Another question in the context of SIGCHLD: When I install a SIGCHLD handler via sigaction() using SA_SIGINFO, is it guaranteed that my handler is called (at least) once per death-of-a-child? There is sentence in SUS
If SA_SIGINFO is set in sa_flags, then subsequent occurrences of sig generated by sigqueue() or as a result of any signal-generating function that supports the specification of an application-defined value (when sig is already pending) shall be queued in FIFO order until delivered or accepted; that may cover this but that I don't understand.
