--- /dev/null
+#define WNOHANG 1
+#define WUNTRACED 2
+
+#define WSTOPPED 2
+#define WEXITED 4
+#define WCONTINUED 8
+#define WNOWAIT 0x1000000
+
+#if defined(__XOPEN_SOURCE) || defined(__GNU_SOURCE)
+#define P_ALL 0
+#define P_PID 1
+#define P_PGID 2
+#endif