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NAME

       unlockpt - unlock a pseudo-terminal master/slave pair

SYNOPSIS

       #define _XOPEN_SOURCE
       #include <stdlib.h>

       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.

VERSIONS

       unlockpt() is provided in glibc since version 2.1.

CONFORMING TO

       POSIX.1-2001.

SEE ALSO

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

COLOPHON

       This page is part of release 3.21 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.

                                  2008-06-14                       UNLOCKPT(3)