UNLOCKPT(3C-SVR4)   RISC/os Reference Manual    UNLOCKPT(3C-SVR4)



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)
     STREAMS Programmer's Guide.































                        Printed 11/19/92                   Page 1