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Re: [PATCH v2] ftell: seek to end only when there are unflushed bytes (BZ #17647)

From: Siddhesh Poyarekar <siddhesh at redhat dot com>
To: Rich Felker <dalias at libc dot org>
Cc: libc-alpha at sourceware dot org
Date: Wed, 26 Nov 2014 14:26:01 +0530
Subject: Re: [PATCH v2] ftell: seek to end only when there are unflushed bytes (BZ #17647)
Authentication-results: sourceware.org; auth=none
References: <20141125155404 dot GO12197 at spoyarek dot pnq dot redhat dot com> <20141125201415 dot GS29621 at brightrain dot aerifal dot cx>

On Tue, Nov 25, 2014 at 03:14:15PM -0500, Rich Felker wrote:
> I haven't read these patches in detail, but are you sure this matters?
> I think the "active handle" rules forbid truncating a file while a
> stdio stream is the active handle, but I may be mistaken.

Apparently, they don't.  The active handle rules seem to only forbid
operations that modify the file offset and ftruncate does not modify
the file offset.  Instead, ftell ends up modifying the file offset by
explicitly seeking to the end of file when it is not immediately
required, thus breaking expectations of what the offset returned
should be.

Siddhesh

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References:
- [PATCH v2] ftell: seek to end only when there are unflushed bytes (BZ #17647)
  - From: Siddhesh Poyarekar
- Re: [PATCH v2] ftell: seek to end only when there are unflushed bytes (BZ #17647)
  - From: Rich Felker

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