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POSIX_OPENPT
Section: Linux Programmer's Manual (3)
Updated: 2007-07-26
Index
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NAME
posix_openpt - open a pseudo-terminal 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():
_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.
ERRORS
See
open(2).
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:
int
posix_openpt(int flags)
{
return open("/dev/ptmx", flags);
}
SEE ALSO
open(2),
getpt(3),
grantpt(3),
ptsname(3),
unlockpt(3),
pts(4),
pty(7)
COLOPHON
This page is part of release 3.27 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/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- VERSIONS
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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