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Date: Thu, 6 Nov 1997 18:00:02 -0800 (PST)
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From: Bill Fenner <fenner@parc.xerox.com>
Subject: Re: bin/4961: Problems with fseek and fprints 
Reply-To: Bill Fenner <fenner@parc.xerox.com>
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The following reply was made to PR bin/4961; it has been noted by GNATS.

From: Bill Fenner <fenner@parc.xerox.com>
To: tege@pdc.kth.se
Cc: FreeBSD-gnats-submit@freebsd.org
Subject: Re: bin/4961: Problems with fseek and fprints 
Date: Thu, 6 Nov 1997 17:55:52 PST

 tege@pdc.kth.se wrote:
 >1) fseek is ignored on files that were fdopen'ed in append mode.
 
 This is not a bug.  ANSI C says that writes are only allowed at the end
 of file when opening in append mode (e.g. any write has an implicit
 seek to end preceding it).  Open with "r+" if you want to write
 somewhere other than the end of file.
 
 >2) The second fprintf below sets errno even while no error really
 >   happens.
 
 errno is not set on a 2.2.2-RELEASE system; on a 3.0-CURRENT system,
 errno is indeed set to ENOENT.  Interestingly enough, it's the first
 fprintf that's setting errno.  This is definitely worth looking into;
 I have no clue what fprintf might be doing that would cause a ENOENT.
 
   Bill