#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