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/*
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file is distributed
* on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
* express or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#include "utils/s2n_io.h"
#include <sys/wait.h>
#include "s2n_test.h"
#include "tests/testlib/s2n_testlib.h"
#define S2N_TEST_SIGNAL SIGUSR1
#define S2N_TEST_SUCCESS 123
static int s2n_test_mocked_interrupt(uint8_t n_times, uint8_t *counter)
{
if (*counter < n_times) {
(*counter)++;
errno = EINTR;
return -1;
}
return S2N_TEST_SUCCESS;
}
static int s2n_test_real_interrupt(int fd, uint8_t n_times, uint8_t *counter)
{
if (*counter < n_times) {
(*counter)++;
/* There is no data being written to fd,
* so this will block indefinitely unless interrupted.
*/
uint8_t buffer = 0;
int r = read(fd, &buffer, 1);
EXPECT_TRUE(r < 0);
EXPECT_EQUAL(errno, EINTR);
return r;
}
return S2N_TEST_SUCCESS;
}
static void s2n_test_sig_handler(int signum)
{
EXPECT_EQUAL(signum, S2N_TEST_SIGNAL);
}
static int s2n_fail_without_errno(uint8_t *counter)
{
(*counter)++;
if (*counter > 10) {
/* To avoid an infinite loop on test case failure, eventually return success */
return 0;
}
return -1;
}
int main(int argc, char **argv)
{
BEGIN_TEST();
/* Test S2N_IO_RETRY_EINTR */
{
const uint8_t n_times = 5;
/* Retries on errno == EINTR */
{
uint8_t counter = 0;
int result = 0;
S2N_IO_RETRY_EINTR(result, s2n_test_mocked_interrupt(n_times, &counter));
EXPECT_EQUAL(result, S2N_TEST_SUCCESS);
EXPECT_EQUAL(counter, n_times);
};
/* Retries on real interrupt */
{
DEFER_CLEANUP(struct s2n_test_io_pair io_pair = { 0 }, s2n_io_pair_close);
EXPECT_SUCCESS(s2n_io_pair_init(&io_pair));
struct sigaction action = {
.sa_handler = s2n_test_sig_handler,
};
sigaction(SIGUSR1, &action, NULL);
fflush(stdout);
pid_t pid = fork();
if (pid == 0) {
uint8_t counter = 0;
int result = 0;
S2N_IO_RETRY_EINTR(result,
s2n_test_real_interrupt(io_pair.client, n_times, &counter));
EXPECT_EQUAL(result, S2N_TEST_SUCCESS);
EXPECT_EQUAL(counter, n_times);
exit(0);
}
/* Keep sending the signal until the process exits */
int status = 0;
while (waitpid(pid, &status, WNOHANG) == 0) {
EXPECT_EQUAL(kill(pid, S2N_TEST_SIGNAL), 0);
}
EXPECT_EQUAL(status, EXIT_SUCCESS);
};
/* Handles IO methods that don't properly set errno */
{
/* Set errno to EINTR to try to trigger retry */
errno = EINTR;
uint8_t counter = 0;
int result = 0;
S2N_IO_RETRY_EINTR(result, s2n_fail_without_errno(&counter));
EXPECT_EQUAL(result, -1);
EXPECT_EQUAL(counter, 1);
EXPECT_EQUAL(errno, 0);
};
};
END_TEST();
}
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