unlockpt(3C)            LIBRARY FUNCTIONS            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 mas-
     ter pseudo-terminal device.

SEE ALSO
     open(2)
     grantpt(3C), ptsname(3C)
     in the Programmer's Guide: STREAMS.































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