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

 attr

    Address of the thread attributes object whose object name
    attribute is to be obtained.

 name

    Location to store the obtained object name.

 len

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

 mbz

    Reserved for future use. The value must be zero (0).