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netlink — Netlink macros
#include <asm/types.h> #include <linux/netlink.h>
int
NLMSG_ALIGN( |
size_t len); |
int
NLMSG_LENGTH( |
size_t len); |
int
NLMSG_SPACE( |
size_t len); |
void
*NLMSG_DATA( |
struct nlmsghdr *nlh); |
struct nlmsghdr
*NLMSG_NEXT( |
struct nlmsghdr *nlh, |
int len); |
int
NLMSG_OK( |
struct nlmsghdr *nlh, |
int len); |
int
NLMSG_PAYLOAD( |
struct nlmsghdr *nlh, |
int len); |
<linux/netlink.h> defines several standard macros to
access or create a netlink datagram. They are similar in
spirit to the macros defined in cmsg(3) for auxiliary data.
The buffer passed to and from a netlink socket should be
accessed using only these macros.
NLMSG_ALIGN()Round the length of a netlink message up to align it properly.
NLMSG_LENGTH()Given the payload length, len, this macro returns
the aligned length to store in the nlmsg_len field of the nlmsghdr.
NLMSG_SPACE()Return the number of bytes that a netlink message
with payload of len would occupy.
NLMSG_DATA()Return a pointer to the payload associated with the passed nlmsghdr.
NLMSG_NEXT()Get the next nlmsghdr in a multipart message.
The caller must check if the current nlmsghdr didn't have the
NLMSG_DONE set—this
function doesn't return NULL on end. The len argument is an lvalue
containing the remaining length of the message buffer.
This macro decrements it by the length of the message
header.
NLMSG_OK()Return true if the netlink message is not truncated and is in a form suitable for parsing.
NLMSG_PAYLOAD()Return the length of the payload associated with the nlmsghdr.
This page is part of release 3.52 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man−pages/.
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This manpage copyright 1998 by Andi Kleen. %%%LICENSE_START(GPL_NOVERSION_ONELINE) Subject to the GPL. %%%LICENSE_END Based on the original comments from Alexey Kuznetsov $Id: netlink.3,v 1.1 1999/05/14 17:17:24 freitag Exp $ |