--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21511, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21513, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21512, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21514, si_uid=0, si_status=0, si_utime=0, si_stime=2 /* 0.02 s */} ---
+++ exited with 0 +++