Standard C Library Functions                         unlockpt(3C)



NAME
     unlockpt - unlock a pseudo-terminal master/slave pair

SYNOPSIS
     #include 

     int unlockpt(int fildes);


DESCRIPTION
     The unlockpt() function unlocks  the  slave  pseudo-terminal
     device associated with the master to which fildes refers.


     Portable applications must call  unlockpt()  before  opening
     the slave side of a pseudo-terminal device.

RETURN VALUES
     Upon successful completion, unlockpt() returns 0. Otherwise,
     it returns -1 and sets errno to indicate the error.

ERORS
     The unlockpt() function may fail if:

     EBADF     The fildes argument is not a file descriptor  open
               for writing.


     EINVAL    The fildes argument is not associated with a  mas-
               ter pseudo-terminal device.


ATRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     
           ATRIBUTE TYPE               ATRIBUTE VALUE       
    
     Interface Stability          Standard                    
    
     MT-Level                     Safe                        
    


SEE ALSO
     open(2),  grantpt(3C),  ptsname(3C),  attributes(5),   stan-
     dards(5)





SunOS 5.11          Last change: 14 Aug 2002                    1






Standard C Library Functions                         unlockpt(3C)



     STREAMS Programming Guide






















































SunOS 5.11          Last change: 14 Aug 2002                    2