lttng-ust.git
9 years agoFix: Argument with 'nonnull' attribute passed null
Mathieu Desnoyers [Mon, 21 Sep 2015 19:47:09 +0000 (15:47 -0400)] 
Fix: Argument with 'nonnull' attribute passed null

Reported by scan-build
API Argument with 'nonnull' attribute passed null libringbuffer
/ring_buffer_backend.c 380
API Argument with 'nonnull' attribute passed null libringbuffer
/ring_buffer_backend.c  420

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoCleanup: Unnecessary bit shift
Jonathan Rajotte [Mon, 21 Sep 2015 18:31:33 +0000 (14:31 -0400)] 
Cleanup: Unnecessary bit shift

Reported by cppcheck [1].

[1]
https://ci.lttng.org/view/Code%20quality/job/lttng-ust_master_cppcheck/5/cppcheckResult/source.10/

Proposed-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: sysconf() unchecked return value
Mathieu Desnoyers [Mon, 21 Sep 2015 17:43:08 +0000 (13:43 -0400)] 
Fix: sysconf() unchecked return value

Fix Coverity bug:

CID 1021259 (#1 of 1): Improper use of negative value
(NEGATIVE_RETURNS)5. negative_returns: sysconf(_SC_PAGESIZE) is passed
to a parameter that cannot be negative.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agodoc: add Python example
Philippe Proulx [Sat, 5 Sep 2015 17:47:13 +0000 (13:47 -0400)] 
doc: add Python example

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: Python agent: do not register twice to same port
Philippe Proulx [Sat, 5 Sep 2015 17:38:01 +0000 (13:38 -0400)] 
Fix: Python agent: do not register twice to same port

It is possible that one of the session daemons left its agent.port
file on the file system, for example when killed with SIGKILL. It
is also common that both those session daemons use the same port for
listening to agent connections. In this case, if one session daemon
is running, but two agent.port files exist, the Python agent would
connect its two threads to the same session daemon, leading to
everything done twice: list shows events twice, tracing records
events twice, etc.

This patch ensures that if two agent.port files are found and have
the same content, only one thread is used.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoVersion 2.7.0-rc2 v2.7.0-rc2
Mathieu Desnoyers [Wed, 9 Sep 2015 20:36:43 +0000 (16:36 -0400)] 
Version 2.7.0-rc2

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: close socket on protocol error, sendmsg MSG_NOSIGNAL
Mathieu Desnoyers [Wed, 26 Aug 2015 22:24:11 +0000 (18:24 -0400)] 
Fix: close socket on protocol error, sendmsg MSG_NOSIGNAL

Don't try to keep interacting with sessiond when a protocol error is
detected at the UST application side: this means we cannot trust the
protocol anymore, so there is no reason for keeping the socket open.
For instance, if the application is exiting and we receive a new stream,
we're effectively not reading the stream data, and we return an error.
Unfortunately, the session daemon may try to send us another command,
but we will try interpreting the stream data as a command, which is
invalid.

Also, use MSG_NOSIGNAL flag in the fds recvmsg, so the session daemon
don't get killed with SIGPIPE when it cannot send to the socket due to
connection closed.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoCleanup: more descriptive error message
Mathieu Desnoyers [Tue, 25 Aug 2015 11:12:51 +0000 (07:12 -0400)] 
Cleanup: more descriptive error message

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: add missing ust lock around objd_table_destroy()
Mathieu Desnoyers [Fri, 21 Aug 2015 23:11:56 +0000 (16:11 -0700)] 
Fix: add missing ust lock around objd_table_destroy()

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: application exit race with pthread cancel
Mathieu Desnoyers [Mon, 17 Aug 2015 16:50:34 +0000 (09:50 -0700)] 
Fix: application exit race with pthread cancel

Listener threads can be cancelled with ust lock held, which can hang the
following ust cleanup routine, because tracepoint probe unregister needs
to take the ust lock.

Fix this by disabling pthread cancellation for the entire duration of
the ust lock.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoCleanup: configure layout for python agent detection
Mathieu Desnoyers [Tue, 11 Aug 2015 16:11:57 +0000 (12:11 -0400)] 
Cleanup: configure layout for python agent detection

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoBuild: python agent: use setup.py over autoconf
Jonathan Rajotte [Mon, 10 Aug 2015 18:45:34 +0000 (14:45 -0400)] 
Build: python agent: use setup.py over autoconf

This change provides a valid way of installing the agent. The autoconf
python macro provides the wrong installation path for
python 3 under Debian and Ubuntu due to distro-specific packaging for
python 2.7 and 3.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoBuild: add python interpreter used by python agent if built
Jonathan Rajotte [Mon, 10 Aug 2015 18:45:33 +0000 (14:45 -0400)] 
Build: add python interpreter used by python agent if built

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoDoc: basic lttng ust python agent documentation
Jonathan Rajotte [Mon, 10 Aug 2015 18:45:32 +0000 (14:45 -0400)] 
Doc: basic lttng ust python agent documentation

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoBuild: use AM_PATH_PYTHON to resolve python when building agent
Jonathan Rajotte [Mon, 10 Aug 2015 18:45:31 +0000 (14:45 -0400)] 
Build: use AM_PATH_PYTHON to resolve python when building agent

The agent can be built against a forced python version by exporting
PYTHON environment variable at configure time.

ex:
$ export PYTHON=python3
$ ./configure --enable-python-agent

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoBuild: only check if python exists in path
Jonathan Rajotte [Mon, 10 Aug 2015 18:45:30 +0000 (14:45 -0400)] 
Build: only check if python exists in path

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoDoc: add LTTNG_UST_CLOCK_PLUGIN to man page
Jonathan Rajotte [Thu, 23 Jul 2015 20:02:51 +0000 (16:02 -0400)] 
Doc: add LTTNG_UST_CLOCK_PLUGIN to man page

Also add indications on how to use the plugin with lttng-tools.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoDoc: add LTTNG_UST_GETCPU_PLUGIN to man page
Jonathan Rajotte [Thu, 23 Jul 2015 20:02:50 +0000 (16:02 -0400)] 
Doc: add LTTNG_UST_GETCPU_PLUGIN to man page

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: Java agent: update ref count in enabledLoggers
Philippe Proulx [Mon, 3 Aug 2015 20:40:03 +0000 (16:40 -0400)] 
Fix: Java agent: update ref count in enabledLoggers

Integer objects are immutable in Java, so

    Integer refcount = enabledLoggers.get(name);
    refcount--;

does not update the value in enabledLoggers.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoRename Python agent tracepoint to "event"
Jérémie Galarneau [Thu, 30 Jul 2015 20:43:21 +0000 (16:43 -0400)] 
Rename Python agent tracepoint to "event"

This rename comes as an effort to remain consistent with the tracepoint
naming scheme used by Log4J and JUL.

The associated change in lttng-tools is introduced as of d8c7bda0.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: remove generated file from git tree
Mathieu Desnoyers [Thu, 16 Jul 2015 16:07:27 +0000 (12:07 -0400)] 
Fix: remove generated file from git tree

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoVersion 2.7.0-rc1 v2.7.0-rc1
Mathieu Desnoyers [Wed, 15 Jul 2015 18:42:05 +0000 (14:42 -0400)] 
Version 2.7.0-rc1

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: Use $enableval with AC_ARG_ENABLE
Michael Jeanson [Wed, 8 Jul 2015 18:24:57 +0000 (14:24 -0400)] 
Fix: Use $enableval with AC_ARG_ENABLE

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: Cleanup local_apps sock_info in lttng_ust_cleanup
Jérémie Galarneau [Tue, 7 Jul 2015 18:35:54 +0000 (14:35 -0400)] 
Fix: Cleanup local_apps sock_info in lttng_ust_cleanup

LTTng-UST will deadlock after a fork while waiting on the
"constructor_wait" semaphore if local apps, handled the session daemon
running under the current UID, are disabled or "not_allowed".

This deadlock can be triggered by setting an infinite registration
timeout, clearing the HOME environment variable and launching an app
which calls FORK(3). This will cause setup_local_apps() to fail to
determine the local_apps sock_path, thus leaving
local_apps.allowed == 0.

This, in turn, would cause lttng_ust_cleanup to skip the cleanup
of the local_apps sock_info after a fork,
leaving local_apps.constructor_sem_posted == 1. This would cause
handle_register_done() in the child to skip over the decrementation
of sem_count and post of the constructor_wait semaphore.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: handle sys_futex EINTR and EWOULDBLOCK
Mathieu Desnoyers [Mon, 6 Jul 2015 21:09:32 +0000 (17:09 -0400)] 
Fix: handle sys_futex EINTR and EWOULDBLOCK

Handling sys_futex EINTR allows us to retry waiting on the futex
immediately if we are interrupted by a signal without having to try
connecting to the session daemon.

This should not impact correctness though, as the wait scheme would
simply try to connect, fail, and try waiting again.

Also handle errors on FUTEX_WAKE.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: update liburcu URL
Mathieu Desnoyers [Thu, 2 Jul 2015 21:11:22 +0000 (17:11 -0400)] 
Fix: update liburcu URL

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years ago.gitignore: ignore Python agent generated files
Philippe Proulx [Tue, 30 Jun 2015 23:45:10 +0000 (19:45 -0400)] 
.gitignore: ignore Python agent generated files

Reported-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
9 years agoAdd ctf_sequence_hex() macro
Philippe Proulx [Tue, 30 Jun 2015 23:39:36 +0000 (19:39 -0400)] 
Add ctf_sequence_hex() macro

This patch adds the `_elem_type_base` parameter to
the internal _ctf_sequence_encoded() macro to
specify the sequence's element type's base.

ctf_sequence_hex() sets the `_elem_type_base`
parameter to 16.

This is convenient for recording byte buffers and
viewing them in hexadecimal.

Suggested-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
9 years agoFix: set soinfo_data's vdso flag correctly in base address statedump
Antoine Busque [Tue, 30 Jun 2015 21:59:01 +0000 (17:59 -0400)] 
Fix: set soinfo_data's vdso flag correctly in base address statedump

The vdso flag is set to 0 when the executable can be found on disk.

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: running java examples out of tree
Michael Jeanson [Tue, 30 Jun 2015 21:32:56 +0000 (17:32 -0400)] 
Fix: running java examples out of tree

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: java class check when uudecode is not present
Michael Jeanson [Tue, 30 Jun 2015 20:59:54 +0000 (16:59 -0400)] 
Fix: java class check when uudecode is not present

On systems where 'uudecode' is present, the java class check will
run a precompiled class file in the local directory. If the CLASSPATH
variable doesn't contain "." the test will fail regardless of the
presence of the tested for class on the classpath.

This fix makes the behavior of the test consistant whether 'uudecode'
is present or not.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoCleanup: remove extra whitespace in configure output
Mathieu Desnoyers [Tue, 30 Jun 2015 17:04:27 +0000 (13:04 -0400)] 
Cleanup: remove extra whitespace in configure output

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoDefault to no unaligned access on unsupported archs
Michael Jeanson [Tue, 30 Jun 2015 15:55:40 +0000 (11:55 -0400)] 
Default to no unaligned access on unsupported archs

[ Edit by Mathieu: change configure output style to match current style. ]

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agocleanup: Coding style fixes to the Java agent
Alexandre Montplaisir [Mon, 29 Jun 2015 20:55:00 +0000 (16:55 -0400)] 
cleanup: Coding style fixes to the Java agent

- Use camelCase for regular members and FULL_CAPS for static final
  ones (except for API classes).
- All members of an interface are public static final by default,
  no need to repeat the modifiers.
- Marked final some fields that could be.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
9 years agocleanup: Mark obsolete JUL agent as @Deprecated
Alexandre Montplaisir [Mon, 29 Jun 2015 20:32:22 +0000 (16:32 -0400)] 
cleanup: Mark obsolete JUL agent as @Deprecated

Java has a @Deprecated annotation to indicate deprecated classes
(or methods, members, etc.). This will keep the code available for
backwards compatibility, but will emit a warning to any user calling
it.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
9 years agoFix compilation warnings in the Java agent
Alexandre Montplaisir [Fri, 26 Jun 2015 22:03:31 +0000 (18:03 -0400)] 
Fix compilation warnings in the Java agent

- Remove unused imports.
- Access static fields statically.
- Mark static methods that can be.
- Remove exception declarations that are not actually thrown
  (on non-API methods only).

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
9 years agoFix: out of tree build of java agents
Michael Jeanson [Thu, 25 Jun 2015 23:10:54 +0000 (19:10 -0400)] 
Fix: out of tree build of java agents

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: Use env CLASSPATH when building log4j example
Michael Jeanson [Thu, 25 Jun 2015 23:00:22 +0000 (19:00 -0400)] 
Fix: Use env CLASSPATH when building log4j example

The location of the log4j jar file is specified during configure with
the CLASSPATH envvar, reuse it when building the example.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: build log4j example when enabled
Michael Jeanson [Thu, 25 Jun 2015 21:13:07 +0000 (17:13 -0400)] 
Fix: build log4j example when enabled

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoBump tracer version to 2.7.0-pre
Mathieu Desnoyers [Tue, 23 Jun 2015 17:36:47 +0000 (13:36 -0400)] 
Bump tracer version to 2.7.0-pre

Trace viewers use the tracer minor version to know which event name to
expect for the statedump. Since we changed the namespacing of those
events for 2.7, switch the tracer minor version to "7" before rc1, hence
the use of "pre" at this stage of the release process.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: perform volatile load of tracepoint state
Mathieu Desnoyers [Mon, 22 Jun 2015 14:30:02 +0000 (10:30 -0400)] 
Fix: perform volatile load of tracepoint state

Because tracepoint state is updated by lttng-ust threads, and read by
application threads, we need to perform a volatile load of that state.

Not having the volatile load can cause the compiler to optimize away the
reload of that state, keeping a local copy instead. For instance, a main
program consisting of a loop could keep the tracepoint state on its
stack or in registers without ever reloading it from memory.

Perform a volatile load (CMM_LOAD_SHARED()) of the tracepoint state.
Add the matching volatile store (CMM_STORE_SHARED()) in tracepoint.c for
the state update.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoAdd demo-tracelog to gitignore file
Mathieu Desnoyers [Thu, 18 Jun 2015 18:42:56 +0000 (14:42 -0400)] 
Add demo-tracelog to gitignore file

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoAdd aarch64 support to configure
Michael Jeanson [Thu, 18 Jun 2015 14:41:55 +0000 (10:41 -0400)] 
Add aarch64 support to configure

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoImplement cpu_id context for filtering
Mathieu Desnoyers [Sat, 13 Jun 2015 09:27:07 +0000 (11:27 +0200)] 
Implement cpu_id context for filtering

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoust cyg-profile: use same class for entry and exit
Mathieu Desnoyers [Wed, 10 Jun 2015 11:32:30 +0000 (13:32 +0200)] 
ust cyg-profile: use same class for entry and exit

Share same serialization functions for entry and exit events.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: function instrumentation ip context
Mathieu Desnoyers [Wed, 10 Jun 2015 11:27:18 +0000 (13:27 +0200)] 
Fix: function instrumentation ip context

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: liblttng-ust-dl ip context
Mathieu Desnoyers [Wed, 10 Jun 2015 11:20:31 +0000 (13:20 +0200)] 
Fix: liblttng-ust-dl ip context

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoRemove caller field from malloc events
Mathieu Desnoyers [Wed, 10 Jun 2015 11:17:33 +0000 (13:17 +0200)] 
Remove caller field from malloc events

This duplicates info now available in the "ip" context.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: pthread wrapper ip context
Mathieu Desnoyers [Wed, 10 Jun 2015 11:15:28 +0000 (13:15 +0200)] 
Fix: pthread wrapper ip context

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: lttng-ust-malloc ip context
Mathieu Desnoyers [Wed, 10 Jun 2015 11:15:09 +0000 (13:15 +0200)] 
Fix: lttng-ust-malloc ip context

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoAllow TP_IP_PARAM arg name to be configured
Mathieu Desnoyers [Wed, 10 Jun 2015 11:14:08 +0000 (13:14 +0200)] 
Allow TP_IP_PARAM arg name to be configured

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agotracelog: use same class for all loglevels
Mathieu Desnoyers [Wed, 10 Jun 2015 06:54:37 +0000 (08:54 +0200)] 
tracelog: use same class for all loglevels

Each loglevel can be serialized by the exact same serialization
function. Therefore, use a single tracepoint class for all those.

This diminishes the code size of the probe, and therefore its impact on
the instruction cache.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agofix tracelog namespacing of loglevels
Mathieu Desnoyers [Tue, 9 Jun 2015 14:38:21 +0000 (16:38 +0200)] 
fix tracelog namespacing of loglevels

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoAdd tracelog documentation to lttng-ust(3)
Mathieu Desnoyers [Tue, 9 Jun 2015 14:21:00 +0000 (16:21 +0200)] 
Add tracelog documentation to lttng-ust(3)

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoImplement demo-tracelog example
Mathieu Desnoyers [Tue, 9 Jun 2015 13:55:07 +0000 (15:55 +0200)] 
Implement demo-tracelog example

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoImplement tracelog API
Mathieu Desnoyers [Tue, 9 Jun 2015 11:56:47 +0000 (13:56 +0200)] 
Implement tracelog API

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: fetch caller address from tracef()
Mathieu Desnoyers [Tue, 9 Jun 2015 09:51:06 +0000 (11:51 +0200)] 
Fix: fetch caller address from tracef()

Don't fetch the address within the ust trampoline, but rather the caller
address.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoRename helper providers and events for consistency
Antoine Busque [Mon, 25 May 2015 23:17:09 +0000 (19:17 -0400)] 
Rename helper providers and events for consistency

This patch renders uniform the provider names of UST helpers by making
them all start with the "lttng_ust_" prefix. Also, the helper formerly
known as "ust_baddr" is now "lttng_ust_dl", and its "push" and "pop"
events are now "dlopen" and "dlclose", respectively. This is in line
with the other helpers, for which the name of the provider reflects
the name of the library, and the names of events correspond to those
of the traced functions.

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoRefactor state dump system
Antoine Busque [Mon, 25 May 2015 23:12:30 +0000 (19:12 -0400)] 
Refactor state dump system

This patch refactors the state dump system. The state dump provider is
now "lttng_ust_statedump". Each process' state dump is now delimited
by a pair of "start" and "end" events. These events mark the beginning
and end of the state dump, which happens once per traced application
per session. Note that for a given (process, session) pair, begin/end
events are serialized and will match. However, in a session, state
dumps from different processes may be interleaved. The vpid context
should be used to identify which events belong to which process.

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoRefactor Python agent
Philippe Proulx [Wed, 1 Apr 2015 00:09:54 +0000 (20:09 -0400)] 
Refactor Python agent

This patch refactors the whole LTTng-UST Python agent.
Notorious changes are:

  * Python module "lttng_agent" moved to Python package
    "lttngust". This removes "agent" from the name, which
    really is an implementation detail. "lttngust" is used
    because "lttng" would clash with LTTng-tools Python
    bindings.
  * Python package instead of simple module. Splitting the
    code in various modules will make future development
    easier.
  * Use daemon threads to make sure logging with tracing
    support is available as long as the regular threads live,
    while making sure that the application exits instantly when
    its regular threads die.
  * Create client threads and register to session daemons
    at import time. This allows the package to be usable just
    by importing it (no need to instanciate any specific class
    or call any specific function).
  * Do not use a semaphore + sleep to synchronize client threads
    with the importing thread: use a blocking synchronized
    queue with appropriate timeouts.
  * Add debug statements at strategic locations, enabled by
    setting the $LTTNG_UST_PYTHON_DEBUG environment variable
    to 1 before importing the package.
  * Override the default session daemon registration timeout
    with $LTTNG_UST_PYTHON_REGISTER_TIMEOUT (ms).
  * Override the default session daemon registration retry
    delay with $LTTNG_UST_PYTHON_REGISTER_RETRY_DELAY (ms).
  * Honor $LTTNG_HOME (to retrieve session daemon TCP ports).
  * Do not use an absolute path when loading the tracepoint
    provider shared object. Users should use the
    $LD_LIBRARY_PATH environment variable to override the
    default library path when running Python instead.
  * Do not keep an event dictionary since this brings issues
    when enabling/disabling events with the same name in
    different sessions.
  * Make sure the reference count does not go below 0,
    which could happen when destroying a session which contains
    events that are disabled already.
  * Minor improvements to make the code more Pythonic.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: building probe providers with C++ compiler
Mathieu Desnoyers [Thu, 7 May 2015 17:25:04 +0000 (13:25 -0400)] 
Fix: building probe providers with C++ compiler

Robert Daniels wrote:
> > I'm attempting to use lttng userspace tracing with a C++ application
> > on an ARM platform. I'm using GCC 4.8.4 on Linux 3.14 with the 2.6
> > release of lttng. I've compiled lttng-modules, lttng-ust, and
> > lttng-tools and have been able to get a simple test working with C
> > code.  When I attempt to run the hello.cxx test on my target it will
> > segfault.
>
>
> I spent a little time digging into this issue and finally discovered the
> cause of my segfault with ARM C++ tracepoints.
>
> There is a struct called 'lttng_event' in ust-events.h which contains an
> empty union 'u'.  This was the cause of my issue.  Under C, this empty union
> compiles to a zero byte member while under C++ it compiles to a one byte
> member, and in my case was four-byte aligned which caused my C++ code to
> have the 'cds_list_head node' offset incorrectly by four bytes.  This lead
> to an incorrect linked list structure which caused my issue.
>
> Since this union is empty, I simply removed it from the struct and everything
> worked correctly.
>
> I don't know the history or purpose behind this empty union so I'd like to
> know if this is a safe fix.  If it is I can submit a patch with the union
> removed.

That's a very nice catch!

We do not support building tracepoint probe provider with
g++ yet, as stated in lttng-ust(3):

"- Note for C++ support: although an application instrumented with
   tracepoints can be compiled with g++, tracepoint probes should be
   compiled with gcc (only tested with gcc so far)."

However, if it works fine with this fix, then I'm tempted to take it,
especially because removing the empty union does not appear to affect
the layout of struct lttng_event as seen from liblttng-ust, which must
be compiled with a C compiler,  and from probe providers compiled with
a C compiler. So all we are changing is the layout of a probe provider
compiled with a C++ compiler, which is anyway buggy at the moment,
because it is not compatible with the layout expected by liblttng-ust
compiled with a C compiler.

Reported-by: Robert Daniels <robert.daniels@vantagecontrols.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: use lttng_secure_getenv to handle env. vars. involving paths
Mathieu Desnoyers [Thu, 23 Apr 2015 22:45:05 +0000 (18:45 -0400)] 
Fix: use lttng_secure_getenv to handle env. vars. involving paths

This is a security fix for applications linked against liblttng-ust
which are exposed as setuid binaries.

A malicious user which can run those applications could target those
environment variable paths to locations that would allow it to create
files in various areas of the filesystem.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: Don't wait during registration if clock_gettime() fails
Jérémie Galarneau [Thu, 23 Apr 2015 17:07:38 +0000 (13:07 -0400)] 
Fix: Don't wait during registration if clock_gettime() fails

get_constructor_timeout() currently returns -1 which, according to
the lttng-ust(3) man page and lttng_ust_init() implementation,
"waits forever".

This changes the behavior to match what is expressed in the comments.

Comments in get_constructor_timeout() and get_timeout() are also
modified to match the following convention:

-1: wait forever
0: don't wait
1: wait for "constructor_delay_ms"

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: getcpu/clock plugin handle leak
Mathieu Desnoyers [Tue, 14 Apr 2015 22:13:19 +0000 (18:13 -0400)] 
Fix: getcpu/clock plugin handle leak

Keep the handle to the shared object in a static variable. Use it to
check whether it has already been initialized.

We don't allow dlclose() for now though, so it technically leaks, but at
least we keep a reference to the handle.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: add missing new ldl dependency for liblttng-ust-ctl
Mathieu Desnoyers [Tue, 14 Apr 2015 18:07:36 +0000 (14:07 -0400)] 
Fix: add missing new ldl dependency for liblttng-ust-ctl

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: add missing getenv wrapper
Mathieu Desnoyers [Fri, 10 Apr 2015 22:46:27 +0000 (18:46 -0400)] 
Fix: add missing getenv wrapper

Required for old glibc.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: add missing lttng-clock.c
Mathieu Desnoyers [Fri, 10 Apr 2015 22:31:28 +0000 (18:31 -0400)] 
Fix: add missing lttng-clock.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: add missing ust-clock.h
Mathieu Desnoyers [Fri, 10 Apr 2015 22:24:04 +0000 (18:24 -0400)] 
Fix: add missing ust-clock.h

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoclock plugin example: use shift and mul
Mathieu Desnoyers [Sun, 12 Oct 2014 11:27:24 +0000 (13:27 +0200)] 
clock plugin example: use shift and mul

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoImplement getcpu override
Mathieu Desnoyers [Thu, 2 Oct 2014 21:03:35 +0000 (17:03 -0400)] 
Implement getcpu override

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoImplement clock override plugin support
Mathieu Desnoyers [Wed, 1 Oct 2014 21:59:01 +0000 (17:59 -0400)] 
Implement clock override plugin support

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoAdd tracepoint_enabled() macro
Dmitri Shubin [Fri, 27 Mar 2015 19:34:11 +0000 (15:34 -0400)] 
Add tracepoint_enabled() macro

Allows application to check if given probe is enabled.
It's useful when data it passes to tracepoint is expensive to compute.

Signed-off-by: Dmitri Shubin <dmitri.shubin@orc-group.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoMove file creation/unlink from liblttng-ust-ctl to consumerd
Mathieu Desnoyers [Tue, 16 Dec 2014 01:24:22 +0000 (20:24 -0500)] 
Move file creation/unlink from liblttng-ust-ctl to consumerd

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoImplement file-backed ring buffer
Mathieu Desnoyers [Tue, 8 Jul 2014 14:11:09 +0000 (10:11 -0400)] 
Implement file-backed ring buffer

Allow using the --shm-path option in LTTng to specify the location of
the files backing the UST ring buffer. Useful for trace extraction upon
crash, especially by using a persistent memory filesystem as storage for
the files.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: oot build: missing top_builddir include
Jonathan Rajotte [Mon, 23 Mar 2015 19:37:57 +0000 (15:37 -0400)] 
Fix: oot build: missing top_builddir include

lttng/tracepoint.h need lttng/ust-config.h which is
generated on build. When in oot build mode ust_config.h is located in
$(top_builddir)/include/. Only $(top_srcdir)/include/ was defined as
includes source.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: Mismatching code and console output in log4j example
Jérémie Galarneau [Mon, 23 Feb 2015 21:22:53 +0000 (16:22 -0500)] 
Fix: Mismatching code and console output in log4j example

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoUpdate manpage about LTTNG_UST_DEBUG effect
Mathieu Desnoyers [Wed, 4 Feb 2015 22:41:32 +0000 (17:41 -0500)] 
Update manpage about LTTNG_UST_DEBUG effect

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoDon't output to stderr from lib unless DEBUG is activated
Mathieu Desnoyers [Wed, 4 Feb 2015 22:39:01 +0000 (17:39 -0500)] 
Don't output to stderr from lib unless DEBUG is activated

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoRemove usterr.h, use usterr-signal-safe.h everywhere instead
Mathieu Desnoyers [Wed, 4 Feb 2015 22:33:59 +0000 (17:33 -0500)] 
Remove usterr.h, use usterr-signal-safe.h everywhere instead

Remove minimally used code.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: out-of-tree build: wrong file path for sed input
Jonathan Rajotte [Mon, 26 Jan 2015 16:50:31 +0000 (11:50 -0500)] 
Fix: out-of-tree build: wrong file path for sed input

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: make dist: python agent file handling
Jonathan Rajotte [Mon, 26 Jan 2015 16:50:30 +0000 (11:50 -0500)] 
Fix: make dist: python agent file handling

Fresh make dist attempt to package a build time file:lttng_agent.py and
make dist attempt to package a non-existent file.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: java-agent: out-of-tree path to java manifest
Jonathan Rajotte [Fri, 23 Jan 2015 18:22:11 +0000 (13:22 -0500)] 
Fix: java-agent: out-of-tree path to java manifest

This should also be backported to stable-2.6.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoAdd return address to liblttng-ust-libc-wrapper
Olivier Delbeke [Mon, 19 Jan 2015 19:14:16 +0000 (14:14 -0500)] 
Add return address to liblttng-ust-libc-wrapper

Signed-off-by: Olivier Delbeke <olivier.delbeke@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: missing parenthesis in offset_align_floor
Mathieu Desnoyers [Fri, 16 Jan 2015 16:33:00 +0000 (11:33 -0500)] 
Fix: missing parenthesis in offset_align_floor

Is currently unused. Triggers a compile error when used.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: add ustctl_has_perf_counters
Mathieu Desnoyers [Mon, 12 Jan 2015 22:11:32 +0000 (17:11 -0500)] 
Fix: add ustctl_has_perf_counters

Allow sessiond to report whether performance counters are supported by
UST on the architecture as soon as the user try to enable a perf counter
context.

Fixes #851

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: add urcu-bp TLS fixup
Mathieu Desnoyers [Mon, 12 Jan 2015 18:27:53 +0000 (13:27 -0500)] 
Fix: add urcu-bp TLS fixup

When performing a library base address statedump, the UST threads can
grab the RCU read-side lock, which touch a TLS. We should "pre-fault"
this TLS in the constructor to eliminate a deadlock involving libc
dynamic loader lock.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: add missing poll.h include
Mathieu Desnoyers [Mon, 12 Jan 2015 16:09:18 +0000 (11:09 -0500)] 
Fix: add missing poll.h include

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: get_subbuf: bound number of consumerd retry
Mathieu Desnoyers [Mon, 5 Jan 2015 02:06:19 +0000 (21:06 -0500)] 
Fix: get_subbuf: bound number of consumerd retry

When an application traced with per-UID buffers vanishes between its
reserve and commit ring buffer operations (e.g. segfault), it may cause
the consumer daemon to enter an endless loop, awaiting for the
application to complete its commit.

Fix this situation by bounding the number of retry using an adaptative
approach: try actively for a few times, and then try a few more times
with a 10ms delay between attempts.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: man: you can't link a lib with a static lib
Philippe Proulx [Wed, 26 Nov 2014 21:50:56 +0000 (16:50 -0500)] 
Fix: man: you can't link a lib with a static lib

Fixes: #825
Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: context alignment not properly handled
Mathieu Desnoyers [Mon, 1 Dec 2014 23:18:13 +0000 (18:18 -0500)] 
Fix: context alignment not properly handled

This issue affects only architectures without efficient unaligned
accesses, only when a context field with larger alignment follows a
context field with smaller alignment. It generates unreadable traces
when such context fields are enabled in this configuration.

Fixes #867

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: Shorthand option -cp not supported in all version of Java
Christian Babeux [Fri, 28 Nov 2014 21:39:50 +0000 (16:39 -0500)] 
Fix: Shorthand option -cp not supported in all version of Java

Signed-off-by: Christian Babeux <christian.babeux@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoFix: allow tracepoints to build with --std=c99
Mathieu Desnoyers [Mon, 17 Nov 2014 16:36:10 +0000 (17:36 +0100)] 
Fix: allow tracepoints to build with --std=c99

std=c99 without #define __USE_BSD does not work for tracepoint header,
due to missing endianness macros. Force their definition in the
ust-endian.h wrapper if they are missing.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
9 years agoBump UST ABI for new release cycle
Mathieu Desnoyers [Thu, 13 Nov 2014 22:04:41 +0000 (17:04 -0500)] 
Bump UST ABI for new release cycle

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 years agoCleanup: remove "disabled" flag for new release cycle
Mathieu Desnoyers [Wed, 12 Nov 2014 23:12:35 +0000 (18:12 -0500)] 
Cleanup: remove "disabled" flag for new release cycle

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 years agoFix: filter attach vs event enable race
Mathieu Desnoyers [Wed, 12 Nov 2014 23:08:04 +0000 (18:08 -0500)] 
Fix: filter attach vs event enable race

In order to correctly handle the use-case where events are enabled
_after_ trace is started, and _after_ applications are already being
traced, the event should be created in a "disabled" state, so that it
does not trace events until its filter is attached.

This fix needs to be done both in lttng-tools and lttng-ust. In order to
keep ABI compatibility between tools and ust within a stable release
cycle, we introduce a new "disabled" within struct lttng_ust_event
padding (previously zeroed). Newer LTTng-UST checks this flag, and
fallback on the old racy behavior (enabling the event on creation) if it
is unset.

Therefore, old session daemon works with newer lttng-ust of the same
stable release, and vice-versa. However, building lttng-tools requires
an upgraded lttng-ust, which contains the communication protocol with
the new "disabled" field.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 years agoFix: add a configure check for weak symbols support
Christian Babeux [Wed, 12 Nov 2014 19:35:21 +0000 (14:35 -0500)] 
Fix: add a configure check for weak symbols support

Fixes #236

Signed-off-by: Christian Babeux <christian.babeux@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 years agoFix coverity warning about sizeof(void **) != sizeof(void *)
Mathieu Desnoyers [Wed, 12 Nov 2014 21:05:36 +0000 (16:05 -0500)] 
Fix coverity warning about sizeof(void **) != sizeof(void *)

The size of the copied data is actually void *, not void **.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 years agoFix: off-by-one in sequence filter comparator
Mathieu Desnoyers [Sat, 8 Nov 2014 17:16:41 +0000 (12:16 -0500)] 
Fix: off-by-one in sequence filter comparator

If we pass the following sequence as event input:
- field name "seqfield2"
- seq. len.: 4
- sequence array: "testA" (5 characters),

The following filters do not have the intended effect:
* 'seqfield2=="testA"'
  - expected: no match.
  - actual behavior: match.

* 'seqfield2=="test"'
  - expected: match.
  - actual behavior: no match.

This is caused by an off-by-one in the comparison with sequence length
in the filter bytecode interpreter.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 years agoFix: Java Agent JAR file symlink should be created after objects install
Christian Babeux [Tue, 4 Nov 2014 21:28:19 +0000 (16:28 -0500)] 
Fix: Java Agent JAR file symlink should be created after objects install

Signed-off-by: Christian Babeux <christian.babeux@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
10 years agoFix: Add versioning to liblttng-ust-agent JAR
Christian Babeux [Mon, 3 Nov 2014 20:12:26 +0000 (15:12 -0500)] 
Fix: Add versioning to liblttng-ust-agent JAR

The liblttng-ust-agent JAR need versioning. The manifest file contains the
appropriate information about the JAR, such as the current version.

A symlink is also created and installed in order to point to the latest
version of the JAR.

e.g: liblttng-ust-agent.jar -> liblttng-ust-agent-1.0.0.jar

Signed-off-by: Christian Babeux <christian.babeux@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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