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sysctl: Remove CTL_NONE and CTL_UNNUMBERED
Now that the sysctl structures no longer have a ctl_name field there is no reason to retain the definitions for CTL_NONE and CTL_UNNUMBERED, or to explain their historic usage. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
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@ -1,22 +0,0 @@
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Except for a few extremely rare exceptions user space applications do not use
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the binary sysctl interface. Instead everyone uses /proc/sys/... with
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readable ascii names.
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Recently the kernel has started supporting setting the binary sysctl value to
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CTL_UNNUMBERED so we no longer need to assign a binary sysctl path to allow
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sysctls to show up in /proc/sys.
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Assigning binary sysctl numbers is an endless source of conflicts in sysctl.h,
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breaking of the user space ABI (because of those conflicts), and maintenance
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problems. A complete pass through all of the sysctl users revealed multiple
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instances where the sysctl binary interface was broken and had gone undetected
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for years.
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So please do not add new binary sysctl numbers. They are unneeded and
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problematic.
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If you really need a new binary sysctl number please first merge your sysctl
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into the kernel and then as a separate patch allocate a binary sysctl number.
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(ebiederm@xmission.com, June 2007)
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@ -15,9 +15,6 @@
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** The kernel will then return -ENOTDIR to any application using
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** the old binary interface.
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**
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** For new interfaces unless you really need a binary number
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** please use CTL_UNNUMBERED.
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**
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****************************************************************
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****************************************************************
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*/
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@ -50,12 +47,6 @@ struct __sysctl_args {
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/* Top-level names: */
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/* For internal pattern-matching use only: */
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#ifdef __KERNEL__
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#define CTL_NONE 0
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#define CTL_UNNUMBERED CTL_NONE /* sysctl without a binary number */
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#endif
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enum
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{
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CTL_KERN=1, /* General kernel info and control */
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