Fix tracepoint.h multiple .o within module/core exec linkage bug

We need all symbols looked up with dlopen to share the same linkage
property as the __tracepoint_registered variable (shared across .o in a
module/executable), otherwise only the first .o which runs its
constructor will have those defined.

Caused some tracepoints not to be traced in non-_LGPL_SOURCE
applications, due to the check:

if (!TP_RCU_LINK_TEST())   \
    return;

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

tracepoint: name -> _name to fix possible namespace clash

We use "name" as parameter in the macro.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add debug printout to tracepoint.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Rename liblttng-ust-libc to liblttng-ust-libc-wrapper

What a beautiful piece of code we can find in python:

/usr/lib/python2.6/ctypes/util.py:

    def _findLib_gcc(name):
        expr = r'[^\(\)\s]*lib%s\.[^\(\)\s]*' % re.escape(name)

Basically, this match any library having "libc.so" in its name. It
should be reported to python developers as a bug, but let's not be the
first to trigger the issue in the wild.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update hardcoded loglevel

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add "easy_ust" example

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update gitignore

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Zero-initialize struct msghdr

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add environment information

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix event-specific enabling

Bug introduced with loglevel as attributes implementation.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update static lib linking

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

liblttng-ust-libc: fix linking

Reported-by: Samuel Martin <smartin@aldebaran-robotics.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

liblttng-ust-libc: fix lib dependency

liblttng-ust-libc.so depends on liblttng-ust.so but does not link
against it.

z$ ../linux32-cross-i686-aldebaran-linux-gnu/bin/i686-aldebaran-linux-gnu-nm -CD output/target/usr/lib/liblttng-ust-libc.so | grep -E 'U ltt'
         U ltt_probe_register
         U ltt_probe_unregister
z$ ../linux32-cross-i686-aldebaran-linux-gnu/bin/i686-aldebaran-linux-gnu-ldd --root output/target/ output/target/usr/lib/liblttng-ust-libc.so
        liburcu-bp.so.1 => /usr/lib/liburcu-bp.so.1 (0xdeadbeef)
        libpthread.so.0 => /lib/libpthread.so.0 (0xdeadbeef)
        libc.so.6 => /lib/libc.so.6 (0xdeadbeef)
        ld-linux.so.2 => /lib/ld-linux.so.2 (0xdeadbeef)
        liburcu-common.so.1 => /usr/lib/liburcu-common.so.1 (0xdeadbeef)
        libuuid.so.1 => /lib/libuuid.so.1 (0xdeadbeef)
        libdl.so.2 => /lib/libdl.so.2 (0xdeadbeef)
z$ ../linux32-cross-i686-aldebaran-linux-gnu/bin/i686-aldebaran-linux-gnu-nm -CD output/target/usr/lib/liblttng-ust.so | grep ltt_probe_
0000a5cc T ltt_probe_register
0000a7d6 T ltt_probe_unregister
z$

Signed-off-by: Samuel Martin <smartin@aldebaran-robotics.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Install README and ChangeLog into system doc

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add hello-static-lib test

Test case where provider is located in a static library.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix static provider linking: introduce TRACEPOINT_PROBE_DYNAMIC_LINKAGE

We need to emit an unresolved symbol in the case where the provider is
put into a statically linked library, otherwise the linker removes the
provider object.

See README for details.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix 32-bit type: allocated len is used

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix 32-bit type mismatch

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add 1.9.5 Changelog

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update LTTng-UST version to 1.9.5

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

UST comm ABI: Add padding, push version to 2.0

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update loglevel names

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Implement loglevels as event and wildcard attributes

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update loglevel ABI: only loglevel value/enum is known by UST

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Pre-assign fixed loglevels

Some early LTTng-UST adopters brought to my attention that the way
tracepoint loglevels are currently specified in LTTng-UST might be too
relax for its own good. If each application define their own loglevel
names/values, it will become difficult to use the loglevels to select
"trace verbosity" in a system-wide manner.

Now that I come to think of it, it might make sense to pre-define a set
of supported loglevels, similarly to syslog(3). However, given that
tracing sometimes targets debug levels that are more fine-grained than
in the case of logs, I would propose to split the "debug" loglevel into
sub-categories.

My current thought is to simply just allow these loglevels. I doubt that
letting application developers specify extra loglevels on top of this
would be that useful, and it would certainly be more confusing.

In the list below, lower numbers means "low verbosity", higher numbers
means "high verbosity, debug-style information".

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove old (now unused) loglevel control code entirely

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update loglevel selection ABI

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Use boot_id as monotonic clock uuid

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

clock: add clock description to metadata

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Properly fix the timekeeping overflow detection

The underlying issue was a mismatch between the ring buffer
configuration description of the number of clock bits (32) saved and the
actual number used (27).

Introduce LTTNG_COMPACT_EVENT_BITS and LTTNG_COMPACT_TSC_BITS across the
code to remove all hardcoded instances of these values to ensure this
kind of mistake does not happen again.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reported-by: Sébastien Barthélémy <barthelemy@crans.org>

Revert "Fix timestamps for slow-paced event rates"

This reverts commit 9080554ff25b08f48762d2ee7cfa3981317e9c1d.

Was assuming LTTng 0.x clock scheme. LTTng 2.0 does not require a timer.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Revert "Force 64-bit timestamps"

This reverts commit aae88c703374f4b1fbb8a5e7e95591bf8ce3e837.

This commit was assuming the LTTng 0.x clock management scheme, and does
not apply to LTTng 2.0, which does not require a timer.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Declare struct lttng_ust_calibrate

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Force 64-bit timestamps

commit 9080554ff25b08f48762d2ee7cfa3981317e9c1d attempted to fix the
timestamp problem by using large event headers. It incorrectly stated
that those headers "use a 64-bit timestamp field". In fact, they use a
32-bit timestamp field (not 64). So they were helping (it was better
than using a 27-bit field), but the problem could still appear. It's
only when the RING_BUFFER_RFLAG_FULL_TSC is set that the ring buffer
forces use of the 64-bit fields.

Fix this for good by setting this flag.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

demo program: ensure we don't link demo on useless libs

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

ust comm: Receive second FD even if 1st receive failed

Ensures proper protocol behavior, because the sender expects the
receiver to get the two file descriptors.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

ust consumer: close shm fd after mapping it

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add a comment about which wait fd is closed early by UST.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove leftover structure in ust-abi.h

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Close stream and channel file descriptors as soon as passed to sessiond

Ensure we don't bust the open FD limit with many sessions.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix AC_LANG_SOURCE usage: only takes one parameter

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix timestamps for slow-paced event rates

Given that we currently do not implement any timer that provides
guarantees of 27-bit timestamps overflow detection, force the timestamp
to 64-bit.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

configure.ac: Use AC_LANG_SOURCE for if else macros

Ref. http://www.flameeyes.eu/autotools-mythbuster/forwardporting/autoconf.html
"Noteworthy changes in autoconf version 2.66 through 2.68"

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add execution instructions to the demo test program.

Signed-off-by: Yannick Brosseau <yannick.brosseau@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Force the building of shared noinst libraries in the demo test program

Remove the need to install them in /tmp

Signed-off-by: Yannick Brosseau <yannick.brosseau@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Only print the futex perror in debug mode

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update version to 1.9.4

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Split liblttng-ust into liblttng-ust and liblttng-ust-tracepoint libs

So tracepoint.h (in applications) can just dlopen
liblttng-ust-tracepoint without having to load the full liblttng-ust.

Now liblttng-ust is only needed by tracepoint probes.

This is a first step to fix the deadlock between the dynamic linker
mutex and ust mutex occurring when liblttng-ust is dlopened (due to lazy
symbol resolving of Thread-Local Storage (TLS)).

Discourage dlopen of liblttng-ust (and of tracepoint probes) in the
README.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Comment the union field (only used in call_rcu scheme)

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update version to 1.9.3

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix clock source overflow on 32-bit archs

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove unused trace_clock_frequency

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

check for negative wait() return value

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add DBG message when registering a probe

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Only show futex warning "perror" in debug mode

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update version to 1.9.2

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add missing ust_libc.h to Makefile.am

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Use DBG instead of WARN for futex_wake workaround message

This message will only be shown if LTTNG_UST_DEBUG env. var. is set.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Make dlopen more robust by using the .0 target for the library

We've experienced a double library load on a setup where the lttng-ust
.so and .so.0 were two physical files instead of a symlink (as they
should be). So let's make liblttng-ust slightly more robust by
specifying the target .so.0 instead of .so. It will also make handling
of library version upgrades easier.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update changelog

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update README

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update version to 1.9.1

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Rename liblttng-ust-malloc to liblttng-ust-libc, update to lttng-ust 2.0

- includes a fix to tracepoints to disable the tracepoint sites upon
  unregistration of the library. This is useful for cases where, like
  the libc wrapper, the library dependency for constructor/destructor
  is not quite right due to cross-dependencies (lttng-ust depends on
  malloc/free). This ensures the session teardown will never be in a
  position where it could teardown data structures still in use
  by probes that cannot be unregistered because their associated
  library would already have called its destructor.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update readme file, add example makefile

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add missing compat.h file in Makefile.am

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove deprecated documentation files

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove unused variable warning

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix unset metadata buffer self ref

Caused the metadata flush to never be done.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

add ustctl_release_handle

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Print compiler warning/runtime warning and truncate too long tracepoint names

- also apply to loglevel names.
- -Wsystem-headers needs to be used to get gcc to show the
  warnings from system headers (which is the category in which the
  tracepoint event declaration headers falls into).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add sock flush buffer ctl API

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add LTTNG_HOME_RUNDIR constant for local tracing

Adds the LTTNG_HOME_RUNDIR constant using ".lttng" as local directory
used for local sockets (when the session daemon is not running under
root privileges).

This is part of a change made to lttng-tools in order to support
unprivileged users to use the UST tracer.

Signed-off-by: David Goulet <david.goulet@polymtl.ca>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix dynamic linking with GNU gold linker

Programs that were not linked explicitely with -lurcu-bp generated no
trace output when linked with GNU gold, because the urcu-bp library
symbols were not used to populate the weak urcu-bp symbols used by the
program. (even though they worked fine with the standard GNU ld).

Solve this by creating those wrapper symbols into tracepoint.c, and
explicitely get them with dlsym() in the constructor.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

wildcards & loglevels: fix list field for iteration

Was causing segmentation fault on loglevel & wildcard disable operation.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Handle _LGPL_SOURCE config

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add wildcard support

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix loglevel value enable: use isdigit rather than isalpha

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix uninitialized match variable

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Support activation of loglevel by number

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

loglevel enable fix: enable event names, not loglevel

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix add_loglevel entry setup

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

loglevel enable fixes

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

loglevels: deal with fixup upon library load

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add loglevel enable/disable support

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Include lttng/tracepoint-types.h from tracepoint.h

Was wrong include path.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix BUG_ON handling

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Cleanup tracepoint.c

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Increase tracepoint provider:name len limit to 255, add compile-time warning

The compiler will now complain with a warning if a tracepoint
provider:name exceeds the 255 char limit (+ \0).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Use iterator on tracepoint probes instead of tracepoints per se

- Simplify iteration locking scheme by using a linked list to store all
  the tracepoints to be iterated on.
- Allow getting the loglevel in addition to the tracepoint name.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Cleanup the JNI interface options in configure.ac

Fix typos, use macros and skip a redundant check.

Signed-off-by: Alexandre Montplaisir <alexandre.montplaisir@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add check for 'texinfo' to configure.ac

Fix for http://lttng.org/issue/252

Signed-off-by: Alexandre Montplaisir <alexandre.montplaisir@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update .gitignore

Signed-off-by: Alexandre Montplaisir <alexandre.montplaisir@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove unused import for java tracing wrapper

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add missing .class in ust java makefile

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update tracepoint used within lttng ust java

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

lttng_ust_java: add missing .h

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update lttng-ust java provider following API change

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add TRACEPOINT_DEFINE to ust java lib

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Describe autotools/libtool/automake version dependency

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove m4_ifdef for AC_PROG_LIBTOOL (deprecated)

This trick does not seem to work anyway.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>