Name
posix_openpt — open a pseudoterminal device
Synopsis
#include <stdlib.h> #include <fcntl.h>
int
posix_openpt( |
int flags); |
![[Note]](../stylesheet/note.png) |
Note | ||
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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 file descriptor. On failure, −1 is
returned, and errno is set to
indicate the error.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
posix_openpt() |
Thread safety | MT-Safe |
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
posix_openpt() is part of
the UNIX 98 pseudoterminal support (see pts(4)).
NOTES
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.
COLOPHON
This page is part of release 4.07 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/.
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