unlockpt(3C)							  unlockpt(3C)

NAME    [Toc]    [Back]

     unlockpt -	unlock a pseudo-terminal master/slave pair

SYNOPSIS    [Toc]    [Back]

     #include <stdlib.h>

     int unlockpt(int fildes);

DESCRIPTION    [Toc]    [Back]

     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    [Toc]    [Back]

     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    [Toc]    [Back]

     open(2), grantpt(3C), ptsname(3C)


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