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RedHat 9 (Linux i386) - man page for netlink (redhat section 3)

NETLINK(3)			    Linux Programmer's Manual			       NETLINK(3)

NAME
       netlink - Netlink macros

SYNOPSIS
       #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);

DESCRIPTION
       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 only accessed using these macros.

       NLMSG_ALIGN
	      Round the length of a netlink message up to align it properly.

       NLMSG_LENGTH
	      Gets  the payload length as argument and returns the aligned length to store in the
	      nlmsg_len field of the nlmsghdr.

       NLMSG_SPACE
	      Return the number of bytes a netlink message with  payload  of  the  passed  length
	      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.

NOTES
       It is often better to use netlink via libnetlink than via the low level kernel interface.

SEE ALSO
       netlink(7)

       and ftp://ftp.inr.ac.ru/ip-routing/iproute2* for libnetlink

Linux Man Page				    1999-05-14				       NETLINK(3)


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