Cleanup: fix typo

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

Fix: ust-comm recvmsg should handle partial receive

Handles cases where unix socket buffer is full. Without this fix, the
session daemon kicks out application that happen to have their
registration message split into multiple recvmsg on the sessiond side.

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

gcc warning fix: -Wextra

For the "ordered comparison of pointer with integer zero" warning, fix
this by comparing (type) -1 against (type) 0 instead of just 0, so if
"type" is a pointer type, this pointer type will be applied to the right
operand too, thus fixing the warning.

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

Add usage reference count for tracepoints

Keep track of how many libraries use a tracepoint, and disable the
tracepoint when the number of users drops to zero.

A new reference counter is added to tracepoint_entry. This keeps track
of how many callsites use that tracepoint.

When you have libraries and/or executables sharing tracepoints, you
cannot just disable your tracepoints when the library is unregistered.
You must check that the tracepoint is not used by any other libraries
before you disable it.

Function lib_disable_tracepoints becomes unnecessary, and is removed.

Signed-off-by: Ikaheimonen, JP <jp_ikaheimonen@mentor.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

tracepoint.c: Move add_callsite/remove_callsite further down in file

In preparation for calling disable_tracepoint() from those functions.

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

Store the callsites into the library callsite list

Fix the issue where the callsites are registered but never
properly unregistered.

[ Edit by Mathieu Desnoyers: minor coding style fix: remove parenthesis. ]

Signed-off-by: Ikaheimonen, JP <jp_ikaheimonen@mentor.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix linking warning

lttng_static_ctx should be extern in this header to avoid getting a
warning when --warn-common is used.

PS: Thanks to Yannick Brosseau for his help.

Signed-off-by: Mohamad Gebai <mohamad.gebai@polymtl.ca>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Per-stream ioctl to get the current timestamp

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

LTTng ringbuffer ABI calls for index generation

These new calls export the data required for the consumer to
generate the index while tracing :
- timestamp begin
- timestamp end
- events discarded
- context size
- packet size
- stream id

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Specialize lttng_ust_lib_ring_buffer_client_cb

Prepare the ring-buffer config to have custom callbacks. These custom
callbacks are not related to the ring-buffer operations but allow
applications to add custom functions.
No additional feature or change in behaviour in this patch.

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add tracing instrumentation for pthread mutex lock functions

Signed-off-by: Stefan Seefeld <stefan_seefeld@mentor.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Version 2.3.0

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

Version 2.3.0-rc2

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

doc/examples/gen-tp: pass automake CPPFLAGS/CFLAGS/LDFLAGS

Fix cross-build.

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

tools/lttng-gen-tp: honor CPPFLAGS and LDFLAGS

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

Fix: doc/examples cross-build

We need to pass automake's CPPFLAGS and LDFLAGS to examples. Add CFLAGS
too for completeness.

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

Fix: liblttng_ust.la should depend on liblttng-ust-tracepoint.la

Changing -llttng-ust-tracepoint to liblttng-ust-tracepoint.la, so it
appears in the build dependencies.

Fixes #325

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

Introduce configure --with-lttng-system-rundir

Allow overriding the path where the system-wide sessiond is expected to
keep its runtime files.

It does _not_ allow multiple instances of system-wide sessiond to run in
parallel though, because the wait shm files still requires having only
one single system-wide sessiond at any given time.

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

examples: tracepoint probes don't need extern C

Fix all UST demo applications under doc/examples/

Fixes #597

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

Tracepoint probes don't need extern C

tracepoint.h has the proper extern C guards, so every liblttng-ust API
called from the probe has the proper linkage.

The rest of the symbols are only meaningful within the probe, so we
don't care if they are mangled or not.

This fixes the two examples, and lttng-gen-tp.

Fixes #597

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

Add trace support for memalign and posix_memalign

Signed-off-by: Stefan Seefeld <stefan_seefeld@mentor.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

malloc instrumentation: remove dependency on pthread

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

Add trace support for calloc and realloc.

Signed-off-by: Stefan Seefeld <stefan_seefeld@mentor.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: allow make check to run in VPATH build

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

Update .gitignore

Signed-off-by: Zifei Tong <soariez@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Update obsolete benchmark test

Update the test to use lttng-ust 2.x API and output result to TAP
format.

[ Update by Mathieu Desnoyers: README is EXTRA_DIST within Makefile.am ]

Signed-off-by: Zifei Tong <soariez@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Cleanup tests (2nd commit)

Move TAP related code to tests/utils.
Remove scripts only used by obsolete tests.

[ Mathieu : my previous commit was missing some files. ]

Signed-off-by: Zifei Tong <soariez@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Cleanup tests

Move TAP related code to tests/utils.
Remove scripts only used by obsolete tests.

Signed-off-by: Zifei Tong <soariez@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: doc/examples VPATH build

Fixes #577

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

Version 2.3.0-rc1

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

Fix: Unchecked asprintf/vasprintf return values

strp·may·be·modified·even·in·case·of·failure·according·to·the
ASPRINTF(3) man page.

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

Missing NULL pointer init in tap.c

Could lead to free() of unitialized pointer.

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

Disable doc/examples build

This breaks VPATH build.

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

Add python3 support to lttng-gen-tp

Fixes #585

Tested-by: Christian Babeux <christian.babeux@efficios.com>
Signed-off-by: Zifei Tong <soariez@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Bump ABI major to 5

Bump major version between UST-sessiond-consumerd.

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

callsite: add "ip" context

Add caller's instruction pointer context.

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

Allow environment variable LTTNG_HOME to override HOME

Patch functionality - If LTTNG_HOME environment variable exists, it is
used instead of HOME.  Reason for patch - We are trying to deploy LTTng
on a system where $HOME is on a filesystem mounted read-only, but cannot
afford to run lttng as a different user and cannot move the home
directories of users to writeable locations.

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

Fix: libs order in Makefile

Since commit 16c96fc0224145192f803fecbdb20ec05fdaf5e2, the examples
don't build well on Ubuntu. The gcc -l argument needs to be the last
one.

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

Fix: ring buffer: get_subbuf() checks should be performed on "consumed" parameter

This triggers lots of false-positive -EAGAIN errors in flight recorder
snapshots.

Reported-by: Julien Desfossez <jdesfossez@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Introduce ustctl_write_one_packet_to_channel

This function allows the consumer to write at most one packet of data to
the channel, that way we can push data to the ring buffer without
risking to block on subbuffer switch.

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

build: Fix out-of-tree build

To allow out-of-tree build, we need to include top_buildir in include
directories or the generated config header won't be found.

Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: SWITCH_FLUSH new sub-buffer checks

The SWITCH_FLUSH, when performed on a completely empty sub-buffer, was
missing some checks (imported from space reservation).

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

Fix: ring buffer: handle concurrent update in nested buffer wrap around check

With stress-test loads that trigger sub-buffer switch very frequently
(small 4kB sub-buffers, frequent flush) in lttng-modules, we currently
observe this kind of warnings once every few minutes:

[65335.896208] ring buffer relay-overwrite-mmap, cpu 5: records were lost. Caused by:
[65335.896208]   [ 0 buffer full, 1 nest buffer wrap-around, 0 event too big ]

It appears that the check for nested buffer wrap-around does not take
into account that a concurrent execution contexts (either nested for
per-cpu buffers, or from another CPU or nested for global buffers) can
update the commit_count value concurrently.

What we really want to do with this check is to ensure that if we enter
a sub-buffer that had an unbalanced reserve/commit count, assuming there
is no hope that this gets rebalanced promptly, we detect this and drop
the current event. However, in the case where the commit counter has
been concurrently updated by another reserve or a switch, we want to
retry the entire reserve operation.

One way to detect this is to sample the reserve offset twice, around the
commit counter read, along with the appropriate memory barriers.
Therefore, we can detect if the mismatch between reserve and commit
counter is actually caused by a concurrent update, which necessarily has
updated the reserve counter.

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

Cleanup: lib_ring_buffer_switch_new_end() only calls subbuffer_set_data_size()

lib_ring_buffer_switch_new_end() is always called when an event exactly
fills a sub-buffer, which makes padding_size always 0. However, there is
one side-effect that lib_ring_buffer_switch_new_end() needs to have: it
calls subbuffer_set_data_size() to update the size of the data to be
read from the sub-buffer.

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

Fix: doc/examples: gen-tp path

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

Revert "Cleanup: ring buffer: remove lib_ring_buffer_switch_new_end()"

This reverts commit 019fbcb65ec7eec2c86019ad1afce8fa47dc1269.

Breaks regression tests of lttng-tools.

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

Fix: handle writes of length 0

lib_ring_buffer_write() could be passed a length of 0. This typically
has no side-effect as far as writing into the buffers is concerned,
except for one detail: in overwrite mode, there is a check to make sure
the sub-buffer can be written into. This check is performed even if
length is 0. In the case where this would fall exactly at the end of a
sub-buffer, the check would fail, because the offset would fall exactly
at the beginning of the next sub-buffer.

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

Cleanup: ring buffer: remove lib_ring_buffer_switch_new_end()

lib_ring_buffer_switch_new_end() is a leftover from the days where an
event that would exactly fill the current sub-buffer would automatically
trigger a sub-buffer switch into the next sub-buffer.

Even before the ring buffer code has been moved into lttng-modules, this
behavior had been changed: an event that exactly fills a sub-buffer only
fills this current sub-buffer, and does not need to switch into the
next one to populate the sub-buffer header. This change had been done so
periodical timer switch, which shares the same semantic as an event
exactly filling a sub-buffer, would not create tons of empty
sub-buffers.

However, when doing this change, lib_ring_buffer_switch_new_end() has
not been removed, but clearly should have been. Its job is now performed
by the event "commit".

lib_ring_buffer_switch_new_end() has no effect, since padding_size is
always 0.

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

Fix: lttng-events VPATH build

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

Allow #include in template (.tp) file

The #include directive won't be parsed, but will be copied to the
generated .h files.

Also add a verbose (-v) mode to display some debugging output

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

tests/hello.cxx: rename tp.cpp into tp-cpp.cpp

Takes care of autotools issue caused by renaming tp.c to tp.cpp. make
distclean was required when switching between old and newer versions.
It's not needed anymore.

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

doc/examples: build gen-tp example by default

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

doc/examples: support BSD make

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

Tracepoint.h: replace assertion by fprintf and abort()

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

Remove unused assert.h from bitfield.h

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

Clarify probe registration documentation/errors

Fixes #513

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

Fix: Check C++ designated initializers support before compiling 'hello.cxx' test

Tested on a Ububtu system with g++ 4.6, g++ 4.7 and clang++.

Fixes #557

Signed-off-by: Zifei Tong <soariez@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Add mising include in ust.h

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

lttng-gen-tp: Fix include guard name with file using non valid characters

Now, the include guard will be generated with all the non
alpha-numeric characters replace with an '_'

Fixes #511

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

Fix: segfault when print invalid command

Fixes #556

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

Fix: Add --no-as-needed to the demo example's Makefile

Some distributions now ship with the --as-needed linker flag
set by default (Ubuntu 13.04). This will cause the linker to
remove the references to lttng-ust from the provider objects
thus causing the application to fail when preloading them.

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

zmalloc: attribute always_inline

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

Fix: liblttng-ust process startup hang when sessiond is stopped

Ensure the listener thread owns socket and notify_socket, so they don't
have to hold the ust_lock() while connecting to the sessiond and reading
from this socket.

Therefore, after process fork, we can safely cleanup those retources,
because the thread has been removed by the operating system. On exit,
however, let the OS teardown those sockets, so exit path does not race
with the listener thread.

Fixes #545

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

Move include directive from CFLAGS to LOCAL_CPPFLAGS in examples' Makefiles

The use of LOCAL_* flags and override directives ensures that the build
succeeds even if the user explicitly overrides CFLAGS/CPPFLAGS/LDFLAGS.

Fixes #537

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

Allow tracepoint providers to be compiled with g++

Move enumeration definition out of lttng_ust_lib_ring_buffer_config to
make them visible at global scope for C++ compilers.

Modify designated initializers: reordering initializers, add missing
initializers, reformat nested initializers, in order to make g++
compile.

Relevant discussion:

> So each field need to be listed ? We usually don't put NULL
> initialization for structures that are always in zero-initialized
> memory. (coding style)

This is related to a known issue of g++:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55606 (Bug 55606 - sorry,
unimplemented: non-trivial designated initializers not supported).

g++'s 'trivial designated initializers' means no out-of-order
initialization, no missing
initialization (except the fields on the tail of a struct), and nested
initialization should be done in the form {.foo = {.bar = 1}} instead of
{.foo.bar = 1}. That's why I made such modification.

> Are those changes also compatible with the LLVM c++ compiler ?
Actually, clang++ have designated initializers better supported than g++.
All the modification about designated initializers are not required for
clang++. No need to add NULL initialization, reorder initializations or
change {.foo.bar = 1} into {.foo = {.bar = 1}}. These (ugly) hacks are just
to make g++ happy.

[ Updates done by Mathieu Desnoyers to fix merge conflicts. Updated
  README. ]

Fixes #338

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

Add parameter -f to rm in Makefile clean target

If the files we want to delete do not exist (for example after a failed
build), the make clean fails.

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix: missing dependency for liblttng-ust-tracepoint.so

Fixes #538

Reported-by: Alexandros Frantzis <alexandros.frantzis@canonical.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Remove 0.x TODO

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

Add warning about default prefix and library paths to README

Fixes #467

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

Revert "Revert "Fix (another) linker library order""

This reverts commit a5b31eab4e1f190d68d51c47dabb60b64ee471e7.

The patch was OK in the first place. Explanation:

* Simon Marchi <simon.marchi@polymtl.ca> wrote:

Actually, $^ here is "demo.o", not "demo. Also, the libs should appear
after the objects on the command line. See the "-l" section in
http://gcc.gnu.org/onlinedocs/gcc/Link-Options.html. On most setup
this doesn't matter, since -Wl,--no-as-needed was the default pretty
much everywhere. Ubuntu decided to use -Wl,--as-needed to avoid
unnecessary dependencies, so the order becomes important. If you try
to manual build on a recent Ubuntu you will get undefined references
to dlopen and such. So this patch is good.

If you read carefully the log sent by Alexandre, you see that it is
when building the shared libs in this directory
(lttng-ust-provider-ust-tests-demo.so) that the build fails. I don't
know why it fails, but Alexandre hinted that passing "-fPIE -pie" to
build a shared library is weird (it is usually -fPIC -pic). I am not
sure where that comes from. This behaviour only happens when building
the package, not when building manually.

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

Revert "Revert "Fix linker library order""

This reverts commit 661805af83e2d4e7fa19432d6ae553460d6cd524.

The patch was OK in the first place. Explanation:

* Simon Marchi <simon.marchi@polymtl.ca> wrote:

Actually, $^ here is "demo.o", not "demo. Also, the libs should appear
after the objects on the command line. See the "-l" section in
http://gcc.gnu.org/onlinedocs/gcc/Link-Options.html. On most setup
this doesn't matter, since -Wl,--no-as-needed was the default pretty
much everywhere. Ubuntu decided to use -Wl,--as-needed to avoid
unnecessary dependencies, so the order becomes important. If you try
to manual build on a recent Ubuntu you will get undefined references
to dlopen and such. So this patch is good.

If you read carefully the log sent by Alexandre, you see that it is
when building the shared libs in this directory
(lttng-ust-provider-ust-tests-demo.so) that the build fails. I don't
know why it fails, but Alexandre hinted that passing "-fPIE -pie" to
build a shared library is weird (it is usually -fPIC -pic). I am not
sure where that comes from. This behaviour only happens when building
the package, not when building manually.

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

snprintf: play nice with static checker

Coverity complains that we pass a singleton as an array. Transform it
into an array of size 1.

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

tracepoint.c: Add coverity alloc/free annotations

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

Fix: "fields" leak on register

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

Fix: memory leak for events without fields

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

Fix: memory leak on connection reset

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

Revert "Fix linker library order"

This reverts commit 725e63c5194bfdcde0a2a3507aca156ba36cf49f.

Hrm, actually, these patches are wrong.

commit 725e63c5194bfdcde0a2a3507aca156ba36cf49f for instance:

"Libraries must be specified after the binary target."

 demo: demo.o
-       $(CC) -o $@ $(LIBS) $^
+       $(CC) -o $@ $^ $(LIBS)

the binary target here is "$@".

$^ is the source file name (demo.c).

this patch moves the source file name prior to the libraries, which is
incorrect (ref: gcc(1)). The input files should appear last.

So it breaks builds where $(LIBS) is non-empty.

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

Revert "Fix (another) linker library order"

This reverts commit a51ac6d9a011ba10b0be396dc1e801b2fc829651.

Hrm, actually, these patches are wrong.

commit 725e63c5194bfdcde0a2a3507aca156ba36cf49f for instance:

"Libraries must be specified after the binary target."

 demo: demo.o
-       $(CC) -o $@ $(LIBS) $^
+       $(CC) -o $@ $^ $(LIBS)

the binary target here is "$@".

$^ is the source file name (demo.c).

this patch moves the source file name prior to the libraries, which is
incorrect (ref: gcc(1)). The input files should appear last.

So it breaks builds where $(LIBS) is non-empty.

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

Fix: incorrect support for multi-context

* Zifei Tong <soariez@gmail.com> wrote:
> I did some debugging one this issue. The problem only occurs when we
> have more than one context field.
> So this will not work, too:
>
> lttng create
> lttng enable-event -a -u
> lttng add-context -u -t vpid
> lttng add-context -u -t vtid
> lttng start
> $@
> lttng stop
> sleep 1
> lttng view
> lttng destroy
>
> The problem I found out is wrong `fields` argument passed into
> `ustcomm_register_channel`.
> The `fields` argument passed is a pointer to the `event_field` of the
> first element in a `lttng_ctx_field` array, but not a
> `lttng_event_field` array as expected.

Fixes #529

Reported-by: Francis Giraldeau <francis.giraldeau@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix (another) linker library order

Libraries must be specified after the binary target.

Signed-off-by: Francis Giraldeau <francis.giraldeau@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix typo in run script

The actual library is liblttng-ust-libc-wrapper.so

Signed-off-by: Francis Giraldeau <francis.giraldeau@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix linker library order

Libraries must be specified after the binary target.

Signed-off-by: Francis Giraldeau <francis.giraldeau@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>

Fix examples: add missing CPPFLAGS

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

example Makefiles: standardize on $^ for linking

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

Fix demo example Makefile

Missing tp2.c in object file due to incorrect use of $<.

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

Move "hello-static-lib" to doc/examples and add non-automake Makefiles

The examples are now automatically built as part of the default make
target and plain Makefiles with no dependency on automake are provided
for clarity.

Update the manpage and README to reflect the change and remove lots of
trailing whitespace.

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

Version 2.2.0-rc2

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

manpage: Document probe provider compatibility

Fixes #502

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

Fix: add provider ABI compatibility check

There is not much we can do for this compatibility bug in lttng-ust 2.0
and 2.1 (already stable). Adding this check so that starting with
lttng-ust 2.2, when liblttng-ust encounters a probe provider with a
provider version major number higher than it supports, it will reject
it.

Fixes #502

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

Cleanup: ignore mktemp return value

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

Cleanup: documentation: argument vs field

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

Documentation: document undefined behavior for NULL pointers

Strings, arrays, sequences have undefined behavior if the pointer they
receive are NULL.

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

Cleanup: silence cppcheck error

Not an error per se, but silences:

/home/jenkins/workspace/lttng-ust-cppcheck/liblttng-ust/lttng-ring-buffer-client.h
429 uninitvar error Uninitialized variable: lttng_chan
/home/jenkins/workspace/lttng-ust-cppcheck/liblttng-ust/lttng-ring-buffer-metadata-client.h
197 uninitvar error Uninitialized variable: lttng_chan

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

Fix: add internal mutex for timer

Timer management is not called under ust_lock(). It is only called from
the consumer. Add internal locking for timer start/stop and
synchronization management.

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

32-bit warning fix for cyg profile fast

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

Fix warnings for 32-bit in lttng-ust-cyg-profile

In file included from ../include/lttng/ust-tracepoint-event.h:357,
                 from ../include/lttng/tracepoint-event.h:62,
                 from lttng-ust-cyg-profile.h:63,
                 from lttng-ust-cyg-profile.c:27:
././lttng-ust-cyg-profile.h: In function ‘__event_prepare_filter_stack__lttng_ust_cyg_profile___func_entry’:
././lttng-ust-cyg-profile.h:35: warning: cast from pointer to integer of different size
././lttng-ust-cyg-profile.h:35: warning: cast from pointer to integer of different size
././lttng-ust-cyg-profile.h:35: warning: cast from pointer to integer of different size
././lttng-ust-cyg-profile.h:35: warning: cast from pointer to integer of different size
././lttng-ust-cyg-profile.h: In function ‘__event_prepare_filter_stack__lttng_ust_cyg_profile___func_exit’:
././lttng-ust-cyg-profile.h:46: warning: cast from pointer to integer of different size
././lttng-ust-cyg-profile.h:46: warning: cast from pointer to integer of different size
././lttng-ust-cyg-profile.h:46: warning: cast from pointer to integer of different size
././lttng-ust-cyg-profile.h:46: warning: cast from pointer to integer of different size
  CCLD   liblttng-ust-cyg-profile.la
  CC     lttng-ust-cyg-profile-fast.lo
In file included from ../include/lttng/ust-tracepoint-event.h:357,
                 from ../include/lttng/tracepoint-event.h:62,
                 from lttng-ust-cyg-profile-fast.h:59,
                 from lttng-ust-cyg-profile-fast.c:27:
././lttng-ust-cyg-profile-fast.h: In function ‘__event_prepare_filter_stack__lttng_ust_cyg_profile_fast___func_entry’:
././lttng-ust-cyg-profile-fast.h:35: warning: cast from pointer to integer of different size
././lttng-ust-cyg-profile-fast.h:35: warning: cast from pointer to integer of different size

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

Typo fix in README

Fixes #505

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

Fix: tracepoint.h incorrect assumption about constructor order

Incorrect assumption about constructor execution order can trigger a
segfault when trying to execute tracepoint_register_lib.

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

Cleanup: comment mismatch with code

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

Fix: ABI breakage between 2.1 and 2.2-rc1

Removal of 2 callbacks was causing ABI breakage. This has been caught
in 2.2-rc1.

This was causing the application to segfault when tracing is active.

Fixes #486

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