NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | CONFORMING TO | SEE ALSO | COLOPHON

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

NAME         top

       unlockpt - unlock a pseudo-terminal master/slave pair

SYNOPSIS         top

       #define _XOPEN_SOURCE
       #include <stdlib.h>

       int unlockpt(int fd);

DESCRIPTION         top

       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         top

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

ERRORS         top

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

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

VERSIONS         top

       unlockpt() is provided in glibc since version 2.1.

CONFORMING TO         top

       POSIX.1-2001.

SEE ALSO         top

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

COLOPHON         top

       This page is part of release 3.23 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)