netlink - phpMan

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  func-
              tion  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 ker-
       nel interface.


SEE ALSO
       netlink(7)

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



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

Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache/1.3.41 (Unix) PHP/5.2.5 mod_perl/1.30 mod_gzip/1.3.26.1a
Under GNU General Public License
2008-08-30 09:57 @38.103.63.61 CrawledBy CCBot/1.0 (+http://www.commoncrawl.org/bot.html)