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.
ATTRIBUTES¶
For an explanation of the terms used in this section, see
attributes(7).
Interface |
Attribute |
Value |
unlockpt () |
Thread safety |
MT-Safe |
POSIX.1-2001, POSIX.1-2008.
SEE ALSO¶
grantpt(3),
posix_openpt(3),
ptsname(3),
pts(4),
pty(7)
COLOPHON¶
This page is part of release 4.10 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/.