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POSIX_OPENPT(3) Linux Programmer's Manual POSIX_OPENPT(3)
NAME
posix_openpt - open a pseudoterminal device
SYNOPSIS
#include <stdlib.h>
#include <fcntl.h>
int posix_openpt(int flags);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
posix_openpt(): _XOPEN_SOURCE >= 600
DESCRIPTION
The posix_openpt() function opens an unused pseudoterminal 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.
ERRORS
See open(2).
VERSIONS
Glibc support for posix_openpt() has been provided since version 2.2.1.
ATTRIBUTES
Multithreading (see pthreads(7))
The posix_openpt() function is thread-safe.
CONFORMING TO
posix_openpt() is part of the UNIX 98 pseudoterminal support (see
pts(4)). This function is specified in POSIX.1-2001.
NOTES
The posix_openpt() function is a recent invention in POSIX. Some UNIX
implementations that support System V (aka UNIX 98) pseudoterminals
don't have this function, but it is easy to implement:
int
posix_openpt(int flags)
{
return open("/dev/ptmx", flags);
}
Calling posix_openpt() creates a pathname for the corresponding pseu-
doterminal slave device. The pathname of the slave device can be
obtained using ptsname(3). The slave device pathname exists only as
long as the master device is open.
SEE ALSO
open(2), getpt(3), grantpt(3), ptsname(3), unlockpt(3), pts(4), pty(7)
COLOPHON
This page is part of release 3.69 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
http://www.kernel.org/doc/man-pages/.
2014-06-03 POSIX_OPENPT(3)
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