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The current handling of invalid command line option arguments is
inconsistent:
- opt_llong_callback() treats non-numerical input the same as "-1",
which might or might not be rejected later.
- opt_int_callback() returns -1 on non-numerical input without an error
message, which makes parsing fail silently (libsubcmd will
automatically print the usage of the option only, no error message).
- custom callbacks abort command line parsing using fatal(), which
displays an error message and exits, without libsubcmd printing the
usage.
Unify this such that all invalid options, regardless of the format,
print an error message similar to the out of range case:
Error: --opt: 'value' is not a valid XY
followed by the usage of the option, e.g.:
$ rtla timerlat hist --period=1us
Error: --period: '1us' is not a valid number
Usage: rtla timerlat hist [<options>] [-h|--help]
-p, --period <us> timerlat period in us
As this is a libsubcmd help path, all option parsing failures now return
the exit code of 129 (help).
The unified handling is implemented using a new error message helper,
opt_err(), which is called from two new CLI-specific parsing functions,
strtoll_safe() and strtoi_safe(), as well as from custom helpers.
Option callback tests are updated to cover the new behavior.
Assisted-by: Claude:claude-opus-4-6
Reviewed-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/r/20260716144901.1187474-1-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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Several RTLA options do range validation inside the CLI parser layer
(e.g. -p/--period). When RTLA migrated CLI parsing to libsubcmd, this
logic was moved unchanged inside opt_*() callbacks.
Unify range validation so that all options use two newly added
functions, check_llong_range() and check_int_range(), to validate the
range.
The new range validation returns -1 from opt_*() callbacks rather than
hard-exit with fatal(), allowing the help message for the specific
option to be automatically displayed by libsubcmd logic.
Many options no longer need a custom callback, as they use the unified
range validation of opt_llong_callback() and opt_int_callback().
Validation for several other options is improved:
- timerlat -p/--period: lower bound raised from 1 to 100 us to match
the kernel's timerlat_min_period in trace_osnoise.c.
- timerlat -A/--aligned: reject negative values.
- timerlat --deepest-idle-state: add range [-1, INT_MAX]; previously,
values <= -2 were read as "option not set".
- timerlat -p/--period, -A/--aligned, -b/--bucket-size: properly reject
negative values instead of passing them to the tracer.
Remove unit tests for removed callbacks and test the new range
validation functionality of opt_llong_callback() and opt_int_callback().
Update runtime tests for histogram options to account for the new error
messages and exit value.
Assisted-by: Claude:claude-opus-4-6
Link: https://lore.kernel.org/r/20260710131554.338335-1-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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Test parsing of command line that sets an option and then unsets it back
to the default value in all tools.
Only two CLI tests are added for each tool: short period option (-p ...
--no-period) and long period option (--period ... --no-period). The
logic specific for individual options is tested in opt callback tests
already.
Reviewed-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/r/20260629083654.1548925-3-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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Test for each opt callback that implements the unset option whether the
option sets the specified default value back correctly.
Reviewed-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/r/20260629083654.1548925-2-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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Add both parse_args() and opt_* tests for the newly added -A/--aligned
option.
Assisted-by: Claude:claude-4.5-opus-high-thinking
Link: https://lore.kernel.org/r/20260527144928.2944472-2-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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In addition to testing all tool_parse_args() functions, test also all
callbacks used for parsing custom option formats.
The callbacks represent a middle layer between the parsing functions
and utility functions dedicated to checking specific argument formats,
for example, scheduling class and duration. Callback tests are run
before parsing functions to make sure any issue in the former is
reported before it is encountered through the latter.
Tests verify both successful parsing and proper rejection of invalid
inputs (via exit tests). To enable testing static callbacks, a pragma
once guard is added to timerlat.h for safe inclusion by cli_p.h.
Add dependency of UNIT_TESTS_IN on LIBSUBCMD_INCLUDES, as the new test
file tests/unit/cli_opt_callback.c includes cli_p.h which includes
subcmd/parse-options.h.
Link: https://lore.kernel.org/r/20260528103254.2990068-7-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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Add a test suite for the _parse_args() function of each tool that checks
the params structures (struct common_params, struct osnoise_params,
struct timerlat_params) returned by them for correctness.
One test case is added per option, as well as a few special cases for
tricky combinations of options. Test cases are ordered the same as the
option arrays and help message to allow easy checking of whether all
options are covered.
This should help clarify what the proper command line behavior of RTLA
is in case there are holes in the documentation and verify that the
intended behavior is implemented correctly.
A few necessary changes to the unit tests were done as part of this
commit:
- Unit tests now also link to libsubcmd and its dependencies.
- A new global variable in_unit_test is added to RTLA's CLI interface,
causing it to skip check for root if running in unit tests. This
allows the CLI unit tests to run as non-root, like existing unit
tests.
There is quite a lot of duplication, some of it is mitigated with macros,
but partially it is intentional so that future changes in behavior are
tracked across tools.
Link: https://lore.kernel.org/r/20260528103254.2990068-6-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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In case an action preceding the continue action fails, not only
the continue flag should not be set, it should be unset if it was set
from a previous run of actions_perform().
Add a unit test to check if this is implemented correctly.
Link: https://lore.kernel.org/r/20260526102523.2662391-2-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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Add unit tests covering all functions in the actions module, including
both valid and invalid inputs and all action types, except for
actions_perform(), where only shell and continue actions are tested.
To support testing multiple modules, the unit test build was modified so
that it links the entire rtla-in.o file. For this to work, the main()
function in rtla.c was declared weak, so that the unit test main is able
to override it.
Other included minor changes to unit tests are:
- Make unit test output verbose to show which tests are being run, now
that we have more than 3 tests.
- Add unit_tests file to .gitignore.
- Split unit test sources to one file per test suite, and keep only
main() function in unit_tests.c.
- Fix Makefile dependencies so that "make unit-tests" will rebuild the
binary with the changes in the commit.
Also with the linking the entire rtla-in.o file, it now has rtla's
nr_cpus symbol, so the declaration in utils unit tests is made extern.
Assisted-by: Composer:composer-2-fast
Link: https://lore.kernel.org/r/20260424140244.958495-1-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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sysconf(_SC_NPROCESSORS_CONF) (via get_nprocs_conf) reflects
cpu_possible_mask, which is fixed at boot time, so querying it
repeatedly is unnecessary.
Replace multiple calls to sysconf(_SC_NPROCESSORS_CONF) with a single
global nr_cpus variable initialized once at startup.
`#pragma once` in timerlat_u.h is needed for pre-C23 compilers to avoid
redefinition errors.
Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
Link: https://lore.kernel.org/r/20260306194953.2511960-2-costa.shul@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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Add unit tests for utility functions in src/utils.c using the Check
testing framework. The tests verify parse_cpu_set(), strtoi(), and
parse_prio() functions.
Unit tests are built conditionally when libcheck is available.
Run tests with 'make unit-test'.
The test framework uses the Check library which provides process
isolation for each test, preventing failures in one test from
affecting others.
Signed-off-by: Costa Shulyupin <costa.shul@redhat.com>
Link: https://lore.kernel.org/r/20260119105857.797498-3-costa.shul@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>
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Tomas Glozar
Costa Shulyupin