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UNLOCKPT(3)                Linux Programmer's Manual               UNLOCKPT(3)



 

NAME


       unlockpt - unlock a pseudo-terminal master/slave pair

 

SYNOPSIS


       #define _XOPEN_SOURCE
       #include 

       int unlockpt(int fd);

 

DESCRIPTION






       The  unlockpt() function unlocks the slave pseudo-terminal device (pty)
       corresponding to the master pty referred to by fd.

       unlockpt() should be called before opening the slave side of a pty.

 

RETURN VALUE


       When successful, unlockpt() returns 0. Otherwise,  it  returns  -1  and
       sets errno appropriately.

 

ERRORS


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

       EINVAL The fd argument is not associated with a master pty.

 

CONFORMING TO


       POSIX.1-2001.

 

SEE ALSO


       grantpt(3), posix_openpt(3), ptsname(3), pts(4), pty(7)



PTY Control                       2003-01-30                       UNLOCKPT(3)