rb_file_open_str 2408 ext/zlib/zlib.c     io = rb_file_open_str(filename, mode);
rb_file_open_str  412 include/ruby/intern.h VALUE rb_file_open_str(VALUE, const char*);
rb_file_open_str  522 iseq.c             f = rb_file_open_str(file, "r");