Adjust userland commands for struct inpcb integration

Only kvm users are affected.

PR/56331: Paul Goyette: Add -z option to display 0 instead of ' ' in vmstat.

PR/53906: Paul Ripke: systat(1) vmstat & syscall get
"alternate system clock has died" on terminal resize (SIGWINCH)

allow fractional intervals

PR bin/51204

Add ifstat command to systat.

Imported from FreeBSD

if you change display types, the "Showing %s, refresh every %d seconds."
message is retained, and you can't get rid of it. since it's dispalyed
in inverse, it feels like there's always an error happ

if you change display types, the "Showing %s, refresh every %d seconds."
message is retained, and you can't get rid of it. since it's dispalyed
in inverse, it feels like there's always an error happening (which is
really what the code has -- the above string is displayed via the error()
function.) for several types of key press that largely are just "redraw"
operation (space, ^L, etc.), clear the error string as well.

show more ...

Always use_sysctl in preparation of removing all kvm code.

kill ipsec support which hasn't been working for a long time
(neither for KAME nor for FAST_IPSEC)

Consistently use __dead and __printflike.

Use sysctl to fetch network statistics unless a memory file is specified
on the command line.

Update for ICMP and UDP stats changes.

don't call curses from a signal handler!

Include code to display per system call counts and times.

WARNS=3

Add "df" display to give information about filesystems, available diskspace
and used disk capacity, similar to df(1):

Filesystem Avail Capacity
/0% /10% /20% /30%

Add "df" display to give information about filesystems, available diskspace
and used disk capacity, similar to df(1):

Filesystem Avail Capacity
/0% /10% /20% /30% /40% /50% /60% /70% /80% /90% /100%
/ 359M |XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
/tmp 180M |
/home 146G |XXXXXXXXXXXXXXXX

show more ...

A __attribute__((__noreturn__)) function better be void - gcc correctly
complains at >= -O3 otherwise.

be more descriptive about what failed by printing the errno and the
variable we were trying to fetch.

WRT disk commands, make the man page consistent with the program, and add the
feature I expected.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22365, verified by myself.

mark nlisterr() as 'noreturn'

Make kernel address arg of kvm_ckread() const void * so caller doesn't
need a cast.
(approved by christos)

iostat(8) and systat(8) support for separate read/write disk statistics.
"iostat -x" now shows these (ala linux/solaris), but this is only splitting
the read/write bytes/transactions, not adding any

iostat(8) and systat(8) support for separate read/write disk statistics.
"iostat -x" now shows these (ala linux/solaris), but this is only splitting
the read/write bytes/transactions, not adding any new metrics. "systat
iostat" now has two new commands to switch between combined/separate mode
for both it's numbers & bar modes.

show more ...

Fetch maxslp from the kernel. Only use USPACE if it's defined.

Remove extern variables and functions now declared in dkstats.h.
While here, remove 77 (!) unneed #includes.

More format string cleanup by sommerfeld.