ffmpeg and mmap

Andriy Gapon avg at freebsd.org
Sun Dec 12 20:52:15 UTC 2010

on 12/12/2010 22:45 Kostik Belousov said the following:
> On Sun, Dec 12, 2010 at 10:40:12PM +0200, Andriy Gapon wrote:
>> To get around that issue _on Linux_, ffmpeg folks have put explicit
>> _SVID_SOURCE definition right into the libswscale/utils.c file:
>> #define _SVID_SOURCE //needed for MAP_ANONYMOUS
>> For much the same reason we need to add the following for FreeBSD (as
>> hackish as it is): #define __BSD_VISIBLE 1
>> With that addition the code buffer is allocated properly and the code
>> in it can be executed.
> Applications should never define the symbols from reserved namespace,
> in this case __BSD_VISIBLE. Right solution is to not define _POSIX_SOURCE.

i agree with you, but I don't know why the ffmpeg folks decided to use
_POSIX_C_SOURCE=200112 in the first place and what could break without it.

Andriy Gapon

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