rb_file_open_str 3100 ext/zlib/zlib.c     io = rb_file_open_str(filename, mode);
rb_file_open_str  555 include/ruby/intern.h VALUE rb_file_open_str(VALUE, const char*);
rb_file_open_str  829 iseq.c             f = rb_file_open_str(file, "r");