lttng-tools.git
16 months agoTests: add a recording rule listing test
Jérémie Galarneau [Thu, 15 Jun 2023 20:38:08 +0000 (16:38 -0400)] 
Tests: add a recording rule listing test

Add a test that validates that recording rules can be added to a channel
and listed back. Most of the changes are to the lttngtest package in
order to provide the requisite capabilities to the test itself.

This test is also intended as a reproducer for #1373.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I1c6b5e072934ba9760cb1f838395e18a4c6bb211

16 months agoFix: sessiond: crash enabling event rules that differ only by loglevel type
Jérémie Galarneau [Wed, 14 Jun 2023 23:03:12 +0000 (19:03 -0400)] 
Fix: sessiond: crash enabling event rules that differ only by loglevel type

Issue observed
--------------

Summarizing bug #1373, an assertion fails when enabling two event-rules
that only differ by their log level selection type (all, range, or
single).

This issue can be reproduced by launching an instrumented
application (which remains active over the duration of this test) and
running:
  $ lttng create test_session
  $ lttng enable-channel --userspace test_channel
  $ lttng start test_session
  $ lttng enable-event --userspace --session test_session --channel test_channel 'l*' --loglevel-only=TRACE_DEBUG_LINE
  $ lttng enable-event --userspace --session test_session --channel test_channel 'l*' --loglevel=TRACE_DEBUG_LINE

Cause
-----

A number of sites conflate log level values and type. A clean-up had
been performed previously as of 2106efa08 and through follow-up commits.
However, some instances were apparently missed at the time.

As such, add_unique_ust_app_event mixed loglevel values and types when
initializing the key used for the unique insertion. The log level type,
for its part, is completely ignored.

Going back to the reproducer above, the first insertion succeeds as
expected. The second insertion fails since there is already an app event
rule with the `TRACE_DEBUG_LINE` log level type.

Moreover, the matching function only matches on the log level
type (which is really the value), which is also a bug.

The "matching" function is invoked on the key of the second event rule
and the first event rule since the hashing is only performed on the
event-rule's name pattern, resulting in a collision.

Solution
--------

Both the log level value and log level types are used to perform the
matching within the ust-app module. This implies extending the
ust_app_ht_key to store the log level value.

To simplify the matching logic (which attempted to handle 0 and -1
having the same meaning when the "ALL" log level type was used), the log
level value is normalized to '-1' throughout.

Fixes #1373
Reported-by: Bogdan Codres <bogdan.codres@windriver.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I869a0fb7a6554da7d84bc71df6ee91a7e46937cc

16 months agoTests fix: lttngtest: quote session output path
Jérémie Galarneau [Fri, 16 Jun 2023 21:01:13 +0000 (17:01 -0400)] 
Tests fix: lttngtest: quote session output path

The output path used with the `--output` option must be quoted since it
can contain spaces.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I7bf557f64d3fb72a10230ad9da9d59872672e11c

16 months agoTests: remove accidental import of cgi.test
Jérémie Galarneau [Thu, 15 Jun 2023 20:37:33 +0000 (16:37 -0400)] 
Tests: remove accidental import of cgi.test

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I17c1776e8981e212636b65244a58389f194b5d4c

16 months agoTests: lttngtest: raise NotImplementedError in abstract class methods
Jérémie Galarneau [Thu, 15 Jun 2023 16:16:59 +0000 (12:16 -0400)] 
Tests: lttngtest: raise NotImplementedError in abstract class methods

It is preferable to error-out when a Controller doesn't support a method
rather than silently failing.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I3751bf4cff97f400ae53e07efb2740e8426992e9

16 months agoTests: lttngtest: add methods to control session rotations
Jérémie Galarneau [Thu, 15 Jun 2023 16:14:01 +0000 (12:14 -0400)] 
Tests: lttngtest: add methods to control session rotations

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I8b8513fa37e6a51e034e5832499085c501e34ac4

16 months agoTests: lttngctl.py: allow the creation of per-pid buffers
Jérémie Galarneau [Thu, 15 Jun 2023 16:09:05 +0000 (12:09 -0400)] 
Tests: lttngctl.py: allow the creation of per-pid buffers

Add BufferSharingPolicy which can be used with the add_channel method of
a Session to create per-pid channels.

This is done to allow tests for the per-pid buffer sharing mode to be
written using the python utils.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ice3b5d3a8db69c95aaa632c45f42069ab2be590c

16 months agoTests: introduce WaitTraceTestApplicationGroup
Jérémie Galarneau [Thu, 15 Jun 2023 16:00:40 +0000 (12:00 -0400)] 
Tests: introduce WaitTraceTestApplicationGroup

A new test helper, WaitTraceTestApplicationGroup, is added to make it
easier to write test that require a group of applications.

A WaitTraceTestApplicationGroup can be used to:
  - launch a given number of applications,
  - make them trace (almost) all at once,
  - wait for the group of applications to complete

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I18023f1c507993a3e5647f87cd74ead3be392163

16 months agoClean-up: sessiond: ust-app: ua_sess is never populated on failure
Jérémie Galarneau [Mon, 15 May 2023 19:49:04 +0000 (15:49 -0400)] 
Clean-up: sessiond: ust-app: ua_sess is never populated on failure

When find_or_create_ust_app_session() fails, it doesn't populate its
return parameter. Therefore, it is unnecessary to destroy the app
session when it returns < 0.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I8f5cc75f718d96d32fb67fc67135034eb95365d7

16 months agoTests: user space context: remove unneeded test import
Jérémie Galarneau [Wed, 3 May 2023 19:24:51 +0000 (15:24 -0400)] 
Tests: user space context: remove unneeded test import

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I2c109562022fdb4934fdd950ce106cfd66509cd3

16 months agoTests: environment: base WaitTraceTestApplication on gen-ust-events
Jérémie Galarneau [Wed, 3 May 2023 18:55:09 +0000 (14:55 -0400)] 
Tests: environment: base WaitTraceTestApplication on gen-ust-events

WaitTraceTestApplication wraps gen-ust-nevents, but that test app offers
few synchronization points compared to gen-ust-events.

The synchronization points to determine that the application has reached
its `main()` and just before emiting its first event are added to
gen-ust-events. WaitTraceTestApplication is adapted to use those new
options.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Idf717fbaa9108d48a3f7d2b26946a4e5c5dfffd5

16 months agoTests: environment: use a context manager to restore original signal handler
Jérémie Galarneau [Wed, 3 May 2023 18:14:51 +0000 (14:14 -0400)] 
Tests: environment: use a context manager to restore original signal handler

The original signal handler for SIGUSR1 was not restored when launching
the session daemon. This didn't cause any issue, but is unexpected and
would have been a real head scratcher if we wanted to use it later.

To prevent us from forgetting to restore signals when using a
_SignalWaitQueue, a context manager is provided to handle that
automatically.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I86599846ad2000af5d1e3c5cb2a0a73fb1c91455

16 months agocommon: Add a default nullptr argument to make_unique_wrapper
Jérémie Galarneau [Sat, 4 Feb 2023 00:24:54 +0000 (19:24 -0500)] 
common: Add a default nullptr argument to make_unique_wrapper

When wrapping C libraries that return unmanaged pointers,
lttng::make_unique_wrapper makes it easier to locally "wrap" returned
pointers.

  auto val = lttng::make_unique_ptr<struct foo *,
                                    lttng::free>(some_func());

However, in its current form, a nullptr must be passed to define an
alias:

  using my_type_uptr =
    decltype(lttng::make_unique_wrapper<lttng_session,
                                        lttng::free>(nullptr));

Adding a default nullptr argument cuts down a bit of boiler plate.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I9d05d8162d28cc156b1e9ec6fe623f1cc02e9c8e

16 months agoTests: Reduce runtime for high_throughput_limits test
Kienan Stewart [Fri, 9 Jun 2023 20:30:10 +0000 (16:30 -0400)] 
Tests: Reduce runtime for high_throughput_limits test

The test currently takes about 2 hours to run. The iteration count and
range of bandwidth limits have been adjusted to reduce the runtime,
while hopefully covering the same goal: attempting to catch rare race
conditions in low-bandwidth scenarios.

The iteration count has been set so there should be some dropped
events, and a diagnostic message emitted if ever there are no dropped
events.

Change-Id: I670414b60c6881c3a6f7aafd2c1b0c4540e6707f
Signed-off-by: Kienan Stewart <kstewart@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
16 months agofix: tests: grep for '$key =' in metadata
Michael Jeanson [Tue, 23 May 2023 19:22:04 +0000 (15:22 -0400)] 
fix: tests: grep for '$key =' in metadata

Always grep for '$key =' to avoid a collision with a value, for example
if you are looking for the 'domain' key and your hostname contains
'domain'.

While we are here, add a bunch of logging to facilitate debugging in the
future.

Change-Id: I09197169ab7f842921c9139fdeb36007d7b20cfb
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
17 months agoBuild fix: workaround g++ 4.8 decltype handling bug
Jérémie Galarneau [Fri, 9 Jun 2023 20:28:09 +0000 (16:28 -0400)] 
Build fix: workaround g++ 4.8 decltype handling bug

g++ 4.8.5 fails to build with the following error:
  g++ -std=gnu++11 -DHAVE_CONFIG_H   -I../../../include -I../../../include -I../../../src -I../../../src -include config.h  -I/home/mjeanson/opt/include   -I/home/mjeanson/opt/include   -DINSTALL_BIN_PATH=\""/home/mjeanson/opt/bin"\"   -fvisibility=hidden -fvisibility-inlines-hidden -fno-strict-aliasing -Wall -Wextra -Wmissing-declarations -Wundef -Wredundant-decls -Wshadow -Wsuggest-attribute=format -Wwrite-strings -Wformat=2 -Wstrict-aliasing -Wmissing-noreturn -Wlogical-op -Winit-self -Wno-incomplete-setjmp-declaration -Wno-gnu-folding-constant -Wno-sign-compare -pthread  -Wno-shadow -Wno-missing-field-initializers -MT commands/lttng-list_triggers.o -MD -MP -MF commands/.deps/lttng-list_triggers.Tpo -c -o commands/lttng-list_triggers.o `test -f 'commands/list_triggers.cpp' || echo './'`commands/list_triggers.cpp
  In file included from commands/../utils.hpp:12:0,
                   from commands/../command.hpp:12,
                   from commands/list_triggers.cpp:8:
  ../../../src/common/container-wrapper.hpp: In instantiation of ‘typename std::conditional<std::is_pointer<_Dp>::value, ElementType, ElementType&>::type lttng::utils::random_access_container_wrapper<ContainerType, ElementType, ContainerOperations>::operator[](std::size_t) [with ContainerType = const lttng_action*; ElementType = const lttng_action*; ContainerOperations = lttng::ctl::details::const_action_list_operations; typename std::conditional<std::is_pointer<_Dp>::value, ElementType, ElementType&>::type = const lttng_action*; std::size_t = long unsigned int]’:
  ../../../src/common/container-wrapper.hpp:78:21:   required from ‘typename std::conditional<std::is_pointer<U>::value, IteratorElementType, IteratorElementType&>::type lttng::utils::random_access_container_wrapper<ContainerType, ElementType, ContainerOperations>::_iterator<IteratorContainerType, IteratorElementType>::operator*() const [with IteratorContainerType = lttng::utils::random_access_container_wrapper<const lttng_action*, const lttng_action*, lttng::ctl::details::const_action_list_operations>; IteratorElementType = const lttng_action*; ContainerType = const lttng_action*; ElementType = const lttng_action*; ContainerOperations = lttng::ctl::details::const_action_list_operations; typename std::conditional<std::is_pointer<U>::value, IteratorElementType, IteratorElementType&>::type = const lttng_action*]’
  commands/list_triggers.cpp:1030:66:   required from here
  ../../../src/common/container-wrapper.hpp:133:69: error: ‘const’ qualifiers cannot be applied to ‘lttng::utils::random_access_container_wrapper<const lttng_action*, const lttng_action*, lttng::ctl::details::const_action_list_operations>&’
   const auto& const_this = static_cast<const decltype(*this)&>(*this);
                                                                     ^

This bug was fixed in g++ 5.0, see:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60420

In this case, we can simply restate the class' type to work around the
issue since the problem is confined to the handling of decltype
declaration specifiers.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I3ba6b012af0f43f7cd06d780e6800c42e16cc66c

17 months agoWrap calls to fmt::format to catch formatting exceptions
Jérémie Galarneau [Thu, 8 Jun 2023 18:53:15 +0000 (14:53 -0400)] 
Wrap calls to fmt::format to catch formatting exceptions

fmt::format throws when a formatting error is encountered.
Unfortunately, we can't ensure complete coverage of all logging call
sites (e.g. error paths) and it is not desirable for such an exception
to be thrown in those cases.

The formatting error is returned as the formatted string so that it ends
up in the logs or exception messages more or less transparently.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I1cb33a5fe87221139eaf9de918b47e0397daa89c

17 months agoWrap main functions to handle uncaught exceptions
Jérémie Galarneau [Thu, 8 Jun 2023 18:20:09 +0000 (14:20 -0400)] 
Wrap main functions to handle uncaught exceptions

Coverity reports multiple instances where formatting facilities can
throw (e.g. invalid format string).

A wrapper to handle formatting exceptions is added in a follow-up
change, but it is a good practice to catch exceptions at the top level
nonetheless.

Reported-by: Coverity Scan
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ie55af338b9ef1f7d6e8825055cfc2e7037cdd80e

17 months agoFix: container-wrapper: size container operation can throw
Jérémie Galarneau [Thu, 8 Jun 2023 17:42:50 +0000 (13:42 -0400)] 
Fix: container-wrapper: size container operation can throw

  1512923 Uncaught exception
  If the exception is ever thrown, the program will crash.

  In lttng::​utils::​random_access_container_wrapper<lttng_action const *, lttng_action const *, lttng::​ctl::​details::​const_action_list_operations>::​size(): A C++ exception is thrown but never caught (CWE-248)

Reported-by: Coverity Scan
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I5f8bffc64fb239e59b272985f6b3c959d238da0a

17 months agocommon: silence bogus coverity warning
Jérémie Galarneau [Wed, 7 Jun 2023 20:57:37 +0000 (16:57 -0400)] 
common: silence bogus coverity warning

Coverity reports:
  1512891 Uninitialized scalar variable
  The variable will contain an arbitrary value left from earlier computations.

  In lttng_event_serialize(lttng_event const *, unsigned int, char
  const * const *,   char const *, unsigned long, lttng_bytecode *, lttng_payload *): Use of an uninitialized variable (CWE-457)

This warning is bogus since lttng_event_exclusion_comm contains a single
field which is already initialized and is packed (no padding possible).

Initialize the header explicitly to silence the warning.

Reported-by: Coverity Scan
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ia1eeee779168b3ac0eb9d0796d503b2d9ab225f2

17 months agoFix: coverity warns of uncaught exception
Jérémie Galarneau [Wed, 7 Jun 2023 20:28:27 +0000 (16:28 -0400)] 
Fix: coverity warns of uncaught exception

Coverity warns that some container operations used by
random_access_container_wrapper can throw even though methods are marked
as noexcept.

  CID 1512893 (#1-2 of 2): Uncaught exception (UNCAUGHT_EXCEPT)
  exn_spec_violation: An exception of type lttng::invalid_argument_error is thrown but the exception specification noexcept doesn't allow it to be thrown. This will result in a call to terminate().

The noexcept specifier is remvoved from operator* and end() of
random_access_container_wrapper's iterator implementation.

To make this a bit clearer, a bounds check is performed in operator[]
directly which will make errors easier to catch.

Reported-by: Coverity Scan
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I31d51e8709d33b3c80d64c8c05a23e519e3a93e7

17 months agoBuild fix: brace-enclosed initlializer lists error with g++ 4.8
Michael Jeanson [Wed, 7 Jun 2023 14:42:57 +0000 (10:42 -0400)] 
Build fix: brace-enclosed initlializer lists error with g++ 4.8

Looks like g++ 4.8 is confused by a single argument brace enclosed
initializer list:

utils.hpp: In constructor 'lttng::cli::session_list::session_list(lttng::cli::session_list&&)':
utils.hpp:112:38: error: call of overloaded 'random_access_container_wrapper(<brace-enclosed initializer list>)' is ambiguous
    { std::move(original._container) })
                                      ^

Change-Id: I19da292ed9a49bada7dbda5753bf1bd1442e612f
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
17 months agoclang-tidy: ignore generated filter-parser.hpp
Jérémie Galarneau [Tue, 6 Jun 2023 18:09:44 +0000 (14:09 -0400)] 
clang-tidy: ignore generated filter-parser.hpp

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I92adc9c9fca588aad2dece474e89e2daa88f36d0

17 months agoFix clang-tidy cppcoreguidelines-pro-type-const-cast warning
Jérémie Galarneau [Tue, 6 Jun 2023 17:43:28 +0000 (13:43 -0400)] 
Fix clang-tidy cppcoreguidelines-pro-type-const-cast warning

clang-tidy reports:
cppcoreguidelines-pro-type-const-cast; do not use const_cast

The const_cast adds a const qualifier so this warning seems a bit
strict. Regardless, we can dodge the whole question by passing the
exclusion_list as `const char * const *`, which is closer to the
original intention of the API anyhow.

For more information on the safety of these types of casts, see:
https://isocpp.org/wiki/faq/const-correctness#constptrptr-conversion

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ia3129b7d1ed4e450f3f2d63920d2fd67c66a6d73

17 months agofmtlib: backport upstream fixes to suppress bogus gcc 13.1 warnings
Jérémie Galarneau [Tue, 6 Jun 2023 15:20:06 +0000 (11:20 -0400)] 
fmtlib: backport upstream fixes to suppress bogus gcc 13.1 warnings

gcc 13.1 erroneously warns of dangling references when using our custom
formatters. This was reported to both fmtlib and gcc and fixes have been
provided, but are not released yet.

This change backports two fixes from the master branch to our vendored
version:
https://github.com/fmtlib/fmt/commit/f61f15cc5b11582d50d02ba0514c5344f7b2600e
https://github.com/fmtlib/fmt/commit/ef55d4f52ec527668a8e910a56ea79d9b939dbc2

For more information on the issue, see:
https://github.com/fmtlib/fmt/issues/3415
https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=6b927b1297e66e26e62e722bf15c921dcbbd25b9

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I30bbbbe5e0aa2729e50228acdb528ee060d9df23

17 months agoFix: sessiond: incorrect use of exclusions array leads to crash
Jérémie Galarneau [Tue, 23 May 2023 23:35:10 +0000 (19:35 -0400)] 
Fix: sessiond: incorrect use of exclusions array leads to crash

Issue observed
--------------

When using the CLI to list the configuration of a session that has an
event rule which makes use of multiple exclusions, the session daemon
crashes with the following stack trace:

  (gdb) bt
  #0  0x00007fa9ed401445 in ?? () from /usr/lib/libc.so.6
  #1  0x0000560cd5fc5199 in lttng_strnlen (str=0x615f6f6c6c6568 <error: Cannot access memory at address 0x615f6f6c6c6568>, max=256) at ../../src/common/compat/string.h:19
  #2  0x0000560cd5fc6b39 in lttng_event_serialize (event=0x7fa9cc01d8b0, exclusion_count=2, exclusion_list=0x7fa9cc011794, filter_expression=0x0, bytecode_len=0, bytecode=0x0, payload=0x7fa9d3ffda88) at event.c:767
  #3  0x0000560cd5f380b5 in list_lttng_ust_global_events (nb_events=<synthetic pointer>, reply_payload=0x7fa9d3ffda88, ust_global=<optimized out>, channel_name=<optimized out>) at cmd.c:472
  #4  cmd_list_events (domain=<optimized out>, session=<optimized out>, channel_name=<optimized out>, reply_payload=0x7fa9d3ffda88) at cmd.c:3860
  #5  0x0000560cd5f6d76a in process_client_msg (cmd_ctx=0x7fa9d3ffa710, sock=0x7fa9d3ffa5b0, sock_error=0x7fa9d3ffa5b4) at client.c:1890
  #6  0x0000560cd5f6f876 in thread_manage_clients (data=0x560cd7879490) at client.c:2629
  #7  0x0000560cd5f65a54 in launch_thread (data=0x560cd7879500) at thread.c:66
  #8  0x00007fa9ed32d44b in ?? () from /usr/lib/libc.so.6
  #9  0x00007fa9ed3b0e40 in ?? () from /usr/lib/libc.so.6

Cause
-----

lttng_event_serialize expects a `char **` list of exclusion names, as
provided by the other callsite in liblttng-ctl. However, the callsite in
list_lttng_ust_global_events passes pointer to the exclusions as stored
in lttng_event_exclusion.

lttng_event_exclusion contains an array of fixed-length strings (with a
stride of 256 bytes) which isn't an expected layout for
lttng_event_serialize.

Solution
--------

A temporary array of pointers is constructed before invoking
lttng_event_serialize to construct a list of exclusions with the layout
that lttng_event_serialize expects.

The array itself is reused for all events, limiting the number of
allocations.

Note
----

None.

Change-Id: I266a1cc9e9f18e0476177a0047b1d8f468110575
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
17 months agolttng: reuse random_access_container_wrapper for session_list
Jérémie Galarneau [Tue, 6 Jun 2023 03:39:17 +0000 (23:39 -0400)] 
lttng: reuse random_access_container_wrapper for session_list

Reimplement lttng::cli::session_list in terms of the
random_access_container_wrapper utility since the code is essentially
duplicated.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I99160a54d5d2dfa7cf65a6287b271e9c2238c510

17 months agolttng: move session_list to the lttng::cli namespace
Jérémie Galarneau [Mon, 5 Jun 2023 21:39:39 +0000 (17:39 -0400)] 
lttng: move session_list to the lttng::cli namespace

This is a preliminary step to re-use the random_access_container util to
replace the implementation of session_list. No behaviour change is
intended by this change.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I32d0354a6985b8c6fb58813cf880ef04a10678dd

17 months agoProvide an idiomatic c++ interface for action lists
Jérémie Galarneau [Thu, 1 Jun 2023 20:19:31 +0000 (16:19 -0400)] 
Provide an idiomatic c++ interface for action lists

Replace for_each macros with the use of an iterator. It is done by using
a random_access_container_wrapper util which is intended to wrap
random_access containers implemented in C.

Change-Id: I1b22725b7335f267c9b2d02fc65f9375baf37426
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
17 months agoactions: list: Add `for_each_action_{const, mutable}()` macros
Francis Deslauriers [Wed, 23 Jun 2021 16:33:18 +0000 (12:33 -0400)] 
actions: list: Add `for_each_action_{const, mutable}()` macros

Accessing all the inner actions of a action list in a loop is a common
access pattern. This commit adds 2 `for_each` macros to iterate over all
elements either using a const or a mutable pointer.

Add a few unit tests for the list action to test these macros.

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I9aff0b81e1f782b5d20c3fcb82ee7028da8dd810

17 months agotrace-ust: Rename `{next, used}_channel_id` to `{next, used}_event_container_id`
Francis Deslauriers [Fri, 18 Jun 2021 16:23:35 +0000 (12:23 -0400)] 
trace-ust: Rename `{next, used}_channel_id` to `{next, used}_event_container_id`

Signed-off-by: Francis Deslauriers <francis.deslauriers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Idb07462c15cbebaf37a244ad76a32e893ecbab0c

17 months agoTests fix: test_callstack: output of addr2line incorrectly parsed
Jérémie Galarneau [Thu, 25 May 2023 23:15:20 +0000 (19:15 -0400)] 
Tests fix: test_callstack: output of addr2line incorrectly parsed

Issue observed
--------------

The test_callstack test fails with GCC 13.1 with the following output:

  Traceback (most recent call last):
  File "/usr/lib/lttng-tools/ptest/tests/regression/././kernel//../../utils/parse-callstack.py", line 160, in <module>
  main()
  File "/usr/lib/lttng-tools/ptest/tests/regression/././kernel//../../utils/parse-callstack.py", line 155, in main
  raise Exception('Expected function name not found in recorded callstack')
  Exception: Expected function name not found in recorded callstack
  ok 10 - Destroy session callstack
  PASS: kernel/test_callstack 10 - Destroy session callstack
  not ok 11 - Validate userspace callstack
  FAIL: kernel/test_callstack 11 - Validate userspace callstack

Cause
-----

parse-callstack.py uses 'split()' to split the lines of addr2line's
output. By default, 'split()' splits a string on any whitespace.
Typically this was fine as addr2line's output doesn't contain spaces and
the function then splits on new lines.

Typical output of addr2line:

  $ addr2line -e ./tests/regression/kernel//../../utils/testapp/gen-syscall-events-callstack/gen-syscall-events-callstack --functions --addresses 0x40124B
  0x000000000040124b
  my_gettid
  /tmp/test-callstack-master/src/lttng-tools/tests/utils/testapp/gen-syscall-events-callstack/gen-syscall-events-callstack.c:40

However, with the test app compiled using gcc 13.1, a "discriminator"
annotation is present:

  0x0000000000401279
  fct_b
  /tmp/test-callstack-master/src/lttng-tools/tests/utils/testapp/gen-syscall-events-callstack/gen-syscall-events-callstack.c:58 (discriminator 1)

Hence, by selecting the second to last element (-2, with negative
indexing), the addr2line function returns '(discriminator' as the
function name.

Solution
--------

The parsing code is changed to simply iterate on groups of 3 lines,
following addr2line's output format.

Fixes #1377

Change-Id: I8c1eab97e84ca7cad171904bed6660540061cf08
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoTests: add more output to test_ust_constructor
Michael Jeanson [Tue, 2 May 2023 21:06:29 +0000 (17:06 -0400)] 
Tests: add more output to test_ust_constructor

To make debugging test failures easier, add a tap result for each lttng
command and for each expected event.

Change-Id: I54872494c967f1e13bf6d5b05dc5c202abf5865e
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoTests: convert even more left-over type hint to type comment
Michael Jeanson [Tue, 2 May 2023 14:28:54 +0000 (10:28 -0400)] 
Tests: convert even more left-over type hint to type comment

Use type comments to support older python3 interpreters that can't
handle type hints (such as 3.4).

Change-Id: I4f97bc3f1e18b8701cb04175d97deb295178883b
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoDocs: test environment: clarify the behavior of a TraceTestApplication
Jérémie Galarneau [Mon, 1 May 2023 21:34:36 +0000 (17:34 -0400)] 
Docs: test environment: clarify the behavior of a TraceTestApplication

A TraceTestApplication, as opposed to a WaitTraceTestApplication, traces
immediately when it is launched. This is useful to test tracing from a
constructor, but should most likely not be used for other purposes.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I7c25a8a60008d584b9376fce74fb925fc02b846a

18 months agoTests: convert more left-over type hint to type comment
Michael Jeanson [Mon, 1 May 2023 20:50:57 +0000 (16:50 -0400)] 
Tests: convert more left-over type hint to type comment

Use type comments to support older python3 interpreters that can't
handle type hints (such as 3.4).

Change-Id: I3599311dfcc172344c759f8c0e22af640759f1f5
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoPort: fix -Wdeprecated-declarations warning about sprintf on macOS clang 14
Michael Jeanson [Tue, 18 Apr 2023 19:02:37 +0000 (15:02 -0400)] 
Port: fix -Wdeprecated-declarations warning about sprintf on macOS clang 14

Remove uses of sprintf to fix this warning:

    warning: 'sprintf' is deprecated: This function is provided for
    compatibility reasons only.  Due to security concerns inherent in the
    design of sprintf(3), it is highly recommended that you use snprintf(3)
    instead. [-Wdeprecated-declarations]

Change-Id: Idf3109f2eacafe0a7d18f4c132613f2f85afa09b
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoTests: ust_constructor: convert left-over type hint to type comment
Jérémie Galarneau [Mon, 1 May 2023 17:45:27 +0000 (13:45 -0400)] 
Tests: ust_constructor: convert left-over type hint to type comment

Use type comments to support older python3 interpreters that can't
handle type hints (such as 3.4).

Python 3.4 reports the following error:
  File "./ust/ust-constructor/test_ust_constructor.py", line 176
    client: lttngtest.Controller = lttngtest.LTTngClient(test_env, log=tap.diagnostic)
          ^
  SyntaxError: invalid syntax
  ERROR: ust/ust-constructor/test_ust_constructor.py - missing test plan
  ERROR: ust/ust-constructor/test_ust_constructor.py - exited with status 1

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ic0ead4b9bedfca56e8999bf4012e103801794655

18 months agoTests: ust_constructor: convert type hints to type comments
Jérémie Galarneau [Mon, 1 May 2023 15:57:48 +0000 (11:57 -0400)] 
Tests: ust_constructor: convert type hints to type comments

Use type comments to support older python3 interpreters that can't
handle type hints (such as 3.4).

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Id8b040fb36a4f243a3af0d731843028ad2f4388d

18 months agoClean-up: lttng: utils: coding style fix
Jérémie Galarneau [Fri, 28 Apr 2023 14:46:08 +0000 (10:46 -0400)] 
Clean-up: lttng: utils: coding style fix

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ia23ad0168729819bcb0735ff8e55ce02fc9bcd20

18 months agoTests: Introduce test_ust_constructor
Mathieu Desnoyers [Fri, 17 Feb 2023 20:32:25 +0000 (15:32 -0500)] 
Tests: Introduce test_ust_constructor

Test instrumentation coverage of C/C++ constructors and destructors by
LTTng-UST tracepoints.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ia9e5a5a57bfa7fd4316f8a914ef97effd020262e

18 months agoTests: Introduce gen-ust-events-constructor test application
Mathieu Desnoyers [Fri, 17 Feb 2023 14:57:03 +0000 (09:57 -0500)] 
Tests: Introduce gen-ust-events-constructor test application

This test application tests C/C++ constructor/destructor instrumentation coverage.

* How to use:

lttng create
lttng enable-event -u 'tp*'
lttng start
./gen-ust-events-constructor
lttng stop
lttng view

* Before UST fixes:

[11:57:09.949917277] (+?.?????????) compudjdev tp_so:constructor_c_provider_shared_library: { cpu_id = 6 }, { }
[11:57:09.949962573] (+0.000045296) compudjdev tp_so:constructor_cplusplus_provider_shared_library: { cpu_id = 6 }, { msg = "global - shared library define and provider" }
[11:57:09.952145202] (+0.002182629) compudjdev tp:constructor_cplusplus: { cpu_id = 6 }, { msg = "global - same unit after provider" }
[11:57:09.952146517] (+0.000001315) compudjdev tp:constructor_c_across_units_after_provider: { cpu_id = 6 }, { }
[11:57:09.952146887] (+0.000000370) compudjdev tp:constructor_cplusplus: { cpu_id = 6 }, { msg = "global - across units after provider" }
[11:57:09.952634622] (+0.000487735) compudjdev tp:constructor_cplusplus: { cpu_id = 6 }, { msg = "main() local" }
[11:57:09.952635522] (+0.000000900) compudjdev tp_so:constructor_cplusplus_provider_shared_library: { cpu_id = 6 }, { msg = "main() local - shared library define and provider" }
[11:57:09.952636176] (+0.000000654) compudjdev tp_a:constructor_cplusplus_provider_static_archive: { cpu_id = 6 }, { msg = "main() local - static archive define and provider" }
[11:57:09.952636906] (+0.000000730) compudjdev tp:main: { cpu_id = 6 }, { }
[11:57:09.952637469] (+0.000000563) compudjdev tp_a:destructor_cplusplus_provider_static_archive: { cpu_id = 6 }, { msg = "main() local - static archive define and provider" }
[11:57:09.952638106] (+0.000000637) compudjdev tp_so:destructor_cplusplus_provider_shared_library: { cpu_id = 6 }, { msg = "main() local - shared library define and provider" }
[11:57:09.952638516] (+0.000000410) compudjdev tp:destructor_cplusplus: { cpu_id = 6 }, { msg = "main() local" }
[11:57:09.952681576] (+0.000043060) compudjdev tp:destructor_cplusplus: { cpu_id = 6 }, { msg = "global - across units after provider" }
[11:57:09.952682066] (+0.000000490) compudjdev tp:destructor_cplusplus: { cpu_id = 6 }, { msg = "global - same unit after provider" }
[11:57:09.952729603] (+0.000047537) compudjdev tp_so:destructor_cplusplus_provider_shared_library: { cpu_id = 6 }, { msg = "global - shared library define and provider" }

* After UST fixes:

[11:49:37.921028048] (+?.?????????) compudjdev tp_so:constructor_c_provider_shared_library: { cpu_id = 22 }, { }
[11:49:37.921033701] (+0.000005653) compudjdev tp_a:constructor_c_provider_static_archive: { cpu_id = 22 }, { }
[11:49:37.921036278] (+0.000002577) compudjdev tp_so:constructor_cplusplus_provider_shared_library: { cpu_id = 22 }, { msg = "global - shared library define and provider" }
[11:49:37.921037961] (+0.000001683) compudjdev tp_a:constructor_cplusplus_provider_static_archive: { cpu_id = 22 }, { msg = "global - static archive define and provider" }
[11:49:37.921039431] (+0.000001470) compudjdev tp:constructor_c_across_units_before_define: { cpu_id = 22 }, { }
[11:49:37.921040288] (+0.000000857) compudjdev tp:constructor_cplusplus: { cpu_id = 22 }, { msg = "global - across units before define" }
[11:49:37.921041208] (+0.000000920) compudjdev tp:constructor_c_same_unit_before_define: { cpu_id = 22 }, { }
[11:49:37.921042021] (+0.000000813) compudjdev tp:constructor_c_same_unit_after_define: { cpu_id = 22 }, { }
[11:49:37.921042568] (+0.000000547) compudjdev tp:constructor_cplusplus: { cpu_id = 22 }, { msg = "global - same unit before define" }
[11:49:37.921043161] (+0.000000593) compudjdev tp:constructor_cplusplus: { cpu_id = 22 }, { msg = "global - same unit after define" }
[11:49:37.921044058] (+0.000000897) compudjdev tp:constructor_c_across_units_after_define: { cpu_id = 22 }, { }
[11:49:37.921044585] (+0.000000527) compudjdev tp:constructor_cplusplus: { cpu_id = 22 }, { msg = "global - across units after define" }
[11:49:37.921045585] (+0.000001000) compudjdev tp:constructor_c_same_unit_before_provider: { cpu_id = 22 }, { }
[11:49:37.921046385] (+0.000000800) compudjdev tp:constructor_c_same_unit_after_provider: { cpu_id = 22 }, { }
[11:49:37.921046938] (+0.000000553) compudjdev tp:constructor_cplusplus: { cpu_id = 22 }, { msg = "global - same unit before provider" }
[11:49:37.921047548] (+0.000000610) compudjdev tp:constructor_cplusplus: { cpu_id = 22 }, { msg = "global - same unit after provider" }
[11:49:37.921048428] (+0.000000880) compudjdev tp:constructor_c_across_units_after_provider: { cpu_id = 22 }, { }
[11:49:37.921048918] (+0.000000490) compudjdev tp:constructor_cplusplus: { cpu_id = 22 }, { msg = "global - across units after provider" }
[11:49:37.921050001] (+0.000001083) compudjdev tp:constructor_cplusplus: { cpu_id = 22 }, { msg = "main() local" }
[11:49:37.921050628] (+0.000000627) compudjdev tp_so:constructor_cplusplus_provider_shared_library: { cpu_id = 22 }, { msg = "main() local - shared library define and provider" }
[11:49:37.921051368] (+0.000000740) compudjdev tp_a:constructor_cplusplus_provider_static_archive: { cpu_id = 22 }, { msg = "main() local - static archive define and provider" }
[11:49:37.921052098] (+0.000000730) compudjdev tp:main: { cpu_id = 22 }, { }
[11:49:37.921052758] (+0.000000660) compudjdev tp_a:destructor_cplusplus_provider_static_archive: { cpu_id = 22 }, { msg = "main() local - static archive define and provider" }
[11:49:37.921053758] (+0.000001000) compudjdev tp_so:destructor_cplusplus_provider_shared_library: { cpu_id = 22 }, { msg = "main() local - shared library define and provider" }
[11:49:37.921054595] (+0.000000837) compudjdev tp:destructor_cplusplus: { cpu_id = 22 }, { msg = "main() local" }
[11:49:37.921055698] (+0.000001103) compudjdev tp:destructor_cplusplus: { cpu_id = 22 }, { msg = "global - across units after provider" }
[11:49:37.921056455] (+0.000000757) compudjdev tp:destructor_cplusplus: { cpu_id = 22 }, { msg = "global - same unit after provider" }
[11:49:37.921057011] (+0.000000556) compudjdev tp:destructor_cplusplus: { cpu_id = 22 }, { msg = "global - same unit before provider" }
[11:49:37.921057558] (+0.000000547) compudjdev tp:destructor_cplusplus: { cpu_id = 22 }, { msg = "global - across units after define" }
[11:49:37.921058188] (+0.000000630) compudjdev tp:destructor_cplusplus: { cpu_id = 22 }, { msg = "global - same unit after define" }
[11:49:37.921058658] (+0.000000470) compudjdev tp:destructor_cplusplus: { cpu_id = 22 }, { msg = "global - same unit before define" }
[11:49:37.921059168] (+0.000000510) compudjdev tp:destructor_cplusplus: { cpu_id = 22 }, { msg = "global - across units before define" }
[11:49:37.921059768] (+0.000000600) compudjdev tp_a:destructor_cplusplus_provider_static_archive: { cpu_id = 22 }, { msg = "global - static archive define and provider" }
[11:49:37.921060445] (+0.000000677) compudjdev tp_so:destructor_cplusplus_provider_shared_library: { cpu_id = 22 }, { msg = "global - shared library define and provider" }
[11:49:37.921067265] (+0.000006820) compudjdev tp:destructor_c_across_units_after_provider: { cpu_id = 22 }, { }
[11:49:37.921067901] (+0.000000636) compudjdev tp:destructor_c_same_unit_after_provider: { cpu_id = 22 }, { }
[11:49:37.921068515] (+0.000000614) compudjdev tp:destructor_c_same_unit_before_provider: { cpu_id = 22 }, { }
[11:49:37.921069128] (+0.000000613) compudjdev tp:destructor_c_across_units_after_define: { cpu_id = 22 }, { }
[11:49:37.921069831] (+0.000000703) compudjdev tp:destructor_c_same_unit_after_define: { cpu_id = 22 }, { }
[11:49:37.921070445] (+0.000000614) compudjdev tp:destructor_c_same_unit_before_define: { cpu_id = 22 }, { }
[11:49:37.921071075] (+0.000000630) compudjdev tp:destructor_c_across_units_before_define: { cpu_id = 22 }, { }
[11:49:37.921071721] (+0.000000646) compudjdev tp_a:destructor_c_provider_static_archive: { cpu_id = 22 }, { }
[11:49:37.921072605] (+0.000000884) compudjdev tp_so:destructor_c_provider_shared_library: { cpu_id = 22 }, { }

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I4572c2548acf5e295f70e88137ab12b3b86d17c9

18 months agoFix: io-hint: add missing include for off_t
Michael Jeanson [Thu, 27 Apr 2023 17:08:16 +0000 (13:08 -0400)] 
Fix: io-hint: add missing include for off_t

Change-Id: I73ca36d43c7a9b9b5f67e77e835426964b315f65
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoBuild fix: g++ 4.8 incorrectly disambiguates enum and member
Jérémie Galarneau [Wed, 26 Apr 2023 22:13:02 +0000 (18:13 -0400)] 
Build fix: g++ 4.8 incorrectly disambiguates enum and member

g++ 4.8 fails to build with the following error:

  commands/start.cpp: In function ‘cmd_error_code {anonymous}::start_tracing(const session_spec&)’:
  commands/start.cpp:123:76: error: ‘session_spec::type’ is not a class, namespace, or enumeration
    if (!listing_failed && sessions.size() == 0 && spec.type == session_spec::type::NAME) {
                                                                              ^
  commands/start.cpp:144:36: error: ‘session_spec::type’ is not a class, namespace, or enumeration
       if (spec.type != session_spec::type::NAME) {
                                    ^

The `type` member is renamed to type_ to workaround this compiler bug.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Id46ca4219d4d96db71a9d4523c3571303b2e97a7

18 months agoTest: client: start, stop, destroy: add tests for --glob/--all
Jérémie Galarneau [Fri, 21 Apr 2023 19:48:56 +0000 (15:48 -0400)] 
Test: client: start, stop, destroy: add tests for --glob/--all

Test the CLI client's start, stop, and destroy commands along with their
--all and --glob options.

The tests validate that only the targeted sessions are affected by the
various commands and that the commands don't error-out when multiple
sessions are targetted.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ie39e999608a063cc4573d790120fbe0896917d6f

18 months agolttng: rename iterator_template to _iterator
Jérémie Galarneau [Fri, 21 Apr 2023 19:11:44 +0000 (15:11 -0400)] 
lttng: rename iterator_template to _iterator

iterator_template is not meant to be used directly and is private: it
should be prefixed with an underscore.

Moreover, "template" in the name doesn't really add anything; remove it.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Id891afeb596788d8d40cdf45e3f50dd8bf0427cc

18 months agoMove create_unique_class util to the memory namespace
Jérémie Galarneau [Fri, 21 Apr 2023 18:48:53 +0000 (14:48 -0400)] 
Move create_unique_class util to the memory namespace

create_unique_class is helpful to write unique_ptr wrappers and is now
accessed in numerous places even though it lives in the `details`
namespace.

Moving it to the `memory` namespace to live with other memory management
facilities.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Id4bb5100c1eb3a7e1e2d65f5b2d40ff8f97c786e

18 months agolttng: destroy: ensure a cmd_error_code is returned by the command
Jérémie Galarneau [Thu, 20 Apr 2023 21:01:14 +0000 (17:01 -0400)] 
lttng: destroy: ensure a cmd_error_code is returned by the command

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I7adef3df9b0a76de893341131cd5d0da2c9ab5df

18 months agoClean-up: lttng-destroy: move static symbols to anonymous namespace
Jérémie Galarneau [Thu, 20 Apr 2023 18:40:32 +0000 (14:40 -0400)] 
Clean-up: lttng-destroy: move static symbols to anonymous namespace

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Iebea98532e1c6d0c7309c0ea40e6585a25b8b3df

18 months agoTest: mi: inverted logic in stop validation test
Jérémie Galarneau [Wed, 26 Apr 2023 02:24:17 +0000 (22:24 -0400)] 
Test: mi: inverted logic in stop validation test

Stopping a session twice should succeed (no-op). Moreover, the test
mentions it tests a 'start' while it tests a 'stop' operation.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I4c8f19f0ecc181921fb5e3dd4f882e3c2285adcd

18 months agolttng: stop: ensure a cmd_error_code is returned by the command
Jérémie Galarneau [Thu, 20 Apr 2023 16:34:35 +0000 (12:34 -0400)] 
lttng: stop: ensure a cmd_error_code is returned by the command

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Iee537cbda297cee72a1d5ad49738ac347f42d3fd

18 months agoClean-up: lttng-stop: move static symbols to anonymous namespace
Jérémie Galarneau [Thu, 20 Apr 2023 15:54:57 +0000 (11:54 -0400)] 
Clean-up: lttng-stop: move static symbols to anonymous namespace

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I4cb91315993ffa4f0f53698f7912540fe2aa4075

18 months agoClean-up: rotation-thread: disable move and copy
Jérémie Galarneau [Thu, 20 Apr 2023 15:47:22 +0000 (11:47 -0400)] 
Clean-up: rotation-thread: disable move and copy

Disable unused move and copy constructors and assignment operators, as
reported by clang-tidy.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I610e60dd082bc7c552a6f304ea44e9970487e558

18 months agolttng: start: ensure a cmd_error_code is returned by the command
Jérémie Galarneau [Wed, 19 Apr 2023 19:15:50 +0000 (15:15 -0400)] 
lttng: start: ensure a cmd_error_code is returned by the command

The start_tracing functions mix cmd_error_code and lttng_error_code
values in "raw" integers which is unexpected by the top-level client.

For instance, the client returns '80' when attempting to start a session
that is already active.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I12c15e8aa3eb960e1e47d5166307995af8c46989

18 months agolttng: start: move static symbols to anonymous namespace
Jérémie Galarneau [Wed, 19 Apr 2023 19:15:26 +0000 (15:15 -0400)] 
lttng: start: move static symbols to anonymous namespace

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I295b39aa2f286bc494a0d2eb0b5c8528e0b6afc3

18 months agolttng: Add --glob option to lttng-destroy
Olivier Dion [Mon, 6 Feb 2023 22:19:36 +0000 (17:19 -0500)] 
lttng: Add --glob option to lttng-destroy

Change-Id: I930adc74e1ab2d285f99e0aef01ba1108df089a4
Signed-off-by: Olivier Dion <odion@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agolttng: Add --all, --glob options to lttng-stop
Olivier Dion [Mon, 6 Feb 2023 21:11:56 +0000 (16:11 -0500)] 
lttng: Add --all, --glob options to lttng-stop

Change-Id: Ida7c8f68f9b52f7ab4414bf060383864bd2e3046
Signed-off-by: Olivier Dion <odion@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agolttng: Add --all, --glob options to lttng-start
Olivier Dion [Mon, 6 Feb 2023 21:06:10 +0000 (16:06 -0500)] 
lttng: Add --all, --glob options to lttng-start

Change-Id: I8ff806c7ea7a51b8fa69206bd427b5e106706073
Signed-off-by: Olivier Dion <odion@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agolttng: Add list_sessions utility
Olivier Dion [Mon, 6 Feb 2023 20:55:39 +0000 (15:55 -0500)] 
lttng: Add list_sessions utility

Get a list of sessions given a session specification.

The `NAME' specification returns the session that has the given
name. The `GLOB_PATTERN' specification returns all sessions that match a
pattern. The `ALL' specification returns all sessions.

Change-Id: If69698d6dd59d54ba16669571ef49ed5bb9b8997
Signed-off-by: Olivier Dion <odion@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoFix: mi: Pass const session to mi_lttng_session
Olivier Dion [Tue, 28 Feb 2023 22:02:38 +0000 (17:02 -0500)] 
Fix: mi: Pass const session to mi_lttng_session

There's no reason for session to be not constant.

Change-Id: I55d63e142853f78ba643600b5c1869866ee1bb5e
Signed-off-by: Olivier Dion <odion@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoClean-up: clang-tidy autofixes to eventfd and file-descriptor
Jérémie Galarneau [Tue, 18 Apr 2023 21:57:46 +0000 (17:57 -0400)] 
Clean-up: clang-tidy autofixes to eventfd and file-descriptor

eventfd must be marked explicit to prevent erroneous implicit
conversions.

A destructor is provided since other special member functions are
defined (see cppcoreguidelines-special-member-functions).

file_descriptor's constructor is replaced by a trivial constructor.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I1623a2f8db0d613201a534293f5e1476b779283c

18 months agoTests: utils: lttng_pgrep spams output when racing with a process
Jérémie Galarneau [Thu, 20 Apr 2023 15:07:44 +0000 (11:07 -0400)] 
Tests: utils: lttng_pgrep spams output when racing with a process

lttng_pgrep is often used to check if a process is alive. As such, it is
often used on PIDs which are tearing down.

The file redirection used in `tr '\0' '\n' < /proc/"$pid"/cmdline` often
fails (which is correct) because the /proc/$pid folder no longer exists.

When this occurs, the test output is cluttered with annoying errors like:
  ./tests/regression/kernel//../../utils/utils.sh: line 151: /proc/845/cmdline: No such file or directory

This part of the command now runs under a subshell to hide the error
when it occurs.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I6a26cb63cd56c46557a73e2e475b0cac729cc67f

18 months agoTests: enable test_callstack on 32-bit x86
Jérémie Galarneau [Wed, 19 Apr 2023 21:48:25 +0000 (17:48 -0400)] 
Tests: enable test_callstack on 32-bit x86

The test application used by test_callstack defines syscall
stubs (instead of using the libc) for both 32 and 64 bit variants of
x86. This limits the architectures that can run this test.

However, the `uname` check is erroneous as it assumes that `uname -m`
will return x86 for both architectures. It doesn't; it returns i386 or
i686 (and I presume others) for 32-bit kernels.

As such, the check is modified to check for '86' which, as far as I
know, doesn't clash with other architectures.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I267a81fadb2f1db6b135c6886ae5700184f2ae5b

18 months agoTests: fix: kernel/test_callstack: number of tests on i386
Michael Jeanson [Wed, 19 Apr 2023 18:28:43 +0000 (14:28 -0400)] 
Tests: fix: kernel/test_callstack: number of tests on i386

The number of planned tests is incorrect when not running the userspace
callstack tests which is limited to x86_64.

Fixes the following error:

  ERROR: kernel/test_callstack 12 - Wait after kill session daemon # UNPLANNED
  # Looks like you planned 11 tests but ran 1 extra.
  ERROR: kernel/test_callstack - too many tests run (expected 11, got 12)
  ERROR: kernel/test_callstack - exited with status 1

Change-Id: Icf662968ac977b08594eca99e18476e43cc4ea79
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoAdd getrandom compat for MacOS, FreeBSD and Cygwin
Michael Jeanson [Tue, 18 Apr 2023 21:58:01 +0000 (17:58 -0400)] 
Add getrandom compat for MacOS, FreeBSD and Cygwin

Use the BSD arc4random_buf() function which should be non-blocking on
all of these platforms.

Change-Id: Ib43373cad82373dc83995fdb3d01c2a2d43ab683
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoTests: metadata-regeneration: restore date at the end of the test
Jérémie Galarneau [Tue, 18 Apr 2023 18:58:04 +0000 (14:58 -0400)] 
Tests: metadata-regeneration: restore date at the end of the test

The metadata-regeneration test sets the date is the past to validate
that the clock offset is re-computed when regenerating a trace's
metadata.

In doing so, it leaves the time in the past which causes 'make' to panic
when it checks for changes while continuing to evaluate the 'check'
target.

  make[4]: Entering directory '/root/workspace/lttng-tools_master_rootbuild_i386/babeltrace_version/stable-2.0/build/std/conf/agents/liburcu_version/master/node/i386-rootnode/platform/deb11-i386/test_type/base/src/lttng-tools/tests/perf'
  make[4]: Warning: File '.deps/find_event.Po' has modification time 1363500490 s in the future
  ============================================================================
  Testsuite summary for lttng-tools 2.14.0-pre
  ============================================================================
  # TOTAL: 0
  # PASS:  0
  # SKIP:  0
  # XFAIL: 0
  # FAIL:  0
  # XPASS: 0
  # ERROR: 0
  ============================================================================
  make[4]: warning:  Clock skew detected.  Your build may be incomplete.
  make[4]: Leaving directory '/root/workspace/lttng-tools_master_rootbuild_i386/babeltrace_version/stable-2.0/build/std/conf/agents/liburcu_version/master/node/i386-rootnode/platform/deb11-i386/test_type/base/src/lttng-tools/tests/perf'
  make[3]: warning:  Clock skew detected.  Your build may be incomplete.
  make[3]: Leaving directory '/root/workspace/lttng-tools_master_rootbuild_i386/babeltrace_version/stable-2.0/build/std/conf/agents/liburcu_version/master/node/i386-rootnode/platform/deb11-i386/test_type/base/src/lttng-tools/tests/perf'
  make[2]: warning:  Clock skew detected.  Your build may be incomplete.
  make[2]: Leaving directory '/root/workspace/lttng-tools_master_rootbuild_i386/babeltrace_version/stable-2.0/build/std/conf/agents/liburcu_version/master/node/i386-rootnode/platform/deb11-i386/test_type/base/src/lttng-tools/tests/perf'
  make[1]: *** [Makefile:557: check-recursive] Error 1

The date is sampled at the beginning of the test and restored when it
ends. This leaves the system with a wrong time (offset by the duration
of the test itself). Still, its better than being 40 years in the past.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I4a128b57d4d9fd61eec097948b688060815f4a4c

18 months agoBuild fix: add a noop compat wrapper for posix_fadvise
Michael Jeanson [Tue, 18 Apr 2023 16:11:33 +0000 (12:11 -0400)] 
Build fix: add a noop compat wrapper for posix_fadvise

This allows building on platforms without posix_fadvise.

Change-Id: I13fd6404cd02eb8038a97693db27d9619246401d
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoClean-up: error.hpp/error.cpp coding style fix
Jérémie Galarneau [Tue, 18 Apr 2023 15:44:42 +0000 (11:44 -0400)] 
Clean-up: error.hpp/error.cpp coding style fix

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I570dabdc2ea83bf9aded48e64fc9e1f83a061044

18 months agoBuild fix: missing error_get_str on non-glibc builds
Michael Jeanson [Tue, 18 Apr 2023 15:29:21 +0000 (11:29 -0400)] 
Build fix: missing error_get_str on non-glibc builds

The function declaration was erroneously moved inside this ifdef. This
breaks non glibc builds.

Introduced in :

  commit 003f455dab0204dd3f066ecdbea0470035f8181f
  Author: Jérémie Galarneau <jeremie.galarneau@efficios.com>
  Date:   Thu Apr 13 14:31:33 2023 -0400

    Fix: logging: unhandled error in *_FMT macros

    Coverity reports:

    1508779 Uncaught exception
    If the exception is ever thrown, the program will crash.

    In lttng::​sessiond::​rotation_thread::​_thread_function(): A C++ exception
    is thrown but never caught (CWE-248)

    The *_FMT macros, which use fmtlib, don't handle the case where
    fmt::format throws. This can happen, in particular, when an invalid
    format string is used.

    The macros are modified to log the exception and abort.

Change-Id: I5eb3b2a673e224f3c99cae7faece31175084db9d
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoClean-up: remove unnecessary inclusion
Jérémie Galarneau [Tue, 18 Apr 2023 15:42:04 +0000 (11:42 -0400)] 
Clean-up: remove unnecessary inclusion

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I7f8b875fe2cdcf7909a953bb6061229c4a5bca71

18 months agoBuild fix: missing header on macOS
Jérémie Galarneau [Tue, 18 Apr 2023 15:28:22 +0000 (11:28 -0400)] 
Build fix: missing header on macOS

The build fails on macOS (on both ARM64 and AMD64 platforms):
  exception.cpp:32:41: error: use of undeclared identifier 'error_get_str'
          runtime_error(msg + ": " + std::string(error_get_str(error_code)),
                                                 ^

error_get_str is defined in lttng/lttng-error.h

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I69fa0c0bc442d0cb28779f6b4c55d0b6a7196791

18 months agoBuild fix: failure on macOS caused by missing space in Makefile
Michael Jeanson [Tue, 18 Apr 2023 15:06:56 +0000 (11:06 -0400)] 
Build fix: failure on macOS caused by missing space in Makefile

Change-Id: Ia30100d293ad52e422998512d44173af16858257
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
18 months agoBuild fix: common: eventfd only exists on Linux
Jérémie Galarneau [Wed, 12 Apr 2023 18:53:37 +0000 (14:53 -0400)] 
Build fix: common: eventfd only exists on Linux

The project fails to build on non-Linux platforms since eventfd is a
Linux-exclusive facility.

From the project's point of view, the eventfd util belongs in libcommon.
However, we will need to write a wrapper if it ends up being used on
non-Linux platform.

For the moment, exclude it from the internal libcommon sources when
building on non-Linux platforms as it is only used on the session
daemon.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: If528ac522d72a95e87a4f496531ea679a81030a2

18 months agoReplace uses of the URCU tls helpers by the standard thread_local
Jérémie Galarneau [Mon, 17 Apr 2023 18:46:56 +0000 (14:46 -0400)] 
Replace uses of the URCU tls helpers by the standard thread_local

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I6751ad8c3a121638b07d333ac6f28547b25f54f2

18 months agoClean-up: use const reference where possible
Jérémie Galarneau [Thu, 13 Apr 2023 18:41:43 +0000 (14:41 -0400)] 
Clean-up: use const reference where possible

These exceptions can all be caught by const reference.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I11a4f5018c838d77212340efa6f94d5d1c005ed6

18 months agoCoverity warning: sessiond: uncaught exception in main
Jérémie Galarneau [Thu, 13 Apr 2023 18:34:31 +0000 (14:34 -0400)] 
Coverity warning: sessiond: uncaught exception in main

Coverity reports:
1508778 Uncaught exception
If the exception is ever thrown, the program will crash.

In main: A C++ exception is thrown but never caught (CWE-248)

In particular, Coverity reports that pthread_mutex_lock can error-out,
which would cause an lttng::posix_error exception to be thrown.

This isn't particularly likely to happen, but it is nonetheless
preferable to catch exceptions at the top-level and log them before
exiting.

Change-Id: I4f7a52db3c9cd19764e7d12fd62afa60af99dabd
Reported-by: Coverity Scan
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoFix: logging: unhandled error in *_FMT macros
Jérémie Galarneau [Thu, 13 Apr 2023 18:31:33 +0000 (14:31 -0400)] 
Fix: logging: unhandled error in *_FMT macros

Coverity reports:

1508779 Uncaught exception
If the exception is ever thrown, the program will crash.

In lttng::​sessiond::​rotation_thread::​_thread_function(): A C++ exception
is thrown but never caught (CWE-248)

The *_FMT macros, which use fmtlib, don't handle the case where
fmt::format throws. This can happen, in particular, when an invalid
format string is used.

The macros are modified to log the exception and abort.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I7f4a066b418a9d544a679f773df7e94640755f47

18 months agoClean-up: common: error_log_time doesn't need to be global
Jérémie Galarneau [Mon, 17 Apr 2023 18:25:47 +0000 (14:25 -0400)] 
Clean-up: common: error_log_time doesn't need to be global

error_log_time is only used in error.cpp. Reduce its visibility to the
file.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ifbd821af12d7378b203cd7a2c1d48d28ed00cb40

18 months agoTests: select_poll_epoll: Add support for _time64
Jérémie Galarneau [Fri, 11 Nov 2022 22:35:12 +0000 (17:35 -0500)] 
Tests: select_poll_epoll: Add support for _time64

Add support for the 64-bit time_t syscalls SYS_ppoll_time64
and SYS_pselect6_time64.

These syscalls exist on 32-bit platforms since the 5.1 kernel. 32-bit
platforms with a 64-bit time_t only have these and don't have the
original syscalls (such as 32-bit RISC-V).

In doing so, the original syscalls were renamed to add the `_time32`
suffix which causes the validation steps to fail.

This patch ensures that the 64-bit version of the pselect and ppoll
syscalls are called whenever they are available, allowing the tests to
succeed.

It also ensures that we don't attempt to use the 32-bit versions that
don't exist on newer 32-bit platforms like RISCV-32.

The test is also cleaned-up:

  - The *invalid_pointer, *invalid_fd, *ulong_max, and *buffer_overflow
    tests are identical except for the syscall(...) invocation. They are
    combined to share as much code as possible regardless of which
    syscalls the platform's ABI supports.

  - Harmonized test names between the test script and test application

  - Test names are printed when using the list option and used to launch
    a test (rather than a numeric id)

  - Allow the test application to print the list of supported tested
    syscalls

Fixes: https://github.com/lttng/lttng-tools/pull/162
Change-Id: I974f780022441fedfa45414d672092606e657cf6
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoRemove fcntl wrapper
Michael Jeanson [Tue, 17 Jan 2023 22:49:42 +0000 (17:49 -0500)] 
Remove fcntl wrapper

Replace the questionnable sync_file_range wrapper by more descriptive
util functions. Remove the unimplemented splice wrapper, I'd rather have
a build failure / adjust the build system on some platforms than have
hard to diagnose runtime issues.

Change-Id: I4114d0d9765ae3d95a1488c945e5d66a20c2029d
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoBuild fix: brace-enclosed initlializer lists error with g++ 4.8
Michael Jeanson [Wed, 12 Apr 2023 18:14:21 +0000 (14:14 -0400)] 
Build fix: brace-enclosed initlializer lists error with g++ 4.8

A build error occurs when building using g++ 4.8 :

rotation-thread.cpp: In constructor 'lttng::sessiond::rotation_thread::rotation_thread(lttng::sessiond::rotation_thread_timer_queue&, notification_thread_handle&)':
rotation-thread.cpp:400:58: error: invalid initialization of non-const reference of type 'lttng::sessiond::rotation_thread_timer_queue&' from an rvalue of type '<brace-enclosed initializer list>'
  _notification_thread_handle{ notification_thread_handle }

Use old-style initialization of references instead.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ia3392a88b8a2d8dd8c60330c16229f507338e7cd

18 months agoFix: warning: "HAVE_GETIPNODEBYNAME" is not defined
Michael Jeanson [Tue, 28 Mar 2023 16:06:00 +0000 (12:06 -0400)] 
Fix: warning: "HAVE_GETIPNODEBYNAME" is not defined

Change-Id: I3214a63daea3c2d44f8712127cd0d776d429f130
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoExtras: python bindings: update context types
Christophe Bedard [Mon, 20 Feb 2023 21:20:51 +0000 (13:20 -0800)] 
Extras: python bindings: update context types

This adds context types from LTTNG_EVENT_CONTEXT_CALLSTACK_KERNEL (20)
to LTTNG_EVENT_CONTEXT_TIME_NS (41) so that the list matches
lttng_event_context_type in include/lttng/event.h.

Change-Id: Ied908aa51cf75e931794acef61271468efeff6a7
Signed-off-by: Christophe Bedard <christophe.bedard@apex.ai>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoDocs: lttng-add-context(1): fix typo
Christophe Bedard [Tue, 21 Feb 2023 20:31:11 +0000 (12:31 -0800)] 
Docs: lttng-add-context(1): fix typo

Change-Id: Ie6d182e00d2aae07f8dd405e3b4b9ec8205ad1da
Signed-off-by: Christophe Bedard <christophe.bedard@apex.ai>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
18 months agoTests: fix: test_list_triggers_cli fails to list userspace-probe-sdt trigger
Jérémie Galarneau [Fri, 14 Apr 2023 18:57:06 +0000 (14:57 -0400)] 
Tests: fix: test_list_triggers_cli fails to list userspace-probe-sdt trigger

The listing of triggers which use an event rule match condition
consisting in a user space probe set on an SDT probe fails since
28f23191d.

The coding style imposes an order of includes. However, the order in
which the probe declarations generated by systemtap vs sdt.h matters.

From SYSTEMTAP(2):
  Sometimes, semaphore variables are not necessary nor helpful. Skipping
  them can simplify the build process, by omitting the extra "test.o"
  file. To skip dependence upon semaphore variables, include "<sys/sdt.h>"
  within the application before "test.h":
  [...]
  In this mode, the ENABLED() test is fixed at 1.

The reformatted version of userspace-probe-sdt-binary.c includes sdt.h
after the probe causing the probes to use a guarding semaphore.

Unfortunately, we can't instrument such probes and the registration of
the trigger silently fails. The silent failure is addressed by a
follow-up commit.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I5146f55ed5d9d109f1f7bc32e0f7c2c8bf839f8e

18 months agoFix: sessiond: silent kernel notifier registration error
Jérémie Galarneau [Fri, 14 Apr 2023 18:39:05 +0000 (14:39 -0400)] 
Fix: sessiond: silent kernel notifier registration error

When a kernel notifier fails to be registered, the error is silently
ignored because of a missing jump to the error label.

This was noticed while debugging an unrelated problem where the kernel
tracer would fail to add a userspace probe to a semaphore-protected SDT
probe.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I9261ad7131b1b53152fe8960f17a6fca7029440f

18 months agoTests: fix: list_triggers_cli: kallsyms contains prefixed symbols
Jérémie Galarneau [Thu, 13 Apr 2023 19:50:57 +0000 (15:50 -0400)] 
Tests: fix: list_triggers_cli: kallsyms contains prefixed symbols

The test_list_triggers_cli test fails with:

  # Listing event-rule-matches kernel probe
  ./tests/regression/tools/trigger/test_list_triggers_cli: line 808: [[: 0xffffffffc1fca020
  ffffffffc1fca030: syntax error in expression (error token is "ffffffffc1fca030")
  ./tests/regression/tools/trigger/test_list_triggers_cli: line 813: 0xffffffffc1fca020
  ffffffffc1fca030 - 0xffffffffc1fca0c0
  ffffffffc1fca0b0 : syntax error in expression (error token is "ffffffffc1fca030 - 0xffffffffc1fca0c0
  ffffffffc1fca0b0 ")

This is due to the fact that /proc/kallsyms now contains prefixed
symbols (e.g. `__pfx_lttng_channel_enable`) which cause the test to fail
since the grep invocation doesn't expect more than one match.

Matching the begin/end of the "word" (or rather, function name) allows
us to check for exact matches only.

https://github.com/torvalds/linux/commit/9f2899fe36a623885d8576604cb582328ad32b3c

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ifc04757719c733caf55c8eea447e18a2246a9f49

18 months ago.git-blame-ignore-revs: add reformat commit
Jérémie Galarneau [Fri, 14 Apr 2023 20:45:18 +0000 (16:45 -0400)] 
.git-blame-ignore-revs: add reformat commit

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: If722c422f56d45720cae933f3d7fac4f650c4bc5

19 months agoClean-up: run format-cpp on the tree
Jérémie Galarneau [Wed, 12 Apr 2023 15:57:50 +0000 (11:57 -0400)] 
Clean-up: run format-cpp on the tree

The original re-format commit missed a number of files that were caught
by format-cpp. Hopefully this is the last large reformat commit for a
while.

Change-Id: I493ee6d9fe6187e0bd087c68ed346af69c929c1e
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
19 months agoclang-format: specify bitfield spacing to fit with the existing code
Jérémie Galarneau [Wed, 12 Apr 2023 16:04:06 +0000 (12:04 -0400)] 
clang-format: specify bitfield spacing to fit with the existing code

Change-Id: I46732823ad8341ca0e0c2e55b6b58e3e435f855a
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
19 months agoAdd a code formatting script
Jérémie Galarneau [Wed, 12 Apr 2023 15:39:33 +0000 (11:39 -0400)] 
Add a code formatting script

Add a code formatting script derived from the one provided in the
Babeltrace tree.

Change-Id: Idaf127ac199d1783769b7fe6a3216113bd9b7e83
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
19 months agoCleanup: rotation-thread: enforce conding standard following fix
Jérémie Galarneau [Tue, 4 Apr 2023 17:45:24 +0000 (13:45 -0400)] 
Cleanup: rotation-thread: enforce conding standard following fix

A fix introducing
rotate_notification_channel_subscription_change_eventfd didn't follow
the current coding standard so as to make it easier to backport to the
stable branches.

Clean-up the affected code to follow the current standard:
  - Replace the use of a raw eventfd to use the eventfd utility,
  - Subscribe and unsubscribe functions made use of global variables to
    communicate with the rotation thread: replace that with the
    rotation_thread class to centralize the interface,
  - Make the code using eventfd exception-safe (automatic memory
    management, use of various RAII utils),
  - Replacement of non-null pointers by references.

Change-Id: I7e363e21b829fd0939a336aca2570fdbcc346967
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
19 months agovendor: fmtlib: Upgrade fmtlib to 9.1.0
Jérémie Galarneau [Tue, 11 Apr 2023 20:24:43 +0000 (16:24 -0400)] 
vendor: fmtlib: Upgrade fmtlib to 9.1.0

gcc warns that:

  declaration of ‘struct fmt::v8::detail::parse_format_string(fmt::v8::basic_string_view, Handler&&) [with bool IS_CONSTEXPR = false; Char = char; Handler = fmt::v8::detail::vformat_to(fmt::v8::detail::buffer&, fmt::v8::basic_string_view, fmt::v8::basic_format_args::type, char>::value, fmt::v8::appender, std::back_insert_iterator::type> > >::type, typename fmt::v8::type_identity::type> >, fmt::v8::detail::locale_ref) [with Char = char; typename fmt::v8::type_identity::type = char; typename std::conditional::type, char>::value, fmt::v8::appender, std::back_insert_iterator::type> > >::type = fmt::v8::appender]::format_handler]::writer’ shadows a global declaration [-Wshadow]
  struct writer {
  ^~~~~~
  commands/start.cpp:22:26: note: shadowed declaration is here
  static struct mi_writer *writer;
  ^~~~~~
  In file included from ../../../src/common/format.hpp:19:0,

This problem was fixed in more recent versions of fmtlib than the one we
vendorized (8.1.0): https://github.com/fmtlib/fmt/issues/1688

Upgrade the vendorized fmtlib to the latest stable release since it
fixes a number of similar warnings. However, the fix described in the
issue had to be re-applied as c06851456 (in fmtlib's tree) reintroduces
the problem.

A format_as helper function must be provided to format enums since this
version, as seen in ust-field-convert.cpp.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I5092d1c348670ec358d571f19d3598ee7662cd21

19 months agoFix: sessiond: size-based notification occasionally not triggered
Jérémie Galarneau [Tue, 4 Apr 2023 15:03:03 +0000 (11:03 -0400)] 
Fix: sessiond: size-based notification occasionally not triggered

Issue observed
==============

When tracing to multiple sessions with scheduled size-based rotations
that occur simultaneously (typically because they trace the same events
and use the same rotation schedule configuration), the start of some
rotations seems to be delayed indefinitely.

Cause
=====

The size-based rotations are implemented by piggy-backing onto the
channel monitoring facilities.

Essentially, a per-channel timer samples a number of statistics on the
consumer daemon end, which transmits them to the session daemon.

The session daemon's notification subsystem evaluates the statistics
against the various registered triggers bound to the channels being
monitored when a statistics sample is received.

To implement size-based rotations, internal triggers are registered with
the "consumed size" condition set to a given threshold. A session
rotation management thread (which also performs other tasks) uses a
notification channel to wait for sessions to reach their target size,
starts rotations as needed, and sets a new threshold according to the
sessions' configured rotation schedule.

The rotation thread uses liblttng-ctl's API to consume notifications
from a notification channel.

At any time, a notification channel may have multiple notifications
queued-up internally in its buffers. This is because a notification
channel multiplexes command replies and notifications over the same UNIX
socket. The current protocol specifies that multiple notifications can
be received before the reply to a command.

In such cases, the notification channel client implementation internally
queues them and provides them on the next calls to
lttng_notification_channel_get_next_notification().

This is correct with respect to the public API, which is intended to be
used in "blocking mode". However, this internal user uses the
notification channel's raw file descriptor to wake-up when a
notification is available.

This is problematic because notifications may be queued by the
notification channel (and thus removed from the socket) while waiting
for command replies (subscribing and unsubscribing from notification
conditions). In such a case, a notification is available but the
rotation thread does not wake-up to consume it as nothing is available
in the socket's buffer.

When this happens, a session that is supposed to rotate automatically
appears to grow indefinitely. It will typically eventually rotate as new
notifications become available and cause the rotation thread to wake-up.
However, a "lag" builds up as the notification that caused the wake-up
is not consumed. Instead, the last buffered notification is provided to
the rotation thread.

Solution
========

Use an event_fd to wake-up the rotation thread whenever a command
completes on the notification channel. This ensures that any
notification that was queued while waiting for a reply to the command is
eventually consumed.

Known drawbacks
===============

None.

Note
====

The use of C++ features is kept to a minimum in this patch in order to
make it easier to backport to the stable releases. A clean-up patch
follows and makes the code conform to the coding standards.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I8974b10124704d1e66e8da32d495fee738e3d43f

19 months agoAdd the lttng::eventfd class
Jérémie Galarneau [Wed, 29 Mar 2023 21:15:20 +0000 (17:15 -0400)] 
Add the lttng::eventfd class

Add an RAII wrapper around the use of eventfd(), extending the
file_descriptor class. The implementation of file_descriptor is moved to
its own TU to make clean-up the interface.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: Ie177018ce8ffe24e78f1be82bdd2f77ba9b19e32

19 months agoFix: file-descriptor: missing include guards
Jérémie Galarneau [Wed, 29 Mar 2023 20:18:36 +0000 (16:18 -0400)] 
Fix: file-descriptor: missing include guards

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I05551e67a28e75b353f22e8df9f2ecde8dad5f5b

19 months agofile-desrcriptor: add assignment operator
Jérémie Galarneau [Wed, 29 Mar 2023 19:13:18 +0000 (15:13 -0400)] 
file-desrcriptor: add assignment operator

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I65ec468e0825801db47da6b1298d0bc09028415d

19 months agoFix: file-descriptor: unnecessary assert in move constructor
Jérémie Galarneau [Wed, 29 Mar 2023 17:41:26 +0000 (13:41 -0400)] 
Fix: file-descriptor: unnecessary assert in move constructor

There is no use in checking the current fd in the move constructor. This
is probably a left-over from the inital move assignment operator.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I416d2778784ddea448904118c940914c030bf399

19 months agoDocs: missing period at the end of comment
Jérémie Galarneau [Wed, 29 Mar 2023 17:32:02 +0000 (13:32 -0400)] 
Docs: missing period at the end of comment

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Change-Id: I62fcddcfa57289a2177acd25931fc1962abb206b

19 months agoPython bindings: silence warnings in generated code
Michael Jeanson [Tue, 4 Apr 2023 19:19:29 +0000 (15:19 -0400)] 
Python bindings: silence warnings in generated code

Add -Wnull-dereference to the list of ignored flags for swig generated
code. This triggers on SWIG 3.0.12.

Change-Id: Idf5da19666581ac97f7120520d5dcd03eb00d0a7
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
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