On 1/28/19 7:57 AM, Christoph Hellwig wrote: > [please make sure linux-api and linux-man are CCed on new syscalls > so that we get API experts to review them] > >> io_uring_enter(fd, to_submit, min_complete, flags) >> Initiates IO against the rings mapped to this fd, or waits for >> them to complete, or both. The behavior is controlled by the >> parameters passed in. If 'to_submit' is non-zero, then we'll >> try and submit new IO. If IORING_ENTER_GETEVENTS is set, the >> kernel will wait for 'min_complete' events, if they aren't >> already available. It's valid to set IORING_ENTER_GETEVENTS >> and 'min_complete' == 0 at the same time, this allows the >> kernel to return already completed events without waiting >> for them. This is useful only for polling, as for IRQ >> driven IO, the application can just check the CQ ring >> without entering the kernel. > > Especially with poll support now in the series, don't we need a ѕigmask > argument similar to pselect/ppoll/io_pgetevents now to deal with signal > blocking during waiting for events? Is there any way to avoid passing in the sigset_t size? If it's just a 32-bit/64-bit thing, surely the in_compat_syscall() could cover it? Or are there other cases that need to be catered to? -- Jens Axboe
