From nobody Wed Oct 06 07:04:38 2021 X-Original-To: dev-commits-src-branches@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 10B3D12D5759; Wed, 6 Oct 2021 07:04:39 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HPQS65GFmz3h87; Wed, 6 Oct 2021 07:04:38 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 791E61BC4F; Wed, 6 Oct 2021 07:04:38 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.16.1/8.16.1) with ESMTP id 19674crt024469; Wed, 6 Oct 2021 07:04:38 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.16.1/8.16.1/Submit) id 19674cdg024468; Wed, 6 Oct 2021 07:04:38 GMT (envelope-from git) Date: Wed, 6 Oct 2021 07:04:38 GMT Message-Id: <202110060704.19674cdg024468@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Kyle Evans Subject: git: b7e90b290ab5 - stable/13 - kqueue: document how timers with low/past timeouts are handled List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-branches@freebsd.org X-BeenThere: dev-commits-src-branches@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kevans X-Git-Repository: src X-Git-Refname: refs/heads/stable/13 X-Git-Reftype: branch X-Git-Commit: b7e90b290ab511dbbf1f1598e49092aaa73599e6 Auto-Submitted: auto-generated X-ThisMailContainsUnwantedMimeParts: N The branch stable/13 has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=b7e90b290ab511dbbf1f1598e49092aaa73599e6 commit b7e90b290ab511dbbf1f1598e49092aaa73599e6 Author: Kyle Evans AuthorDate: 2021-09-30 18:19:05 +0000 Commit: Kyle Evans CommitDate: 2021-10-06 07:04:00 +0000 kqueue: document how timers with low/past timeouts are handled (cherry picked from commit 4b5554cebb66020f59dc869b835aebbd66e4bb8c) --- lib/libc/sys/kqueue.2 | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/lib/libc/sys/kqueue.2 b/lib/libc/sys/kqueue.2 index ed737c626ef8..ffcddc00303f 100644 --- a/lib/libc/sys/kqueue.2 +++ b/lib/libc/sys/kqueue.2 @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd September 7, 2021 +.Dd October 6, 2021 .Dt KQUEUE 2 .Os .Sh NAME @@ -584,6 +584,12 @@ On return, .Va fflags contains the events which triggered the filter. .Pp +Periodic timers with a specified timeout of 0 will be silently adjusted to +timeout after 1 of the time units specified by the requested precision in +.Va fflags . +If an absolute time is specified that has already passed, then it is treated as +if the current time were specified and the event will fire as soon as possible. +.Pp If an existing timer is re-added, the existing timer will be effectively canceled (throwing away any undelivered record of previous timer expiration) and re-started using the new parameters contained in