Re: SCO's infringing files list

[Stan Bubrouski <stan@ccs.neu.edu>]

Bruno,

Nice work! How many more files left unexplained?

-sb

On Tue, 2003-12-30 at 09:17, Bruno Haible wrote:
> Here's some info about include/linux/ipc.h, also in SCO's list.
> 
> * lxr.linux.no shows that since version 1.0.9, it had only small incremental
>   changes.
> 
> The earliest copy of this file that I've got is from Krishna
> Balasubramanian's ipcbeta+.tar.Z file. This was his second or third
> beta release of SysV IPC for Linux. The file is here:
> http://www.haible.de/bruno/ipcbeta+.tar.Z
> 
> * The include/linux/ipc.h from ipcbeta+.tar.Z is the same as the one in
>   linux-1.0.9 (http://lxr.linux.no/source/include/linux/ipc.h?v=1.0.9)
> 
> I claim that Krishna Balasubramanian wrote this file.
> 
> * The ipcbeta+.tar.Z contents shows how he developed this thing:
>   He looked at various documentation sources (books, manual pages - remember
>   POSIX didn't specify IPC at that time -).
>   He collected some examples like the "dining philosophers" that were floating
>   around on the net.
>   We ran some test programs on other Unices (SunOS 4, possibly also HP-UX).
>   He wrote 40 KB of documentation, explaining each and every system call.
>   ... and someone who puts so much work in testing and documentation should
>   steal the header file??!
> 
> * The value of IPC_PRIVATE is different in Linux. SysV systems define it as
>   (key_t)0, Linux defines it as ((key_t) 0), which extra parentheses.
> 
> * The members of 'struct ipc_perm' are in different order on Linux.
>   SysV systems have them in the order
>      uid, gid, cuid, cgid, mode, seq, key.
>   Linux has them in the order
>      key, uid, gid, cuid, cgid, mode, seq.
> 
> * The values for IPC_CREAT, IPC_EXCL, IPC_NOWAIT are written as octal numbers,
>   which is quite natural, since 9 bits having the same rwxrwxrwx semantics as
>   file permissions can be ORed into it. SysV systems write these constants
>   with 7 octal digits. Linux ipc.h writes them with 8 octal digits.
> 
> * The values of IPC_RMID, IPC_SET, IPC_STAT are different: on Solaris
>   10, 11, 12; on Linux 0, 1, 2.
> 
> * 'struct ipc_kludge' and the corresponding #defines for SEMOP, SEMGET etc.
>   don't exist in SysV systems. They arose only because we wanted to minimize
>   the number of system calls.
> 
> I hope that's enough evidence that Krishna didn't copy the file's contents
> from anywhere.
> 
> Bruno
> 
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