Date: Fri, 23 Jun 2017 00:40:09 +0000 (UTC) From: Alan Somers <asomers@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r320255 - in head: lib/libc/sys share/man/man4 Message-ID: <201706230040.v5N0e9pk015845@repo.freebsd.org>
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Author: asomers Date: Fri Jun 23 00:40:09 2017 New Revision: 320255 URL: https://svnweb.freebsd.org/changeset/base/320255 Log: Clarify usage of aio(4) with kqueue(2) Reviewed by: jhb MFC after: 3 weeks Differential Revision: https://reviews.freebsd.org/D11299 Modified: head/lib/libc/sys/kqueue.2 head/share/man/man4/aio.4 Modified: head/lib/libc/sys/kqueue.2 ============================================================================== --- head/lib/libc/sys/kqueue.2 Fri Jun 23 00:27:40 2017 (r320254) +++ head/lib/libc/sys/kqueue.2 Fri Jun 23 00:40:09 2017 (r320255) @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd June 17, 2017 +.Dd June 22, 2017 .Dt KQUEUE 2 .Os .Sh NAME @@ -351,33 +351,18 @@ case. Takes a descriptor as the identifier, and returns whenever there is no remaining data in the write buffer. .It Dv EVFILT_AIO -The sigevent portion of the AIO request is filled in, with -.Va sigev_notify_kqueue -containing the descriptor of the kqueue that the event should -be attached to, -.Va sigev_notify_kevent_flags -containing the kevent flags which should be -.Dv EV_ONESHOT , -.Dv EV_CLEAR -or -.Dv EV_DISPATCH , -.Va sigev_value -containing the udata value, and -.Va sigev_notify -set to -.Dv SIGEV_KEVENT . -When the -.Fn aio_* -system call is made, the event will be registered -with the specified kqueue, and the -.Va ident -argument set to the -.Fa struct aiocb -returned by the -.Fn aio_* -system call. +Events for this filter are not registered with +.Fn kevent +directly but are registered via the +.Va aio_sigevent +member of an asychronous I/O request when it is scheduled via an asychronous I/O +system call such as +.Fn aio_read . The filter returns under the same conditions as .Fn aio_error . +For more details on this filter see +.Xr sigevent 3 and +.Xr aio 4 . .It Dv EVFILT_VNODE Takes a file descriptor as the identifier and the events to watch for in .Va fflags , Modified: head/share/man/man4/aio.4 ============================================================================== --- head/share/man/man4/aio.4 Fri Jun 23 00:27:40 2017 (r320254) +++ head/share/man/man4/aio.4 Fri Jun 23 00:40:09 2017 (r320255) @@ -27,7 +27,7 @@ .\" .\" $FreeBSD$ .\" -.Dd July 21, 2016 +.Dd June 22, 2017 .Dt AIO 4 .Os .Sh NAME @@ -161,11 +161,27 @@ field which can be used to request notification when a For .Dv SIGEV_KEVENT notifications, -the posted kevent will contain: +the +.Va sigevent +.Ap +s +.Va sigev_notify_kqueue +field should contain the descriptor of the kqueue that the event should be attached +to, its +.Va sigev_notify_kevent_flags +field may contain +.Dv EV_ONESHOT , +.Dv EV_CLEAR , and/or +.Dv EV_DISPATCH , and its +.Va sigev_notify +field should be set to +.Dv SIGEV_KEVENT . +The posted kevent will contain: .Bl -column ".Va filter" .It Sy Member Ta Sy Value .It Va ident Ta asynchronous I/O control buffer pointer .It Va filter Ta Dv EVFILT_AIO +.It Va flags Ta Dv EV_EOF .It Va udata Ta value stored in .Va aio_sigevent.sigev_value
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