--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21911, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21908, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=21903, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
+++ exited with 0 +++