exec_waitpid      190 exec/exec.h    extern pid_t exec_waitpid (pid_t, int *, int);
exec_waitpid       71 exec/exec1.c   	  pid1 = exec_waitpid (-1, &wstatus, 0);
exec_waitpid       91 exec/test.c          child = exec_waitpid (-1, &sig, 0);