virtual int Sleep(unsigned int) = 0;
virtual int Times(struct tms *timebuf) = 0;
virtual int Wait(int *status) = 0;
+ virtual int Waitpid(int pid, int *status, int flags) = 0;
virtual Sighandler_t Signal(int sig, Sighandler_t subcode) = 0;
#ifdef WIN32
virtual void GetSysMsg(char*& msg, DWORD& dwLen, DWORD dwErr) = 0;