The procfs mount option subset=pid only shows the processes, not things
such as /proc/stat etc.
For certain programs, this should mean they still work, but have reduced
functionality. This is the first cut at some of them.
pgrep - Removed always loading uptime which we never used anyway. The
program now works fine unless we use --older. Add note in man page
stating it will silently fail.
ps - Load boot time and memory total only when required instead of
always. Changed the error messages to something the user actually
cares about "can't get system boot time" vs "create a structure".
Works for most fields except starts and percent memory.
uptime - Give more useful error messages if uptime not available.
vmstat - move header generation after testing for required proc
files, makes the default output more consistent with the rest
of the options.
References:
procps-ng/procps#227https://www.kernel.org/doc/html/latest/filesystems/proc.html#chapter-4-configuring-procfs6814ef2d99
Signed-off-by: Craig Small <csmall@dropbear.xyz>
You can match or filter on cgroup paths. Currently the match is only
done for version 2 cgroups because these are way simpler as they have
a unified name and always start with "0::".
cgroup v1 can have:
named groups "1:name=myspecialname:"
controllers "9:blkio:"
multiple controllers! "4:cpu,cpuacct:"
So they are very much more complicated from a options parsing and
cgroup matching point of view.
In addition, both my Debian bookworm and bullseye systems use
v2 cgroups.
$ ./pgrep --cgroup /system.slice/cron.service
760
Signed-off-by: Craig Small <csmall@dropbear.xyz>
Based on the command line option, use 'sigqueue'
instead of 'kill' to pass the integer value with
the signal.
References:
procps-ng/procps!32
Signed-off-by: Craig Small <csmall@dropbear.xyz>
Original report:
When trying kill a process with insufficient privileges (see blow),
pkill displays the error message “... failed: Operation not permitted”,
but returns 0. Surely it should return 3?
$ pkill syslogd ; echo $?
pkill: killing pid 373 failed: Operation not permitted
0
Return value 0 means one of more things matched. For a pgrep (which
shares code with pkill) this makes sense, there was a match. It seems
wrong for pkill to return 0 when it in fact could not do what you told
it to. However return value 3 means a fatal error and it's not fatal.
Looking at other programs when trying to kill things it cannot kill.
shell kill returns 1, procps kill returns 1, killall returns 1, skill
returns 0 (and says it was successful!, ah well poor old skill)
The consensus seems to be that you return 1 if you cannot kill it, even
if you found it. In other words the return value for both not found and
not able to kill it is the same.
pkill only returns 0 if something was killed. This means we found a
match AND the kill() system call worked too.
References:
https://bugs.debian.org/852758
Signed-off-by: Craig Small <csmall@enc.com.au>
FreeBSD has case-insensitive matching of processes in pgrep and
pkill, which can be super-useful. This patch uncomments and
documents the code needed to make this work.
Signed-off-by: Craig Small <csmall@enc.com.au>
pgrep got updated due to the confusion of the f,l and a flags.
While the newer behaviour is far better but it is no longer following
the ancient Solaris standards, so that got removed.
References: https://bugs.debian.org/752501
A PID should be specified with --ns:
$ pgrep --ns 12345
which will only match the processes which belong to to the same 6
namespaces. It is also possible to specify which namespaces to test:
$ pgrep --ns 12345 --nslist mnt,net,ipc
which will match processes that belong to the same mount, network and
IPC namespaces as PID 12345.
Signed-off-by: Aristeu Rozanski <arozansk@redhat.com>
The entire tree's polluted with inappropriate trailing
whitespace. This commit rids our environment of all of
those useless keystrokes. Unfortunately, it sure ain't
a permanent solution and requires every contributor to
instruct their editor(s) to prevent or eliminate them.
Plus it's strongly recommended we all insert something
like what's shown below to our '.gitconfig' file so as
to provide at least some warnings when we try to apply
any patches (git am) that do contain the #@!%& things!
References(s):
~/.gitconfig excerpt ---------------------------------
[core]
whitespace = trailing-space, space-before-tab, blank-at-eof
[apply]
whitespace = warn
--------------------------------- ~/.gitconfig excerpt
Signed-off-by: Jim Warner <james.warner@comcast.net>
Possibly by a side-effect but pkill -c option used to work which would
print the number of killed processes. This small change restores this
functionality.
Bug-Debian: http://bugs.debian.org/693783
Signed-off-by: Craig Small <csmall@enc.com.au>
pgrep used delimiter and delimeter, the correct spelling is delimiter.
Thanks to Alexander Kobel for the heads-up.
Signed-off-by: Craig Small <csmall@enc.com.au>
Long option '--list-name' is fixed to be bold, and '-n, --newest'
are marked to new paragraph.
Bug-Debian: http://bugs.debian.org/665425
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
All warnings where about unnecessary quoting. The scriptlet
below will tell what was wrong.
for I in ./top/top.1 ./ps/ps.1 ./*.[0-9]; do
echo "== $I warnings =="
man --warnings=all $I > /dev/null
done
This should probably be turned to 'make check' script.
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
The short option for --inverse is disabled for pkill, but long option
works just in case someone will find that piece of functionality usable.
Bug-Debian: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=558044#67
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
The option -v does not make much sense in pkill context.
Reported-By: "Jason A. Spiro" <jasonspiro4@gmail.com>
Bug-Debian: http://bugs.debian.org/558044
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
