lttng-ust.git
8 years agodoc: Add flags for JUL and python agent compiling
Geneviève Bastien [Wed, 6 Jul 2016 15:36:35 +0000 (11:36 -0400)] 
doc: Add flags for JUL and python agent compiling

The compilation flag documentation is added to the README.md and
configure.ac files for easier access to them.

Signed-off-by: Geneviève Bastien <gbastien+lttng@versatic.net>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agotests/hello.cxx: add ctf_enum_auto() entries
Philippe Proulx [Mon, 4 Jul 2016 21:47:30 +0000 (17:47 -0400)] 
tests/hello.cxx: add ctf_enum_auto() entries

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd ctf_enum_auto() for autoincrementing enumeration values
Philippe Proulx [Mon, 4 Jul 2016 21:04:42 +0000 (17:04 -0400)] 
Add ctf_enum_auto() for autoincrementing enumeration values

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd missing ust_lib.c and ust_lib.h
Mathieu Desnoyers [Tue, 5 Jul 2016 20:09:32 +0000 (16:09 -0400)] 
Add missing ust_lib.c and ust_lib.h

The new lib load/unload events are implemented in those two files.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agodl instrumentation: add dlmopen event, trace dlopen flags
Mathieu Desnoyers [Mon, 4 Jul 2016 21:06:04 +0000 (17:06 -0400)] 
dl instrumentation: add dlmopen event, trace dlopen flags

Add missing dlmopen(3) instrumentation, and add the "flags" field to
dlopen instrumentation.

Link: http://man7.org/linux/man-pages/man3/dlopen.3.html
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd library load/unload tracking events
Mathieu Desnoyers [Mon, 4 Jul 2016 19:39:01 +0000 (15:39 -0400)] 
Add library load/unload tracking events

Track library load and unload, with the following new events:

lttng_ust_lib:load
lttng_ust_lib:build_id
lttng_ust_lib:debug_link
lttng_ust_lib:unload

This takes care of correctly tracing the mapping of direct dependencies
of dlopen'd libraries, which was not appropriately done by tracing just
dlopen events.

Fixes: #1035
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoCommunication protocol: use fixed-size integer rather than enum
Mathieu Desnoyers [Tue, 5 Jul 2016 17:10:11 +0000 (13:10 -0400)] 
Communication protocol: use fixed-size integer rather than enum

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd ustctl command to regenerate the statedump
Julien Desfossez [Thu, 30 Jun 2016 15:43:50 +0000 (11:43 -0400)] 
Add ustctl command to regenerate the statedump

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoImplement statedump command in UST
Mathieu Desnoyers [Thu, 14 Apr 2016 19:13:05 +0000 (15:13 -0400)] 
Implement statedump command in UST

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agotests/hello.cxx: add enumeration field
Philippe Proulx [Tue, 28 Jun 2016 23:40:36 +0000 (19:40 -0400)] 
tests/hello.cxx: add enumeration field

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: ctf_enum_value() does not work with g++
Philippe Proulx [Tue, 28 Jun 2016 23:11:04 +0000 (19:11 -0400)] 
Fix: ctf_enum_value() does not work with g++

g++ does not support non-trivial designated initializers like
C99 does, thus the fields must be initialized in order
in ctf_enum_value().

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: lttng context perf: missing stdbool.h header include
Mathieu Desnoyers [Tue, 28 Jun 2016 03:06:25 +0000 (23:06 -0400)] 
Fix: lttng context perf: missing stdbool.h header include

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd perf context support for ARMv7
Julien Desfossez [Mon, 27 Jun 2016 21:40:01 +0000 (17:40 -0400)] 
Add perf context support for ARMv7

Allow to add perf context to UST traces. ARMv7 does not have a reliable
way to read perf PMU counters entirely from user-space like we do on
x86, so this approach requires a system call every time a counter needs
to be read which has a significant performance impact.

ARMv7 does not have way to read PMU from userspace because it requires
write access to the debug coprocessor to select which PMU counter to
read which defeats user-space/kernel protection. For that reason, the
bits required to allow user-space access to those registers are not
enabled in the kernel and Perf does not expose any information in the
shared mmap page, so we do not know what is the counter index. Also, for
ARMv7 we cannot set the exclude_kernel flag, so the counter stays active
even when the process is executing in kernel context (system calls
mainly).

This generic approach might work on other architecture, but it has not
yet been tested so it is not enabled in the code.

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoKeep perf context FD open for other architectures
Julien Desfossez [Mon, 27 Jun 2016 21:40:00 +0000 (17:40 -0400)] 
Keep perf context FD open for other architectures

Instead of closing the perf context after the page has been mapped, keep
it open so it can be used with the read() system call if the
architecture does not support direct access from user-space.

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoDoc: cmake example: fix coding style
Mathieu Desnoyers [Mon, 27 Jun 2016 16:38:35 +0000 (12:38 -0400)] 
Doc: cmake example: fix coding style

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoDoc: ship cmake example with 'make distcheck'
Sebastien Boisvert [Fri, 17 Jun 2016 03:32:05 +0000 (23:32 -0400)] 
Doc: ship cmake example with 'make distcheck'

The file Makefile.am in the examples directory was modified. The
modifications were done to include the new cmake example. The new cmake
example is built when make is invoke in the root directory. Further,
this new example also ships in the tarball when the latter is created
("make distcheck").

Acked-by: Philippe Proulx <eeppeliteloop@gmail.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Sebastien Boisvert <sboisvert@gydle.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoDoc: add CMake example
Sebastien Boisvert [Thu, 16 Jun 2016 15:41:11 +0000 (11:41 -0400)] 
Doc: add CMake example

In doc/examples/cmake-multiple-shared-libraries/, a new example lives.
This example requires a C++ compiler (HAVE_CXX) and it requires also a
cmake executable (HAVE_CMAKE). This example relies on the cmake module
called FindLTTngUST, which was kindly provided by Philippe Proulx.

The alignment of a small amount of lines was improved in the FindLTTngUST
module.

This new example generates a shared library (tracepoint provider) that
links with dl and with lttng-ust. Two other shared libraries are also
generated, and these two are linked with the tracepoint provider shared
library.

Link: https://lists.lttng.org/pipermail/lttng-dev/2016-June/026213.html
Link: https://lists.lttng.org/pipermail/lttng-dev/2016-June/026203.html
Link: https://www.pastery.net/fvanfh/raw/
Acked-by: Philippe Proulx <eeppeliteloop@gmail.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Sebastien Boisvert <sboisvert@gydle.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoconfigure.ac: check cmake availability
Sebastien Boisvert [Tue, 21 Jun 2016 01:11:00 +0000 (21:11 -0400)] 
configure.ac: check cmake availability

In the configure.ac file, detect if a cmake executable is
available. Two new variables are now available in any
Makefile.am file: HAVE_CXX (which tells if a C++ compiler
is available) and HAVE_CMAKE (which indicates whether a cmake
executable is available).

Acked-by: Philippe Proulx <eeppeliteloop@gmail.com>
Acked-by: Sebastien Boisvert <sboisvert@gydle.com>
Signed-off-by: Sebastien Boisvert <sboisvert@gydle.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoOnly build python lib when agent is enabled
Michael Jeanson [Thu, 16 Jun 2016 15:33:51 +0000 (11:33 -0400)] 
Only build python lib when agent is enabled

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agodoc: information has no plural
Michael Jeanson [Thu, 16 Jun 2016 15:33:34 +0000 (11:33 -0400)] 
doc: information has no plural

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: allow non-LGPL modules to use tracepoints
Mathieu Desnoyers [Wed, 15 Jun 2016 20:34:09 +0000 (16:34 -0400)] 
Fix: allow non-LGPL modules to use tracepoints

Non-LGPL modules that use tracepoint instrumentation, but have no
compile unit defining either TRACEPOINT_DEFINE or
TRACEPOINT_CREATE_PROBES fail to build due to undefined reference to
`tracepoint_dlopen_ptr'.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd -ust to the name of UST threads of the application
Raphaël Beamonte [Sun, 5 Jun 2016 22:00:10 +0000 (18:00 -0400)] 
Add -ust to the name of UST threads of the application

Add the required functions to change the thread name of the UST
threads and add the -ust string at its end. This will help to
identify LTTng-UST processes when analyzing the trace of a process.

Signed-off-by: Raphaël Beamonte <raphael.beamonte@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoComment the locking mechanisms in ContextInfoManager
Alexandre Montplaisir [Thu, 2 Jun 2016 09:26:54 +0000 (05:26 -0400)] 
Comment the locking mechanisms in ContextInfoManager

Coverity didn't like our non-locking of the get() method. The
lock is actually only needed for the registration/unregistration
of retrievers, the get() can access the ConcurrentHashMap
directly.

Add a few comments to help explain this.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: Null-check return value of log4j.Category.getAllAppenders()
Alexandre Montplaisir [Thu, 2 Jun 2016 09:22:13 +0000 (05:22 -0400)] 
Fix: Null-check return value of log4j.Category.getAllAppenders()

Coverity points out this can be null, null-check it to be safe.

If it in indeed null, we must still continue on to verify the
parent loggers.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd liblttng-ust-agent.jar to the .gitignore
Alexandre Montplaisir [Thu, 2 Jun 2016 09:15:47 +0000 (05:15 -0400)] 
Add liblttng-ust-agent.jar to the .gitignore

This is a compatibility symlink that is now installed by
lttng-ust-agent-all.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: Specify encoding when reading agent port file
Alexandre Montplaisir [Thu, 2 Jun 2016 09:12:44 +0000 (05:12 -0400)] 
Fix: Specify encoding when reading agent port file

FileReader uses the default platform encoding. InputStreamReader
on the other hand allows supplying an encoding, which is always
safer to do.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: Include child loggers in the output of "lttng list"
Alexandre Montplaisir [Thu, 2 Jun 2016 07:29:48 +0000 (03:29 -0400)] 
Fix: Include child loggers in the output of "lttng list"

The case where a parent logger has an handler attached but the
tracepoint comes from a child logger is not correctly handled
by the "lttng list -j/-l" command.

For example, if the logger "org.myapp" has a LTTng handler
attached, its child logger "org.myapp.mycomponent" would be
absent from the lttng list output even if it exists.

When checking for events to list, search through the parent
tree of each logger to find a potential LTTng handler.

This should also fix the problem of "lttng list" always
returning empty when the deprecated, but still supported,
LTTngAgent API was used, since that one attaches only one
handler to the root logger.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: Handle both agent config files pointing to same port
Alexandre Montplaisir [Thu, 2 Jun 2016 07:05:31 +0000 (03:05 -0400)] 
Fix: Handle both agent config files pointing to same port

The expected locations for the user and root agent sessiond
configuration files are ~/.lttng/agent.port and
/var/run/lttng/agent.port, respectively. These files indicate
which port an agent should connect to to reach its respective
sessiond.

If by some bad luck both files indicate the same port, then
both Java TCP clients would end up connecting to the same
sessiond, resulting in weird results, like "lttng list" listing
all events twice.

Make sure the target ports are different, and avoid duplicate
connections in case there are not.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoSuppress static method warning
Alexandre Montplaisir [Thu, 2 Jun 2016 03:03:07 +0000 (23:03 -0400)] 
Suppress static method warning

The LTTngAgent#dispose method is static on purpose (see commit
9355f049), and will remain so as long as this agent will be
supported, so we can suppress the compiler warning telling
us the method can be made static.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd more logging to the LttngTcpSessiondClient
Alexandre Montplaisir [Thu, 2 Jun 2016 01:15:31 +0000 (21:15 -0400)] 
Add more logging to the LttngTcpSessiondClient

There can be up to 4 TCP clients running at the same time
(for all combinations of user/root and jul/log4j), the
logging should differentiate between them.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoUse config.h to detect sched_getcpu support
Michael Jeanson [Mon, 30 May 2016 20:31:33 +0000 (16:31 -0400)] 
Use config.h to detect sched_getcpu support

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: use limits.h in ust-elf test
Michael Jeanson [Mon, 30 May 2016 20:31:32 +0000 (16:31 -0400)] 
Fix: use limits.h in ust-elf test

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: strerror_r behavior is glibc specific
Michael Jeanson [Mon, 30 May 2016 20:31:31 +0000 (16:31 -0400)] 
Fix: strerror_r behavior is glibc specific

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd support for musl libc to ust-dlfcn.h
Michael Jeanson [Mon, 30 May 2016 20:31:30 +0000 (16:31 -0400)] 
Add support for musl libc to ust-dlfcn.h

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: don't generate 0-len array in tracepoint probes
Mathieu Desnoyers [Mon, 30 May 2016 16:47:50 +0000 (18:47 +0200)] 
Fix: don't generate 0-len array in tracepoint probes

It is forbidden by C99, and gcc/g++ in pedantic mode generates errors
for e.g. field-less events.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: log4j example: set logger level to prevent unexpected level inheritance
Jonathan Rajotte [Thu, 26 May 2016 22:05:12 +0000 (18:05 -0400)] 
Fix: log4j example: set logger level to prevent unexpected level inheritance

BSF or other jars can ship with log4j.properties file embedded. This
causes problem when launching application with a general class path (e.g
/usr/share/java/*) since log4j will look for a property file in all
loaded jars. If any contains directive for the root logger it will
affect any logger with no level who are directly under the root logger.
This could result in an unexpected behaviour (e.g no events triggered
etc.).

Link: https://issues.apache.org/jira/browse/BSF-24
Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: no LGPL define for malloc and pthread wrappers
Mathieu Desnoyers [Wed, 25 May 2016 23:39:15 +0000 (19:39 -0400)] 
Fix: no LGPL define for malloc and pthread wrappers

Do _not_ define _LGPL_SOURCE because we don't want to create a circular
dependency loop between this malloc wrapper, liburcu and libc.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: all lttng-ust source files should be tagged _LGPL_SOURCE
Mathieu Desnoyers [Wed, 25 May 2016 21:15:21 +0000 (17:15 -0400)] 
Fix: all lttng-ust source files should be tagged _LGPL_SOURCE

Defining tracepoint call sites and probes as _LGPL_SOURCE allows
inlining RCU code into lttng-ust, which improves performance.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: initialize RCU callbacks with mixed LGPL/non-LGPL objects
Mathieu Desnoyers [Wed, 25 May 2016 21:19:35 +0000 (17:19 -0400)] 
Fix: initialize RCU callbacks with mixed LGPL/non-LGPL objects

Linking both _LGPL_SOURCE and non-_LGPL_SOURCE objects into the same
module may result in having the RCU callbacks left to NULL, which
prevents tracing for tracepoints and/or probes which sit in the non-LGPL
compile unit.

This happens if the contructor of the LGPL compile unit is executed
first, thus incrementing the __tracepoint_registered counter, which will
prevent later execution of that same constructor in the non-LGPL compile
unit to initialize the RCU callbacks in __tracepoint__init_urcu_sym().

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: incorrect structure layout with mixed LGPL/non-LGPL objects
Mathieu Desnoyers [Wed, 25 May 2016 21:17:41 +0000 (17:17 -0400)] 
Fix: incorrect structure layout with mixed LGPL/non-LGPL objects

Linking both _LGPL_SOURCE and non-_LGPL_SOURCE objects into the same
module may result in corruption. If the tracepoint_dlopen object used is
the one declared by a LGPL compile unit, a non-LGPL compile unit may try
to initialize fields beyond the end of the structure.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: don't call __builtin_return_address(0) on 32-bit powerpc
Mathieu Desnoyers [Tue, 24 May 2016 22:58:14 +0000 (18:58 -0400)] 
Fix: don't call __builtin_return_address(0) on 32-bit powerpc

Invoking __builtin_return_address(0) corrupts the stack, as previously
noticed for the "ip" context. Disable its use on 32-bit powerpc
everywhere else in the lttng-ust code base.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoUpdate version name TBD
Mathieu Desnoyers [Tue, 24 May 2016 20:14:25 +0000 (16:14 -0400)] 
Update version name TBD

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoUpdate version to 2.9.0-pre
Michael Jeanson [Tue, 24 May 2016 20:05:02 +0000 (16:05 -0400)] 
Update version to 2.9.0-pre

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: tracepoint header: declare tracepoint_dlopen_ptr
Mathieu Desnoyers [Mon, 23 May 2016 16:06:33 +0000 (12:06 -0400)] 
Fix: tracepoint header: declare tracepoint_dlopen_ptr

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: update debug message about weak-hidden symbols
Mathieu Desnoyers [Mon, 23 May 2016 15:37:07 +0000 (11:37 -0400)] 
Fix: update debug message about weak-hidden symbols

We actually deal OK with compilers that treats weak-hidden symbols as
different addresses between compile units part of the same module.
Simply report this without statement on whether or not the compiler
producing this code is broken.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: tracepoint-rcu header: use tracepoint_dlopen_ptr
Mathieu Desnoyers [Mon, 23 May 2016 15:05:21 +0000 (11:05 -0400)] 
Fix: tracepoint-rcu header: use tracepoint_dlopen_ptr

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: test: relax requirement on weak-hidden symbol address
Mathieu Desnoyers [Mon, 23 May 2016 01:29:58 +0000 (21:29 -0400)] 
Fix: test: relax requirement on weak-hidden symbol address

Now that tracepoint.h works around gcc issues by adding a pointer
indirection, we can relax the requirement on weak-hidden symbol
addresses.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: work-around gcc optimisation oddness on 32-bit powerpc
Mathieu Desnoyers [Mon, 23 May 2016 00:07:48 +0000 (20:07 -0400)] 
Fix: work-around gcc optimisation oddness on 32-bit powerpc

Deal with gcc O1 optimisation issues with weak hidden symbols. gcc 4.8
and prior does not have the same behavior for symbol scoping on 32-bit
powerpc depending on the object size: symbols for objects of 8 bytes or
less have the same address throughout a module, whereas they have
different addresses between compile units for objects larger than 8
bytes. Add this pointer indirection to ensure that the symbol scoping
match that of the other weak hidden symbols found in tracepoint.h.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: test weak-hidden symbols
Mathieu Desnoyers [Sun, 22 May 2016 15:26:00 +0000 (11:26 -0400)] 
Fix: test weak-hidden symbols

On many architectures (arm32, arm64, powerpc64) gcc chooses to assign
different addresses to weak-hidden symbols from different compile units
within the same module.

This is unfortunate, but still OK with respect to tracepoints.

The real issue is on 32-bit powerpc, where gcc (in O1 or more) assigns
different addresses only for objects larger than 8 bytes, but same
addresses for objects of 8 bytes or less (int and pointers).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoPrint DBG() message about compiler weak hidden symbol behavior
Mathieu Desnoyers [Fri, 20 May 2016 19:23:06 +0000 (15:23 -0400)] 
Print DBG() message about compiler weak hidden symbol behavior

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agotest: add test for gcc issue with weak hidden symbol on powerpc
Mathieu Desnoyers [Fri, 20 May 2016 17:02:47 +0000 (13:02 -0400)] 
test: add test for gcc issue with weak hidden symbol on powerpc

On Ubuntu 32-bit powerpc, gcc 4.4, 4.6, 4.8, gcc -O1 (and O2) causes
weak hidden symbols to have different addresses within the same module.
It seems to be fixed in gcc 4.9 on powerpc.

This issue causes some tracepoints to be silently hidden from LTTng.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoRestrict Java context retriever names to a set of valid characters
Alexandre Montplaisir [Thu, 19 May 2016 21:55:02 +0000 (17:55 -0400)] 
Restrict Java context retriever names to a set of valid characters

Since the context/retriever names end up as-is as part of the
metadata, only alphanumerical characters, periods "." and
underscores "_" should be accepted. The names must also not
start with a number.

Refuse registration of retriever names that do not respect these
conditions, so that the problem is reported right away to the
application.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: Correctly compute Java agent list loggers response size
Alexandre Montplaisir [Thu, 19 May 2016 19:59:50 +0000 (15:59 -0400)] 
Fix: Correctly compute Java agent list loggers response size

The code was assuming that (number of characters == number of bytes),
which is not always the case!

The notions of number of bytes and data sizes only make sense when
the strings are encoded into byte arrays. The response's getBytes()
method should the only one handling these concepts.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd support for aarch64_be
Mathieu Desnoyers [Thu, 19 May 2016 20:10:26 +0000 (16:10 -0400)] 
Add support for aarch64_be

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: Fix synchronization of LTTngAgent#dispose
Alexandre Montplaisir [Thu, 19 May 2016 19:10:04 +0000 (15:10 -0400)] 
Fix: Fix synchronization of LTTngAgent#dispose

Commit 9355f049 changed the dispose() back to non-static. However,
"static synchronized" and "synchronized" are not the same thing!
The latter synchronizes on the instance, but the former synchronizes
on the class object.

In this case we need to synchronize on the class object manually.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: Verify number of bytes contained in sessiond agent commands
Alexandre Montplaisir [Thu, 19 May 2016 18:54:59 +0000 (14:54 -0400)] 
Fix: Verify number of bytes contained in sessiond agent commands

The command header indicates the number of bytes in the payload.
Make sure those bytes were really present on the socket, and throw
an error if they were not.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: Avoid potential null dereference with log4j loggers
Alexandre Montplaisir [Thu, 19 May 2016 18:49:06 +0000 (14:49 -0400)] 
Fix: Avoid potential null dereference with log4j loggers

Coverity warns that the return of LogManager.getCurrentLoggers()
can contain null elements. Add an explicit null check to skip those.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoSpecify UTF-8 encoding for all Java agent commands
Alexandre Montplaisir [Thu, 19 May 2016 18:31:20 +0000 (14:31 -0400)] 
Specify UTF-8 encoding for all Java agent commands

Context info was already set to UTF-8, but agent enabled/disabled
and list-loggers commands should also specify the UTF-8 encoding.

Signed-off-by: Alexandre Montplaisir <alexmonthy@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: merge tap tests stdout and stderr
Michael Jeanson [Wed, 18 May 2016 19:18:05 +0000 (15:18 -0400)] 
Fix: merge tap tests stdout and stderr

This makes the output and error statement ordered in the log
file and ensure that the first line is the tap test plan. Some tap
parser are confused if the test plan is not on the first line.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoDocumentation: ring buffer: SWITCH_FLUSH can be used when active
Mathieu Desnoyers [Wed, 18 May 2016 14:06:45 +0000 (10:06 -0400)] 
Documentation: ring buffer: SWITCH_FLUSH can be used when active

Snapshot mode tracing may use SWITCH_FLUSH while tracing is active.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: unchecked return value in trace_clock_read64_monotonic
Mathieu Desnoyers [Tue, 17 May 2016 16:05:10 +0000 (12:05 -0400)] 
Fix: unchecked return value in trace_clock_read64_monotonic

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: portability: no arith on void pointer
Mathieu Desnoyers [Mon, 16 May 2016 19:07:05 +0000 (15:07 -0400)] 
Fix: portability: no arith on void pointer

Reported by cppcheck.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: initialize build id and debug link flags to 0
Mathieu Desnoyers [Mon, 16 May 2016 18:00:16 +0000 (14:00 -0400)] 
Fix: initialize build id and debug link flags to 0

When trace_baddr is called for [vdso], those fields are used without
being initialized.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoTests: Add tap-driver.sh for automake < 1.12
Michael Jeanson [Mon, 16 May 2016 15:18:31 +0000 (11:18 -0400)] 
Tests: Add tap-driver.sh for automake < 1.12

Add the tap-driver.sh script in the aux directory to enable
systems with an automake version prior to 1.12 to bootstrap
the source tree from git.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: add "has_build_id" and "has_debug_link" fields to debuginfo events
Mathieu Desnoyers [Mon, 16 May 2016 14:40:32 +0000 (10:40 -0400)] 
Fix: add "has_build_id" and "has_debug_link" fields to debuginfo events

This allows trace analyzers to know whether they should expect the build
id or debug link events following the bin_info event.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoTests: Replace prove by autotools tap runner
Michael Jeanson [Thu, 12 May 2016 15:01:18 +0000 (11:01 -0400)] 
Tests: Replace prove by autotools tap runner

This patch removes the dependency on the prove perl script
to run the TAP test suite. It replaces it with the autotools
shell TAP driver that only requires a shell and awk.

Custom arguments can be passed to the test runner with
env variables as follow:

  env LOG_DRIVER_FLAGS='--comments --ignore-exit' \
      TESTS='foo.test baz.test' make -e check

This tap driver also creates a log file for each test that
can then be used by another system to build a test report.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agobootstrap: Standardize on autoreconf -vi
Mathieu Desnoyers [Thu, 12 May 2016 15:55:19 +0000 (11:55 -0400)] 
bootstrap: Standardize on autoreconf -vi

Don't overwrite already generated files.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoHarmonize bootstrap script across projects
Michael Jeanson [Thu, 12 May 2016 15:01:19 +0000 (11:01 -0400)] 
Harmonize bootstrap script across projects

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agolttng-ust(3): order environment variables
Philippe Proulx [Wed, 11 May 2016 15:56:09 +0000 (11:56 -0400)] 
lttng-ust(3): order environment variables

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agolttng-ust(3): fix syntax of env. variables section
Philippe Proulx [Wed, 11 May 2016 15:54:48 +0000 (11:54 -0400)] 
lttng-ust(3): fix syntax of env. variables section

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agolttng-ust(3): document $LTTNG_HOME
Philippe Proulx [Wed, 11 May 2016 15:49:48 +0000 (11:49 -0400)] 
lttng-ust(3): document $LTTNG_HOME

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: Java agent should use LTTNG_HOME
Mathieu Desnoyers [Wed, 11 May 2016 00:33:00 +0000 (20:33 -0400)] 
Fix: Java agent should use LTTNG_HOME

Both in UST C/C++ support and Python agent, LTTNG_HOME can be used to
override HOME for lttng-ust. Ensure the Java agent has the same
behavior.

Fixes: #881
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: examples make distcheck failure
Mathieu Desnoyers [Tue, 10 May 2016 22:10:43 +0000 (18:10 -0400)] 
Fix: examples make distcheck failure

"make distcheck" marks each source file on the srcdir in the extracted
dist tarball read-only. The examples copy from the srcdir into the
builddir before running the "make" examples, but this keeps the
read-only flag on the builddir directories, which fails the build
because the resulting objects cannot be created.

Fix this by ensuring the copied target directory for each example is
user-writeable.

Fixes: #903
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoCleanup: add static for internal symbols
Mathieu Desnoyers [Tue, 10 May 2016 18:49:14 +0000 (14:49 -0400)] 
Cleanup: add static for internal symbols

Those underscore-prefixed symbols are only used internally within the
tracepoint provider. Declare them as static symbols, thus removing
unneeded global symbols which are not meant to be used by applications.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoCleanup: Remove unused max() macros from ring_buffer_frontend.c
Mathieu Desnoyers [Tue, 10 May 2016 02:36:00 +0000 (22:36 -0400)] 
Cleanup: Remove unused max() macros from ring_buffer_frontend.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoUse min_t/max_t macros in lttng-ust-elf.c
Mathieu Desnoyers [Tue, 10 May 2016 02:34:25 +0000 (22:34 -0400)] 
Use min_t/max_t macros in lttng-ust-elf.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoTests: update ust-elf tests to reflect correct memsz computation
Antoine Busque [Mon, 9 May 2016 22:09:37 +0000 (18:09 -0400)] 
Tests: update ust-elf tests to reflect correct memsz computation

Signed-off-by: Antoine Busque <abusque@efficios.com>
8 years agoFix: erroneous computation of ELF in-memory size
Antoine Busque [Mon, 9 May 2016 21:54:44 +0000 (17:54 -0400)] 
Fix: erroneous computation of ELF in-memory size

The current algorithm for computation of ELF in-memory size computed
values using the `p_align` field from program headers to align loaded
segments, when in fact `p_align` is only used to describe the
relationship between a segment's offset in the ELF file and its
virtual address once loaded in memory (`p_vaddr`), not the alignment
between segments. (Refer to the ELF specification version 1.1 at pages
2-2 and 2-8 for more details.)

This implementation instead uses the `p_memsz` and `p_vaddr` fields to
compute the highest virtual address of the executable, and uses the
difference from its base address as the in-memory size.

Signed-off-by: Antoine Busque <abusque@efficios.com>
8 years agoMake code and man pages share the same default values
Philippe Proulx [Wed, 4 May 2016 20:59:41 +0000 (16:59 -0400)] 
Make code and man pages share the same default values

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: remove NULL check of nonnull parameter in dlclose
Antoine Busque [Mon, 9 May 2016 20:33:29 +0000 (16:33 -0400)] 
Fix: remove NULL check of nonnull parameter in dlclose

The `handle` parameter of `dlclose`, as defined in
`include/lttng/ust-dlfcn.h` is marked `__nonnull`. GCC starting with
version 6.1 emits warnings for comparisons of nonnull arguments
against NULL by default (see -Wnonnull-compare).

Therefore, this removes a superfluous NULL check on `handle`, for
which GCC emitted a warning.

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoTracepoint array/sequence: add nowrite hex macros
Mathieu Desnoyers [Fri, 6 May 2016 20:30:21 +0000 (16:30 -0400)] 
Tracepoint array/sequence: add nowrite hex macros

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoTracepoint: add ctf array for network byte order integers
Mathieu Desnoyers [Fri, 6 May 2016 20:09:57 +0000 (16:09 -0400)] 
Tracepoint: add ctf array for network byte order integers

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoTracepoint: add ctf sequence for network byte order integers
Mathieu Desnoyers [Fri, 6 May 2016 18:32:45 +0000 (14:32 -0400)] 
Tracepoint: add ctf sequence for network byte order integers

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: endianness of integers received by filter
Mathieu Desnoyers [Tue, 26 Apr 2016 22:39:38 +0000 (18:39 -0400)] 
Fix: endianness of integers received by filter

We need to byteswap integers passed to the filter when they are tagged
as being in an endianness which differs from the architecture
endianness, so the integer comparisons make sense in terms of value
rather than raw bytes for those fields.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoDoc: Update README.md
Michael Jeanson [Mon, 25 Apr 2016 19:08:08 +0000 (15:08 -0400)] 
Doc: Update README.md

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: jul and log4j agents makefile missing line and indentation
Michael Jeanson [Mon, 25 Apr 2016 18:46:20 +0000 (14:46 -0400)] 
Fix: jul and log4j agents makefile missing line and indentation

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: re-introduce exported symbols
Mathieu Desnoyers [Mon, 25 Apr 2016 17:12:51 +0000 (13:12 -0400)] 
Fix: re-introduce exported symbols

Keep those exported symbols for backward shared object compatibility.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoDoc: update manpages for soinfo/sopath name change
Antoine Busque [Wed, 20 Apr 2016 21:05:09 +0000 (17:05 -0400)] 
Doc: update manpages for soinfo/sopath name change

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoRename statedump and dl events and fields
Antoine Busque [Wed, 20 Apr 2016 17:09:07 +0000 (13:09 -0400)] 
Rename statedump and dl events and fields

The current names of the `lttng_ust_statedump:soinfo` event, as well
as its field `sopath` both refer exclusively to shared objects (so),
although the event applies to any executables, including
position-independent executables (PIE), as well as shared objects.

Thus, this patch changes the name of the event to `bin_info` and the
field to `path`, to avoid any confusion.

For consistency, the `sopath` field in the `lttng_ust_dl:dlopen` event
is also renamed to `path`, although dlopen only applies to shared
objects.

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoTests: list ust-elf test data explicitly in EXTRA_DIST
Antoine Busque [Fri, 15 Apr 2016 21:37:43 +0000 (17:37 -0400)] 
Tests: list ust-elf test data explicitly in EXTRA_DIST

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoTests: add tests for lttng_ust_elf_is_pic
Antoine Busque [Fri, 15 Apr 2016 17:18:04 +0000 (13:18 -0400)] 
Tests: add tests for lttng_ust_elf_is_pic

This adds tests for the lttng_ust_elf_is_pic function used to tell
whether an executable is position independent code or not. Three
sample executables are used, one non-PIC executable, one PIE, and a
PIC shared object.

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoAdd is_pic field to statedump soinfo event
Antoine Busque [Wed, 13 Apr 2016 21:31:57 +0000 (17:31 -0400)] 
Add is_pic field to statedump soinfo event

This field indicates whether the executable or library is position
independent code (PIC). The field is not added to the similar dlopen
event from liblttng-ust-dl because in that case all dlopened libraries
are necessarily PIC.

This allows a posteriori analyses to be performed without having to
read the executable file to know whether adresses are relative to the
base address or absolute.

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: add common jar to lttng-ust-agent-all dependencies
Mathieu Desnoyers [Tue, 12 Apr 2016 02:24:39 +0000 (22:24 -0400)] 
Fix: add common jar to lttng-ust-agent-all dependencies

Ensures that applications still find the LTTngAgent class even if none
of JUL nor log4j agents are present.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: add version to lttng-ust-agent-all jar file
Mathieu Desnoyers [Tue, 12 Apr 2016 02:24:25 +0000 (22:24 -0400)] 
Fix: add version to lttng-ust-agent-all jar file

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: rename liblttng-ust-agent to lttng-ust-agent-all
Mathieu Desnoyers [Tue, 12 Apr 2016 00:32:55 +0000 (20:32 -0400)] 
Fix: rename liblttng-ust-agent to lttng-ust-agent-all

Rename liblttng-ust-agent to lttng-ust-agent-all to respect the new
jar file naming scheme, but keep a symbolic link from liblttng-ust-agent
to lttng-ust-agent-all to keep backwards compatibility.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: re-add liblttng-ust-agent.jar
Mathieu Desnoyers [Mon, 11 Apr 2016 23:53:22 +0000 (19:53 -0400)] 
Fix: re-add liblttng-ust-agent.jar

Re-add a jar file that imports all other LTTng java agents (JUL and
log4j) if they are available on the system.

This provides backwards compatibility with Java applications that have
CLASSPATH defined following UST 2.7 documentation.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agoFix: lttng java agent: dispose is non-static
Mathieu Desnoyers [Mon, 11 Apr 2016 22:57:42 +0000 (18:57 -0400)] 
Fix: lttng java agent: dispose is non-static

The UST 2.7 java agent LTTngAgent class has a non-static dispose method.
This class is kept in 2.8 for backwards compatibility purposes. Keep
this API unchanged.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agodoc/man: do not use macros in the NAME section
Philippe Proulx [Thu, 7 Apr 2016 07:45:23 +0000 (03:45 -0400)] 
doc/man: do not use macros in the NAME section

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agodoc/man: remove duplicate copyrights section
Philippe Proulx [Thu, 7 Apr 2016 05:52:15 +0000 (01:52 -0400)] 
doc/man: remove duplicate copyrights section

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
8 years agodoc/man: lttng-ust(3): add tracing control to example
Philippe Proulx [Thu, 7 Apr 2016 01:29:22 +0000 (21:29 -0400)] 
doc/man: lttng-ust(3): add tracing control to example

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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