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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 file descriptor (a
nonnegative integer) 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 can be
easily implemented by opening the pseudoterminal multiplexor
device:
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 5.13 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/.
2021-03-22 POSIX_OPENPT(3)
Pages that refer to this page: getpt(3), grantpt(3), ptsname(3), unlockpt(3), org.freedesktop.machine1(5), pty(7)
Copyright and license for this manual page
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