Jim Warner [Thu, 28 Jul 2022 05:00:00 +0000 (00:00 -0500)]
library: refactor flawed function fatal_proc_unmounted
This commit addresses a potentially disastrous flaw in
that fatal_proc_unmounted() function wherein requested
item(s) might not have been returned to the caller yet
were specified at the time of a 'new' or 'reset' call.
The root cause, uncovered by Craig, was due to the old
library look_up_our_self() support function which only
would populate a proc_t with limited 'stat' file data.
This routine will now act the same as all other <pids>
functions which return a stack or stacks. Whatever was
specified with a 'new' or 'reset' will be returned, if
the passed 'return_self' parameter is other than zero.
[ as is so often the case, when flawed code is fixed ]
[ former complexity can be reduced as a side benefit ]
Jim Warner [Thu, 28 Jul 2022 05:00:00 +0000 (00:00 -0500)]
doc: revert mention of limits for fatal_proc_unmounted
With the next commit the fatal_proc_unmounted function
will be refactored to behave as it always should have.
So, a need for the user 'stat' caution will disappear.
Jim Warner [Thu, 28 Jul 2022 05:00:00 +0000 (00:00 -0500)]
library: change misnamed VSIZE_PGS item to VSIZE_BYTES
Gosh this particular flaw originated way back in 2015.
[ that was when we burdened a caller with additional ]
[ responsibilities for 'stacks_alloc', 'stacks_fill' ]
[ and 'stacks_dealloc'. damn implementation details. ]
Craig Small [Wed, 27 Jul 2022 11:12:10 +0000 (21:12 +1000)]
doc: Mention fatal_proc_unmounted limitations
Discovered this while trying to port programs that use the deleted
libprocps function look_up_our_self() which can be found with the
fatal_proc_unmounted() function.
While procps_pids_new() will allow you to specify any items you
care to think of, a subsequent call to fatal_proc_unmounted()
will only fill in the values found in /proc/self/stat.
Added a caveat to the procps_pids manpage pointing out this
limitation.
Jim Warner [Tue, 26 Jul 2022 05:00:00 +0000 (00:00 -0500)]
top: eliminate a potential abend when exiting 'A' mode
In that issue cited below, Tyson Nottingham identified
a potential abend which was associated with 'alternate
display mode' plus that troublesome 'mkVIZrow1' macro.
He also offered a perfectly adequate fix for that bug.
I refer to that macro as troublesome since it's now so
widely used and sometimes (by design) causes 'begtask'
to go negative (invalid). And now I found yet one more
place where it should have been used but wasn't ('f').
It's also troublesome as evidenced by some git history
listed below. Heck, there was even a commit addressing
the same symptoms (alternate display mode abend) which
Tyson suffered. Clearly, the current design is flawed.
So, with those two issues in mind, I've refactored the
approach to maintaining a visible task in the 1st row.
Henceforth, a 'mkVIZrow1' macro will be issued in only
two places: once at startup and after most keystrokes.
Such an approach likely results in additional calls to
the 'window_hlp' routine that aren't really necessary.
But, it provides a cleaner design less prone to errors
in the future. Besides, such additional overhead would
only be incurred when interacting with the user. Thus,
new costs are of no concern and will never be noticed.
Jim Warner [Tue, 26 Jul 2022 05:00:00 +0000 (00:00 -0500)]
doc: make the library API pages a little more readable
Use of the the '.B' and '.BI' man documentation macros
had rendered the three library API pages less readable
than they could be. In addition, sometimes the pointer
indicator and an identifier were separated by a space.
So, this commit will trade those macros for some '.RI'
and '.RB' macros plus treat the pointers consistently.
[ plus we no longer italicize sort 'stacks' brackets ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Craig Small [Mon, 18 Jul 2022 10:51:41 +0000 (20:51 +1000)]
pgrep: Better warning if pidfd_open not implemented
If procps is built on a Linux 5.3+ system then pidwait
is built with pidfd_open(). If that program is run on
a system < 5.3 then it gives an odd generic error.
If we get a ENOSYS from one pid, we will get it for all
the others so its better to explain what happens and terminate.
The man page is updated to note this issue.
This came up due to killall in psmisc using pidfd_send_signal
Jim Warner [Tue, 28 Jun 2022 05:00:00 +0000 (00:00 -0500)]
top: if line editing, account for invisible characters
If we're deleting a character or operating in overtype
mode, we must account for the potential of 'invisible'
characters. When one follows any character about to be
deleted or replaced both multi-byte sequences must go.
Without this change, there exists the possibility that
top might report some error where no error is apparent
to the user. For example, with 'other filtering' (o/O)
the user could see "unrecognized field name 'COMMAND'"
where the quoted column name appears perfectly normal.
Or maybe a sequences like the 'combining acute accent'
gets applied to an existing character instead of being
deleted as one expects when its parent was eliminated.
So, henceforth whenever any character is being deleted
we will now check for a following 'invisible' sequence
then eliminate it along with that preceding character.
[ admittedly, these scenarios are very rare yet they ]
[ may occur, especially when recalling some previous ]
[ multi-byte strings for editing. and, since we will ]
[ be interacting with a user, performance won't be a ]
[ factor so extra checks for a zero wcwidth is fine. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Wed, 22 Jun 2022 05:00:00 +0000 (00:00 -0500)]
top: adapt for modification to 'MEMINFO_MEM_USED' item
With the library change calculating 'MEMINFO_MEM_USED'
top must be tweaked in order to retain the distinction
between non-cached used memory and cached used memory.
[ assuming one of the two graphs are being displayed ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Wed, 22 Jun 2022 05:00:00 +0000 (00:00 -0500)]
library: modify calculation of 'MEMINFO_MEM_USED' item
In an effort to more accurately reflect 'used' memory,
we will now rely on the kernel's estimate of available
memory. Thus, 'MEMINFO_MEM_USED' will be calculated as
just 'MEMINFO_MEM_TOTAL' less 'MEMINFO_MEM_AVAILABLE'.
Reference(s):
. thread leading to agreed upon change
https://www.freelists.org/post/procps/free-regression-due-to-a-different-calculation-of-Used-memory
. where consensus reached
https://www.freelists.org/post/procps/free-regression-due-to-a-different-calculation-of-Used-memory,11
https://www.freelists.org/post/procps/free-regression-due-to-a-different-calculation-of-Used-memory,12
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Thu, 16 Jun 2022 05:00:00 +0000 (00:00 -0500)]
top: adjust some parenthesis for correct '^N' behavior
Some kdeinit tasks have a large environment consisting
mostly of nulls which were then followed by one or two
printable characters. Such strange environments should
not be shown with that 'not applicable' (n/a) notation
even though that first string vector is equal to '\0'.
I thought I had covered such a contingency but, due to
a misplaced right parenthesis, that '^N' bottom window
could see 'n/a' + a bunch of spaces + printable stuff.
Well, that won't happen anymore with this tiny change.
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Mon, 13 Jun 2022 05:00:00 +0000 (00:00 -0500)]
top: enable processing utf8 multi-byte character input
This program was well equipped to properly handle utf8
multi-byte characters - except for one important area!
If users typed any unicode character (shift+ctrl+u) or
pasted a utf-8 multi-byte string as a response to some
input prompt, those characters would simply be ignored
since they would not pass the internal 'isprint' test.
Well, now we can handle such data while preserving all
line editing provisions such as insertions, deletions,
destructive backspace, prior line recall (up/down) and
those all important cursor left plus right arrow keys.
[ we even support overtype mode for multi-byte stuff ]
[ even though our gui emulator will not let us alter ]
[ the cursor as confirmation (as we do at a console) ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Mon, 13 Jun 2022 05:00:00 +0000 (00:00 -0500)]
top: provide for visual hint when overtype mode active
Given that we won't always be able to alter the cursor
shapes (from underscore to block) if in input overtype
mode, this commit will at least provide a visual clue.
[ while this libvte quirk will impact gnome-terminal ]
[ and likely others, we're able to change the cursor ]
[ shape from underscore to block at a linux console. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Mon, 13 Jun 2022 05:00:00 +0000 (00:00 -0500)]
top: avoid premature forced loss of that bottom window
In the commit shown below the bottom window was forced
off if a full screen replacement function was invoked.
It did so by setting Frames_signal after calling those
routines from the keys_global function. However, there
was sometimes a possibility such action was premature.
At least two of those full screen replacement routines
may issue an error message & return without corrupting
the screen. As such, forcing off that bottom window is
totally unnecessary. It therefore should be preserved.
So this commit just moves the setting of Frames_signal
to the full screen replacement routines when possible.
Jim Warner [Thu, 2 Jun 2022 05:00:00 +0000 (00:00 -0500)]
top: provides a new user 'message log' display ability
Messages issued by top will be displayed for only 1.25
seconds. And while this length of time would appear to
be acceptable (given the absence of complaints), there
will be times when a specific message might be missed.
So, this commit offers users the opportunity to recall
up to 10 of the most recent messages that were issued.
[ we'll just exploit top's new bottom window feature ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Craig Small [Tue, 31 May 2022 12:03:22 +0000 (22:03 +1000)]
library: clear rc in procps_loadavg again
During the changes to procps_loadavg I didn't set the initial
value for retval, meaning it was a random number.
It is now correctly intialised to zero.
Craig Small [Tue, 31 May 2022 11:32:03 +0000 (21:32 +1000)]
library: Return -errno not print messages
A library should generally return an error value, rather than
printing to stderr a message. procps_loadavg() had a few things
to change:
It had a global buffer, but we don't call this function over and
over except in tload. It also did had two macros where a plain
fopen() would do the job nicely.
This removed the macro FILE_TO_BUF which was used everywhere in oldlib
but only for loadavg in newlib.
Craig Small [Tue, 31 May 2022 11:10:18 +0000 (21:10 +1000)]
free: better error message if meminfo not available
When /proc is mounted with subset=pid free just gives the
standard cannot create meminfo structure without any hint why.
free now checks the return value and if it is -ENOENT then it
gives more information about the problem.
Jim Warner [Fri, 27 May 2022 05:00:00 +0000 (00:00 -0500)]
top: don't make translatable text subject to a #define
While it is acceptable to make text usage conditional,
one must never make the text itself conditional. After
all, the translators must be presented with all of the
text so the opportunity to translate it is never lost.
[ one wonders who the idiot was that did this anyway ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
If the special bottom 'window' routines remain unaware
of potential multi-byte characters, that heading could
be truncated prematurely and unnecessary blank line(s)
added to the reserved rows at the bottom of a display.
So, in both cases, this patch will now account for any
difference between string lengths and display columns.
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Wed, 25 May 2022 05:00:00 +0000 (00:00 -0500)]
top: rework bottom 'window' logic to reduce redundancy
This patch attempts to reduce the proliferation of the
bottom window support routines by combining the 'misc'
with 'item' functions. Along the way we can now rename
those two 'pick' functions 'menu' while keeping proper
alphabetic order among all the bottom window routines.
Signed-off-by: Jim Warner <james.warner@comcast.net>
Craig Small [Wed, 25 May 2022 11:08:50 +0000 (21:08 +1000)]
build-sys: Give sensible errors if missing pkg-config
pkg-config is used to find various libraries used by procps.
Unfortunately it, or rather automake, give terrible misleading
error messages if pkg-config is not installed.
At ./configure time you get this:
configure: error: ncurses support missing/incomplete (for partial
build use --without-ncurses)
At automake time you get this:
configure.ac:33: error: possibly undefined macro: AC_MSG_ERROR
If this token and others are legitimate, please use m4_pattern_allow.
See the Autoconf documentation.
configure.ac:48: error: possibly undefined macro: AS_IF
configure.ac:113: error: possibly undefined macro: AC_DEFINE
The internet is filled with such wonderful other examples.
This commit does two things:
At autoconf time, check PKG_PREREQ macro is defined which is found in
pkg.m4 and tells us pkg-config has its macros available.
At configure time, check the result of the pkg-config test and error
if it didn't find it.
Now it actually says its missing pkg-config. To be fair, the autoconf
check is "documented" and recommended in pkg.m4 file.
Craig Small [Sat, 21 May 2022 01:06:57 +0000 (11:06 +1000)]
build-sys: Use ncursesw by default
The existing build system would only require wide ncurses for
a wide watch and even if the library was there would not link
anything else to it.
The first issue which #123 made me think of, is if ncursesw
was there and ncurses is not, why not use ncursesw?
A more major issue is if programs such as slabtop are linked
to ncurses, then certain languages will display their text
wrong, as found in #237.
The days of assuming ASCII only is ok are over the build system
now does the following:
1. If ncursesw is available use this for all relevant programs
2. If ncursesw is not but ncurses is, use this instead
3. If you enable 8bit watch and either disable ncurses or
we cannot find ncursesw error at configure time.
Jim Warner [Wed, 18 May 2022 05:00:00 +0000 (00:00 -0500)]
top: extend shift+tab (back_tab) navigation to console
Really, extend shift+tab navigation to only some linux
consoles (or maybe most consoles). However, there were
some consoles where shift+tab always yields just '\t'.
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Wed, 18 May 2022 05:00:00 +0000 (00:00 -0500)]
top: apply a special emphasis with some focus elements
Since top now uses string vectors for two items in the
new focus window (cmdline & environ), there is no real
use for that 'separator' specified at toggle time. So,
this commit will find a new use for what is the space.
Henceforth, when a user is navigating using the tab or
backtab keys, should a strv element with focus contain
embedded space(s), it will be emphasized & highlighted
using the current window's message color (capclr_msg).
Signed-off-by: Jim Warner <james.warner@comcast.net>
Orhun Parmaksız [Thu, 31 Mar 2022 19:36:57 +0000 (22:36 +0300)]
watch: Add --equexit option
This commit adds a new option called `--equexit` which is the opposite
of `--chgexit`. This option makes it possible to exit when the output
of the given command does not change for the given number of cycles.
A download operation could be given as a use-case since `watch` will
exit when the output does not change anymore, in other words, when
the download is completed.
Jim Warner [Tue, 17 May 2022 05:00:00 +0000 (00:00 -0500)]
top: modify 'focus' strv function to display 'n/a' too
This commit just brings that 'bot_focus_strv' function
up to the same standard as the vanilla 'bot_focus_str'
guy. Namely, if there is no cmdline or environ for any
process, that bottom window will now display an 'n/a'.
[ with the nature of those string vectors, it wasn't ]
[ the same simple process found for regular strings. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Tue, 17 May 2022 05:00:00 +0000 (00:00 -0500)]
top: extend 'focus' navigation to shift+tab (back_tab)
Some of those bottom windows grow quite large, as with
the firefox environment. If one is navigating the data
using the tab key, it can be very inconvenient when an
element should be reexamined but that focus has moved.
Therefore, this commit will support the 'back_tab' key
which is a standard combination of the shift+tab keys.
Now a user can easily backup up to any missed element,
assuming a terminal emulator honors that terminfo key.
[ a gui emulator typically will honor the 'back_tab' ]
[ terminfo string, whereas a linux console does not. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Tue, 17 May 2022 05:00:00 +0000 (00:00 -0500)]
top: be more careful with memcpy length specifications
Using 'mempcpy' was a mistake where plain old 'memcpy'
was appropriate. More importantly, the careless length
specified resulted in a SEGV under some circumstances.
[ namely, it occurred under a multi-threaded top and ]
[ the top program itself as focus + CtrlN 'environ'. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Sun, 15 May 2022 05:00:00 +0000 (00:00 -0500)]
top: modify 'Ctrl' bottom window 'str' use with 'strv'
After satisfying increased buffer size in the previous
patch, I decided to improve the highlight accuracy for
both the command lines plus the environment variables.
Since they both may contain elements which themselves
include embedded spaces, to accomplish this goal, one
must trade vanilla strings for string vectors instead.
[ at last such library items have now been justified ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Sun, 15 May 2022 05:00:00 +0000 (00:00 -0500)]
top: needed 'Ctrl' bottom window fixes were discovered
As it turns out, some of the 'environ' strings are big
enough to overrun the initial buffer sizes. And, while
no real harm was done (other than to silently truncate
the output), this patch will increase the buffer size.
While we're at it. we will normalize a few more buffer
declarations along with correcting a couple typos too.
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Fri, 13 May 2022 05:00:00 +0000 (00:00 -0500)]
doc: man page adjusted for response to keyboard inputs
[ and along the way, those 2 newest namespace fields ]
[ are now mentioned under that same 'X' command part ]
[ this commit already changed for improved response. ]
[ they should have been included in the patch below. ]
Jim Warner [Thu, 12 May 2022 05:00:00 +0000 (00:00 -0500)]
top: extend 'Ctrl' bottom window for 'memu' selections
This commit adds a prototype for a potential extension
of that tabbed bottom window capability. It introduces
a 'menu' which then provides for users' selections. It
does not actually do anything meaningful and will only
be enabled with the new #define called 'BOT_PICK_YES'.
[ since it's just a proof of concept, no attempt has ]
[ been made to add the usual NLS translation support ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Thu, 12 May 2022 05:00:00 +0000 (00:00 -0500)]
top: extend 'Ctrl' bottom window for focus via tab key
This commit introduces the 'tab' key which can be used
to highlight individual elements in that bottom 'Ctrl'
window. This can really help when reviewing such data.
[ note, normal ongoing monitoring continues unabated ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Thu, 12 May 2022 05:00:00 +0000 (00:00 -0500)]
top: expand 'Ctrl' bottom window to display other data
This commit adds support for displaying the namespaces
in top's separate bottom 'Ctrl' window. Along the way,
the plumbing is now in place to extend this capability
to other data (if we don't run out of '^' keystrokes).
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Thu, 12 May 2022 05:00:00 +0000 (00:00 -0500)]
top: rename 'Ctrl' bottom window routines and relocate
This patch will just set the stage for the next commit
where we'll be adding the capability to display things
that sometimes may necessitate multiple library items.
In that effort we will be adding several new routines.
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Thu, 5 May 2022 05:00:00 +0000 (00:00 -0500)]
top: turn off the 'Ctrl' bottom window with 1 more key
In that commit shown below, the concept of a corrupted
display was introduced so that 'Ctrl' windows could be
redrawn now that they were made more persistent. Well,
it turns out there is another case where redrawing was
necessary. That is when transitioning between task and
thread modes. So this patch addresses those occasions.
Jim Warner [Thu, 5 May 2022 05:00:00 +0000 (00:00 -0500)]
top: fix a bug from when 'Ctrl' window was made sticky
In the patch referenced below the bottom 'Ctrl' window
was made to remain until it was dismissed by the user.
As such, it required abandoning a 'Cap_nl_clreos' used
when all the terminal rows had not been drawn. Instead
each line had to be cleared individually until the row
reserved for that 'Ctrl' window area had been reached.
Unfortunately, while a 'Cap_nl_clreos' didn't create a
problem for 'batch' mode, a 'Cap_clr_eol' used instead
yielded an unending loop if those rows were limitless.
So, now we will only clear that area when top isn't in
'batch' mode (which should have always been the case).
Jim Warner [Wed, 4 May 2022 05:00:00 +0000 (00:00 -0500)]
top: avoid library shame with refactored 'Ctrl' window
Well darn it, whoever wrote that new library caught me
with my pants down (again?). Shoot, they were not just
down but somehow missing altogether. Here's the story.
Any item from that library supported by dynamic memory
can only be represented in user's stacks exactly once.
Should any string based enumerator be duplicated among
the items array, for any instance beyond the first the
library will return '[ duplicate ENUM ]' for a result.
That's where I lost my pants. While command lines were
given special handling (and never duplicated) I failed
to turn on CGROUPS, SUPGRPS & ENVIRON when testing the
Ctrl-G, Ctrl-U & Ctrl-N keys. If any of those 3 are on
that's when a Ctrl window sees a 'duplicate' notation.
[ and who runs top with such fields displayed anyway ]
In responding to this oops, the internals were changed
quite dramatically & vastly simplified in the process.
More importantly, the 'duplicate' results are no more.
Signed-off-by: Jim Warner <james.warner@comcast.net>
Craig Small [Tue, 3 May 2022 10:33:44 +0000 (20:33 +1000)]
library: cygwin fixes for devname
Change the default name to cons%d
ctty can be used by other systems not just Cygwin so create a define
separate to cygwin for using the ctty function. The autoconf will need
to be updated to check for these specific systems in future.
Thanks to Achim of the Cygwin project for the patches.
Craig Small [Tue, 3 May 2022 10:13:49 +0000 (20:13 +1000)]
library: Use standard major minor macros
I'm not sure why you would roll your own macros for major and minor
while the standard includes have these defined. Using our versions
causes two problems:
- Some systems don't use this format for their minor/major
- If the kernel proc interface becomes a 64-bit number, like
dev_t is in the library, then our macro will need to be changed.
autoconf already had the check and as a bonus for anyone that
puts these definitions in sys/mkdev.h it handles that too.
So this is now the standard way of getting a minor/major number out of a
device id. Examining bits/sysmacros.h showed that their defines are
close to what devname.c had, except it can handle 64-bit numbers.
Craig Small [Tue, 3 May 2022 09:41:00 +0000 (19:41 +1000)]
testsuite: shmget returns an int
Stops the compilier (correctly) complaining:
lib/test_shm.c: In function ‘main’:
lib/test_shm.c:65:23: warning: format ‘%llx’ expects argument of type ‘long long unsigned int’, but argument 2 has type ‘int’ [-Wformat=]
65 | printf("SHMID: %llx\n", shm_id);
| ~~~^ ~~~~~~
| | |
| | int
| long long unsigned int
shm_id is an int which is what shmget() returns.
Strangely pmap has always scanned this in as a llx even though the maps
"inode" column is the same number that shmget() returns.
Jim Warner [Tue, 3 May 2022 05:00:00 +0000 (00:00 -0500)]
top: turn off the 'Ctrl' bottom window after some keys
To complete the implementation of this new feature, we
must address the problem created by any commands which
offer their own full replacement displays. Should that
'Ctrl' bottom window be active, a return from any such
command leaves that lower portion of a terminal blank.
While we could issue a 'TAGGED_TOSS' macro right after
invoking any of those 4 (currently) affected commands,
it is wrong to make them aware of this 'tagged' stuff.
So, I'll opt for a more generalized solution whereby a
notice regarding a corrupted screen is broadcast. Then
the logic already aware of 'tagging' can deal with it.
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Mon, 2 May 2022 05:00:00 +0000 (00:00 -0500)]
top: allow sticky 'Ctrl' bottom window code by #define
After making that new bottom window more persistent, I
decided to offer a build choice for somebody who might
prefer to have the rug pulled out from under him while
reviewing window contents should some target task end.
If 'TAGGED_BRIEF' is defined old behavior is restored.
[ it should be noted, however, that when this define ]
[ is active we'll lose any benefit of onetime update ]
[ for the bottom window. just like with the original ]
[ behavior, it is repainted with every update cycle. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Mon, 2 May 2022 05:00:00 +0000 (00:00 -0500)]
top: trade just 1 'Ctrl' bottom window key association
I grew tired of inadvertently causing a premature exit
from top when all I wanted was to review some process'
environment variables. That 'V' key was just too close
to the 'C' key so the '^V' attempt became one of '^C'.
Well, not any more. Should a user wish to see a task's
environment, it will now require the '^N' combination.
[ it also now places G/U & N/K on a similar diagonal ]
Along the way, lower case Ctrl key combinations on the
help screen were all changed into upper case versions.
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Mon, 2 May 2022 05:00:00 +0000 (00:00 -0500)]
top: make the new 'Ctrl' bottom window behavior sticky
After using this new feature for awhile, I encountered
numerous times when that 'Ctrl' window would disappear
as I was studying the contents. This was caused by the
death of the target task but it made me think that the
window could/should persist until dismissed by a user.
Well, now it will persist until that same Ctrl key has
been struck a 2nd time or a different Ctrl key used to
target another process after positioning it on row #1.
So now, instead of that former 'moving target' type of
approach, this window is more of a 'snapshot' in time.
[ even more significant, perhaps, is the fact that a ]
[ Ctrl window will now be drawn exactly 1 time only, ]
[ instead of being repainted after each delay cycle. ]
[ this will remain true no matter how many intervals ]
[ might elapse while its contents were under review. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
When support for the 'LIBPROC_HIDE_KERNEL' environment
variable was introduced, a deficiency was present that
allowed any rejected proc_t (i.e. a kworker thread) to
preserve the strdup'd 'cmd' value. That residual value
would prevent stat2proc or status2proc from updating a
cmd field with the proper program name for some tasks.
This patch just ensures a proc_t is freshened whenever
it has been rejected due to an active PT->hide_kernel.
[ again thanks to Björn for initiating the extension ]
Reference(s):
. original hide_kernel implementation
commit 2a7ec67ac806d91520f59c384684e2332774368b
. original hide_kernel proposal
https://gitlab.com/procps-ng/procps/-/merge_requests/147
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Sun, 1 May 2022 05:00:00 +0000 (00:00 -0500)]
top: add a program name to 'Ctrl' bottom window header
This minor addition to that new 'Ctrl' feature is more
important than it seems. It's responsible for alerting
yours truly to the 'LIBPROC_HIDE_KERNEL' bug addressed
in the very next commit. All this while, program names
for some tasks would be mysteriously replaced with the
kernel 'kworker' names. However, customary clutter for
the top process display tended to obscure such a fact.
[ and, of course, to notice the problem in the first ]
[ place required one to have the command line toggle ]
[ 'off' or perhaps to toggle its state 'on' & 'off'. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Jim Warner [Sat, 30 Apr 2022 05:00:00 +0000 (00:00 -0500)]
top: add variable width data display without scrolling
There are times when one might want to see some task's
particular variable width data. However, prior to this
commit, the only way was to first turn on a field then
scroll through it via repeated right arrow keystrokes.
[ this also required that field to be displayed last ]
Needless to say, given the potential length of some of
that variable data this could be extremely cumbersome.
Now with this patch, a Ctrl keystroke combination will
create a separate window at the bottom of the terminal
screen where such variable width data is seen in full.
[ the targeted task is the 1st task displayed, which ]
[ is a convention employed in some existing commands ]
[ the targeted data was determined by these Ctrl key ]
[ combinations: CtrlG = ctrl group; CtrlK = cmdline; ]
[ CtrlU = supplementary groups; plus CtrlV = environ ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
Craig Small [Tue, 26 Apr 2022 12:04:05 +0000 (22:04 +1000)]
testsuite: Add check for shared memory
Created a test process test_shm that allocates a shared memory
segment and prints the segment ID. pmap testsuite runs pmap to
check that the segment is found.
The value returned by shmget() is the same value that is printed
in the fifth column /proc/<PID>/maps
Craig Small [Tue, 26 Apr 2022 11:18:03 +0000 (21:18 +1000)]
pmap: Don't reopen stdin for reading file
pmap uses freopen to read /proc/self/maps. There doesn't
seem to be a good reason to do this and if pmap has its
stdin previously closed then it fails.
signal: fix suspending ps when receving SIGTERM or SIGHUP
Call trace:
#0 __lll_lock_wait_private () at
../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:95
#1 0x00007f95c059f9d7 in _L_lock_638 () from /lib64/libc.so.6
#2 0x00007f95c059f8b6 in _nl_expand_alias
#3 0x00007f95c059dad8 in _nl_find_domain
#4 0x00007f95c059d22e in __dcigettext
#5 0x00007f95c059c05f in __GI___dcgettext
#6 0x00000000004032b3 in signal_handler (signo=15) at display.c:54
#7 <signal handler called>
#8 __memcpy_sse2 () at ../sysdeps/x86_64/memcpy.S:104
#9 0x00007f95c05d9934 in __GI__IO_getline_info
#10 0x00007f95c05d99b8 in __GI__IO_getline
#11 0x00007f95c05e2a5d in __GI_fgets_unlocked
#12 0x00007f95c059f478 in read_alias_file
#13 0x00007f95c059f97a in _nl_expand_alias
#14 0x00007f95c059dad8 in _nl_find_domain
#15 0x00007f95c059d22e in __dcigettext
#16 0x00007f95c059c05f in __GI___dcgettext
#17 0x0000000000403a8d in reset_global () at global.c:410
#18 0x0000000000402605 in main at display.c:650
The above call trace happens when the ps process is suspending, and the
signal SIGTERM is sent to the ps process at the same time.
Just cancel the SIGTERM and SIGHUP handler when suspending to prevent
the problem.
Jim Warner [Sun, 24 Apr 2022 05:00:00 +0000 (00:00 -0500)]
top: added provision for autogroup nice (AGNI) changes
When autogroups are active programs such as renice and
nice are basically useless because the nice value will
only affect the target task priority relative to other
processes in the same autogroup. So to accomplish what
we thought of as renice, /proc/<pid>/autogroup must be
changed. Altering a single member in an autogroup will
also affect every other member of that same autogroup.
Since top's renice provision ('r') suffers constraints
like those of the stand alone nice/renice programs, we
will now provide a means to manipulate that nice value
found within some process' /proc/<pid>/autogroup file.
[ to alter this file for other user's tasks requires ]
[ root privileges, as does setting a negative value. ]
[ however, unlike that 'r' command, this new command ]
[ allows raising *and* lowering all positive values. ]
projects / procps-ng / log