Date: Sun, 01 Nov 2009 23:37:38 +0100 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> To: Ed Schouten <ed@80386.nl> Cc: Kostik Belousov <kostikbel@gmail.com>, svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org, Christian Brueffer <brueffer@freebsd.org> Subject: Re: svn commit: r198768 - head/sbin/mknod Message-ID: <86tyxdj2h9.fsf@ds4.des.no> In-Reply-To: <20091101220533.GL1293@hoeg.nl> (Ed Schouten's message of "Sun, 1 Nov 2009 23:05:33 %2B0100") References: <200911011825.nA1IPBQ2031333@svn.freebsd.org> <20091101184322.GP2147@deviant.kiev.zoral.com.ua> <20091101202242.GK1293@hoeg.nl> <86y6mpj4fs.fsf@ds4.des.no> <20091101220533.GL1293@hoeg.nl>
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Ed Schouten <ed@80386.nl> writes: > > Dag-Erling Sm=C3=B8rgrav <des@des.no> writes: > > identified an individual device handled by that driver. FreeBSD no > > longer makes that distinction; each device has a unique system-wide > > minor number, and the major number is always zero. However, the > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > As pointed out earlier, this is not true. Major numbers can be non-zero. > > | #define major(x) ((int)(((u_int)(x) >> 8)&0xff)) > > Devices 256-511 will have a major number of 1, etc. So: Each device has a unique system-wide device number; the minor number contains the eight least-significant bits, and the major number contains the rest. (device numbers are currently unsigned int; is there a reason not to make them explicitly 32 bits wide, i.e. uint32_t?) > Apart from that, I think there is also a fair amount of overlap with the > COMPATIBILITY section of the same manpage. Yeah, but who reads those? :) DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no
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