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



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 3.25 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)