unlockpt (3)

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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.

CONFORMING TO

POSIX.1-2001.

SEE ALSO

grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)

COLOPHON

This page is part of release 3.54 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/.

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