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Date: Thu, 1 Mar 2007 15:34:35 -0800 From: Stephen Hemminger <shemminger@...ux-foundation.org> To: Eric Dumazet <dada1@...mosbay.com> Cc: John find <linux.kernel@...e.fr>, linux-net@...r.kernel.org, netdev@...r.kernel.org Subject: Re: CLOCK_MONOTONIC datagram timestamps by the kernel On Fri, 02 Mar 2007 00:14:37 +0100 Eric Dumazet <dada1@...mosbay.com> wrote: > Stephen Hemminger a écrit : > > > > > You probably want to add a SO_TIMESTAMPNS setsockopt() value like existing SO_TIMESTAMP > > You mean an alias like this ? > > #define SO_TIMESTAMPNS SO_TIMESTAMP > > Or should we really use another value ? Another value since if someone turns on SO_TIMESTAMP they want usec (timeval) and SO_TIMESTAMPNS would be for nanosecond values. Trying to set both flags would be not allowed. - original - If the SO_TIMESTAMP option is enabled on a SOCK_DGRAM socket, the recvmsg(2) call will return a timestamp corresponding to when the data- gram was received. The msg_control field in the msghdr structure points to a buffer that contains a cmsghdr structure followed by a struct timeval. The cmsghdr fields have the following values: cmsg_len = sizeof(struct timeval) cmsg_level = SOL_SOCKET cmsg_type = SCM_TIMESTAMP - add - If the SO_TIMESTAMPNS option is enabled on a SOCK_DGRAM socket, ... cmsg_len = sizeof(struct timespec) cmsg_level = SOL_SOCKET cmsg_type = SCM_TIMESTAMPNS -- Stephen Hemminger <shemminger@...ux-foundation.org> - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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