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#define _XOPEN_SOURCE /* See feature_test_macros(7) */
int unlockpt(int fd);
The unlockpt() function unlocks the slave pseudoterminal device corre-
sponding to the master pseudoterminal referred to by fd.
unlockpt() should be called before opening the slave side of a pseu-
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.
grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)