NAME¶
unlockpt - unlock a pseudoterminal master/slave pair
SYNOPSIS¶
#define _XOPEN_SOURCE /* See feature_test_macros(7) */
#include <stdlib.h>
int unlockpt(int fd);
DESCRIPTION¶
The
unlockpt() function unlocks the slave pseudoterminal device
corresponding to the master pseudoterminal referred to by
fd.
unlockpt() should be called before opening the slave side of a
pseudoterminal.
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
pseudoterminal.
VERSIONS¶
unlockpt() is provided in glibc since version 2.1.
POSIX.1-2001.
SEE ALSO¶
grantpt(3),
posix_openpt(3),
ptsname(3),
pts(4),
pty(7)
COLOPHON¶
This page is part of release 3.44 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/.