retpid 92 tools/perf/bench/sched-pipe.c pid_t pid, retpid __maybe_unused; retpid 143 tools/perf/bench/sched-pipe.c retpid = waitpid(pid, &wait_stat, 0); retpid 144 tools/perf/bench/sched-pipe.c assert((retpid == pid) && WIFEXITED(wait_stat));