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Date: Sun, 19 May 2013 20:09:03 -0400
From: "Z. Gilboa" <zg7s@...rvices.virginia.edu>
To: <musl@...ts.openwall.com>
Subject: Re: patch: make the size of errbuf configurable
On 05/19/2013 07:22 PM, Rich Felker wrote:
> On Sun, May 19, 2013 at 06:26:04PM -0400, Z. Gilboa wrote:
>>>> In my understanding, the current approach of having a fixed buffer
>>>> size is by far the superior one.
>>> Could you elaborate as to why? Are you concerned about memory usage?
>>> Code complexity? Or some other reason?
>> A little bit of both, with complexity being the main factor. As far
>> as I can tell (from looking at dynlink.c and otherwise), there is
>> only one case (do_relocs) where both the library name and symbol
>> name are sent to the buffer. So given the case's rarity and
>> singularity, I would not introduce "complex" code or memory
>> allocation into the function. We should also remember that this is
>> not about how the error is being handled, only about how it is being
>> presented, meaning that less code is probably better...
> From what I can see, complexity can be avoided and maybe even reduced
> by refactoring the code so that all the places that set an error
> message call a short simple function that wraps snprintf and allocates
> a new buffer if needed. The complexity reduction would be if we can
> eliminate duplicate logic at each call point, which I haven't checked
> yet.
>
> Rich
When moving beyond dynlink.c then yes, I believe, that should be
beneficial. I just had a quick look at the places where snprintf is
used, and found that the following functions might benefit from the
above wrapper:
dynlink.c: all functions that call snprintf
syslog.c: _vsyslog
getnameinfo
inet_ntop (unsure)
sem_open (unsure: _name_ can be up to 251 characters long
(http://man7.org/linux/man-pages/man7/sem_overview.7.html), but is link
to _tmp_ which is only up to 64 characters long)
Zvi
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