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Date: Sun, 5 May 2024 22:46:48 +0800
From: Wen Yang <wen.yang@...ux.dev>
To: Shuah Khan <skhan@...uxfoundation.org>,
Christian Brauner <brauner@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: Wen Yang <wen.yang@...ux.dev>,
SShuah Khan <shuah@...nel.org>,
Andrei Vagin <avagin@...gle.com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Steven Rostedt <rostedt@...dmis.org>,
Dave Young <dyoung@...hat.com>,
linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH] selftests: introduce additional eventfd test coverage
Add several new test cases which assert corner cases on the eventfd
mechanism, for example, the supplied buffer is less than 8 bytes,
attempting to write a value that is too large, etc.
./eventfd_test
# Starting 9 tests from 1 test cases.
# RUN global.eventfd01 ...
# OK global.eventfd01
ok 1 global.eventfd01
# RUN global.eventfd02 ...
# OK global.eventfd02
ok 2 global.eventfd02
# RUN global.eventfd03 ...
# OK global.eventfd03
ok 3 global.eventfd03
# RUN global.eventfd04 ...
# OK global.eventfd04
ok 4 global.eventfd04
# RUN global.eventfd05 ...
# OK global.eventfd05
ok 5 global.eventfd05
# RUN global.eventfd06 ...
# OK global.eventfd06
ok 6 global.eventfd06
# RUN global.eventfd07 ...
# OK global.eventfd07
ok 7 global.eventfd07
# RUN global.eventfd08 ...
# OK global.eventfd08
ok 8 global.eventfd08
# RUN global.eventfd09 ...
# OK global.eventfd09
ok 9 global.eventfd09
# PASSED: 9 / 9 tests passed.
# Totals: pass:9 fail:0 xfail:0 xpass:0 skip:0 error:0
Signed-off-by: Wen Yang <wen.yang@...ux.dev>
Cc: SShuah Khan <shuah@...nel.org>
Cc: Christian Brauner <brauner@...nel.org>
Cc: Andrei Vagin <avagin@...gle.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Dave Young <dyoung@...hat.com>
Cc: linux-kselftest@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
.../filesystems/eventfd/eventfd_test.c | 116 ++++++++++++++++++
1 file changed, 116 insertions(+)
diff --git a/tools/testing/selftests/filesystems/eventfd/eventfd_test.c b/tools/testing/selftests/filesystems/eventfd/eventfd_test.c
index f142a137526c..eeab8df5b1b5 100644
--- a/tools/testing/selftests/filesystems/eventfd/eventfd_test.c
+++ b/tools/testing/selftests/filesystems/eventfd/eventfd_test.c
@@ -183,4 +183,120 @@ TEST(eventfd05)
close(fd);
}
+/*
+ * A write(2) fails with the error EINVAL if the size of the supplied buffer
+ * is less than 8 bytes, or if an attempt is made to write the value
+ * 0xffffffffffffffff.
+ */
+TEST(eventfd06)
+{
+ uint64_t value = 1;
+ ssize_t size;
+ int fd;
+
+ fd = sys_eventfd2(0, 0);
+ ASSERT_GE(fd, 0);
+
+ size = write(fd, &value, sizeof(int));
+ EXPECT_EQ(size, -1);
+ EXPECT_EQ(errno, EINVAL);
+
+ value = (uint64_t)-1;
+ size = write(fd, &value, sizeof(value));
+ EXPECT_EQ(size, -1);
+ EXPECT_EQ(errno, EINVAL);
+
+ close(fd);
+}
+
+/*
+ * A read(2) fails with the error EINVAL if the size of the supplied buffer is
+ * less than 8 bytes.
+ */
+TEST(eventfd07)
+{
+ int value = 0;
+ ssize_t size;
+ int fd;
+
+ fd = sys_eventfd2(0, 0);
+ ASSERT_GE(fd, 0);
+
+ size = write(fd, &value, sizeof(value));
+ EXPECT_EQ(size, -1);
+ EXPECT_EQ(errno, EINVAL);
+
+ close(fd);
+}
+
+/*
+ * If EFD_SEMAPHORE was not specified and the eventfd counter has a nonzero
+ * value, then a read(2) returns 8 bytes containing that value, and the
+ * counter's value is reset to zero.
+ * If the eventfd counter is zero at the time of the call to read(2), then the
+ * call fails with the error EAGAIN if the file descriptor has been made nonblocking.
+ */
+TEST(eventfd08)
+{
+ uint64_t value;
+ ssize_t size;
+ int fd;
+ int i;
+
+ fd = sys_eventfd2(0, EFD_NONBLOCK);
+ ASSERT_GE(fd, 0);
+
+ value = 1;
+ for (i = 0; i < 10000000; i++) {
+ size = write(fd, &value, sizeof(value));
+ EXPECT_EQ(size, sizeof(value));
+ }
+
+ size = read(fd, &value, sizeof(value));
+ EXPECT_EQ(size, sizeof(uint64_t));
+ EXPECT_EQ(value, 10000000);
+
+ size = read(fd, &value, sizeof(value));
+ EXPECT_EQ(size, -1);
+ EXPECT_EQ(errno, EAGAIN);
+
+ close(fd);
+}
+
+/*
+ * If EFD_SEMAPHORE was specified and the eventfd counter has a nonzero value,
+ * then a read(2) returns 8 bytes containing the value 1, and the counter's
+ * value is decremented by 1.
+ * If the eventfd counter is zero at the time of the call to read(2), then the
+ * call fails with the error EAGAIN if the file descriptor has been made nonblocking.
+ */
+TEST(eventfd09)
+{
+ uint64_t value;
+ ssize_t size;
+ int fd;
+ int i;
+
+ fd = sys_eventfd2(0, EFD_SEMAPHORE|EFD_NONBLOCK);
+ ASSERT_GE(fd, 0);
+
+ value = 1;
+ for (i = 0; i < 10000000; i++) {
+ size = write(fd, &value, sizeof(value));
+ EXPECT_EQ(size, sizeof(value));
+ }
+
+ for (i = 0; i < 10000000; i++) {
+ size = read(fd, &value, sizeof(value));
+ EXPECT_EQ(size, sizeof(value));
+ EXPECT_EQ(value, 1);
+ }
+
+ size = read(fd, &value, sizeof(value));
+ EXPECT_EQ(size, -1);
+ EXPECT_EQ(errno, EAGAIN);
+
+ close(fd);
+}
+
TEST_HARNESS_MAIN
--
2.25.1
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