mbedtls/tests/suites/test_suite_platform.function

/* BEGIN_HEADER */

/* This test module exercises the platform_* module. Since, depending on the
 * underlying operating system, the time routines are not always reliable,
 * this suite only performs very basic sanity checks of the timing API.
 */

#include <limits.h>

#if defined(MBEDTLS_HAVE_TIME)
#include "mbedtls/platform_time.h"

#ifdef WIN32
#include <windows.h>
#elif _POSIX_C_SOURCE >= 199309L
#include <time.h>
#else
#include <unistd.h>
#endif
void sleep_ms(int milliseconds)
{
#ifdef WIN32
    Sleep(milliseconds);
#elif _POSIX_C_SOURCE >= 199309L
    struct timespec ts;
    ts.tv_sec = milliseconds / 1000;
    ts.tv_nsec = (milliseconds % 1000) * 1000000;
    nanosleep(&ts, NULL);
#else
    usleep(milliseconds * 1000);
#endif
}
#endif

/* END_HEADER */

/* BEGIN_DEPENDENCIES */

/* END_DEPENDENCIES */

/* BEGIN_CASE depends_on:MBEDTLS_HAVE_TIME */
void time_get_milliseconds()
{
    mbedtls_ms_time_t current = mbedtls_ms_time();
    (void) current;
    /* This goto is added to avoid warnings from the generated code. */
    goto exit;
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_HAVE_TIME */
void time_get_seconds()
{
    mbedtls_time_t current = mbedtls_time(NULL);
    (void) current;
    /* This goto is added to avoid warnings from the generated code. */
    goto exit;
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_HAVE_TIME */
void time_delay_milliseconds(int delay_ms)
{
    mbedtls_ms_time_t current = mbedtls_ms_time();
    mbedtls_ms_time_t elapsed_ms;

    sleep_ms(delay_ms);

    elapsed_ms = mbedtls_ms_time() - current;
    TEST_ASSERT(elapsed_ms >= delay_ms && elapsed_ms < 4000 + delay_ms);
    /* This goto is added to avoid warnings from the generated code. */
    goto exit;
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_HAVE_TIME */

/*
 * WARNING: DONOT ENABLE THIS TEST. RESERVE IT HERE TO KEEP THE REASON.
 *
 *          The test often failed on the CI. See #1517. CI failures cannot be
 *          completely avoided due to out-of-sync clock sources.
 */
void time_delay_seconds(int delay_secs)
{
    mbedtls_time_t current = mbedtls_time(NULL);
    mbedtls_time_t elapsed_secs;

    sleep_ms(delay_secs * 1000);

    elapsed_secs = mbedtls_time(NULL) - current;

    /*
     * `mbedtls_time` was defined as c99 function `time`, it uses
     * CLOCK_REALTIME and returns the number of seconds since the Epoch. And
     * `nanosleep` uses CLOCK_MONOTONIC. The time sources are out of sync.
     *
     * If CLOCK_MONOTONIC is faster than CLOCK_REALTIME and `nanosleep` exits at
     * the end of a second, `elapsed_secs` will be less than `delay_secs`.
     *
     * Workaround it with 1 second tolerance.
     */
    TEST_ASSERT(elapsed_secs >= delay_secs - 1);
    /* If CLOCK_MONOTONIC is slower than CLOCK_REALTIME or nanosleep does not
     * exit on time.
     */
    TEST_ASSERT(elapsed_secs < 4 + delay_secs);
    /* This goto is added to avoid warnings from the generated code. */
    goto exit;
}
/* END_CASE */