# strace -p 13563
Process 13563 attached
restart_syscall(<... resuming interrupted call ...>) = 0
pipe([3, 4]) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fcd8b088a50) = 24322
close(4) = 0
read(3, "\10\0\0\0", 4) = 4
read(3, "FREEZING", 8) = 8
close(3) = 0
wait4(24322, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 24322
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=24322, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], 0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({1, 0}, 0x7ffdf91fb380) = 0
pipe([3, 4]) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fcd8b088a50) = 24323
close(4) = 0
read(3, "\10\0\0\0", 4) = 4
read(3, "FREEZING", 8) = 8
close(3) = 0
wait4(24323, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 24323
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=24323, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], 0}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({1, 0}, 0x7ffdf91fb380) = 0
pipe([3, 4]) = 0
clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7fcd8b088a50) = 24324
close(4) = 0
read(3, "\10\0\0\0", 4) = 4
read(3, "FREEZING", 8) = 8
close(3) = 0
wait4(24324, [{WIFEXITED(s) && WEXITSTATUS(s) == 0}], 0, NULL) = 24324
--- SIGCHLD {si_signo=SIGCHLD, si_code=CLD_EXITED, si_pid=24324, si_uid=0, si_status=0, si_utime=0, si_stime=0} ---