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From: "Dave Korn" <dave DOT korn AT artimi DOT com>
To: <cygwin AT cygwin DOT com>, <newlib AT sourceware DOT org>
Subject: RE: bug in freopen
Date: Fri, 15 Jul 2005 11:37:54 +0100
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In-Reply-To: <071420052313.28844.42D6F19F0007DD6E000070AC22007340760A050E040D0C079D0A@comcast.net>
Message-ID: <SERRANOE4bAkX9cC02Q0000057b@SERRANO.CAM.ARTIMI.COM>

----Original Message----
>From: Eric Blake
>Sent: 15 July 2005 00:14

> POSIX requires that freopen(NULL, mode, f) reopen f in the new
> mode, and allows implementations the option of not even closing
> f in the first place.  But in cygwin, it is failing with EFAULT, which is
> not even one of the errors allowed by POSIX.
> 
> http://www.opengroup.org/susv3xsh/freopen.html
> 
> #include <stdio.h>
> #include <errno.h>
> int main(void)
> {
>    FILE* f = freopen (NULL, "rb", stdin); /* Ensure that stdin is binary
>    */ printf ("file is %s, errno %d:%s\n", f ? "good" : "null", errno,
>            strerror(errno));
>    return 0;
> }
> 
> CVS coreutils recently switched to this idiom, replacing its former
> use of the nonstandard <io.h> and setmode() with something
> that is required by the standards.  But until this bug is fixed, CVS
> coreutils will not work with cygwin.  The strace in cygwin shows
> that newlib tried to perform open(NULL), which is the cause of
> the EFAULT.


  I could take a look at this over the weekend if nobody gets to it first :)


    cheers,
      DaveK
-- 
Can't think of a witty .sigline today....


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