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Differential D21607

getsockopt.2: clarify that SO_TIMESTAMP is not 100% reliable
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Authored by asomers on Sep 11 2019, 6:59 PM.
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kib
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manpages
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rS359196: MFC r352231:
rS352372: MFC r352231:
rS352231: getsockopt.2: clarify that SO_TIMESTAMP is not 100% reliable
Summary

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.

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rS FreeBSD src repository - subversion
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Event Timeline

asomers created this revision.Sep 11 2019, 6:59 PM
Herald added a reviewer: manpages. · View Herald TranscriptSep 11 2019, 6:59 PM
Herald added a subscriber: imp. · View Herald Transcript
Harbormaster completed remote builds in B26402: Diff 61941.Sep 11 2019, 6:59 PM
kib added a comment.Sep 11 2019, 7:16 PM

May be add explicit language to the man page saying that resource shortage might prevent allocating the timestamp ? I believe it will be appreciated.

asomers updated this revision to Diff 61944.Sep 11 2019, 7:26 PM

Explicitly state that a timestamp may not be returned

Harbormaster completed remote builds in B26404: Diff 61944.Sep 11 2019, 7:26 PM
yuripv added a subscriber: yuripv.Sep 11 2019, 7:33 PM
yuripv added inline comments.
lib/libc/sys/getsockopt.2
31 ↗(On Diff #61944)

Typo: September.

asomers updated this revision to Diff 61946.Sep 11 2019, 7:37 PM

Fix typo

Harbormaster completed remote builds in B26405: Diff 61946.Sep 11 2019, 7:37 PM
kib accepted this revision.Sep 11 2019, 7:42 PM
This revision is now accepted and ready to land.Sep 11 2019, 7:42 PM
Closed by commit rS352231: getsockopt.2: clarify that SO_TIMESTAMP is not 100% reliable (authored by asomers). · Explain WhySep 11 2019, 7:48 PM
This revision was automatically updated to reflect the committed changes.
asomers added a commit: rS352231: getsockopt.2: clarify that SO_TIMESTAMP is not 100% reliable.
asomers added a commit: rS352372: MFC r352231:.Sep 16 2019, 12:59 AM
asomers added a commit: rS359196: MFC r352231:.Mar 21 2020, 6:24 PM

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head/
lib/
libc/
sys/
5 lines

Diff 61948

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head/lib/libc/sys/getsockopt.2

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