Kohji Okuno wrote this message on Fri, Feb 28, 2014 at 21:29 +0900: > > Kohji Okuno wrote this message on Fri, Feb 28, 2014 at 11:13 +0900: > >> I have a question about kevent. > >> > >> How should the userland judge knote which is cleared from knlist by > >> knlist_clear() or knlist_delete()? > > > > It looks like I need to read the code better... knlist_clear (killkn=0) > > and knlist_delete (killkn=1) are wrappers around knlist_cleardel... > > > > Looking at the code of knlist_cleardel, if killkn is set > > (knlist_delete) the knote will be dropped (free'd)... if it is not set, > > the flags _EOF and _ONESHOT will be set such that it'll be returned > > soon.. > > > > Now that I look at the code, KNOTE_ACTIVATE is never called to be put > > on the list to be delivered, so now I'm not sure if it works the way > > it's suppose to... I have a feeling that the notes might hang around > > forever until the kq fd is closed... > > > > I'm also puzzled as to why _DETACHED isn't set, which would seem to > > mean that we'll call f_detach when we close the kq, which I assume > > could cause a panic... > > > > This needs to be investigated/tested... > > Thank you for your comment. > > I tried test by usb_dev. When a USB device is lost suddenly, I can > receive EV_EOF|EV_ONESHOT on kevent->flags.
Ok, good, that means the documentation in knlist_clear(9) is correct... Thanks for verifing this for me... -- John-Mark Gurney Voice: +1 415 225 5579 "All that I will do, has been done, All that I have, has not." _______________________________________________ email@example.com mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"