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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
POSIX_OPENPT(3) Linux Programmer's Manual POSIX_OPENPT(3)
posix_openpt - open a pseudoterminal device
#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
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.
On success, posix_openpt() returns a nonnegative file descriptor
which is the lowest numbered unused file descriptor. On failure, -1
is returned, and errno is set to indicate the error.
See open(2).
Glibc support for posix_openpt() has been provided since version
2.2.1.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├───────────────┼───────────────┼─────────┤
│posix_openpt() │ Thread safety │ MT-Safe │
└───────────────┴───────────────┴─────────┘
POSIX.1-2001, POSIX.1-2008.
posix_openpt() is part of the UNIX 98 pseudoterminal support (see
pts(4)).
Some older 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
pseudoterminal 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.
open(2), getpt(3), grantpt(3), ptsname(3), unlockpt(3), pts(4),
pty(7)
This page is part of release 4.12 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
https://www.kernel.org/doc/man-pages/.
2016-03-15 POSIX_OPENPT(3)
Pages that refer to this page: getpt(3), grantpt(3), ptsname(3), unlockpt(3), pty(7)