Fix: call xmlCleanupParser to free global libxml2 allocations

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

Fix: missing "void" parameter of lib constructor and destructor

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

Docs: fix comment typos in lttng-sessiond's main.c

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

Fix: lttng-relayd allow binding of privileged ports for non-root users

Non-root users could use authbind to bind to low-numbered ports.
Moreover, the check was inverted; !getuid() will only be true
for the root user.

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

relayd: optimize receive throughput

For channels configured with large sub-buffer size, the relayd copies
the entire trace sub-buffer (trace packet) into a large buffer, and then
copies the large buffer to disk. It is inefficient from a point of view
of cache locality.

Use a 64k buffer on the stack instead, and move the data piece-wise.

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

Clean-up: harmonize kernctl API error checking

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

Introduce LTTNG_IOCTL_CHECK and LTTNG_IOCTL_NO_CHECK macros

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

Fix: enforce assumption that lttng-modules ioctl() return <= 0

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

Fix: reduce scope of kconsumer consumed_pos and produced_pos

The consumed_pos and produced_pos accesses are protected by the
stream mutex, which is fine as-is. However, consumed_pos is
passed to consumer_get_consume_start_pos() and is flagged by
Coverity as a possible use of a "stale" consumed_pos.

From an analyzer's standpoint, this makes sense since
both lttng_kconsumer_get_produced_snapshot() and
lttng_kconsumer_get_consumed_snapshot() could leave their output
parameter uninitialized and return 0 since they both  assume that
ioctl() will set errno if ret != 0.

IOCTL(3P) specifies that errno is only set if ret < 0.

A bug in lttng-modules could cause ioctl() to return a positive
value, leaving the errno variable unset. In such a case,
both functions would return 0, leaving the positions uninitialized.

A follow-up fix enforces this assumption (ret never > 0) as part
of the kernctl API.

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

Docs: document safety of consumer_thread_is_ready access

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

Clean-up: unused ret values in thread_manage_health

Reported by Coverity as:
CID 1243014 (#1 of 15): Unused value (UNUSED_VALUE)

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

Clean-up: remove dead code in sessiond's set_option()

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

Fix: set the logger level to prevent unexpected level inheritance

BSF and other jars can ship with an embedded log4j.properties
file. This causes problem when launching an application with a general
class path (e.g /usr/share/java/*) since log4j will look for a
configuration file in all loaded jars. If any contains a directive for
the root logger, it will affect any logger with no level that are
directly under the root logger. This can 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: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Typo: Stoping -> Stopping

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

Typo: occured -> occurred

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

Fix: only perform lttng_consumer_sync_trace_file() in local mode

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

Make lttng_consumer_sync_trace_file static

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

Fix: don't negate posix_fadvise return value to check error

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

Fix Solaris 10 build: use lttng_strnlen() wrapper

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

Rename lttng_error_type to lttng_error_level

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

Cleanup error.h __lttng_print() used for message printing

The loglevels have never really been a mask, and it is useless to try to
use them as masks, because the compiler statically knows the value of
the loglevel requested, and can therefore optimise away all the logic.

This takes care of Coverity warning about mixed bitwise and boolean
logic, which was technically correct, but more complex than needed.

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

Update coding style document for macro style

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

Fix: coding style document has erroneous semicolon at end of macro

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

Fix: add missing semicolons after MSG, DBG, ERR print macros

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

Tests: inverted condition in test_kernel_data

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

OOT build fix: asciidoc.conf is now a source file

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

lttng-create(1): use attributes for default ports

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

lttng-create(1): add xrefs to creation mode definitions

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

lttng-create(1): use the correct DATAPORT/CTRLPORT variables

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

lttng-create(1): use def list for net protocols

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

lttng-create(1): add relay mode

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

doc/man: put AsciiDoc attributes in their own file

This facilitates the generation of man pages using another
asciidoc.conf file, but keeping the same attributes, without
having to split the generated configuration file.

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

test: UST tracing destroy flush behavior with tracefile rotation

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

test: kernel tracing destroy flush behavior with tracefile rotation

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

Add environment variable to allow abort on error

The new environment variable LTTNG_ABORT_ON_ERROR allows each
lttng-tools program to call abort() on PERROR() and ERR() after the
error message has been printed to stderr.

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

Fix: ust-consumer: flush empty packets on snapshot channel

Snapshot operation on a non-stopped stream should use a "final" flush to
ensure empty packets are flushed, so we gather timestamps at the moment
where the snapshot is taken. This is important for streams that have a
low amount of activity, which might be on an empty packet when the
snapshot is triggered.

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

Fix: WARN() should print as WARN level, not ERR

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

Fix: error.h: add missing parenthesis around macro parameter

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

Fix: bogus mask on error.h PRINT types

PRINT_ERR maps to 0x1, PRINT_WARN maps to 0x2, which is fine so far to
use as masks, but PRINT_BUG maps to 0x3, which is the same as both
PRINT_ERR and PRINT_WARN, and does not make sense to use in masks with
__lttng_print:

  (type & (PRINT_WARN | PRINT_ERR | PRINT_BUG))

Fix this by ensuring PRINT_BUG has its own mask, and express all
constants as shifts to eliminate the risk of re-introducing a similar
bug in the future.

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

Fix: kernel tracing: flush after stop

We should flush the last packet after stop, not before. Otherwise, we
may end up with events written immediately after the flush, which
defeats the purpose of flushing.

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

Fix: UST should not generate packet at destroy after stop

In the following scenario:
- create, enable events (ust),
- start
- ...
- stop (await for data_pending to complete)
- destroy
- rm the trace directory

We would expect that the "rm" operation would not conflict with the
consumer daemon trying to output data into the trace files, since the
"stop" operation ensured that there was no data_pending.

However, the "destroy" operation currently generates an extra packet
after the data_pending check (the "on_stream_hangup"). This causes the
consumer daemon to try to perform trace file rotation concurrently with
the trace directory removal in the scenario above, which triggers
errors. The main reason why this empty packet is generated by "destroy"
is to deal with trace start/stop scenario which would otherwise generate
a completely empty stream.

Therefore, introduce the concept of a "quiescent stream". It is
initialized at false on stream creation (first packet is empty). When
tracing is started, it is set to false (for cases of start/stop/start).
When tracing is stopped, if the stream is not quiescent, perform a
"final" flush (which will generate an empty packet if the current packet
was empty), and set quiescent to true.  On "destroy" stream and on
application hangup: if the stream is not quiescent, perform a "final"
flush, and set the quiescent state to true.

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

Tests: remove flaky '*' kernel wildcard test

The test case for '*', which enables all events, is flaky by its
nature since buffers may be filled by other kernel events preventing
the test script from finding the test event (it is often discarded).

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

Fix: bad file descriptors on close after rotation error

Ensure we don't try to close output stream file descriptors twice when a
trace file rotation error occurs (once at tracefile rotation, once when
closing the stream). Set the fd value to -1 after the first close to
ensure we don't try to close it again.

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

Fix: configure.ac: allow --disable-python-bindings

Without using $enableval, it's not possible to disable the
Python bindings using --disable-python-bindings.

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

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: Jérémie Galarneau <jeremie.galarneau@efficios.com>

Fix: posix_fadvise wrapper returns -ENOSYS on FreeBSD

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

Fix: Double free in utils_partial_realpath error path

Fixes coverity #1355521

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

Fix: remove logically dead code in send_channel_uid_to_ust

Found by Coverity:

at_most: At condition ret < 0, the value of ret must be at most -1.
    cannot_set: At condition ret < 0, the value of ret cannot be equal
to any of {-1030, -32}.
    dead_error_condition: The condition ret < 0 must be true.
2825                        } else if (ret < 0) {
2826                                goto error_stream_unlock;
2827                        }
    CID 1323135 (#1 of 1): Logically dead code
(DEADCODE)dead_error_line: Execution cannot reach this statement: goto
error_stream_unlock;.

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

Fix: unchecked return value in low throughput test

Found by Coverity:

CID 1019967 (#1 of 1): Unchecked return value from library
(CHECKED_RETURN)2. check_return: Calling poll(NULL, 0UL, 60000) without
checking return value. This library function may fail and return an
error code.

We really don't care whether this poll succeeds or not.

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

Tests: abort() exclusion test on allocation failure

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

Fix: unchecked posix_fadvise() return value

Found by Coverity:

CID 1019971 (#1 of 1): Unchecked return value from library
(CHECKED_RETURN)2. check_return: Calling posix_fadvise(outfd,
orig_offset - stream->max_sb_size, stream->max_sb_size, 4) without
checking return value. This library function may fail and return an
error code.

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

Fix: unchecked return value in relayd live.c

CID 1323137 (#1 of 1): Unchecked return value (CHECKED_RETURN)30.
check_return: Calling viewer_stream_get without checking return value
(as is done elsewhere 5 out of 6 times).

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

Fix: unchecked return value in trace_clock_read64_monotonic

Found by Coverity:

CID 1311498 (#1 of 1): Unchecked return value (CHECKED_RETURN)1.
check_return: Calling clock_gettime without checking return value (as is
done elsewhere 8 out of 9 times).

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

Clean-up: remove unnecessary blank line

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

Fix: initialize the cur_event variable before using it

CID 1243041 (#1 of 1): Uninitialized scalar variable (UNINIT)
uninit_use_in_call: Using uninitialized element of array *cur_event.name when
calling strcmp.

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

Fix: Dereference after NULL check in consumer

Dereference after NULL check in consumer discarded events/lost packets
commands.

Found by Coverity:

CID 1040158 (#1 of 2): Dereference after null check (FORWARD_NULL)24.
var_deref_op: Dereferencing null pointer channel.

CID 1040158 (#2 of 2): Dereference after null check (FORWARD_NULL)24.
var_deref_op: Dereferencing null pointer channel.

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

Tests: abort test on memory allocation failure

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

Fix: pointer dereference after NULL check in test_create_ust_event_exclusion

CID 1256182 (#2 of 2): Dereference after null check (FORWARD_NULL)16.
var_deref_op: Dereferencing null pointer exclusion.

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

Fix: NULL pointer dereference in relay_index_get_by_id_or_create

Found by Coverity:

CID 1323134 (#1 of 1): Dereference after null check (FORWARD_NULL)34.
var_deref_op: Dereferencing null pointer index.

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

Clean-up verbosity incrementation in set_option

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

Fix: Deference after null check in sessiond set_option

Found by Coverity:

2. var_compare_op: Comparing arg to null implies that arg might be null.

CID 1256137 (#1 of 9): Dereference after null check (FORWARD_NULL)14.
var_deref_model: Passing null pointer arg to strdup, which dereferences
it.

[... same for #2 through #9 ]

This should not really be an issue since
1) options that use the "arg" parameter will not be set by popt if one
   is not provided,
2) the configuration file parser will never invoke set_option with
   a NULL argument; if no "value" is provided in the file, an empty
   string is passed.

The second point is the reason for the "arg && arg[0] == '\0'" check;
we already know that the argument is invalid since an empty string
is never a valid argument for the supported options.

Nonetheless, it makes sense for Coverity to flag this and moving
the check to individual cases, although very verbose, is clear.

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

Docs: clarify comment in parse_pid_string()

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

Fix: Wrong sizeof argument in pid tracker

Found by Coverity:

CID 1292557 (#1 of 1): Wrong sizeof argument
(SIZEOF_MISMATCH)suspicious_sizeof: Passing argument 8UL /* sizeof
(*_pid_list) */ to function zmalloc and then casting the return value to
int * is suspicious.

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

Fix: tests: incorrect uri index

Initial issue found by Coverity:

CID 1322864 (#1 of 1): Constant expression result
(CONSTANT_EXPRESSION_RESULT)impossible_and: The "and" condition size ==
2L && (uri + 0).dtype == LTTNG_DST_IPV4 && (uri + 0).utype ==
LTTNG_URI_DST && (uri + 0).stype == 0U && (uri + 0).port == 8989 &&
strcmp((uri + 0).subdir, "my/test/path") == 0 && strcmp((uri +
0).dst.ipv4, "127.0.0.1") == 0 && (uri + 1).dtype == LTTNG_DST_IPV4 &&
(uri + 1).utype == LTTNG_URI_DST && (uri + 1).stype == 0U && (uri +
1).port == 4242 && strcmp((uri + 0).subdir, "my/test/path") == 0 &&
strcmp((uri + 1).dst.ipv4, "127.0.0.1") == 0 can never be true because
(uri + 0).subdir cannot be equal to two different values at the same
time.

Review of the test source file led to further fixes.

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

Fix: Integer overflowed argument

Found by Coverity:

CID 1242317 (#1 of 2): Integer overflowed argument (INTEGER_OVERFLOW)25.
overflow_sink: Overflowed or truncated value (or a value computed from
an overflowed or truncated value) new_nbmem * 304UL used as critical
argument to function.

CID 1242317 (#2 of 2): Integer overflowed argument (INTEGER_OVERFLOW)27.
overflow_sink: Overflowed or truncated value (or a value computed from
an overflowed or truncated value) (new_nbmem - nbmem) * 304UL used as
critical argument to function.

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

Fix: macro compares unsigned to 0 (no effect)

Found by Coverity:

CID 1262117 (#1 of 1): Macro compares unsigned to 0
(NO_EFFECT)unsigned_compare: This greater-than-or-equal-to-zero
comparison of an unsigned value is always true. events->nb_fd >= 0U.

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

Fix: Free variable before strdup() in process_event_node

Fixes coverity #1243040

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

Fix: Free variables before strdup()

Fixes coverity #1243047 and #1243050

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

Fix: Add missing free() in spawn_viewer

Fixes coverity #1291948

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

Fix: Add missing free() in utils_partial_realpath

Fixes coverity #1328401

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

Fix: Use distinct variables for ret and discarded_events

Fix coverity #1352682

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

Fix: Don't try to show manpage when argv is null

Fixes coverity #1353461

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

Fix: Use secure_getenv() in get_man_bin_path

Fixes coverity #1353462

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

Fix: illegal memory access in test_create_ust_event_exclusion

Found by Coverity:
CID 1243019 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)1. buffer_size_warning: Calling strncpy with a
maximum size argument of 256 bytes on destination array ev.name of size
256 bytes might leave the destination string unterminated.

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

Fix: illegal memory access in test_create_ust_event

Found by Coverity:
CID 1243026 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)1. buffer_size_warning: Calling strncpy with a
maximum size argument of 256 bytes on destination array ev.name of size
256 bytes might leave the destination string unterminated.

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

Fix: illegal memory access in test_create_kernel_event

Found by Coverity:
CID 1243030 (#1 of 1): Buffer not null terminated (BUFFER_SIZE_WARNING)1.
buffer_size_warning: Calling strncpy with a maximum size argument of 256
bytes on destination array ev.name of size 256 bytes might leave the
destination string unterminated.

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

Fix: illegal memory access in test_create_ust_channel

Found by Coverity:
CID 1243032 (#1 of 1): Buffer not null terminated (BUFFER_SIZE)1.
buffer_size: Calling strncpy with a source string whose length (8 chars)
is greater than or equal to the size argument (8) will fail to
null-terminate attr.name.

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

Fix: illegal memory access in send_viewer_streams

Found by Coverity:

CID 1243037 (#1 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)18. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array
send_stream.path_name of size 4096 bytes might leave the destination
string unterminated.

CID 1243037 (#2 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)18. buffer_size_warning: Calling strncpy with a
maximum size argument of 255 bytes on destination array
send_stream.channel_name of size 255 bytes might leave the destination
string unterminated.

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

Simplify rcu locking in viewer_list_sessions

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

Fix: illegal memory access in viewer_list_sessions

Found by Coverity:

CID 1243025 (#1 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)17. buffer_size_warning: Calling strncpy with a
maximum size argument of 64 bytes on destination array
send_session->hostname of size 64 bytes might leave the destination
string unterminated.

CID 1243025 (#2 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)17. buffer_size_warning: Calling strncpy with a
maximum size argument of 255 bytes on destination array
send_session->session_name of size 255 bytes might leave the destination
string unterminated.

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

Fix: illegal memory access in relayd_add_stream

Found by Coverity:

CID 1243017 (#1 of 4): Buffer not null terminated
(BUFFER_SIZE_WARNING)14. buffer_size_warning: Calling strncpy with a
maximum size argument of 264 bytes on destination array msg.channel_name
of size 264 bytes might leave the destination string unterminated.

ID 1243017 (#2 of 4): Buffer not null terminated
(BUFFER_SIZE_WARNING)14. buffer_size_warning: Calling strncpy with a
maximum size argument of 264 bytes on destination array
msg_2_2.channel_name of size 264 bytes might leave the destination
string unterminated.

CID 1243017 (#3 of 4): Buffer not null terminated
(BUFFER_SIZE_WARNING)15. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array msg.pathname of
size 4096 bytes might leave the destination string unterminated.

CID 1243017 (#4 of 4): Buffer not null terminated
(BUFFER_SIZE_WARNING)15. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array
msg_2_2.pathname of size 4096 bytes might leave the destination string
unterminated.

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

Fix: illegal memory access in relayd_create_session_2_4

Found by Coverity:
CID 1243024 (#1 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)2. buffer_size_warning: Calling strncpy with a
maximum size argument of 255 bytes on destination array msg.session_name
of size 255 bytes might leave the destination string unterminated.

CID 1243024 (#2 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)3. buffer_size_warning: Calling strncpy with a
maximum size argument of 64 bytes on destination array msg.hostname of
size 64 bytes might leave the destination string unterminated.

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

Fix: illegal memory access in session_create

Found by Coverity:

CID 1323138 (#1 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)3. buffer_size_warning: Calling strncpy with a
maximum size argument of 64 bytes on destination array session->hostname
of size 64 bytes might leave the destination string unterminated.

CID 1323138 (#2 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)3. buffer_size_warning: Calling strncpy with a
maximum size argument of 255 bytes on destination array
session->session_name of size 255 bytes might leave the destination
string unterminated.

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

Fix: illegal memory access in consumer_set_subdir

Found by Coverity:
CID 1243015 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)8. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array
consumer->subdir of size 4096 bytes might leave the destination string
unterminated.

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

Fix: illegal memory access in syscall_init_table

Found by Coverity:
CID 1243021 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)25. buffer_size_warning: Calling strncpy with a
maximum size argument of 255 bytes on destination array (syscall_table +
index).name of size 255 bytes might leave the destination string
unterminated.

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

Fix: illegal memory access in write_pidfile

Found by Coverity:
CID 1243023 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)3. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array pidfile_path of
size 4096 bytes might leave the destination string unterminated.

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

Fix: illegal memory access in list_lttng_channels

Found by Coverity:
CID 1243018 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)11. buffer_size_warning: Calling strncpy with a
maximum size argument of 256 bytes on destination array (channels +
i).name of size 256 bytes might leave the destination string
unterminated.

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

Fix: illegal memory access in cmd_snapshot_record

Found by Coverity:
CID 1243027 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)20. buffer_size_warning: Calling strncpy with a
maximum size argument of 255 bytes on destination array tmp_output.name
of size 255 bytes might leave the destination string unterminated.

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

Fix: illegal memory access in output_init

Found by Coverity:

CID 1243028 (#1 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)5. buffer_size_warning: Calling strncpy with a
maximum size argument of 255 bytes on destination array output->name of
size 255 bytes might leave the destination string unterminated.

CID 1243028 (#2 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)10. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array
output->consumer->dst.trace_path of size 4096 bytes might leave the
destination string unterminated.

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

Fix: illegal memory access in consumer_set_network_uri

Found by Coverity:
CID 1243029 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)31. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array obj->subdir of
size 4096 bytes might leave the destination string unterminated.

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

Fix: illegal memory access in cmd_snapshot_list_outputs

Found by Coverity:

CID 1243031 (#1 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)22. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array (list +
idx).ctrl_url of size 4096 bytes might leave the destination string
unterminated.

CID 1243031 (#2 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)26. buffer_size_warning: Calling strncpy with a
maximum size argument of 255 bytes on destination array (list +
idx).name of size 255 bytes might leave the destination string
unterminated.

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

Fix: illegal memory access in list_events

Found by Coverity:
CID 1243022 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)23. buffer_size_warning: Calling strncpy with a
maximum size argument of 256 bytes on destination array (tmp_events +
i).name of size 256 bytes might leave the destination string
unterminated.

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

Fix: illegal memory access in disable_event

Found by Coverity:
CID 1243016 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)14. buffer_size_warning: Calling strncpy with a
maximum size argument of 256 bytes on destination array msg.name of size
256 bytes might leave the destination string unterminated.

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

Fix: illegal memory access in enable_event

Found by Coverity:
CID 1243033 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)16. buffer_size_warning: Calling strncpy with a
maximum size argument of 256 bytes on destination array msg.name of size
256 bytes might leave the destination string unterminated.

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

Fix: illegal memory access in add_uri_to_consumer

Found by Coverity:

CID 1243038 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)15. buffer_size_warning: Calling strncpy with a
maximum size argument of 4096 bytes on destination array
consumer->dst.trace_path of size 4096 bytes might leave the destination
string unterminated.

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

Fix: illegal memory access in init_ust_event_from_agent_event

Found by Coverity:
CID 1321741 (#1 of 1): Buffer not null terminated
(BUFFER_SIZE_WARNING)1. buffer_size_warning: Calling strncpy with a
maximum size argument of 256 bytes on destination array
ust_event->attr.name of size 256 bytes might leave the destination
string unterminated.

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

Simplify free() of channel attribute

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

Fix: illegal memory access in _cmd_enable_event

Found by Coverity:

CID 1321742 (#1 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)21. buffer_size_warning: Calling strncpy with a
maximum size argument of 256 bytes on destination array attr->name of
size 256 bytes might leave the destination string unterminated.

CID 1321742 (#2 of 2): Buffer not null terminated
(BUFFER_SIZE_WARNING)22. buffer_size_warning: Calling strncpy with a
maximum size argument of 256 bytes on destination array attr->name of
size 256 bytes might leave the destination string unterminated.

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

Implement lttng_strncpy safe string copy

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

Add missing symbol to preserve ABI compatibility of liblttng-ctl

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