Zero buffers. Seatbelt against sysctl(3) returning non-NUL terminated
string data.

Sync program's usage() with manpage's SYNOPSIS.

Get rid of a NULL dereference when oid is too long.

Reviewed by: keramida
Approved by: grehan (mentor)
MFC after: 1 week

Use correct format string.

Submitted by: ssouhlal

Add a suffix descriptor for the acpi thermal values as a hint for the userland
sysctl tool to print a more readable value for temperatures.

Remove advertising clause from University of California Regent's license,
per letter dated July 22, 1999.

Approved by: core, imp

Add CTLTYPE_QUAD to the list of types for which we don't want an empty
value. All the other numeric types are doing it . . .

Whitespace cleanup.

Add a command-line option to format output for human readability.
Currently, the only effect it has is to print some (but not all) numbers
using thousands separators.

Fix a few style glitches in the previous commit and make the
tunable error message more brief.

Suggested by: bde

Fix a 64 bit warning. Have set_T_dev_t() take a pointer to a size_t rather
than a pointer to an int, since that is what it really wants anyway.

Wrap a long line in the previous commit

Suggested by: njl

Have sysctl print out a more useful error message when it detects that the
user has attempted to write to a read only, tunable value.

Tighten up the string->integer conversion in sysctl(8):

(1) Reject zero-length strings for CTLTYPE_INT, _UINT, _LONG,
_ULONG. Do not silently convert to 0.

(2) When converting CTLTYPE_INT, _UI

Tighten up the string->integer conversion in sysctl(8):

(1) Reject zero-length strings for CTLTYPE_INT, _UINT, _LONG,
_ULONG. Do not silently convert to 0.

(2) When converting CTLTYPE_INT, _UINT, _LONG, and _ULONG, check the
end pointer generated by strtol() and strtoul() rather than
discarding it. Reject the string if either none of the string
was useful for conversion to an integer, or if there was
trailing garbage.

I.e., we will not allow you to set a numeric sysctl to a value unless
we can completely convert the string argument to a numeric value.
I tripped over this when I put the following in /etc/sysctl.conf:

kern.maxfiles="4000"

Ouch.

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Output machdep.guessed_bootdev as an integer rather than try to format
it according to ancient and obsolete rules.

This removes one more user of <sys/diskslice.h>

Fix what I think is an off-by-one in certain worst-case scenarios
caused by rev 1.45. (eg: the estimate being exactly half of the result.)

Cleanup the formatting from the last commit, convert everything to
a more human-readable 'kilobytes' instead of pages.

Make 'sysctl vm.vmtotal' work properly using updated patch from Hiten.
(the patch in the PR was stale).

PR: kern/5689
Submitted by: Hiten Pandya <hiten@unixdaemons.com>

Fix a "bug" in sysctl(8). Limit the length when we print a string from
the kernel rather than ignoring the length and keeping on going till we
finally hit a \0 character in the buffer.

Replace various spelling with FALLTHROUGH which is lint()able

Don't err(3) (and exit prematurely) when a sysctl's object size has
changed, instead just warn(3)

Don't forget to null-terminate string we got from sysctl (f.e. in 'A' format).
Stack garbadge may be printed otherwise.

Take the "tickadj" element out of struct clockinfo. Our adjtime(2)
implementation is being changed and the very concept of tickadj will
no longer be meaningful.

Make the handling of machdep.guessed_bootdev compiled on i386 only.

Export a (machine dependent) kernel variable bootdev as
machdep.guessed_bootdev, and add code to sysctl to parse its value
and give a (not necessarily correct) name to the device we booted
from (the

Export a (machine dependent) kernel variable bootdev as
machdep.guessed_bootdev, and add code to sysctl to parse its value
and give a (not necessarily correct) name to the device we booted
from (the main motivation for this code is to use the info in the
PicoBSD boot scripts, and the impact on the kernel is minimal).

NOTE: the information available in bootdev is not always reliable,
so you should not trust it too much. The parsing code is the same
as in boot2.c, and cannot cover all cases -- as it is, it seems to
work fine with floppies and IDE disks recognised by the BIOS. It
_should_ work as well with SCSI disks recognised by the BIOS.
Booting from a CDROM in floppy emulation will return /dev/fd0 (because
this is what the BIOS tells us).
Booting off the network (e.g. with etherboot) leaves bootdev unset so
the value will be printed as "invalid (0xffffffff)".

Finally, this feature might go away at some point, hopefully when we
have a more reliable way to get the same information.

MFC-after: 5 days

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