diff options
| author | Alan Somers <asomers@FreeBSD.org> | 2019-09-11 19:48:32 +0000 |
|---|---|---|
| committer | Alan Somers <asomers@FreeBSD.org> | 2019-09-11 19:48:32 +0000 |
| commit | 8d910a42823bf5d57e859949f355568657cc86dd (patch) | |
| tree | b903e2dc28e281a03cffcb657e050f1cf8b8d440 /lib | |
| parent | 6c0c3620756c2a567d64342f3e02253183952563 (diff) | |
| download | src-8d910a42823bf5d57e859949f355568657cc86dd.tar.gz src-8d910a42823bf5d57e859949f355568657cc86dd.zip | |
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
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D21607
Notes
Notes:
svn path=/head/; revision=352231
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/libc/sys/getsockopt.2 | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/libc/sys/getsockopt.2 b/lib/libc/sys/getsockopt.2 index 942346cdd728..3f786e67793f 100644 --- a/lib/libc/sys/getsockopt.2 +++ b/lib/libc/sys/getsockopt.2 @@ -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 |