Fix: Mishandled NULL short options in lttng-sessiond

set_option() ignores any option which has no short option
defined.

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

Use popt "required_argument" and "no_argument" constants

Use popt's provided constants for the "has_arg" field of long
options instead of hardcoding 0 and 1 everywhere.

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

Fix: Mishandled NULL short options in utils_generate_optstring()

The NULL character is used to indicate that no short option is
available for a given command.

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

Fix: only launch a new session daemon for the "create" command

Fixes #859

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

Fix 'daemon' typo in lttng-ctl-pc.in description

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

Fix: clean-up agent app hash table from the main sessiond thread

The agent application hash table, which is allocated by the session
daemon's main thread, is free'd from the agent application registration
thread.

This leads to a number of interesting scenarios under which the agent
app registration thread may encounter an error, thus tearing itself down
and freeing the agent_apps_ht_by_sock hash table. Of course, nothing then
prevents the client processing thread from accessing this invalidated hash
table to list, enable or disable agent events which leads to crashes or
assertions hitting in ht_match_reg_uid().

However, it is not necessary for the agent app registration thread to
encounter an error for this to prove problematic. As shown in bug #893,
the session daemon's teardown will assert on a NULL key in
ht_match_reg_uid() whenever it is performed while a JUL, Log4J or Python
event is still enabled in a session. This happens because the session
daemon's clean-up triggers the destruction of all sessions. The destruction
of those sessions would access the free'd agent_apps_ht_by_sock to disable
the registered agent events.

Fixes #893

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

Fix: Remove undocumented session daemon short options

Fixes #864

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

Comment grammar correction

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

Log userspace application hash table allocation failure

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

Fix: RCU read-side lock released too early in destroy_agent_app

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

Fix: misleading logging statement in agent_find_event

An _event_ is not found, not an agent.

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

Fix: Unhandled domain option condition in list_agent_events

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

Fix: Crash on lttng list -j/-l/-p when no events are present

The lttng client will free an uninitialized pointer whenever a the
lttng list command is invoked on a domain which involves the log4j,
JUL or Python agents.

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

Clean-up: spelling fix in a comment

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

Document relay_add_stream RCU locking

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

Fix: Unbalanced rcu_read_unlock() on stream file creation failure

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

Fix: Unbalanced rcu_read_unlock() on directory creation failure

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

Fix: Document the locking assumptions of ctf_trace_find_by_path()

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

Fix: Memory leak in relay_add_stream error path

Failing to allocate a struct ctf_trace results in the leak of a stream's
path and channel name.

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

Update master version to v2.8.0-pre

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

Update version to v2.7.0-rc1

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

Tests: lttng-ust-getcpu-override-test cache and error-check sysconf()

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

Tests: lttng-ust-getcpu-override coding-style adjustments

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

Add CPU_ID LTTng-UST context to enum lttng_ust_context_type

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

Bump LTTNG_UST_ABI_MAJOR_VERSION to 6

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

Tests: Ust getcpu override plugin

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: Follow struct dirent allocation guidelines of READDIR(3)

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

Update comments regarding the power of 2 constraint on sub-buffer sizes

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Build: add Flex version check

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Build: add Bison version check

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: handle sys_futex() FUTEX_WAIT interrupted by signal

We need to handle EINTR returned by sys_futex() FUTEX_WAIT, otherwise a
signal interrupting this system call could make sys_futex return too
early, and therefore cause a synchronization issue.

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

Fix: metadata push -EPIPE should be recoverable

This return value can be caused by application terminating concurrently
(when using per-PID buffers), so it should not make the consumer
management thread exit.

CC: Aravind HT <aravind.ht@gmail.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: destroy session removes the default config file

Destroy session command by default removes the default config file
without checking the current session. As a result when we call any
other command which expects a default session by calling
get_session_name() function, it fails.

This patch will fix this by checking that the default config file gets
removed only when destroy session is called with the current session.

Fixes: #887
Signed-off-by: Partha Pratim Mukherjee <ppm.floss@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Build: bump autoconf version requirement to 2.64

AC_INIT with package_url was introduced in AC 2.64

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: Memory leak in setup of relayd_path

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

Fix: update liburcu URL

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

Fix: test: use "$@" to pass and quote argument

${*} expands wildcard and does not preserve initial arguments.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Refactor: test: wrapper for lttng_snapshot_del_output

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Refactor: test: wrapper for lttng_snapshot_add_output

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Refactor: test: wrapper for destroy_lttng_session

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Refactor: test: wrapper for stop_lttng_tracing

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Refactor: test: wrapper for start_lttng_tracing

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Refactor: test: wrapper for enable_ust_lttng_event

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Refactor: test: wrapper for enable_ust_lttng_channel

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Refactor: test: wrapper for create_lttng_session

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: Memory allocated by xmlNodeGetContent() must be freed by xmlFree()

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

Save/load: add support for shared memory path

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: get_cmdline_by_pid path length assumes a max pid of 65535

PROC(5) mentions that "On 64-bit systems, pid_max can be set to any
value up to 2^22 (PID_MAX_LIMIT, approximately 4 million)."

We use 32 bits for simplicity's sake.

Reported-by: Zhenyu Ren <zhenyu.ren@aliyun.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Clean-up: Remove ifdef-ed out lttng list options

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

Test: mi: test for greater or equal to a minimum of events on ust listing.

Since the number of events present in the tests apps in prone to change it
make more sense to look for a minimum of events. This is less rigourous
but more flexible to change.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: update regression tests involving UST

This patch fixes previously failing regression tests which involve
either the UST statedump or helper events, following a refactor and
rename.

Signed-off-by: Antoine Busque <abusque@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Clean-up: Remove ifdef-ed out function:entry feature

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

Fix: Mark MI and Config string declarations as extern

This fixes a build issue with GCC 5.1 which would complain about
these symbols being defined multiple times.

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

Clean-up append_list_to_probes()

Remove unecessary "index" variable and cur_mod increment which was
probably meant to increment "index", a bug fixed by 9ae17e2.

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

Fix: modprobe.c: fix tmp_list memory leak

Reported-by: Hannes Weisbach <hannes.weisbach@mailbox.tu-dresden.de>
Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: append_list_to_probes(): increment index

Reported-by: Hannes Weisbach <hannes.weisbach@mailbox.tu-dresden.de>
Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Docs: LTTNG(1) filtering is now supported by the kernel tracer

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

Fix: live_test regression on large number of cpus

Merge fixes from Babeltrace lttng-live plugin, especially about
incorrect use of send() and recv().

Can be triggered with 32 virtual processors visible on the system with
the root_regression test suite.

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

Fix: set UST register timeout to -1 as test default

On busy systems, it's possible to spuriously hit the default 3 seconds
timeout for UST registration to sessiond, thus causing tests to be flaky
on those systems.

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

Man page: reference lttng-crash under --shm-path option

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Tests: Don't rely on implicit scalar expression dereference

This silences an "experimental feature" warning when using Perl 5.20.2.

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

man pages: use standard NAME format

As per man(7):

    The only mandatory heading is NAME, which should
    be the first section and be followed on the next
    line by a one-line description of the program:

        .SH NAME
        item \- description

    It is extremely important that this format is followed,
    and that there is a backslash before the single dash
    which follows the item name. This syntax is used by the
    mandb(8) program to create a database of short
    descriptions for the whatis(1) and apropos(1) commands.

Furthermore (lexgrog(1)):

    When using the traditional man macro set, a correct NAME
    section looks something like this:

        .SH NAME
        foo \- program to do something

    Some manual pagers require the ‘\-’ to be exactly as shown;
    mandb is more tolerant, but for compatibility with other
    systems it is nevertheless a good idea to retain the
    backslash.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix python bindings' Makefile for out-of-tree builds

The references to the built archives should use top_builddir and not
top_srcdir, because that's where they are.

And new in V2, I got a new error:

  lttng_wrap.c:2970:25: fatal error: lttng/lttng.h: No such file or directory
   #include <lttng/lttng.h>

I think we are missing the -I$(top_srcdir)/include. I had not noticed this
previously, probably because I had an lttng/lttng.h in
/usr/local/include or /usr/include. Also, the other includes seem
unnecessary. The This is not really related to out-of-tree builds though.

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: use LIBS instead of AM_LDFLAGS for dl and c linking

The change to --as-needed on linking of the tool chain on Debian based dist
break the build. This fix aim to generalize the linking and be
independent of the distribution choice of base parameter for the linking
process.

Signed-off-by: Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: Add missing -ldl when checking for lttng-ust

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

clock plugin: increase offset measurement accuracy

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

Implement UST clock override plugin support

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

Fix: ownership of filter and filter_expression

Applies to the kernel wildcard feature.

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

Fix: zero memory passed to create channel kernel ioctl

Valgrind complains about uninitialized memory passed to ioctl.

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

Fix: Check that lttng create --live's time is not zero

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

Fix: Validate lttng_create_session_live's timer is > 0

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

UI: Only show live timer when the session is in live mode

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

UI: Only show tracker PID state when enabled

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

Implement kernel filter support

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

syscall tracing: update tests

Update syscall tracing tests following the semantic changes of enablers
in lttng-modules and disable behavior of lttng-sessiond.

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

Support lttng-modules syscall wildcards

While we are there, fix semantic issues with disable-event and various
types of instrumentation.

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

Implement lttng-modules tracepoint wildcard support

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

Fix build when configuring with --disable-lttng-ust

Mark trace_ust_list_tracker_pids as static inline to eliminate
"multiple definition" error.

Fix ust_app_global_update() stub to reflect the signature change
introduced by a9ad0c8f

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

Fix: add missing function prototype to trace-ust.h header

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

Implement PID tracker content listing

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

Implement UST PID tracker

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

Cleanup: Remove unimplemented UST domains

They will be implemented as options of the UST domains.

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

Implement PID tracking for kernel tracing

Implement PID tracking (per-session) for kernel tracing. Only
save/restore and MI are missing.

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

Fix: leak on error in lttng-crash

Found by Coverity:
** CID 1291945:  Resource leaks  (RESOURCE_LEAK)
/src/bin/lttng-crash/lttng-crash.c: 769 in copy_crash_data()

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

Man page fixes: missing --version option and typo

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

Docs: add lttng-crash(1) man page

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

Docs: lttng-crash refers to "lttng"

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

Fix: possible use of uninitialized data in loglevel conversion funcs

str will be uninitialized if inputstr[0] == '\0'

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

Fix: possible evaluation of garbage values in fini_validation_ctx()

Zero-out struct validation_ctx on creation.

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

Cleanup: Remove stale #ifdef-ed-out code from spawn_viewer()

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

Fix: Possible call to execvp with NULL argument on allocation failure

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

Fix: Possible call to strtoul() with NULL argument

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

Docs: clarify lttng.1 shm-path section

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

Fix: Missing return value check in extract_trace_recursive()

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

Fix: recursive_rmdir: empty all empty subdir

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

Move file creation/unlink from liblttng-ust-ctl to consumerd

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

lttng-crash: support recursive traces

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

shm-path: remove directory hierarchy on destroy

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

Implement --shm-path option for UST sessions (per-uid channels)

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

Cleanup: Reduce scope of connections in main relayd thread

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