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Subject[RFC 17/20] selftest/timens: Add test for timerfd
Date
From: Andrei Vagin <avagin@gmail.com>

Check that timerfd_create takes into account clock offsets.

Cc: linux-kselftest@vger.kernel.org
Signed-off-by: Andrei Vagin <avagin@openvz.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
tools/testing/selftests/timens/.gitignore | 1 +
tools/testing/selftests/timens/Makefile | 2 +-
tools/testing/selftests/timens/timerfd.c | 96 +++++++++++++++++++++++++++++++
3 files changed, 98 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timens/timerfd.c

diff --git a/tools/testing/selftests/timens/.gitignore b/tools/testing/selftests/timens/.gitignore
index 27a693229ce1..b609f6ee9fb9 100644
--- a/tools/testing/selftests/timens/.gitignore
+++ b/tools/testing/selftests/timens/.gitignore
@@ -1 +1,2 @@
timens
+timerfd
diff --git a/tools/testing/selftests/timens/Makefile b/tools/testing/selftests/timens/Makefile
index b877efb78974..66b90cd28e5c 100644
--- a/tools/testing/selftests/timens/Makefile
+++ b/tools/testing/selftests/timens/Makefile
@@ -1,4 +1,4 @@
-TEST_GEN_PROGS := timens
+TEST_GEN_PROGS := timens timerfd

CFLAGS := -Wall -Werror

diff --git a/tools/testing/selftests/timens/timerfd.c b/tools/testing/selftests/timens/timerfd.c
new file mode 100644
index 000000000000..914a4cd9a0df
--- /dev/null
+++ b/tools/testing/selftests/timens/timerfd.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <sched.h>
+
+#include <sys/timerfd.h>
+#include <sys/syscall.h>
+#include <time.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+
+#include "log.h"
+
+#ifndef CLONE_NEWTIME
+# define CLONE_NEWTIME 0x00001000
+#endif
+
+int run_test(int clockid)
+{
+ struct itimerspec new_value;
+ struct timespec now;
+ long long elapsed;
+ int fd, i;
+
+ if (clock_gettime(clockid, &now))
+ return pr_perror("clock_gettime");
+
+ for (i = 0; i < 2; i++) {
+ int flags = 0;
+
+ pr_msg("timerfd_settime: %d", "INFO", clockid);
+ new_value.it_value.tv_sec = 3600;
+ new_value.it_value.tv_nsec = 0;
+ new_value.it_interval.tv_sec = 1;
+ new_value.it_interval.tv_nsec = 0;
+
+ if (i == 1) {
+ new_value.it_value.tv_sec += now.tv_sec;
+ new_value.it_value.tv_nsec += now.tv_nsec;
+ }
+
+ fd = timerfd_create(clockid, 0);
+ if (fd == -1)
+ return pr_perror("timerfd_create");
+
+ if (i == 1)
+ flags |= TFD_TIMER_ABSTIME;
+
+ if (timerfd_settime(fd, flags, &new_value, NULL))
+ return pr_perror("timerfd_settime");
+
+ if (timerfd_gettime(fd, &new_value))
+ return pr_perror("timerfd_gettime");
+
+ elapsed = new_value.it_value.tv_sec;
+ if (abs(elapsed - 3600) > 60) {
+ printf("FAIL\n");
+ return 1;
+ }
+
+ close(fd);
+ }
+
+ printf("PASS\n");
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ struct timespec tp;
+ int ret;
+
+ if (unshare(CLONE_NEWTIME))
+ return pr_perror("unshare");
+
+ if (clock_gettime(CLOCK_MONOTONIC, &tp))
+ return pr_perror("clock_gettime");
+ tp.tv_sec = 7 * 24 * 3600;
+ if (clock_settime(CLOCK_MONOTONIC, &tp))
+ return pr_perror("clock_settime");
+
+ if (clock_gettime(CLOCK_BOOTTIME, &tp))
+ return pr_perror("clock_gettime");
+ tp.tv_sec += 9 * 24 * 3600;
+ tp.tv_nsec = 0;
+ if (clock_settime(CLOCK_BOOTTIME, &tp))
+ return pr_perror("clock_settime");
+
+ ret = 0;
+ ret |= run_test(CLOCK_BOOTTIME);
+ ret |= run_test(CLOCK_MONOTONIC);
+ return ret;
+}
+
--
2.13.6
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