[LTP] [PATCH v2 9/9] syscalls/timerfd04: Add time namespace test

Cyril Hrubis
2020-03-18T15:38:01Z

runtest/containers | 1 +
runtest/syscalls | 1 +
testcases/kernel/syscalls/timerfd/.gitignore | 1 +
testcases/kernel/syscalls/timerfd/timerfd04.c | 98 +++++++++++++++++++
4 files changed, 101 insertions(+)
create mode 100644 testcases/kernel/syscalls/timerfd/timerfd04.c

diff --git a/runtest/containers b/runtest/containers
index 23e4a533d..276096709 100644
--- a/runtest/containers
+++ b/runtest/containers
@@ -91,3 +91,4 @@ sysinfo03 sysinfo03
clock_nanosleep03 clock_nanosleep03
clock_gettime03 clock_gettime03
timens01 timens01
+timerfd04 timerfd04
diff --git a/runtest/syscalls b/runtest/syscalls
index 4949b5d36..16ed8d8ec 100644
--- a/runtest/syscalls
+++ b/runtest/syscalls
@@ -1497,6 +1497,7 @@ times03 times03
timerfd01 timerfd01
timerfd02 timerfd02
timerfd03 timerfd03
+timerfd04 timerfd04
timerfd_create01 timerfd_create01
timerfd_gettime01 timerfd_gettime01
timerfd_settime01 timerfd_settime01
diff --git a/testcases/kernel/syscalls/timerfd/.gitignore b/testcases/kernel/syscalls/timerfd/.gitignore
index 1c5329966..ef388685d 100644
--- a/testcases/kernel/syscalls/timerfd/.gitignore
+++ b/testcases/kernel/syscalls/timerfd/.gitignore
@@ -1,6 +1,7 @@
/timerfd01
/timerfd02
/timerfd03
+/timerfd04
/timerfd_create01
/timerfd_gettime01
/timerfd_settime01
diff --git a/testcases/kernel/syscalls/timerfd/timerfd04.c b/testcases/kernel/syscalls/timerfd/timerfd04.c
new file mode 100644
index 000000000..28f9e4e02
--- /dev/null
+++ b/testcases/kernel/syscalls/timerfd/timerfd04.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+
+ Copyright (c) 2020 Cyril Hrubis <chrubis@suse.cz>
+
+ */
+/*
+
+ Test that timerfd adds correctly an offset with absolute expiration time.
+
+ After a call to unshare(CLONE_NEWTIME) a new timer namespace is created, the
+ process that has called the unshare() can adjust offsets for CLOCK_MONOTONIC
+ and CLOCK_BOOTTIME for its children by writing to the '/proc/self/timens_offsets'.
+
+ */
+
+#include <stdlib.h>
+#include "tst_safe_clocks.h"
+#include "tst_safe_timerfd.h"
+#include "tst_timer.h"
+#include "lapi/namespaces_constants.h"
+#include "tst_test.h"
+
+#define SLEEP_US 40000
+
+static struct tcase {
+ int clk_id;
+ int clk_off;
+ int off;
+} tcases[] = {
+ {CLOCK_MONOTONIC, CLOCK_MONOTONIC, 10},
+ {CLOCK_BOOTTIME, CLOCK_BOOTTIME, 10},
+
+ {CLOCK_MONOTONIC, CLOCK_MONOTONIC, -10},
+ {CLOCK_BOOTTIME, CLOCK_BOOTTIME, -10},
+};
+
+static void verify_timerfd(unsigned int n)
+{
+ struct timespec start, end;
+ struct itimerspec it = {};
+ struct tcase *tc = &tcases[n];
+
+ SAFE_UNSHARE(CLONE_NEWTIME);
+
+ SAFE_FILE_PRINTF("/proc/self/timens_offsets", "%d %d 0",
+ tc->clk_off, tc->off);
+
+ SAFE_CLOCK_GETTIME(tc->clk_id, &start);
+
+ it.it_value = tst_timespec_add_us(start, 1000000 * tc->off + SLEEP_US);
+
+ if (!SAFE_FORK()) {
+ uint64_t exp;
+ int fd = SAFE_TIMERFD_CREATE(tc->clk_id, 0);
+
+ SAFE_TIMERFD_SETTIME(fd, TFD_TIMER_ABSTIME, &it, NULL);
+
+ SAFE_READ(1, fd, &exp, sizeof(exp));
+
+ if (exp != 1)
+ tst_res(TFAIL, "Got %llu expirations", (long long unsigned)exp);
+
+ SAFE_CLOSE(fd);
+ exit(0);
+ }
+
+ SAFE_WAIT(NULL);
+
+ SAFE_CLOCK_GETTIME(CLOCK_MONOTONIC, &end);
+
+ long long diff = tst_timespec_diff_us(end, start);
+
+ if (diff > 5 * SLEEP_US) {
+ tst_res(TFAIL, "timerfd %s slept too long %lli",
+ tst_clock_name(tc->clk_id), diff);
+ return;
+ }
+
+ if (diff < SLEEP_US) {
+ tst_res(TFAIL, "timerfd %s slept too short %lli",
+ tst_clock_name(tc->clk_id), diff);
+ return;
+ }
+
+ tst_res(TPASS, "timerfd %s slept correctly %lli",
+ tst_clock_name(tc->clk_id), diff);
+}
+
+static struct tst_test test = {
+ .tcnt = ARRAY_SIZE(tcases),
+ .test = verify_timerfd,
+ .needs_root = 1,
+ .forks_child = 1,
+ .needs_kconfigs = (const char *[]) {
+ "CONFIG_TIME_NS=y"
+ }
+};
--
2.24.1