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@xxxxxxxxx> Cc: SShuah Khan <shuah@xxxxxxxxxx> Cc: Christian Brauner <brauner@xxxxxxxxxx> Cc: Andrei Vagin <avagin@xxxxxxxxxx> Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Dave Young <dyoung@xxxxxxxxxx> Cc: linux-kselftest@xxxxxxxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx --- .../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