mmap breakage?

Poul-Henning Kamp phk at
Fri Apr 2 11:14:36 PST 2004

In message <20040402191254.GK26131 at>, Alfred Perlstein writes:
>* Poul-Henning Kamp <phk at> [040402 10:40] wrote:
>> In message <20040402160959.GJ26131 at>, Alfred Perlstein writes:
>> >I noticed that mplayer seems to want to open /dev/zero with RDONLY
>> >but then tries to mmap it PROT_READ+PROT_WRITE and gets rejected.
>> Sounds like missing MAP_PRIVATE ?
>Nope, private is set.  It's just that the file is opened RDONLY,
>but PROT has PROT_WRITE in it.

That should be OK with MAP_PRIVATE as far as I interpret POLA.

Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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