diff options
| author | ed <ed@FreeBSD.org> | 2015-08-05 07:34:29 +0000 |
|---|---|---|
| committer | ed <ed@FreeBSD.org> | 2015-08-05 07:34:29 +0000 |
| commit | 4a54322f0b8dcd72b1946004f9b964ef0093af1a (patch) | |
| tree | 0e4fdb0a44c0bf8b91e9306d51abf85405ebba59 /sys/sys/event.h | |
| parent | 15c1eedd90810a194d5eb7c501b5c7519bd9347c (diff) | |
| download | FreeBSD-src-4a54322f0b8dcd72b1946004f9b964ef0093af1a.zip FreeBSD-src-4a54322f0b8dcd72b1946004f9b964ef0093af1a.tar.gz | |
Make it possible to implement poll(2) on top of kqueue(2).
It looks like EVFILT_READ and EVFILT_WRITE trigger under the same
conditions as poll()'s POLLRDNORM and POLLWRNORM as described by POSIX.
The only difference is that POLLRDNORM has to be triggered on regular
files unconditionally, whereas EVFILT_READ only triggers when not EOF.
Introduce a new flag, NOTE_FILE_POLL, that can be used to make
EVFILT_READ and EVFILT_WRITE behave identically to poll(). This flag
will be used by cloudlibc's poll() function.
Reviewed by: jmg
Differential Revision: https://reviews.freebsd.org/D3303
Diffstat (limited to 'sys/sys/event.h')
| -rw-r--r-- | sys/sys/event.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/sys/event.h b/sys/sys/event.h index 089c9b3..0f13231 100644 --- a/sys/sys/event.h +++ b/sys/sys/event.h @@ -108,6 +108,7 @@ struct kevent { * data/hint flags for EVFILT_{READ|WRITE}, shared with userspace */ #define NOTE_LOWAT 0x0001 /* low water mark */ +#define NOTE_FILE_POLL 0x0002 /* behave like poll() */ /* * data/hint flags for EVFILT_VNODE, shared with userspace |
