Re: Suggested dual human/binary interface for proc/devfs

From: jmcmullan@linuxcare.com
Date: Fri Apr 07 2000 - 23:59:30 EST

H. Peter Anvin <hpa@transmeta.com> wrote:
> I *do* want a unified tool. Unfortunately, I sometimes want that
> unified tool to be snmpd. There is *NO* other reason, and I would like
> the sysctl() system call to go away.

        Why not (assuming we have a string based sysctl_s()) assign
the MIB numbers to strings? Ie, a MIB <-> sysctl_s() database like:

1.2.3.4.1 /kernel/vm/free_pages
1.2.3.4.2 /kernel/vm/swap_max
...
1.2.7.6.2 /kernel/bus/pci
1.2.7.6.2.768.4634.3 /kernel/bus/pci/0300/121A:0003 # Voodoo 3
1.2.7.6.2.?.?.?.1 /kernel/bus/pci/%.4X/%.4X:%.4X/irq # Any PCI device
1.2.7.6.2.?.?.?.2 /kernel/bus/pci/%.4X/%.4X:%.4X/ioport # Any PCI device
...

And the (proposed) sysctl_s would be like:

... C code ...
        int val;
        double parm=4.56;

        sysctl_s("/kernel/vm/free_pages",SYSCTL_GET,&val);

        sysctl_s("/kernel/vm/page_hiwatermark",SYSCTL_SET,&parm);
...

... Shell code ...

$ cat /kernel/vm/free_pages
12
$ echo 4.56 >/kernel/vm/page_hiwatermark 

-- 
Jason McMullan, Senior Linux Consultant, Linuxcare, Inc.
412.422.8077 tel, 412.656.3519 cell, 415.701.0792 fax
jmcmullan@linuxcare.com, http://www.linuxcare.com/
Linuxcare. Support for the revolution.

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