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getsockopt.2: clarify that SO_TIMESTAMP is not 100% reliable

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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
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D21607
This commit is contained in:
Alan Somers 2019-09-11 19:48:32 +00:00
parent 6c0c362075
commit 8d910a4282
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=352231
1 changed files with 3 additions and 2 deletions
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5
lib/libc/sys/getsockopt.2
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@ -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