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| author | Oleg Nesterov <oleg@redhat.com> | 2026-07-29 13:33:45 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2026-08-13 12:19:27 +0200 |
| commit | ab018b7733bd8f5f998d476528c24924ebeb9959 (patch) | |
| tree | 13a75b73fa4ddf3b44ec814a61048632d5bcbe04 /tools/testing | |
| parent | f1cebdec9739911cf066e6ce2e02c511f0d124d5 (diff) | |
| download | linux-ab018b7733bd8f5f998d476528c24924ebeb9959.tar.gz linux-ab018b7733bd8f5f998d476528c24924ebeb9959.zip | |
selftests/epoll: add a regression test for pipe->poll_usage
pipe->poll_usage was added to ensure that edge-triggered epoll consumers
get a wakeup on every write, even if the pipe was already non-empty.
However, none of the existing epoll_wakeup_test cases cover this; the
test suite passes even with WRITE_ONCE(pipe->poll_usage, true) removed.
Add a test that writes twice to a pipe and verifies that epoll_wait with
EPOLLET reports data each time. This covers the pipe-specific per-write
wakeup behavior that edge-triggered consumers depend on.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Link: https://patch.msgid.link/amnlGZesXu-SUK2H@redhat.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c b/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c index f6f1a7ff01b0..81a994943e12 100644 --- a/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c +++ b/tools/testing/selftests/filesystems/epoll/epoll_wakeup_test.c @@ -3538,4 +3538,27 @@ TEST(epoll65) close(ctx.efd[1]); } +TEST(epoll66) +{ + struct epoll_event event; + int pfd[2], efd; + + ASSERT_EQ(pipe(pfd), 0); + + efd = epoll_create1(0); + ASSERT_GE(efd, 0); + + event.events = EPOLLIN | EPOLLET; + ASSERT_EQ(epoll_ctl(efd, EPOLL_CTL_ADD, pfd[0], &event), 0); + + for (int i = 0; i < 2; ++i) { + ASSERT_EQ(write(pfd[1], "", 1), 1); + EXPECT_EQ(epoll_wait(efd, &event, 1, 0), 1); + } + + close(pfd[0]); + close(pfd[1]); + close(efd); +} + TEST_HARNESS_MAIN |