Unlock a pseudoterminal master/slave pair
#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.
The fd argument is not a file descriptor open for writing.
The fd argument is not associated with a master pseudoterminal.
unlockpt() is provided in glibc since version 2.1.
The unlockpt() function is thread-safe.
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