select(8, [3], NULL, NULL, {172, 0}) = ? ERESTARTNOHAND (To be restarted) --- SIGCHLD (Child exited) @ 0 (0) --- sigreturn() = ? (mask now []) rt_sigprocmask(SIG_BLOCK, [CHLD], NULL, 8) = 0 waitpid(14232, 0xbfb45be8, WNOHANG) = 0 waitpid(14233, 0xbfb45be8, WNOHANG) = 0 waitpid(14225, 0xbfb45be8, WNOHANG) = -1 ECHILD (No child processes) ...