unlockpt(3C)						   Standard C Library Functions 					      unlockpt(3C)

NAME

       unlockpt - unlock a pseudo-terminal master/slave pair

SYNOPSIS

       #include <stdlib.h>

       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.

ERRORS

       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 master pseudo-terminal device.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Safe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       open(2), grantpt(3C), ptsname(3C), attributes(5), standards(5)

       STREAMS Programming Guide

SunOS 5.10							    14 Aug 2002 						      unlockpt(3C)