Fix readlink anomalies
Noticed minor readlink issues in pidof.c and pwdx.c.
I have fixed them in two separate commits, please see the commit messages for their specific descriptions.
See merge request !5
w would error out if the window size was smaller than 71 or some
other fields through environment grew too big. The code was a little
convoluted as well. The minimum length for command was 3, which is
pretty useless.
This change does the following:
w doesn't care by default the window size
w will adjust the command length up and down, to a minimum of 7
characters.
if the fields don't fit, w will line-wrap each line.
The idea being its better the line-wrap than it is to error out.
References: https://bugs.debian.org/183394
Signed-off-by: Craig Small <csmall@enc.com.au>
If there is a PID wrap-around w will choose the wrong process.
For example:
$ ps x -o pgrp,tpgid,start,tty,cmd | grep pts/3
3834 3834 21:50:26 pts/3 ssh server
4461 4461 21:57:14 pts/2 grep pts/3
23410 3834 21:07:17 pts/3 mutt
26071 3834 Jul 13 pts/3 /bin/bash
w will show the user as:
csmall pts/3 my-laptop:S.1 13Jul15 5:54 1.36s 1.13s /bin/bash
So why?
w scans the process table and has two ways of finding the best match.
#1 match things like terminal,username and process group, find oldest
#2 match utmp pid to process tgid
The problem is that #2 trumped #1, which is fine when your login process
is numerically lower than your other processes. However in this case
26071 is larger and appears later in the readdir() than the correct
process, which is 3834.
The fix is not not overwrite best if it already exists.
Signed-off-by: Craig Small <csmall@enc.com.au>
When a user is taking advantage of the scroll features
it is likely a scrolled vertical position is well past
the first displayable task. That is especially true of
top's forest view ('V') mode where those early systemd
attached processes are generally not very interesting.
As such, should the idle mode toggle ('i') be employed
a distorted display is almost guaranteed because tasks
that have used some cpu, and thus should be displayed,
have already been skipped by virtue of their position.
So this patch temporarily nullifies vertical scrolling
during the period when idle tasks are not being shown.
Signed-off-by: Jim Warner <james.warner@comcast.net>
The function pid_link tries to handle programs which contain very
long paths to their executables. If 1024 bytes are not enough to
contain the path, the loop wants to get more and more space until
the path can fit.
The loop's condition does not fit though.
readlink will never return a value higher than its supplied size
limit, which is "path_alloc_size - 1", therefore the loop-check of
"len == path_alloc_size" will always be false: the loop will never
be repeated.
While at it, the if-condition inside the loop's body can be omitted,
because it is always true.
malloc and realloc could return NULL when no memory is available.
The code doesn't handle errors, so use xmalloc/xrealloc instead.
While at it, sync alloclen's type with len's type, so both are ssize_t.
The previous commit got rid of some but not all the library. The
format of it was a little odd with the library being explicitly
defined instead of letting autoconf do it for you.
Fixes to option parsing in kill, skill, pkill.
Hi,
These are some fixes to how kill, skill and pkill handle parameters in the -SIGNUM form.
The handling was incorrect in kill/skill, it was actually not properly truncating argc/argv before removing the -SIGNUM argument. There were some hacks around the code to work around the bug, but using `kill -1` on its own would end up working as if `kill -1 -1` (which means `kill -HUP <all processes>`) was executed. (Yes, it was painful when I accidentally typed it... more than once.)
I also made `kill` print the usage if it only gets a signal number, but no pids (as in the `kill -1` example.)
And `pkill` had similar code but was using a buggy atoi() to try to parse the signal number, which meant that trailing garbage was accepted, so I corrected that by removing the buggy atoi() and letting the already existing code that already accepted numeric signals do its work as supposed to...
I also wanted to tackle the "pgrp" case where a negative number is passed to kill, causing it to kill a process group. The current code is buggy, for instance `kill -TERM -2345` will kill process group 2 and not process group 2345 as supposed to. It should also be possible to pass it multiple pgrps or a mix of pgrps and pids. It's hard to fix that though, considering how getopt_long() works, so I'll defer that for a second pull request.
I tested this fairly well, both manually and made sure there were no regressions in the test suite, also didn't break `make distcheck`.
Let me know if you have any questions or other remarks...
Cheers!
Filipe
See merge request !3
This commit prevents pkill from accepting something like `-1garbage` as
a SIGHUP. The previous code was using atoi() which does not check for
trailing garbage and would parse the above as 1.
Handling numeric signals in signal_option() is not really necessary,
since signal_name_to_number() will recognize numeric signals and parse
them properly using strtol() and checking for trailing garbage. It also
checks that the numeric signals are in the proper range. So all we need
to do is remove the buggy numeric signal handling here.
Tested with `pkill -1garbage sleep`, after this patch it will complain
that "1" is not a valid option, which is the expected.
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
This makes a command such as `kill -TERM` or `kill -9` fails and prints
usage, instead of silently succeeding.
The behavior is consistent with how `kill` behaves without an explicit
signal, or with the behavior of the `kill` builtin in a shell like bash.
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
Have skill_sig_option sanitize the command line by properly decrementing
*argc after moving the arguments to remove the -signal one.
One bug caused by this issue was when running `kill -1`, then the code
would interpret -1 as both SIGHUP and as process group -1 and send
SIGHUP to all of them. Or `kill -28` which would send SIGWINCH to
process group -2 (in another bug, the -pgid support only accepts a
single digit, fix for that bug will follow.)
This also reverts commit 7610b3128e ("skill: fix command line with
signal") which worked around this bug in `skill` and also removes the
"sigopt" hack which worked around this bug in `kill`.
The skill_sig_option implementation is compatible with signal_option()
from pgrep.c. I plan to factor them out into a single source file in a
follow up commit, to prevent the duplication.
This commit fixes the issues reported above. I also tested the issues
from commit 7610b3128e, `skill -9 -t pts/0` works as expected, also
tried `kill` with -signal and a number of pids and it worked as
expected.
Also tested that `make check` and `make distcheck` keep working.
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
sysctl --system fails when the file /etc/sysctl.conf doesn't
exists. This happens due to wrong check of stat(2) return code.
Reference:
https://www.freelists.org/post/procps/sysctl
Signed-off-by: Craig Small <csmall@enc.com.au>
pwdx doesn't actually use any of the libprocps functions but
it is linked because it is the default. This specific LDADD
removes that unrequired linking.
Please let's stop the nls translation insanity. With a
one time push we can eliminate the dirty tree syndrome
which surfaces with every local build. Later, before a
release, the translations can be updated in final form
then pushed just 1 more time to the gitlab repository.
I'm tired of having to always re-issue this request in
order to circumvent the problem and thus prevent a too
broad commit (not to mention some nasty side effects).
[ bash$ git update-index --assume-unchanged po/??.po ]
Reference(s):
http://www.freelists.org/post/procps/procpsng-translations
Signed-off-by: Jim Warner <james.warner@comcast.net>
With the commit referenced below, the linux version is
no longer available via an external variable. So we'll
eliminate the extra superficial function call employed
at program end as part of a debugging (only) o/p spew.
[ the user will soon be returned to the command line ]
[ & he/she can run their own 'uname -r' if in doubt! ]
Reference(s):
commit 56d9d5e7e7
Signed-off-by: Jim Warner <james.warner@comcast.net>
wish folks (craig) would use these in their .gitconfig
[core]
whitespace = trailing-space, space-before-tab, blank-at-eof
[apply]
whitespace = warn
Signed-off-by: Jim Warner <james.warner@comcast.net>
Added function procps_linux_version() which used to be an
exported integer instead. Also changed the method of obtaining
the linux version (more correctly the os release) to use a specific
procfs entry. This works for both Linux and FreeBSD.
This patch will bring three of our man pages into line
with the recent refactor of the libprocps wchan logic.
[ and also eliminates more damn eol whitespace which ]
[ snuck in our repo with the commit referenced below ]
Reference(s):
http://www.freelists.org/post/procps/WCHAN,11
commit cf4788c28d
Signed-off-by: Jim Warner <james.warner@comcast.net>
This patch was made necessary by those library changes
in support of recently revised/simplified wchan logic.
Reference(s):
http://www.freelists.org/post/procps/WCHAN,11
Signed-off-by: Jim Warner <james.warner@comcast.net>
This patch was made necessary by those library changes
in support of recently revised/simplified wchan logic.
In addition, this commit eliminates a broken alternate
'namelist' provision which was intended to allow users
to specify a System.map file to be used in translating
addresses into function names. But, the real effect of
the now defunct 'N' and '-n' options was to indirectly
force addresses (not names) to be displayed since such
user named map files could not be successfully parsed.
Besides when the required FRAME_POINTER kconfig option
is absent there is no address to translate and when it
is present /proc/PID/wchan is already translated. Thus
an alternate mapping is unnecessary and inappropriate.
[ we'll forgive POSIX for documenting '-n namelist' ]
Reference(s):
http://www.freelists.org/post/procps/WCHAN,11
Signed-off-by: Jim Warner <james.warner@comcast.net>
Several Debian based distributions were recently found
to have omitted a kernel configuration option that had
the effect of rendering /proc/#/stat and /proc/#/wchan
useless for providing any 'sleeping in function' info.
That problem also prompted a reevaluation of the whole
approach to wchan matters which had grown increasingly
complex as our library evolved over the last 13 years.
The net result was a decision to rely on /proc/#/wchan
which arrived along with the 2.5 kernel. This then let
us vastly simplify the internal code plus the external
interface which will benefit both the top and ps pgms.
Reference(s):
http://www.freelists.org/post/procps/WCHAN,11https://lkml.org/lkml/2008/11/6/12https://bugs.debian.org/711592
Signed-off-by: Jim Warner <james.warner@comcast.net>
It doesn't make any sense to have the binary version strings
embedded into the library. The version strings are defined
already either in the Makefile or in include/c.h
[ in addition to the primary 'lxc' business, i found ]
[ numerous apostrophes used instead of that back-tic ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit adds a lxc container name to every proc_t.
If a process is not running in a container, then a '-'
will be provided, making such a field always sortable.
Unlike other proc_t character pointers, lxc containers
will find many duplicate shared values. So rather than
strdup 'em (with a later free required upon reuse), we
try to keep track of those already seen and share that
address among all tasks running within each container.
We rely on the lines in the task's cgroup subdirectory
which may initially seem somewhat unsophisticated. But
the lxc library itself uses a similar approach when it
is called to list active containers. In that case, the
/proc/net/unix directory is parsed for the '/lxc' eye-
catcher, with potential complications from hashed path
and names that are too long (something we don't face).
[ too bad docker abandoned lxc - our commit won't do ]
[ anything for the users of those kind of containers ]
Reference(s):
https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1424253https://bugs.launchpad.net/ubuntu/+source/procps/+bug/1424253
Signed-off-by: Jim Warner <james.warner@comcast.net>
Under a lxc container, the /proc/meminfo 'MemFree' and
'MemAvailable' amounts will be equal, unless memory is
being limited via cgroups in which case 'MemAvailable'
could exceed that for 'MemTotal'. And when a container
has been nested, there exist additional memory quirks.
A program might then display used or available amounts
greater than total memory (assuming unsigned honored),
or negative values (should a signed cast be employed).
This anomaly primarily impacted the top and free pgms.
Thus, two simple sanity checks have been introduced to
avoid any illogical kb_main_available or kb_main_used.
( Busybox top & free also display anomalous although )
( different results when running in a lxc container. )
Reference(s):
https://bugzilla.redhat.com/show_bug.cgi?id=1153817
Signed-off-by: Jim Warner <james.warner@comcast.net>
On some setups the signals count can change and be truncated. You
will notice this because the number will have "<" prepended. The
testsuite didn't handle this.
You could either get:
BLOCKED BLOCKED BLOCKED CAUGHT
CAUGHT CATCHED
0000000000000000 0000000000000000 0000000000000000 00000001f3d1fef9 00000001f3d1fef9 00000001f3d1fef9
or
BLOCKED BLOCKED BLOCKED CAUGHT CAUGHT CATCHED
00000000 00000000 00000000 <f3d1fef9 <f3d1fef9 <f3d1fef9
ps now truncates usernames and doesn't change them to uids.
Man page is now updated with the correct information
Signed-off-by: Craig Small <csmall@enc.com.au>
testsuite would fail if /proc/vmstat was unreadable.
Issue #3 brought up by Mike Frysinger.
test script explicitly checks to see if it is readable and
sets these tests to unsupported if not.
For the test suite, procps used to use sleep which would just
create a process or two to test the tools against. Some setups
coreutils creates all programs including sleep into one blob which
means a lot of the tests fail, see issue #2
procps has its own sleep program now.
It allows to distinguish the initial NAME (to be translated) with the
latter one (that must not be translated) and thus permits to handle its
translation differently.
References: https://bugs.debian.org/786643
Signed-off-by: Craig Small <csmall@enc.com.au>
Recent commit 9742c74e7c ("pgrep: Enable case-insensitive process matching")
caused the "opts" string to overflow the show 32-character space allocated for
it.
Bump it up to 64 bytes, which should be enough even if more options are added.
Tested: Running ./pgrep stopped crashing and `make check` passed.
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
build-sys: use proper dependencies on libproc.la
Use `LDADD` or `*_LDADD` instead of `AM_LDFLAGS` to refer to `libproc.la`.
This is recommended in the automake manual:
http://www.gnu.org/software/automake/manual/html_node/Linking.html
Before this commit, parallel builds may break, as there is no explicit dependency to ensure the library is built before the binaries that try to link to it.
Tested by running `make -jNN` repeatedly for different levels of parallelism to ensure the build works. Also checked that `make check` and `make distcheck` still work as expected. Also made sure that a parallel make invocation works with `make -j distcheck`.
Reported-by: Jim Warner <james.warner@comcast.net>
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
See merge request !2
Use LDADD or *_LDADD instead of AM_LDFLAGS to refer to libproc.la.
Otherwise, parallel builds will break as there is no explicit dependency
to ensure the library is built before the binaries that try to link to
it.
v2: Added empty rules lib_test_*_LDADD to remove the dependency on
libproc which is not used by the lib/test_* binaries.
Tested by running `make -jNN` repeatedly for different levels of
parallelism to ensure the build works. Also checked that `make check`
and `make distcheck` still work as expected. Also made sure that a
parallel make invocation works with `make -j distcheck`.
Reported-by: Jim Warner <james.warner@comcast.net>
Signed-off-by: Filipe Brandenburger <filbranden@google.com>
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>
