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



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 mas‐
       ter 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  appropri‐
       ately.

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.

ATTRIBUTES
   Multithreading (see pthreads(7))
       The unlockpt() function is thread-safe.

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 3.74 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 http://www.kernel.org/doc/man-pages/.



                                            2013-12-09                                UNLOCKPT(3)