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

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

NAME         top

       unlockpt - unlock a pseudoterminal master/slave pair

SYNOPSIS         top

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

       int unlockpt(int fd);

DESCRIPTION         top

       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         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
              pseudoterminal.

VERSIONS         top

       unlockpt() is provided in glibc since version 2.1.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).

       ┌───────────┬───────────────┬─────────┐
       │Interface  Attribute     Value   │
       ├───────────┼───────────────┼─────────┤
       │unlockpt() │ Thread safety │ MT-Safe │
       └───────────┴───────────────┴─────────┘

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008.

SEE ALSO         top

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

COLOPHON         top

       This page is part of release 4.08 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at
       https://www.kernel.org/doc/man-pages/.

                                 2015-08-08                      UNLOCKPT(3)