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From: amir@smsc.sony.com (Amir 806)
Newsgroups: comp.sys.mips
Subject: Re: mmap
Message-ID: <1991Jun6.022803.16167@smsc.sony.com>
Date: 6 Jun 91 02:28:03 GMT
References: <1991Jun3.151307.20857@watdragon.waterloo.edu> <4210@spim.mips.COM>
Distribution: na
Organization: Sony Microsystems Corp, San Jose, CA
Lines: 28

In article <4210@spim.mips.COM> trevc@mips.com writes:
>In article <1991Jun3.151307.20857@watdragon.waterloo.edu>, drclark@daisy.waterloo.edu (David R. Clark) writes:
>|> The following program (actually a slight variation of it) works on one of
>|> our local systems (Sequent).  On an M2000 running 4.51 the call to mmap fails
>|> (invalid arguments).  Any ideas? ....
>
>RISC/os 4.5x supports only a subset of the mmap and munmap system calls.
>Only mapping of character devices is allowed, and only one device can
>be mapped by a process. 
>What is "AND" in your example?
 
AND is any ordinary file I think.  Anyway, it does fail on our MIPS box.

>RISC/os 5.0 will add memory mapped file functionality that operates in
>accordance with SVR4 semantics.
>
>We hope to start beta testing of RISC/os 5.0 around the end of July.
>

Good.  I just tested this on our SVR4 port and it works fine.



-- 
Amir H. Majidimehr
Operating Systems Group
Sony Microsystems
amir@sony.com  | ...!{uunet,mips}!sonyusa!amir