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Mail Archives: cygwin/2014/01/14/11:15:30

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From: tednolan AT bellsouth DOT net
To: cygwin AT cygwin DOT com
Subject: Re: fork() + file descriptor bug in 1.7.27(0.271/5/3) 2013-12-09 11:54
In-reply-to: <52D55D96.8070407@redhat.com>
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Comments: In-reply-to Eric Blake <eblake AT redhat DOT com> message dated "Tue, 14 Jan 2014 08:53:58 -0700."
Date: Tue, 14 Jan 2014 10:50:19 -0500
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In message <52D55D96 DOT 8070407 AT redhat DOT com>you write:
>
>Your program may be violating POSIX, which would trigger undefined behavior.
>
>Quoting POSIX:
> pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_05
>

[long quote elided]

Yikes!  That's pretty impenatrable.  And if it says what I think it says,
it seems to violate the way I've understood Unix fork() and how fds 
(and stdio buffers) are inherited since forever.

However..

Do I understand that to say that if the first thing my child does is

	fclose(fp);

everything should be hunky-dory?

Because I just tried that, and it's still not.

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