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 3.23 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/.
