tree 93944141541d10969d8d4aba91068785271d2692
parent 8bac3ba57eecc466b7e73dabf7d19328a59f684e
author Stefan Hajnoczi <stefanha@redhat.com> 1586337099 +0100
committer Stefan Hajnoczi <stefanha@redhat.com> 1586444106 +0100

aio-posix: signal-proof fdmon-io_uring

The io_uring_enter(2) syscall returns with errno=EINTR when interrupted
by a signal.  Retry the syscall in this case.

It's essential to do this in the io_uring_submit_and_wait() case.  My
interpretation of the Linux v5.5 io_uring_enter(2) code is that it
shouldn't affect the io_uring_submit() case, but there is no guarantee
this will always be the case.  Let's check for -EINTR around both APIs.

Note that the liburing APIs have -errno return values.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20200408091139.273851-1-stefanha@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>