```
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigprocmask(SIG_BLOCK, [INT CHLD], [], 8) = 0
clone(child_stack=NULL, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, child_tidptr=0x7f6a0f78aa10) = 26253
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
rt_sigaction(SIGCHLD, {sa_handler=0x445810, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6a0f7c50f0}, {sa_handler=0x445810, sa_mask=[], sa_flags=SA_RESTORER|SA_RESTART, sa_restorer=0x7f6a0f7c50f0}, 8) = 0
close(4)                                = 0
read(3,

```