerrisk Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. |