Re: [PATCH 06/13] keys: Add a notification facility [ver #4]

Jonathan Corbet
2019-06-10T17:11:14Z

On Fri, 07 Jun 2019 15:18:19 +0100
David Howells <dhowells@redhat.com> wrote:

> Add a key/keyring change notification facility whereby notifications about
> changes in key and keyring content and attributes can be received.
>
> Firstly, an event queue needs to be created:
>
> fd = open("/dev/event_queue", O_RDWR);
> ioctl(fd, IOC_WATCH_QUEUE_SET_SIZE, page_size << n);
>
> then a notification can be set up to report notifications via that queue:
>
> struct watch_notification_filter filter = {
> .nr_filters = 1,
> .filters = {
> [0] = {
> .type = WATCH_TYPE_KEY_NOTIFY,
> .subtype_filter[0] = UINT_MAX,
> },
> },
> };
> ioctl(fd, IOC_WATCH_QUEUE_SET_FILTER, &filter);
> keyctl_watch_key(KEY_SPEC_SESSION_KEYRING, fd, 0x01);

One little nit: it seems that keyctl_watch_key is actually spelled
keyctl(KEYCTL_WATCH_KEY, ...).

jon