Date: Mon, 16 Sep 2019 00:59:10 +0000 (UTC) From: Alan Somers <asomers@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r352372 - stable/12/lib/libc/sys Message-ID: <201909160059.x8G0xALQ006384@repo.freebsd.org>
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Author: asomers Date: Mon Sep 16 00:59:10 2019 New Revision: 352372 URL: https://svnweb.freebsd.org/changeset/base/352372 Log: MFC r352231: getsockopt.2: clarify that SO_TIMESTAMP is not 100% reliable When SO_TIMESTAMP is set, the kernel will attempt to attach a timestamp as ancillary data to each IP datagram that is received on the socket. However, it may fail, for example due to insufficient memory. In that case the packet will still be received but not timestamp will be attached. Reviewed by: kib Differential Revision: https://reviews.freebsd.org/D21607 Modified: stable/12/lib/libc/sys/getsockopt.2 Directory Properties: stable/12/ (props changed) Modified: stable/12/lib/libc/sys/getsockopt.2 ============================================================================== --- stable/12/lib/libc/sys/getsockopt.2 Mon Sep 16 00:56:33 2019 (r352371) +++ stable/12/lib/libc/sys/getsockopt.2 Mon Sep 16 00:59:10 2019 (r352372) @@ -28,7 +28,7 @@ .\" @(#)getsockopt.2 8.4 (Berkeley) 5/2/95 .\" $FreeBSD$ .\" -.Dd February 10, 2019 +.Dd September 11, 2019 .Dt GETSOCKOPT 2 .Os .Sh NAME @@ -431,7 +431,8 @@ option is enabled on a .Dv SOCK_DGRAM socket, the .Xr recvmsg 2 -call will return a timestamp corresponding to when the datagram was received. +call may return a timestamp corresponding to when the datagram was received. +However, it may not, for example due to a resource shortage. The .Va msg_control field in the
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