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Date: Thu, 15 Oct 2020 00:29:09 -0700
From: Andrei Vagin <avagin@...il.com>
To: Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org
Cc: Ingo Molnar <mingo@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Darren Hart <dvhart@...radead.org>,
Dmitry Safonov <0x7f454c46@...il.com>,
Shuah Khan <shuah@...nel.org>, Andrei Vagin <avagin@...il.com>
Subject: [PATCH 2/2] selftests/timens: Add a test for futex()
Output on success:
$ ./futex
1..1
ok 1 futex
# Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0
Signed-off-by: Andrei Vagin <avagin@...il.com>
---
tools/testing/selftests/timens/Makefile | 2 +-
tools/testing/selftests/timens/futex.c | 107 ++++++++++++++++++++++++
2 files changed, 108 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/timens/futex.c
diff --git a/tools/testing/selftests/timens/Makefile b/tools/testing/selftests/timens/Makefile
index b4fd9a934654..3a5936cc10ab 100644
--- a/tools/testing/selftests/timens/Makefile
+++ b/tools/testing/selftests/timens/Makefile
@@ -1,4 +1,4 @@
-TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs exec
+TEST_GEN_PROGS := timens timerfd timer clock_nanosleep procfs exec futex
TEST_GEN_PROGS_EXTENDED := gettime_perf
CFLAGS := -Wall -Werror -pthread
diff --git a/tools/testing/selftests/timens/futex.c b/tools/testing/selftests/timens/futex.c
new file mode 100644
index 000000000000..173760d3fce6
--- /dev/null
+++ b/tools/testing/selftests/timens/futex.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+#define _GNU_SOURCE
+#include <sched.h>
+
+#include <linux/unistd.h>
+#include <linux/futex.h>
+#include <stdlib.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/syscall.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "log.h"
+#include "timens.h"
+
+#define NSEC_PER_SEC 1000000000ULL
+
+static int run_test(void)
+{
+ struct timespec timeout, end;
+ int val = 0;
+
+ clock_gettime(CLOCK_MONOTONIC, &timeout);
+ timeout.tv_nsec += NSEC_PER_SEC / 10; // 100ms
+ if (timeout.tv_nsec > NSEC_PER_SEC) {
+ timeout.tv_sec++;
+ timeout.tv_nsec -= NSEC_PER_SEC;
+ }
+
+ if (syscall(__NR_futex, &val, FUTEX_WAIT_BITSET, 0,
+ &timeout, 0, FUTEX_BITSET_MATCH_ANY) >= 0) {
+ ksft_test_result_fail("futex didn't return ETIMEDOUT");
+ return 1;
+ }
+
+ if (errno != ETIMEDOUT) {
+ ksft_test_result_fail("futex didn't return ETIMEDOUT: %s",
+ strerror(errno));
+ return 1;
+ }
+
+ clock_gettime(CLOCK_MONOTONIC, &end);
+
+ if (end.tv_sec < timeout.tv_sec ||
+ (end.tv_sec == timeout.tv_sec && end.tv_nsec < timeout.tv_sec)) {
+ ksft_test_result_fail("futex slept less than 100ms");
+ return 1;
+ }
+
+
+ ksft_test_result_pass("futex\n");
+
+ return 0;
+}
+
+int main(int argc, char *argv[])
+{
+ int status, len, fd;
+ char buf[4096];
+ pid_t pid;
+ struct timespec mtime_now;
+
+ nscheck();
+
+ check_supported_timers();
+
+ ksft_set_plan(1);
+
+ clock_gettime(CLOCK_MONOTONIC, &mtime_now);
+
+ if (unshare_timens())
+ return 1;
+
+ len = snprintf(buf, sizeof(buf), "%d %d 0",
+ CLOCK_MONOTONIC, 70 * 24 * 3600);
+ fd = open("/proc/self/timens_offsets", O_WRONLY);
+ if (fd < 0)
+ return pr_perror("/proc/self/timens_offsets");
+
+ if (write(fd, buf, len) != len)
+ return pr_perror("/proc/self/timens_offsets");
+
+ close(fd);
+
+ pid = fork();
+ if (pid < 0)
+ return pr_perror("Unable to fork");
+ if (pid == 0) {
+ if (run_test())
+ ksft_exit_fail();
+ ksft_exit_pass();
+ return 0;
+ }
+
+ if (waitpid(pid, &status, 0) != pid)
+ return pr_perror("Unable to wait the child process");
+
+ if (WIFEXITED(status))
+ return WEXITSTATUS(status);
+
+ return 1;
+}
--
2.26.2
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