unlockpt(3C)
unlock a pseudo-terminal master/slave pair
From the original Amiga UNIX 2.1 manual. Some things it mentions may not be in this release.
NAME
unlockpt - unlock a pseudo-terminal master/slave pair
SYNOPSIS
int unlockpt(int fildes);
DESCRIPTION
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 pseudo-terminal device.
RETURN VALUE
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.
SEE ALSO
open(2) grantpt(3C), ptsname(3C) in the Programmer's Guide: STREAMS.