> There is a bug in the Unix library, which makes my program exit with
> no warning message.
> 
> It happens when I call Unix.write two times on a descriptor closed
> by the other side.

It's not an OCaml bug, it's a Unix feature.  Writes on a socket that
corresponds to a closed connection generates a SIGPIPE signal, whose
default effect is to kill your process.  

There are ways to catch SIGPIPE or to replace it by an error code
generated by Unix.write; please consult a Unix programming guide
(e.g. Steven's books).

- Xavier Leroy
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