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tests: Emulate multithreading environment for unit tests

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The main purpose of this patch is to run unit tests on BSD family
of OSes. The root cause is `fileno` syscall which is a macro that
can be expanded to either a function call (for multi-threaded
environment) or to inline code (for single-threaded environment).
Said inline code accesses private field of file descriptor, and
this construction is impossible to mock in unit tests. Multi-
threaded environment has `fileno` as a function, which can be
mocked in unit tests.

On other OSes the patch just creates a thread which is doing nothing.
We avoid adding pre-processor conditionals since the cost is small.

Tested on
FreeBSD 13.1-RELEASE-p6 GENERIC amd64
NetBSD 9.2 (GENERIC) amd64
OpenBSD 7.2 GENERIC#7 amd64
DragonFly v6.4.0-RELEASE x86_64
Ubuntu 22.04.1 x86_64

Change-Id: I3d65c125183e60037ad07b9d54b8fffdece5a4e8
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/74157
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Peter Marheine <pmarheine@chromium.org>
Reviewed-by: Thomas Heijligen <src@posteo.de>
This commit is contained in:
Anastasia Klimchuk 2023-04-01 22:08:52 +11:00
parent 256b041480
commit 7348eb3320
2 changed files with 21 additions and 12 deletions
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4
tests/meson.build
View File

@ -113,6 +113,8 @@ mocks = [
'-Wl,--gc-sections',
]
threads_dep = dependency('threads')
flashrom_tests = executable('flashrom_unit_tests',
test_srcs,
c_args : [
@ -123,7 +125,7 @@ flashrom_tests = executable('flashrom_unit_tests',
],
export_dynamic : true,
link_args : mocks + link_args,
dependencies : [cmocka_dep, flashrom_test_dep],
dependencies : [cmocka_dep, flashrom_test_dep, threads_dep],
)
test('cmocka test flashrom', flashrom_tests)

29
tests/tests.c
View File

@ -22,6 +22,7 @@
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <pthread.h>
void *not_null(void)
{
@ -385,26 +386,32 @@ unsigned int __wrap_INL(unsigned short port)
return 0;
}
static void *doing_nothing(void *vargp) {
return NULL;
}
int main(int argc, char *argv[])
{
int ret = 0;
#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
/*
* Pretending to be a multithreaded environment so that `fileno`
* is called as a function (and not as a macro).
* fileno macro in FreeBSD is expanded into inline access of
* private field of file descriptor, which is impossible to mock.
* Calling fileno as a function allows the test to mock it.
*/
__isthreaded = 1;
#endif
if (argc > 1)
cmocka_set_test_filter(argv[1]);
cmocka_set_message_output(CM_OUTPUT_STDOUT);
/*
* Creating new thread which is doing nothing, to trigger __isthreaded being 1.
* This is a workaround for BSD family. In multi-threaded environment fileno
* macro is expanded into a function which is possible to mock in unit tests.
* Without this workaround, on a single-thread environment, fileno macro is
* expanded into an inline access of a private field of a file descriptor,
* which is impossible to mock.
*
* In other OSes this is just creating a thread which is doing nothing.
*/
pthread_t thread_id;
pthread_create(&thread_id, NULL, doing_nothing, NULL);
const struct CMUnitTest helpers_tests[] = {
cmocka_unit_test(address_to_bits_test_success),
cmocka_unit_test(bitcount_test_success),