VMS Help POSIX Threads, PTHREAD routines, pthread_key_getname_np, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 key

    Address of the thread-specific data key object whose object name
    is to be obtained.

 name

    Location to store the obtained object name.

 len

    Length in bytes of buffer at the location specified by name.