From: Lawrence Foard (entropy@world.std.com)
Date: 08/08/93 

From: entropy@world.std.com (Lawrence Foard)
Subject: Re: status of mmap(2) in Linux
Date: Sun, 8 Aug 1993 21:21:26 GMT

In article <242qhf$gpv@klaava.helsinki.fi> torvalds@klaava.Helsinki.FI (Linus Torvalds) writes:
>In article <241gc8$d60@samba.oit.unc.edu> ses@sunSITE.unc.edu (Simon Spero) writes:
>>Can anybody tell me the current status of mmap in Linux? Last I heard
>>it only worked for a few special cases, but not for general files. Has this
>>changed, and if so, which kernels is it available in?
>
>In 0.99.11 (and even more so in pl12), the mmap() facility should work
>for all normal files on the "unixy" filesystems (ie minix, ext, ext2,
>xiafs) as long as you don't try to write to a file with mmap() - ie the
>MAP_PRIVATE mappings should be ok (probably MAP_SHARED with just
>PROT_READ is also ok). In fact, pl12 (alpha) uses mmap() internally
>both for normal executables and shared libraries.

Are writable memory mapped files in the works? Or is this what MAP_SHARED
would do? 

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