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Re: does gconv issue system calls ?

From: Pierre Habouzit <madcoder at debian dot org>
To: Metuki Sabhe <sabhe dot metuki at gmail dot com>
Cc: libc-alpha at sourceware dot org
Date: Sat, 12 Jan 2008 01:23:02 +0100
Subject: Re: does gconv issue system calls ?
References: <549992e50801110035n2b46b63dgb03916763aa3fe01@mail.gmail.com>

On Fri, Jan 11, 2008 at 08:35:07AM +0000, Metuki Sabhe wrote:
> hi all...
> 
> I am trying to understand better the internals of glibc,
> and was wondering about the gconv subsystem -
> is it pure user-space work (sounds logical) or does
> it issue system calls (i will be surprised if yes) ?

  It mostly uses read/writes to read files, and uses mmap extensively
too. As it also malloc's, it's possible to use some mmaps from there
too. Also, to achieve thread-safety I _think_ there is some locking,
which could end up calling futex(2). Here are the ones that come to
mind, I probably miss a couple of other things too.

-- 
ÂOÂ  Pierre Habouzit
ÂÂO                                                madcoder@debian.org
OOO                                                http://www.madism.org

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