UNLOCKPT
Section: Linux Programmer's Manual (3)
Updated: 2008-06-14
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NAME
unlockpt - unlock a pseudo-terminal master/slave pair
SYNOPSIS
#define _XOPEN_SOURCE
#include <stdlib.h>
int unlockpt(int fd);
DESCRIPTION
The
unlockpt()
function unlocks the slave pseudo-terminal device
(pty) corresponding to the master pty referred to by
fd.
unlockpt()
should be called before opening the slave side of a pty.
RETURN VALUE
When successful,
unlockpt()
returns 0.
Otherwise, it returns -1 and sets
errno
appropriately.
ERRORS
- EBADF
-
The
fd
argument is not a file descriptor open for writing.
- EINVAL
-
The
fd
argument is not associated with a master pty.
VERSIONS
unlockpt()
is provided in glibc since version 2.1.
CONFORMING TO
POSIX.1-2001.
SEE ALSO
grantpt(3),
posix_openpt(3),
ptsname(3),
pts(4),
feature_test_macros(7),
pty(7)
COLOPHON
This page is part of release 3.22 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/.