/sys$common/syshlp/helplib.hlb CC, Language topics, Predeclared Identifiers, __func__  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The __func__ predeclared identifier evaluates to a static array of
  char, initialized with the spelling of the function's name.  It is
  visible anywhere within the body of a function definition.

  Example:

       void foo(void) {printf("%s\n", __func__);}

  This function prints "foo".