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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2022 ARM Limited.
* Original author: Mark Brown <broonie@kernel.org>
*/
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/sched.h>
#include <linux/wait.h>
#include "kselftest.h"
#define EXPECTED_TESTS 1
int fork_test(void);
int verify_fork(void);
/*
* If we fork the value in the parent should be unchanged and the
* child should start with the same value. This is called from the
* fork_test() asm function.
*/
int fork_test_c(void)
{
pid_t newpid, waiting;
int child_status, parent_result;
newpid = fork();
if (newpid == 0) {
/* In child */
if (!verify_fork()) {
ksft_print_msg("ZA state invalid in child\n");
exit(0);
} else {
exit(1);
}
}
if (newpid < 0) {
ksft_print_msg("fork() failed: %d\n", newpid);
return 0;
}
parent_result = verify_fork();
if (!parent_result)
ksft_print_msg("ZA state invalid in parent\n");
for (;;) {
waiting = waitpid(newpid, &child_status, 0);
if (waiting < 0) {
if (errno == EINTR)
continue;
ksft_print_msg("waitpid() failed: %d\n", errno);
return 0;
}
if (waiting != newpid) {
ksft_print_msg("waitpid() returned wrong PID\n");
return 0;
}
if (!WIFEXITED(child_status)) {
ksft_print_msg("child did not exit\n");
return 0;
}
return WEXITSTATUS(child_status) && parent_result;
}
}
int main(int argc, char **argv)
{
int ret, i;
ksft_print_header();
ksft_set_plan(EXPECTED_TESTS);
ksft_print_msg("PID: %d\n", getpid());
/*
* This test is run with nolibc which doesn't support hwcap and
* it's probably disproportionate to implement so instead check
* for the default vector length configuration in /proc.
*/
ret = open("/proc/sys/abi/sme_default_vector_length", O_RDONLY, 0);
if (ret >= 0) {
ksft_test_result(fork_test(), "fork_test\n");
} else {
ksft_print_msg("SME not supported\n");
for (i = 0; i < EXPECTED_TESTS; i++) {
ksft_test_result_skip("fork_test\n");
}
}
ksft_finished();
return 0;
}
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