The library does not weed out potential duplicate PID
values when sampling with the PROC_PID flag. This was
treated as merely an inefficiency by top and safely
ignored prior to the advent of forest view mode.
Now, however, if the -p switch duplicates certain PIDs,
*and* those processes have no PPID, *and* top's forest
view mode is active or activated, then a SEGV will be
generated (and caught).
This rather obscure buglet is thus limited to pid #1
(/sbin/init) and pid #2 (kthreadd). With any other
duplicate PIDs the worse case scenario was a '?' in
place of the usual forest view artwork.
This commit silently ignores any duplicate process ids
and thereby avoids the potential segmemtation fault.
Signed-off-by: Jim Warner <james.warner@comcast.net>
In attempting to keep at least one task visible when
scrolling vertically, a negative task index would be
produced when pid monitoring was in effect and no
matching pid was found.
Since there were already other conditions where no
task might displayed, the faulty source line has been
removed.
Bug-Debian: http://bugs.debian.org/668335
Signed-off-by: Jim Warner <james.warner@comcast.net>
If stream status is not checked at the end of execution below problem
would not report error, or non-zero exit code. The uptime is just an
example same was true with all commands of the project.
$ uptime >&- ; echo $?
uptime: write error: Bad file descriptor
1
$ uptime >/dev/full ; echo $?
uptime: write error: No space left on device
1
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
When top introduced true line input editing, the
ability to paste keystrokes was lost. This remains
a necessary evil so that top has an opportunity to
translate cursor motion keystrokes into terminfo
escapes during line input. Motion keys themselves,
of course, can never be pasted.
If pasting ever became more important than input
editing, then native termios support should have been
available via a define called TERMIOS_ONLY. But a
recent commit, eliminating what was thought to be
obsolete logic, rendered the alternate linein()
function virtually useless.
Similar to top-3.2.8, when native termios input is
functional, these abberations can be experienced:
. cursor motion keys will appear as escapes
. excessive input can cause line wraps
. ^Z during i/p is not be honored until <Enter>
. SIGWINCH during i/p corrupts screen temporarily
In hindsight, it now seems that the ability to paste
keystrokes may indeed outweigh any shortcomings of
native termios support. This is especially true if
one is preparing to search ('L') for some lengthy
process command line contined in the clipboard.
Thus, this patch fixes the alternate linein() function
and changes TERMIOS_ONLY to TERMIO_PROXY so that top
now defaults to using native termios input. In turn,
that will restore the paste keystrokes capability.
Reference(s):
commit: 045538e01b
Reported by: sergio <mailbox@sergio.spb.ru>
Bug-Debian: http://bugs.debian.org/663334
Signed-off-by: Jim Warner <james.warner@comcast.net>
These per instance warnings have been eliminated:
warning: range expressions in switch statements are non-standard
warning: padding struct to align 'winflags'
warning: dereferencing type-punned pointer will break strict-aliasing rules
These per instance warnings have not been addressed
since they simply trade one warning for another:
From:
warning: ISO C does not permit named variadic macros
warning: ISO C does not support the '%Lu' gnu_scanf format
To:
warning: anonymous variadic macros were introduced in C99
warning: ISO C90 does not support the 'll' gnu_scanf length modifier
Lastly, since all C compilers have supported use of
C++ style comments for the past 20 years, the top
program will never trade them for the often more
cumbersome C style comments simply to avoid this
once per source file warning:
warning: C++ style comments are not allowed in ISO C90
Signed-off-by: Jim Warner <james.warner@comcast.net>
Under openSUSE, old top uses additional fields for
out-of-memory reporting. As a result, under the
original approach to rcfile conversion, new top would
issue a fatal corrupt window entry message asking that
the rcfile be deleted.
This patch extends the conversion range to include
the extra openSUSE field characters. It's effective
when ./configure specifies the --enable-oomem option
which in turn defines OOMEM_ENABLE.
This commit also makes the conversion logic slightly
more forgiving. While enforcing an upper limit on the
expected number of old style field characters, amounts
less than that will be handled seemlessly.
Reference:
commit 4b98733132
Signed-off-by: Jim Warner <james.warner@comcast.net>
At one time, new top silently defaulted when an rcfile
was found to be incompatible. This is exactly what
the old top did. However, after some discussion it
was decided top should alert the user and thereby
save the system administrator some headaches.
Now, some are upset over the fatal error, proving you
can't please everybody. But in all fairness, given
the difficulty of customizing old top, any reluctance
to delete an old saved rcfile is understandable.
To ease transition to this new top, old style rcfiles
will now be honored and converted to the new format.
And if not disabled at ./configure time via CFLAGS,
a user will be warned when an old style rcfile is
about to be overwritten using the 'W' command.
Lastly, the config validation logic was enhanced to
help ensure both types of rcfile haven't been edited
manually and possibly made unuseable.
Reported-By: sergio <mailbox@sergio.spb.ru>
Bug-Debian: http://bugs.debian.org/651213
Reported-By: martin f krafft <madduck@debian.org>
Bug-Debian: http://bugs.debian.org/651863
Signed-off-by: Jim Warner <james.warner@comcast.net>
When sort column header emphasis was extended to a
monochrome screen, the ability to emphasize selections
on the Fields Management screen was lost when colors
were not being displayed.
This patch corrects that bug by using the capclr_hdr
terminfo string instead of capclr_msg.
Reference:
commit 0c6aa6af41
Signed-off-by: Jim Warner <james.warner@comcast.net>
Until the 'locate/search' provisions were added,
top avoided the need for any function prototypes
through careful source file organization. But
the addition of the find_string function required
a prototpe for task_show, lest a massive file
reorganization be undertaken.
This commit moves the actual protype out of top.h
and places it adjacent to the caller in order to
avoid a warning when top_nls.c is compiled.
References:
commit 270e8e7eeb
commit d6e6a9aa38
Signed-off-by: Jim Warner <james.warner@comcast.net>
At one time the 'open_psdb_message' library call was
supported with the concept of a postponed message
which would display after top startup completed.
In turn, that required logic to strip the '\n' which
was embedded (inappropriately) in any such message.
Nowdays top treats such a returned error as fatal so
there is no need for the 'strim' function which is
being removed with this commit.
Signed-off-by: Jim Warner <james.warner@comcast.net>
We originally approached the potential problem of
% CPU distortions as unique to Nehalem type cpus.
The latest information suggests that it may have
been due to a kernel anomaly that has since been
corrected.
Yet even without such a cpu, wide disparities in
tics allocation among all available cpus have
sometimes been observed -- spikes as it were in
the normal pattern. This has happened under both
version 2.26.38-13 and 3.0.0-15 kernels.
The small amount of additional code addressing the
original problem carries very little overhead. It
is being retained to afford protection against any
future tic accounting aberrations.
In this commit, supporting programmer comments have
been divorced from any particular cpu type. Also,
another variable and manifest constant will now be
eliminated when CPU_ZEROTICS is defined.
References:
commit 02508b3d76http://www.freelists.org/post/procps/CStates-handling-new-switch,50
When the calibrate_fields function was broken up for
mainainability, an obscure regression was introduced.
For the resulting bug to affect the display, all of
the following conditions would have to be met:
. USE_X_COLHDR was not defined
. column highlighting had been turned on
. many, perhaps all, fields were displayable
. the user then typed the <End> key
. and the current sort column just happened to
be immediately to the left of the left-most
visible field
This patch corrects for that remote possibility.
Reference:
commit d0e16acf15
Signed-off-by: Jim Warner <james.warner@comcast.net>
This patch adds the -p option to the uptime(1) command, which changes
the uptime displayed from something like:
10:35:52 up 2:33, 1 user, load average: 1.69, 1.65, 1.63
to:
up 2 hours, 33 minutes
I originally implemented this as the up(1) program about 14 years ago.
In 2008 or 2009, I created a patch for procps to add this functionality
to uptime and submitted it to the project. Never heard from the
project and no new releases of procps had been made. Then I found out
about this project and decided to port my patch to it. So here it is.
This is really just for fun. There is no real technical reason to
have this functionality. But even now, 14 years later, I still get
emails asking where the source code for up is. So I thought it would
be nice for the uptime command on Linux to sport the up functionality
by default.
The calibrate_fields function had grown too large and
was adversly impacting maintainence. So half of the
logic was split out into a new function.
Now, maintainence of column headers and the required
library flags is organized as follows:
. adj_geometry (calibrate_fields helper)
provides low-level support for sigwinch, memory
. build_headers (calibrate_fields helper)
constructs the headers and library flags
. calibrate_fields
establishes which fields will be displayed
( note the alpha order mentioned in a prior commit )
Signed-off-by: Jim Warner <james.warner@comcast.net>
The top program is carefully organized into sections
and those sections are carefully placed so as to avoid
the need for prototypes. *
Additionally, names of functions are carefully chosen
to maintain alphabetical order within each section.
The names of most 'helper' functions, which are always
placed immediately above the calling functions, often
only met the spirit of the alphabetical law, not the
actual letter of that law.
This commit alters the names of such helper functions
so as to mainatin strict ascii alphabetical order
within each section.
* the single exception to prototypes is find_string,
which calls the task_show function, and would have
prompted a massive reorganization.
Signed-off-by: Jim Warner <james.warner@comcast.net>
The recently added logic dealing with "missing" tics
is mutually exclusive with logic associated with a
define called CPU_ZEROTICS.
This commit expands the use of that define to exclude
such Nehalem logic as appropriate.
It also extends programmer notes in top.h to include
an attribution for initiating the topic of potential
Nehalem type % CPU distortions, acknowledging:
Jaromir Capik, <jcapik@redhat.com>
References
commit ce1410a51a
commit 9e7dd43ab7
commit a9041a5526
The mem and swap lines have enough room to show eight significant
digits, so switch to showing MB when >=100MB, not >=10MB.
The extra detail is valuable; it should not be elided.
Signed-off-by: James Cloos <cloos@jhcloos.com>
Signed-off-by: Jim Warner <james.warner@comcast.net>
Due to a poorly constructed temporary fprintf
used during development, an earlier commit went
a little too far in its computations. The net
result was the code looked nice but actually
accomplished nothing.
It is the /proc/stat line 1 (summary line)
whose tics must be used in establishing the
threshold boundary. And that calculation
need be performed just once per frame.
This commit ensures one threshold calculation
per delay interval no matter how many cpus
are ultimately displayed.
It also corrects scalability by factoring in
the total number of online processors.
Reference:
commit 9e7dd43ab7
Along the way to width override support (-w switch),
this top began clearing the screen far more often
than his predecessor. In fact, it happend with each
user keystroke.
This commit dramatically reduces those occurances.
The screen will now be cleared only when an actual
SIGWINCH is received.
Thanks for identifying this flaw belongs to:
James Cloos, cloos@jhcloos.com
References:
http://www.freelists.org/post/procps/Merge-request
Blame: c2dcbef482
Author: Jim Warner <james.warner@comcast.net>
Date: Thu May 26 11:33:32 2011 +0200
subject: added output width/height override support to top, + misc
The original approach to potential % CPU distortion due
to Nehalem type cores being turned off completely when
idle worked ok until the user typed something.
At that point, elapsed tics would no longer equal the
calculated value producing an undesirable 100% idle
condition until the next update or <Enter/Space> key.
This commit employs actual elapsed tics in determining
whether a cpu should be considered idle and thus makes
top's individual cpu display immune to user keystrokes.
This patch provides for cpu cores which can be turned
off completely when idle (Nehalem, etc.) thus registering
very few or no tics since the last update cycle.
When CPU_ZEROTICS is not defined (the default), any
displayed cpu with less than a certain amount of total
tics will show as 100% idle. That amount is tempered
by the delay interval and total number of cpus.
This commit also satisfies the Debian 'top_nohz' patch
(11/24/09) in a slightly more efficient manner. That
patch concerned kernels built with CONFIG_NO_HZ.
Reference:
http://www.freelists.org/post/procps/CStates-handling-new-switch,4
Prior to this patch, top was able to handle any hotplugged
cpus *added* to the system in two distinct ways.
1) Newly added cpus would be detected by sysinfo_refresh
calling the library's cpuinfo function, which occurs
at most every 5 minutes.
2) The user could force a refresh using either the
<Enter> or <Space> keys.
Unfortunately, the *loss* of a cpu would produce an early
exit due to a /proc/stat read failure. Such a failure
can be produced in the following way:
sudo echo 0 > /sys/devices/system/cpu/cpu??/online
This commit allows top to tolerate the loss of cpus.
It also provides for more efficient CPU_t management,
especially for massively parallel cpu environments.
Note: Changes to the cpu compliment can produce a single
cycle distortion of cpu percentages. Such distortion is
most visible when each cpu is being displayed. It can
be eliminated with a forced refresh via <Enter>/<Space>.
With the introduction of the 'locate string' provisions,
the precedent for calling tertiary helper functions from
secondary do_key helper functions was established.
This commit simply migrates some additional keys out of
the do_key function itself and into the more generalized
key table.
Normally, when the chosen sort column is displayed via the
'x' command toggle the entire column is highlighted. And
while this version of top substantially reduced the cost
of such highlighting, a small pathlength increase remained.
The USE_X_COLHDR define was an experimental alternative which
eliminated all recurring runtime costs for such emphasis by
highlighting the column header, not the entire column.
The previous implementation required colors to be turned on
(the 'z' toggle) for such highlighting to be visible. This
commit extends column header emphasis to include monochrome
displays as well.
Reference:
http://www.freelists.org/post/procps/post-nls-merge,6
Since its inception, this top has improperly handled an
empty HOME environment variable. Under those conditions
a path to the root directory would have been constructed.
That caused no real harm upon startup since the display
defaults would have been employed. However, except for
root, it would have been impossible to save the rc file.
This commit keeps the promise made in the documentation.
This commit addresses a long standing buglet (debian #441166) which
surfaces when the display mode is switched between task and threads.
An extra procps refresh is now forced upon such a transition which
parallels the approach used at startup for the exact same reason.
Reference: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=441166
This commit corrects some outdated programmer comments.
Additionally, certain nls justifications might become
increasingly obscure with the passage of time so some
previous nls commit text has been added as comments.
This patch represents the final resting place for miscellaneous
changes not otherwise encountered or for which the resolution
was incomplete or incorrect.
Until this patch, top had used some strings with
special escape sequences to produce colors, normal
text, bold text, etc. They took the following form,
explained by an excerpt from program comments:
...
Our special formatting consists of:
"some text <_delimiter_> some more text <_delimiter_>...\n"
Where <_delimiter_> is a single byte in the range of:
\001 through \010 (in decimalizee, 1 - 8)
and is used to select an 'attribute' from a capabilities table
which is then applied to the *preceding* substring.
...
Unfortunately, these nonprinting values revealed
insurmountable inconsistencies in both the front-end
and back-end translation tools.
The xgettext (extraction) program would take those
special escapes, convert them and then output raw
binary values. Thus the .pot file would contain
lots of unprintable stuff making it unreadable.
If the following was added to po/Makevars, most of
those special escapes would be preserved in their
escape notation:
XGETTEXT_OPTIONS = ... --escape
But two escapes were converted from octal notation
and there was no way to prevent it:
\007 --> \a
\010 --> \b
After a pass through the msginit program, most of
the escapes were reconverted to raw binary values
making translation impossible. There was no
"--escape" option for the back-end programs like
there was for xgettext.
But the real killer was the escape \004, also used
in some of top's special strings. This value would
be silently accepted by xgettext, only to produce
the following fatal error in back-end programs like
msginit, msgfmt and msgen:
.pot:2647: context separator <EOT> within string
To quote from one of the references below:
"Would you create a suite of tools that silently
allow what is destined to become a fatal error
to pass unnoticed?"
So the bottom line was: top's special strings, in
use for the past nine years, had to be redesigned.
References:
http://www.freelists.org/post/procps/procpsng-nls-support,11http://www.freelists.org/post/procps/procpsng-nls-support,14
summary of changes:
. adopted relative paths to 'include' and 'proc'
dirs so that stand alone compiles are made
easier and no one need guess their locations
. corrected several names for enums and macro
usage reflecting fmt vs. txt
. expanded all octal escape sequences to a full
3 digits since one already required 3 digits
. finalized translator hints (for now)
programming note:
as an aside, by not including an argument for
the gettext --add-comments, any preceeding c
style comment will be propagated to the .pot
file, if the gettext macro isn't empty.
/* Need Not Say 'TRANSLATORS' ...
snprintf(buf, sizeof(buf), "%s", _( // unseen
/* Translator Hint: ...
snprintf(buf, sizeof(buf), "%s", _("" // seen
