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#define _GNU_SOURCE
#include <linux/membarrier.h>
#include <syscall.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "../kselftest.h"
static int sys_membarrier(int cmd, int flags)
{
return syscall(__NR_membarrier, cmd, flags);
}
static int test_membarrier_cmd_fail(void)
{
int cmd = -1, flags = 0;
if (sys_membarrier(cmd, flags) != -1) {
ksft_exit_fail_msg(
"sys membarrier invalid command test: command = %d, flags = %d. Should fail, but passed\n",
cmd, flags);
}
ksft_test_result_pass(
"sys membarrier invalid command test: command = %d, flags = %d. Failed as expected\n",
cmd, flags);
return 0;
}
static int test_membarrier_flags_fail(void)
{
int cmd = MEMBARRIER_CMD_QUERY, flags = 1;
if (sys_membarrier(cmd, flags) != -1) {
ksft_exit_fail_msg(
"sys membarrier MEMBARRIER_CMD_QUERY invalid flags test: flags = %d. Should fail, but passed\n",
flags);
}
ksft_test_result_pass(
"sys membarrier MEMBARRIER_CMD_QUERY invalid flags test: flags = %d. Failed as expected\n",
flags);
return 0;
}
static int test_membarrier_success(void)
{
int cmd = MEMBARRIER_CMD_SHARED, flags = 0;
const char *test_name = "sys membarrier MEMBARRIER_CMD_SHARED\n";
if (sys_membarrier(cmd, flags) != 0) {
ksft_exit_fail_msg(
"sys membarrier MEMBARRIER_CMD_SHARED test: flags = %d\n",
flags);
}
ksft_test_result_pass(
"sys membarrier MEMBARRIER_CMD_SHARED test: flags = %d\n",
flags);
return 0;
}
static int test_membarrier(void)
{
int status;
status = test_membarrier_cmd_fail();
if (status)
return status;
status = test_membarrier_flags_fail();
if (status)
return status;
status = test_membarrier_success();
if (status)
return status;
return 0;
}
static int test_membarrier_query(void)
{
int flags = 0, ret;
ret = sys_membarrier(MEMBARRIER_CMD_QUERY, flags);
if (ret < 0) {
if (errno == ENOSYS) {
/*
* It is valid to build a kernel with
* CONFIG_MEMBARRIER=n. However, this skips the tests.
*/
ksft_exit_skip(
"sys membarrier (CONFIG_MEMBARRIER) is disabled.\n");
}
ksft_exit_fail_msg("sys_membarrier() failed\n");
}
if (!(ret & MEMBARRIER_CMD_SHARED))
ksft_exit_fail_msg("sys_membarrier is not supported.\n");
ksft_test_result_pass("sys_membarrier available\n");
return 0;
}
int main(int argc, char **argv)
{
ksft_print_header();
test_membarrier_query();
test_membarrier();
ksft_exit_pass();
}
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