--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=17821, si_uid=0, si_status=0, si_utime=0, si_stime=1 /* 0.01 s */} ---
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=17820, si_uid=0, si_status=0, si_utime=0, si_stime=2 /* 0.02 s */} ---
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=17818, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=17819, si_uid=0, si_status=0, si_utime=0, si_stime=4 /* 0.04 s */} ---
+++ exited with 0 +++