kern/77355: Detect i*86 subarches for uname
David Schultz
das at FreeBSD.ORG
Sat Feb 12 21:53:46 PST 2005
On Fri, Feb 11, 2005, Bruce Evans wrote:
> It is needed for correctness. From "man uname | col -bx":
>
> %%%
> -m Write the type of the current hardware platform to standard out-
> put.
> ...
> -p Write the type of the machine processor architecture to standard
> output.
> %%%
>
> -p is supposed to give the arch (e.g., -i386) and -m is supposed to
> give the platfrom (is that the sub-arch?) (e.g., i686). It is useless
> for these to return the same string. (i686 is also useless, since it
> is the same for all i386's newer than about 8 years old, but that is
> another bug. The hw.model sysctl gives more useful info (e.g.,
> "AMD Athlon(tm)"), but uname(1) only uses uname(2) which doesn't go
> near this sysctl.)
FWIW, Linux gets this wrong in the other direction (i686 for
both.) Solaris does better. Here are some data points:
das at sygyt:~> uname -a
Linux sygyt 2.4.22-1.2194.nptl #1 Thu Jun 17 10:58:40 EDT 2004 i686 i686 i386 GNU/Linux
das at sygyt:~> uname -m
i686
das at sygyt:~> uname -p
i686
das at VARK:~> uname -a
FreeBSD VARK.MIT.EDU 6.0-CURRENT FreeBSD 6.0-CURRENT #39: Sat Feb 12 04:37:35 EST 2005 das at VARK.MIT.EDU:/usr/home/t/freebsd/vark/usr/home/t/freebsd/vark/src/sys/GENERIC i386
das at VARK:~> uname -m
i386
das at VARK:~> uname -p
i386
athena% uname -a
SunOS biohazard-cafe.mit.edu 5.9 Generic_117171-14 sun4u sparc SUNW,Sun-Fire-V440
athena% uname -m
sun4u
athena% uname -p
sparc
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