Provided by: manpages-dev_3.54-1ubuntu1_all bug

NAME
       unlockpt - unlock a pseudoterminal master/slave pair


SYNOPSIS
       #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
       #include <stdlib.h>

       int unlockpt(int fd);


DESCRIPTION
       The  unlockpt()  function  unlocks  the  slave  pseudoterminal device corresponding to the
       master pseudoterminal referred to by fd.

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


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 pseudoterminal.


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), pty(7)


COLOPHON
       This  page  is  part of release 3.54 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)