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2019-04-17Add io_uring_cqe_seen()Jens Axboe
There's a failure case where an application gets a cqe entry, but the kernel can then overwrite it before the application is done reading it. This can happen since the io_uring_{get,wait}_completion() interface both returns a CQE pointer AND increments the ring index. If the kernel reuses this entry before the applications is done reading it, the contents may be corrupted. Remove the CQ head increment from the CQE retrieval, and put it into a separate helper, io_uring_cqe_seen(). The application must call this helper when it got a new CQE entry through one of the above calls, and it's now done reading it. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-01-18test/poll: ignore parent dyingJens Axboe
The parent may well die before the child is done, as long as it wrote to the pipe, we're fine. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-01-18test/poll: simply test caseJens Axboe
Just setup one ring in the child process, and poll for when the read side of the pipe is readable. From the parent, write something to the pipe. If nothing happens within 1 second, fail the test. Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-01-18Switch to IORING_OP_POLL_ADD/REMOVEJens Axboe
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-01-17Add sqe prep helpersJens Axboe
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-01-17Update POLL APIJens Axboe
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2019-01-17Add test case for IORING_OP_POLLJens Axboe
Signed-off-by: Jens Axboe <axboe@kernel.dk>