rb_w32_uaspawn    302 include/ruby/win32.h extern rb_pid_t rb_w32_uaspawn(int, const char *, char *const *);
rb_w32_uaspawn   5748 io.c           #define spawnv(mode, cmd, args) rb_w32_uaspawn((mode), (cmd), (args))
rb_w32_uaspawn   1388 process.c      #define proc_spawn_cmd_internal(argv, prog) rb_w32_uaspawn(P_NOWAIT, (prog), (argv))