Messages in this thread | | | Subject | netlink: symantics for NLM_F_MULTI and NLMSG_DONE ? | From | Roger Willcocks <> | Date | Mon, 26 Oct 2009 19:14:53 +0000 |
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The netlink rfc (3549) says that in multi-part messages (messages split over multiple netlink packets), the first and all following headers have the NLM_F_MULTI flag set except for the last header which has the header type NLMSG_DONE.
afaict NLMSG_DONE is redundant, since one could simply not set the NLM_F_MULTI flag for the final header; and if a multi-part message can't cross a datagram boundary - which is assumed by e.g. the reading example in http://www.kernel.org/doc/man-pages/online/pages/man7/netlink.7.html - NLMSG_DONE is redundant too.
And the rfc doesn't say what NLMSG_DONE /and/ NLM_F_MULTI should mean, although net/netlink/af_netlink.c always sets both.
So, what are the symantics for NLM_F_MULTI and NLMSG_DONE?
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