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/.