unlockpt (3)

#define _XOPEN_SOURCE       /* See feature_test_macros(7) */

#include <stdlib.h>

int unlockpt(int fd);

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.

When successful, unlockpt() returns 0. Otherwise, it returns -1 and sets errno appropriately.

EBADF

The fd argument is not a file descriptor open for writing.

EINVAL

The fd argument is not associated with a master pseudoterminal.

unlockpt() is provided in glibc since version 2.1.

Multithreading (see pthreads(7))

The unlockpt() function is thread-safe.

POSIX.1-2001.

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

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