Name
posix_openpt — open a pseudo-terminal device
Synopsis
int posix_openpt( |
int flags) ; |
|
Note |
Feature Test Macro Requirements
for glibc (see feature_test_macros(7)): |
posix_openpt (): |
_POSIX_C_SOURCE
>= 200112L || _XOPEN_SOURCE >=
600 |
|
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 nonnegative file descriptor which is the lowest
numbered unused descriptor. On failure, −1 is returned,
and errno
is set to indicate the
error.
VERSIONS
Glibc support for posix_openpt
() has been provided since
version 2.2.1.
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:
COLOPHON
This page is part of release 3.24 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/.
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Copyright (C) 2004 Michael Kerrisk
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