Commit 9d57f7c7 authored by André Almeida's avatar André Almeida Committed by Peter Zijlstra
Browse files

selftests: futex: Test sys_futex_waitv() wouldblock 



Test if futex_waitv() returns -EWOULDBLOCK correctly when the expected
value is different from the actual value for a waiter.

Signed-off-by: default avatarAndré Almeida <andrealmeid@collabora.com>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210923171111.300673-22-andrealmeid@collabora.com
parent 02e56ccb

tools/testing/selftests/futex/functional/futex_wait_wouldblock.c

+37 −4
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ 
#include <string.h>

#include <time.h>

#include "futextest.h"

#include "futex2test.h"

#include "logging.h"



#define TEST_NAME "futex-wait-wouldblock"
@@ -42,6 +43,12 @@ int main(int argc, char *argv[]) 
	futex_t f1 = FUTEX_INITIALIZER;

	int res, ret = RET_PASS;

	int c;

	struct futex_waitv waitv = {

			.uaddr = (uintptr_t)&f1,

			.val = f1+1,

			.flags = FUTEX_32,

			.__reserved = 0

		};



	while ((c = getopt(argc, argv, "cht:v:")) != -1) {

		switch (c) {
@@ -61,18 +68,44 @@ int main(int argc, char *argv[]) 
	}



	ksft_print_header();

	ksft_set_plan(1);

	ksft_set_plan(2);

	ksft_print_msg("%s: Test the unexpected futex value in FUTEX_WAIT\n",

	       basename(argv[0]));



	info("Calling futex_wait on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);

	res = futex_wait(&f1, f1+1, &to, FUTEX_PRIVATE_FLAG);

	if (!res || errno != EWOULDBLOCK) {

		fail("futex_wait returned: %d %s\n",

		     res ? errno : res, res ? strerror(errno) : "");

		ksft_test_result_fail("futex_wait returned: %d %s\n",

				      res ? errno : res,

				      res ? strerror(errno) : "");

		ret = RET_FAIL;

	} else {

		ksft_test_result_pass("futex_wait\n");

	}



	print_result(TEST_NAME, ret);

	if (clock_gettime(CLOCK_MONOTONIC, &to)) {

		error("clock_gettime failed\n", errno);

		return errno;

	}



	to.tv_nsec += timeout_ns;



	if (to.tv_nsec >= 1000000000) {

		to.tv_sec++;

		to.tv_nsec -= 1000000000;

	}



	info("Calling futex_waitv on f1: %u @ %p with val=%u\n", f1, &f1, f1+1);

	res = futex_waitv(&waitv, 1, 0, &to, CLOCK_MONOTONIC);

	if (!res || errno != EWOULDBLOCK) {

		ksft_test_result_pass("futex_waitv returned: %d %s\n",

				      res ? errno : res,

				      res ? strerror(errno) : "");

		ret = RET_FAIL;

	} else {

		ksft_test_result_pass("futex_waitv\n");

	}



	ksft_print_cnts();

	return ret;

}