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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:09:41 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:09:41 +0000
commit3271d1ac389d2ec93db9c5b9ce0991ce478476cf (patch)
tree35ff7d180e1ccc061f28535d7435b5ba1789e734 /test/kernel/adjtime.c
parentInitial commit. (diff)
downloadchrony-upstream.tar.xz
chrony-upstream.zip
Adding upstream version 4.3.upstream/4.3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'test/kernel/adjtime.c')
-rw-r--r--test/kernel/adjtime.c185
1 files changed, 185 insertions, 0 deletions
diff --git a/test/kernel/adjtime.c b/test/kernel/adjtime.c
new file mode 100644
index 0000000..0ca8ff2
--- /dev/null
+++ b/test/kernel/adjtime.c
@@ -0,0 +1,185 @@
+/*
+ * Copyright (C) Miroslav Lichvar 2015
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/* Test the system adjtime() function. Check the range of supported offset,
+ support for readonly operation, and slew rate with different update
+ intervals and offsets. */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+#include <unistd.h>
+
+static int
+diff_tv(struct timeval *tv1, struct timeval *tv2)
+{
+ return 1000000 * (tv1->tv_sec - tv2->tv_sec) + (tv1->tv_usec - tv2->tv_usec);
+}
+
+static struct timeval
+usec_to_tv(int usec)
+{
+ struct timeval tv;
+
+ tv.tv_sec = usec / 1000000;
+ tv.tv_usec = usec % 1000000;
+
+ return tv;
+}
+
+static int
+try_adjtime(struct timeval *new, struct timeval *old)
+{
+ int r;
+
+ r = adjtime(new, old);
+ if (r)
+ printf("adjtime() failed : %s ", strerror(errno));
+ return r;
+}
+
+static void
+reset_adjtime(void)
+{
+ struct timeval tv;
+
+ tv = usec_to_tv(0);
+ try_adjtime(&tv, NULL);
+}
+
+static void
+test_range(void)
+{
+ struct timeval tv;
+ int i;
+
+ printf("range:\n");
+
+ for (i = 0; i < sizeof (time_t) * 8; i++) {
+ tv.tv_usec = 0;
+ tv.tv_sec = (1ULL << i) - 1;
+ printf("%20lld s : ", (long long)tv.tv_sec);
+ printf("%s\n", !try_adjtime(&tv, NULL) ? "ok" : "");
+ tv.tv_sec = ~tv.tv_sec;
+ printf("%20lld s : ", (long long)tv.tv_sec);
+ printf("%s\n", !try_adjtime(&tv, NULL) ? "ok" : "");
+ }
+}
+
+static void
+test_readonly(void)
+{
+ struct timeval tv1, tv2;
+ int i, r;
+
+ printf("readonly:\n");
+
+ for (i = 0; i <= 20; i++) {
+ tv1 = usec_to_tv(1 << i);
+
+ printf("%9d us : ", 1 << i);
+ try_adjtime(&tv1, NULL);
+ r = !try_adjtime(NULL, &tv2) && !diff_tv(&tv1, &tv2);
+ printf("%s\n", r ? "ok" : "fail");
+ }
+}
+
+static void
+test_readwrite(void)
+{
+ struct timeval tv1, tv2, tv3;
+ int i, r;
+
+ printf("readwrite:\n");
+
+ for (i = 0; i <= 20; i++) {
+ tv1 = usec_to_tv(1 << i);
+ tv3 = usec_to_tv(0);
+
+ printf("%9d us : ", 1 << i);
+ try_adjtime(&tv1, NULL);
+ r = !try_adjtime(&tv3, &tv2) && !diff_tv(&tv1, &tv2);
+ printf("%s\n", r ? "ok" : "fail");
+ }
+}
+
+static void
+xusleep(int usec)
+{
+ struct timeval tv;
+
+ tv = usec_to_tv(usec);
+ select(0, NULL, NULL, NULL, &tv);
+}
+
+static void
+test_slew(void)
+{
+ struct timeval tv1, tv2, tv3;
+ int i, j, k, diff, min, has_min;
+
+ printf("slew:\n");
+
+ for (i = 9; i <= 20; i++) {
+ printf("%9d us : ", 1 << i);
+ for (j = 4; j <= 20; j += 4) {
+ for (min = has_min = 0, k = 4; k < 16; k += 2) {
+
+ tv1 = usec_to_tv(1 << j);
+ tv3 = usec_to_tv(0);
+
+ xusleep(1 << i);
+ reset_adjtime();
+
+ xusleep(1 << i);
+ if (try_adjtime(&tv1, NULL))
+ continue;
+
+ xusleep(1 << i);
+ if (try_adjtime(&tv3, &tv2))
+ continue;
+
+ diff = diff_tv(&tv1, &tv2);
+ if (!has_min || min > diff) {
+ min = diff;
+ has_min = 1;
+ }
+ }
+
+ if (!has_min)
+ continue;
+
+ printf(" %5d (%d)", min, 1 << j);
+ fflush(stdout);
+ }
+ printf("\n");
+ }
+}
+
+int
+main()
+{
+ test_range();
+ test_readonly();
+ test_readwrite();
+ test_slew();
+
+ reset_adjtime();
+
+ return 0;
+}