+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#include <sys/resource.h>
+pid_t wait3 (int *, int, struct rusage *);
+pid_t wait4 (pid_t, int *, int, struct rusage *);
+#endif
+
+#define WNOHANG 1
+#define WUNTRACED 2
+
+#define WSTOPPED 2
+#define WEXITED 4
+#define WCONTINUED 8
+#define WNOWAIT 0x1000000
+
+#define __WNOTHREAD 0x20000000
+#define __WALL 0x40000000
+#define __WCLONE 0x80000000
+
+#define P_ALL 0
+#define P_PID 1
+#define P_PGID 2
+
+#define WEXITSTATUS(s) (((s) & 0xff00) >> 8)
+#define WTERMSIG(s) ((s) & 0x7f)
+#define WSTOPSIG(s) WEXITSTATUS(s)
+#define WCOREDUMP(s) ((s) & 0x80)
+#define WIFEXITED(s) (!WTERMSIG(s))
+#define WIFSTOPPED(s) (((s) & 0xff) == 0x7f)
+#define WIFSIGNALED(s) (((signed char) (((s) & 0x7f) + 1) >> 1) > 0)
+#define WIFCONTINUED(s) ((s) == 0xffff)