unlockpt - unlock a pseudo-terminal master/slave pair
int unlockpt(int fildes);
The function unlockpt() clears a lock flag associated with the slave
pseudo-terminal device associated with its master pseudo-terminal
counterpart so that the slave pseudo-terminal device can be opened.
fildes is a file descriptor returned from a successful open of a master
Upon successful completion, the function unlockpt() returns 0; otherwise
it returns -1. A failure may occur if fildes is not an open file
descriptor or is not associated with a master pseudo-terminal device.
open(2), grantpt(3C), ptsname(3C)
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