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Re: [PATCH] libdwfl: Special case linux-gate/vdso.so in core_file_read_eagerly.
- From: Roland McGrath <roland at hack dot frob dot com>
- To: elfutils-devel at lists dot fedorahosted dot org
- Date: Fri, 27 Mar 2015 15:29:25 -0700
- Subject: Re: [PATCH] libdwfl: Special case linux-gate/vdso.so in core_file_read_eagerly.
> In the case we mmap'd the code at the top of the function would already
> have triggered and returned the ELF image because the whole file would
> already been read in/mmap'd in memory. So if we get to the build-id
> check we know that either the file is big and incomplete, or not eagerly
> read in already. It is the second case we want to check for. So the
> core->map_address check should not be moved before the build-id check,
> because we still only want to use the (big) mmap'd (partial) memory when
> no build-id is found.
Please add some comments so this is all clear when reading the code cold.