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List:       busybox
Subject:    Re: [OT] poll() vs. AIO
From:       Laurent Bercot <ska-dietlibc () skarnet ! org>
Date:       2011-08-22 7:55:53
Message-ID: 20110822075553.GA10175 () skarnet ! org
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> Just to note that POSIX does specify sigaction().
> 
> Signal handler set using this will get additional siginfo_t structure
> where you get all that info for SIGCHLD: child's PID, uid, exit code, etc.

 Not all systems support realtime signals though (which are the ones with
a payload in the siginfo_t structure).


> You can also specify SA_NOCLDWAIT so the child is never turned to zombie
> (but you still get the signal with the details), and call to waitpid()
> is not needed.

 Which opens up a race condition: a pid does not identify a unique
process anymore. Until we get to 64-bit pids, SA_NOCLDWAIT should
basically never be used.

-- 
 Laurent
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