rb_w32_uspawn     301 include/ruby/win32.h extern rb_pid_t rb_w32_uspawn(int, const char *, const char*);
rb_w32_uspawn    5749 io.c           #define spawn(mode, cmd) rb_w32_uspawn((mode), (cmd), 0)
rb_w32_uspawn    1286 process.c          rb_w32_uspawn(P_OVERLAY, (char *)str, 0);
rb_w32_uspawn    1436 process.c      #define proc_spawn_sh(str) rb_w32_uspawn(P_NOWAIT, (str), 0)