unlockpt(3C)                     DG/UX 5.4.2                    unlockpt(3C)


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.


































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