unlockpt - unlock a pseudoterminal master/slave pair
#define _XOPEN_SOURCE #include <stdlib.h> int unlockpt(int fd); Feature Test Macro Requirements for glibc (see feature_test_macros(7)): unlockpt(): Since glibc 2.24: _XOPEN_SOURCE >= 500 || (_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) Glibc 2.23 and earlier: _XOPEN_SOURCE
The unlockpt() function unlocks the slave pseudoterminal device corresponding to the master pseudoterminal referred to by
unlockpt() should be called before opening the slave side of a pseudoterminal.
When successful, unlockpt() returns 0. Otherwise, it returns -1 and sets
fd argument is not a file descriptor open for writing.
fd argument is not associated with a master pseudoterminal.
unlockpt() is provided in glibc since version 2.1.
For an explanation of the terms used in this section, see attributes(7).
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