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/*
test_clock.c - tests for finding usable system clocks
This file is part of the nss-pam-ldapd library.
Copyright (C) 2013-2015 Arthur de Jong
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
#include "config.h"
#include <stdio.h>
#include <assert.h>
#include <time.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include "compat/attrs.h"
/* use clock_gettime() to see if the specified clock is supported */
static int test_clock_gettime(clockid_t c, const char *cname)
{
struct timespec t1 = {0, 0};
struct timespec t2 = {0, 0};
struct timespec t3 = {0, 50 * 1000 * 1000}; /* 50 msec */
struct timespec t4 = {0, 0};
long diff;
int result = 0;
/* see if we can get resolution (not important so ignore any failures) */
errno = 0;
if (clock_getres(c, &t1))
printf(" clock %s resolution not supported: %s\n", cname, strerror(errno));
if ((t1.tv_sec != 0) || (t1.tv_nsec != 0))
printf(" clock %s resolution: %ld.%09ld\n", cname, (long)t1.tv_sec, (long)t1.tv_nsec);
/* see if we can get the time */
errno = 0;
if (clock_gettime(c, &t2))
{
printf("FAIL clock %s get time not supported: %s\n",
cname, strerror(errno));
if ((t2.tv_sec != 0) || (t2.tv_nsec != 0))
printf(" clock %s time: %ld.%09ld\n", cname, (long)t2.tv_sec, (long)t2.tv_nsec);
return -1;
}
else
printf("OK clock %s time: %ld.%09ld\n", cname, (long)t2.tv_sec, (long)t2.tv_nsec);
/* quick sleep (assume we're not interrupted) */
(void)nanosleep(&t3, NULL);
/* see if we can get the time again */
errno = 0;
if (clock_gettime(c, &t4))
{
printf("FAIL clock %s get time twice not supported: %s\n",
cname, strerror(errno));
if ((t4.tv_sec != 0) || (t4.tv_nsec != 0))
printf(" clock %s time: %ld.%09ld\n", cname, (long)t4.tv_sec, (long)t4.tv_nsec);
return -1;
}
else
printf("OK clock %s time: %ld.%09ld\n", cname, (long)t4.tv_sec, (long)t4.tv_nsec);
/* calculate difference */
diff = ((long)t4.tv_sec - (long)t2.tv_sec - (long)t3.tv_sec) * 1000000000L +
((long)t4.tv_nsec - (long)t2.tv_nsec - (long)t3.tv_nsec);
if ((diff < (-10 * 1000 * 1000)) || (diff > (20 * 1000 * 1000)))
{
result = -1;
printf("FAIL ");
}
else
printf("OK ");
printf("clock %s time diff: %s%ld.%09ld %.1f%%\n", cname, (diff < 0) ? "-" : "",
(labs(diff) / 1000000000L), (labs(diff) % 1000000000L),
(float)labs(diff) / (float)((long)t3.tv_sec * 10000000L + (long)t3.tv_nsec / 100));
return result;
}
/* wrapper for test_clock_gettime() that passes the clock name */
#define TEST_CLOCK_GETTIME(clock) test_clock_gettime(clock, #clock)
int main(int UNUSED(argc), char UNUSED(*argv[]))
{
int found_clocks = 0;
#ifdef CLOCK_MONOTONIC_RAW
if (!TEST_CLOCK_GETTIME(CLOCK_MONOTONIC_RAW))
found_clocks++;
#endif
#ifdef CLOCK_MONOTONIC_FAST
if (!TEST_CLOCK_GETTIME(CLOCK_MONOTONIC_FAST))
found_clocks++;
#endif
#ifdef CLOCK_MONOTONIC_COARSE
if (!TEST_CLOCK_GETTIME(CLOCK_MONOTONIC_COARSE))
found_clocks++;
#endif
#ifdef CLOCK_MONOTONIC
if (!TEST_CLOCK_GETTIME(CLOCK_MONOTONIC))
found_clocks++;
#endif
#ifdef CLOCK_UPTIME_FAST
if (!TEST_CLOCK_GETTIME(CLOCK_UPTIME_FAST))
found_clocks++;
#endif
#ifdef CLOCK_UPTIME
if (!TEST_CLOCK_GETTIME(CLOCK_UPTIME))
found_clocks++;
#endif
#ifdef CLOCK_BOOTTIME
if (!TEST_CLOCK_GETTIME(CLOCK_BOOTTIME))
found_clocks++;
#endif
#ifdef CLOCK_MONOTONIC_PRECISE
if (!TEST_CLOCK_GETTIME(CLOCK_MONOTONIC_PRECISE))
found_clocks++;
#endif
#ifdef CLOCK_UPTIME_PRECISE
if (!TEST_CLOCK_GETTIME(CLOCK_UPTIME_PRECISE))
found_clocks++;
#endif
#ifdef CLOCK_HIGHRES
#if CLOCK_HIGHRES == CLOCK_MONOTONIC
printf(" CLOCK_HIGHRES == CLOCK_MONOTONIC\n");
#else
/* for Solaris, should be similar to CLOCK_MONOTONIC (it may be an alias) */
if (!TEST_CLOCK_GETTIME(CLOCK_HIGHRES))
found_clocks++;
#endif
#endif
#ifdef CLOCK_REALTIME_FAST
if (!TEST_CLOCK_GETTIME(CLOCK_REALTIME_FAST))
found_clocks++;
#endif
#ifdef CLOCK_REALTIME_COARSE
if (!TEST_CLOCK_GETTIME(CLOCK_REALTIME_COARSE))
found_clocks++;
#endif
if (!TEST_CLOCK_GETTIME(CLOCK_REALTIME))
found_clocks++;
#ifdef CLOCK_REALTIME_PRECISE
if (!TEST_CLOCK_GETTIME(CLOCK_REALTIME_PRECISE))
found_clocks++;
#endif
printf("%d usable clocks found\n", found_clocks);
return !(found_clocks > 0);
}
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