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[Tinycc-devel] RE :Re: Use an anonymous file to back mmap


From: Christian JULLIEN
Subject: [Tinycc-devel] RE :Re: Use an anonymous file to back mmap
Date: Fri, 10 Jan 2014 09:37:11 +0100 (CET)

If I recall correctly, MAP_ANONYMOUS is not true POSIX but an extension most un*x system implement yet it is sometime call MAP_ANON.
To be portable, you must detect in ./configure if mmap supports either MAP_ANONYMOUS or MAP_ANON and fallback to /tmp/xxx if none is supported.

Christian


----- Message d'origine -----
De : "Thomas Preud'homme" <address@hidden>
Date ven. 10/01/2014 07:33 (GMT +01:00)
À : "address@hidden" <address@hidden>
Cc : "Keren Tan" <address@hidden>
Objet : Re: [Tinycc-devel] Use an anonymous file to back mmap

Le jeudi 9 janvier 2014, 14:21:59 Keren Tan a écrit :
> Hi All,
>
> I just submitted a tentative patch to the mob branch about mmap. When
> selinux is enabled, tccrun.c uses mmap to hold the dynamically generated
> code/data. It is backed by a randomly named file under /tmp directory. My
> patch is to use an anonymous file in mmap instead, so that the generated
> code/data only resides in memory, and tcc does not depend on a writable
> /tmp anymore.
>
> tcc is fantastic! I am new to this community. Your comments are very
> welcome!

Here is my comment: you removed the line s1->mem_size = ret; which is used to
unmap these memory regions in libtcc.c

>
> http://repo.or.cz/w/tinycc.git/commit/935d8169b8e3570f1a5e726c5295be2f460c15
> 40
>
> Best,
> Keren Tan

Thanks for your patch.

Best regards,

Thomas

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