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 only be
accessed using 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 length parameter 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 ok to parse.
NLMSG_PAYLOAD
Return the length of the payload associated with the nlmsghdr.
This page is part of release 2.73 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/.
This manpage copyright 1998 by Andi Kleen. Subject to the GPL. Based on the original comments from Alexey Kuznetsov $Id: netlink.3,v 1.1 1999/05/14 17:17:24 freitag Exp $ |