A recent buglet in the <meminfo> interface, where many
delta values could legitimately be negative, suggested
a review of this module where a minus was forced to 0.
As it turns out, there are two delta items that indeed
could be negative. They involve the current processes.
So henceforth, DELTA_PROC_BLOCKED & DELTA_PROC_RUNNING
will now be allowed to go negative. I believe that all
other items can only grow. But, if we find more later,
at least the adaptation approach has been established.
[ this whole business of checking for less than zero ]
[ harks back to an old kernel anomaly where negative ]
[ tics were sometimes experienced. top was affected. ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
The 'new' function requires a NULL context pointer, so
when existing code worked, it was just a case of luck.
Signed-off-by: Jim Warner <james.warner@comcast.net>
When the code for DELTA values (among other stuff) was
stolen from the recently revised <stat> interface, the
concept of ever growing values was propagated too. But
here we must manage both growing and shrinking values.
Thus former protections against a negative delta don't
have any place in this module and are hereby banished.
Signed-off-by: Jim Warner <james.warner@comcast.net>
For some time with enough compilier flags I have watched the
following warning drift by:
ps/output.c: In function ‘pr_nwchan’:
ps/output.c:658:41: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
return snprintf(outbuf, COLWID, "%x", (unsigned)rSv(WCHAN_NAME, str, pp));
nwchan is supposed to be the address of where the process is sleeping,
not the name. Besides %x is a hex number not a string hence the warning.
nwchan now prints the address, in hex and GCC is happy.
Thus function returns a pointer, not an int, so if there is
an error return NULL and not -errno.
proc/meminfo.c: In function ‘procps_meminfo_select’:
proc/meminfo.c:994:20: warning: return makes pointer from integer
without a cast [-Wint-conversion]
return -ENOMEM;
References:
commit 407f1b71de
In view of Craig's work with the vmstat <STAT> change,
adaptation to <MEMINFO> changes is offered separately.
Signed-off-by: Jim Warner <james.warner@comcast.net>
This patch just brings *most* other programs into line
with those changes recently made in the <meminfo> API.
Signed-off-by: Jim Warner <james.warner@comcast.net>
This represents the refinement of this interface after
the <stat> API was redesigned. We now follow a pattern
of 'get' for single item retrieval & 'select' for when
multiple items are desired, with just 1 function call.
And again following the <stat> lead this interface now
provides for delta values encompassing most items. The
reason I went cuckoo nuts with those deltas is because
they are essentially free. At the cost of a little RAM
and just one memcpy there's no other price to be paid.
Signed-off-by: Jim Warner <james.warner@comcast.net>
In the commit referenced below it was acknowledged the
procps_stat_get() function will intentionally restrict
returned values by excluding DELTA items among others.
Upon reflection that decision seemed rather arbitrary,
and so has now been lifted. And, while the initial use
of a DELTA will return 0, subsequent calls to that get
function will now return the difference (providing one
second, at least, has elapsed between any such calls).
Reference(s):
. reference to design decisions
commit abc71a46ad
Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit is just my usual tweaking after an initial
submission, once the dust has settled & some more desk
checking was performed. Here are the changes included:
. get function need not check the 'stat_was_read' flag
( first time in save_sec == 0 so branch always taken )
. some table logic appeared outside the proper section
. cleanup_stack's loop made to work like assign_result
. eliminated an include of procps.h from stat.h header
. removed 'ext_numitems' from the stacks_extent struct
. changed the alignment of three prototypes for stat.h
. reorganized the pointers for 'stacks_extents' struct
. improved types indentation in header for readability
. lastly, some really gratuitous changes made to align
- comments within that private 'stacks_alloc' function
Signed-off-by: Jim Warner <james.warner@comcast.net
This patch brings the ps program (very small impact) &
that vmstat program (major impact) into agreement with
the new <stat> API. In the case of the latter guy, the
many separate calls to 'get' should be replaced by one
single 'select' call obtaining all data in one stroke.
[ but, i was too tired to undertake that enhancement ]
Signed-off-by: Jim Warner <james.warner@comcast.net>
This guy is the real beneficiary of the new <stat> API
especially when it comes to the DELTA items which were
really the only values of interest (beyond some id's).
Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit represents a complete redesign of the stat
interface. Gone are the confusing 8 separate accessors
along with their 2 additional read functions. In their
place we have just 3 accessors, with no read required.
That old interface also suffered an inflexibility with
respect to structures. Now we deal with an unchanging
standard 'result' struct enabling future changes where
the binary interface will no longer need to be broken.
And gone is that former unnecessary typedef, used when
dealing with jiffies. Now the standard C type is used.
Our new API also adds some brand new functionality. If
a caller plans to employ successive 'select' or 'reap'
invocations, then delta values are available (which is
actually only what that top program is interested in).
At some future point a 'sort' function could be easily
introduced to complement the 'reap' function. However,
I saw no need for it at present and so it was omitted.
There were several design decisions which everyone may
not agree with. In support I'll offer these rationals:
. The 'get' function returns a signed long long result
which means a potential loss of some significance. But
I felt the ability to distinguish actual errors (minus
values) from true zero results were worth such a risk.
. The DELTA item enumerators were also made signed and
smaller than their parents. And they are intentionally
grouped as last so as to emphasize those distinctions.
. The SYS type items were excluded from the new 'reap'
function. It would not make sense to duplicate them in
each results stack. They're limited to 'get'/'select'.
. By the same token, some items (DELTA, etc.) will not
be allowed under that 'get' routine. That function was
already open to significant internal overhead (through
subsequent calls like in vmstat.c). That is why it has
been limited via 1 second between reads of /proc/stat.
Lastly, when we finally get around to documenting this
interface there's a real potential toe stubber when it
comes to the numa node portion. The libnuma.so doesn't
really provide any means to retrieve the active nodes.
Thus, any total reported by <stat> is just the highest
node number plus one, as reported by the numa library.
Any unused/inactive nodes are identified through these
. PROCPS_STAT_TIC_ID shows as PROCPS_STAT_NODE_INVALID
By the same token after the STAT_REAP_CPUS_ONLY 'reap'
. PROCPS_STAT_TIC_NUMA_NODE = PROCPS_STAT_NODE_INVALID
Reference(s):
http://www.freelists.org/post/procps/newlib-stat-interface
Signed-off-by: Jim Warner <james.warner@comcast.net>
During work on the new <stat> interface the typedef of
jiffs was eliminated along with the clang warning. The
exact same warning in sysinfo.h now goes bye-bye also.
Reference(s):
./proc/sysinfo.h:16:28: warning: redefinition of typedef 'jiff' is a C11 feature [-Wtypedef-redefinition]
typedef unsigned long long jiff;
Signed-off-by: Jim Warner <james.warner@comcast.net>
This commit contains the following changes, which were
prompted by a coverity analysis which Craig initiated:
. comment typo predicting 'String not null terminated'
. eliminate 'Logically dead code' from insp_make_row()
And this tweak unrelated to coverity is also included:
. use more modern (recommended) approach for time call
Signed-off-by: Jim Warner <james.warner@comcast.net>
The previous commit did not take into account operator evaluation
order so always gave 0. Fixed the macro and added some checks for
the macro.
References:
commit 9abf7d879d
Linux release numbers are x.y.z we assumed but never protected
against x> 0x7fff and y,z > 0xff before.
Linux release in 1991, 1 major release per 6 years so we're fine
until 7452, unless they do way too many minor rels (max being 39)
procps_uptime, previously just plain uptime() used to put the
uptime (as a double) in the first argument and return uptime
(as an int).
It meant if you ran
myuptime2 = procps_uptime(&myuptime1, NULL);
You might get different results for myuptime1 and myuptime2 because
they are different types.
Most library calls use the return value to return the status,
procps_uptime was in the middle.
Until now.
This function will return 0 on success. If you want (for whatever
reason) uptime as an int then cast it.
All of the procps binaries didn't use the return value for uptime
except ps which set a variable to it but never used it anywhere.
While procps_diskstat_ref and procps_diskstat_unref were declared
they actually weren't implemented in the library. Linking some
binary that used these functions gave the following errors:
CCLD vmstat
vmstat.o: In function `disksum_format':
vmstat.c:719: undefined reference to `procps_diskstat_unref'
vmstat.o: In function `diskformat':
vmstat.c:591: undefined reference to `procps_diskstat_unref'
The segment may have been destroyed by the kernel automagically
after shmdt(addr)
How to reproduce:
sysctl -w kernel.shm_rmid_forced=1
./pmap 1
shared memory remove: Invalid argument
[..]
All other programs were able to accommodate the change
in name from readstat.h to stat.h without modification
because they were all using that procps.h header file.
Well now top can too (providing you ignore a comment).
Signed-off-by: Jim Warner <james.warner@comcast.net>
In an attempt to normalize the 'stat' interface, we'll
first shed any reminders of the old readproc interface
by changing file names to be more descriptive & brief.
Signed-off-by: Jim Warner <james.warner@comcast.net>
After the commit referenced below the potential exists
for a SEGV (resulting from an out-of-bounds Item_table
reference if PROCPS_PIDS_physical_end is encountered).
So this patch eliminates that PROCPS_PIDS_physical_end
as no longer necessary and completes the task of using
PROCPS_PIDS_logical_end as a sole necessary fencepost.
Reference(s):
commit e7585992d9
Without breaking either ABI or API just rearrange some
stuff to provide a little more consistent source file.
[ these were prompted by some work on the <stat> API ]
[ in preparation for him borrowing some of our code. ]
Reference(s):
Signed-off-by: Jim Warner <james.warner@comcast.net>
With the configure option --enable-harden-flags the CFLAGS and
LDFLAGS are manipulated to provide some hardening protection
to the binaries.
psmisc uses these flags on by default with no troubles, however
it doesn't have a library in it either.
References:
https://wiki.debian.org/Hardening
Generalised the library API tests and created a common
test-runner. Instead of copy and pasting the same code in
each time.
First cut of pids API test, for _new so far.
Remove a remnant of this new API's evolution. Here we
no longer fill stacks, rather we reap and select them.
Signed-off-by: Jim Warner <james.warner@comcast.net>
By co-mingling both external/internal identifiers with
actual implementation code, potential future additions
to our API would have been considerably more difficult.
So, this patch will now rely solely on internal/hidden
identifiers serving as fenceposts in validation logic.
And if the following convention is used for new fields
we will maintain that enumerator alphabetic ordering a
a little longer (even though 2 user fields now don't):
. PROCPS_PIDS_XTRA_FOO_A, PROCPS_PIDS_XTRA_FOO_B, etc.
Reference(s):
http://www.freelists.org/post/procps/me-too-newlib,7
Signed-off-by: Jim Warner <james.warner@comcast.net>
Unfortunately, reading that '/proc/sys/kernel/pid_max'
file returns a newline, which we will now account for.
[ also, we should use the existing dedicated buffer ]
Reference(s):
. original 'procps_pid_length' introduction
commit ccb6ae8de1
Signed-off-by: Jim Warner <james.warner@comcast.net>
A difference in behaviour between the sysvinit and procps pidof
was that the procps one would sometimes not find process that
the sysvinit one did.
The difference is that if a space is found in argv[0] then sysvinit
would look at cmd for a match. This isn't perfect and more of a
best guess but does often work.
procps pidof now follows the same "standard". The most obvious
difference is with kde based processes and incoming ssh connections
with sshd.
References:
Commit 3f5b75035e
GitLab issue #4https://gitlab.com/procps-ng/procps/issues/4https://github.com/limingth/sysvinit/blob/master/sysvinit-2.88dsf/src/killall5.c#L800
escaped_copy(): only appears in ps, moved to ps/output.c
escape_strlist() only used in escape.c made static
escape_command() used in library, made internal
procps.h no longer includes escape.h
escape_str() used by library and ps so needs to be exported
definition put into procps.h including the odd define required.
Far from ideal to have it this way, will look at it another time
to have it all in, all out or split nicer so its not in the API;
perhaps a lib/ file?
readproc still had some of the old API hanging around that
was good while we were trying it out, but its time to say
goodbye:
readproc.h removed from public procps.h header file
enum ns_type - not used - removed
get_ns_name() - not defined - removed
get_ns_id() - not defined - removed
PROCTAB proc_t only used internal to library
readproctab() and 2,3 friends not used - removed
proc_data_t was used by readproctab23() - removed
readtask() - not used - removed
read_cmdline() - copy,renamed and made generic - remove original
freeproc() - not used - removed
get_proc_status - not used - removed, however there should be
a new function created that does this. Given a PID return data
about it instead of scanning the entire procfs. Maybe it already does.
Left as internal-to-library only functions:
readproc(), readeither(), look_up_our_self(), openproc(), closeproc()
Updated libprocps.sym to export only what we use.
Rather than importing NORETURN & MALLOC, it feels more
natural to use the native gcc attribute for NORETURN &
eliminate the use of a questionable MALLOC altogether.
Reference(s):
commit ccb6ae8de1
Signed-off-by: Jim Warner <james.warner@comcast.net>
Now that the conditional OOMEM_ENABLE has been removed
and more attention recently paid to the 2 oomem fields
it was revealed that Rc.zero_suppress didn't extend to
them. So this commit will just correct that oversight.
And while we're at it, we'll also extend zero suppress
to that NI (nice value) field, which already should've
had it. Plus we trade those namespaces custom suppress
logic for our now slightly enhanced make_num function.
Reference(s):
. removal of misguided OOMEM_ENABLE
commit 64238730fa
. zero suppression only recently added to namespaces
commit b2853ed117
Signed-off-by: Jim Warner <james.warner@comcast.net>
Now that the conditional OOMEM_ENABLE has been removed
and all users exposed to those 'out of memory' fields,
it's about time we added them to the top man document.
But before doing so, it's long past time that they are
normalized to at last remedy this kind of foolishness:
. excessive width on that oomem score itself (8 vs. 4)
. some potentially confusing names inherited from suse
Reference(s):
. removal of misguided OOMEM_ENABLE
commit 64238730fa
Signed-off-by: Jim Warner <james.warner@comcast.net>
Now that the conditional OOMEM_ENABLE has been removed
and, after reviewing current library support, it turns
out we've been using a deprecated /proc/<pid>/oom_adj.
What we should use instead is that more recent tunable
/proc/<pid>/oom_score_adj. This new field will provide
a range of -1000 thru +1000 (former was -17 thru +15).
Reference(s):
. removal of misguided OOMEM_ENABLE
commit 64238730fa
. linux, partial oom_adj revert (Nov, 2012)
commit fa0cbbf145aabbf29c6f28f8a11935c0b0fd86fc
. linux, removal oom_adj (Oct, 2012)
commit 01dc52ebdf472f77cca623ca693ca24cfc0f1bbe
Signed-off-by: Jim Warner <james.warner@comcast.net>
