VMS Help CC, Run-time functions, chown  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Changes the owner UIC of a file.

  Syntax:

       #include <unistd.h>

       int chown(const char *file_spec, uid_t owner,
                 gid_t group);  (POSIX-1)

       int chown(const char *file_spec, unsigned int owner,
                 unsigned int group);  (Compatibility)