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Date: Fri, 15 Mar 2013 15:18:53 +0100
From: oliver <oliver@first.in-berlin.de>
To: Jeremie Dimino <jdimino@janestreet.com>
Cc: caml-list@inria.fr, ocsigen@inria.fr
Message-ID: <20130315141853.GB4697@siouxsie>
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X-Scanned-By: MIMEDefang_at_IN-Berlin_e.V. on 192.109.42.8
Subject: Re: [Caml-list] BUG in unix.ml (was: strange errors when linking
 lwt.unix)

On Fri, Mar 15, 2013 at 02:16:01PM +0000, Jeremie Dimino wrote:
> On Fri, Mar 15, 2013 at 2:05 PM, oliver <oliver@first.in-berlin.de> wrote:
> >> Try this one:
> >>
> >>     open Unix;;
> >>     let new_mask =  sigprocmask SIG_BLOCK [10] in
> >>     let ic = Unix.open_process_in "sleep 5" in
> >>     Unix.system "sleep 10";;
> >
> > Hahah... works even with empty list :-)
> 
> Of course.  It works even without the sigprocmask.  The default
> disposition for SIGCHLD is "ignore", so if there is no signal handler
> it will just be ignored...

Yes.

But why isn't the default active without calling sigprocmask?

The default should be active by default.
Otherwise, it's not the default.

Ciao,
   Oliver