XDR_WRITE_PAGES(9) Linux Networking XDR_WRITE_PAGES(9)NAME
xdr_write_pages - Insert a list of pages into an XDR buffer for sending
SYNOPSIS
void xdr_write_pages(struct xdr_stream * xdr, struct page ** pages, unsigned int base, unsigned int len);
ARGUMENTS
xdr
pointer to xdr_stream
pages
list of pages
base
offset of first byte
len
length of data in bytes
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 XDR_WRITE_PAGES(9)
Check Out this Related Man Page
RTNETLINK(3) Linux Programmer's Manual RTNETLINK(3)NAME
rtnetlink - macros to manipulate rtnetlink messages
SYNOPSIS
#include <asm/types.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <sys/socket.h>
rtnetlink_socket = socket(AF_NETLINK, int socket_type, NETLINK_ROUTE);
int RTA_OK(struct rtattr *rta, int rtabuflen);
void *RTA_DATA(struct rtattr *rta);
unsigned int RTA_PAYLOAD(struct rtattr *rta);
struct rtattr *RTA_NEXT(struct rtattr *rta, unsigned int rtabuflen);
unsigned int RTA_LENGTH(unsigned int length);
unsigned int RTA_SPACE(unsigned int length);
DESCRIPTION
All rtnetlink(7) messages consist of a netlink(7) message header and appended attributes. The attributes should be only manipulated using
the macros provided here.
RTA_OK(rta, attrlen) returns true if rta points to a valid routing attribute; attrlen is the running length of the attribute buffer. When
not true then you must assume there are no more attributes in the message, even if attrlen is nonzero.
RTA_DATA(rta) returns a pointer to the start of this attribute's data.
RTA_PAYLOAD(rta) returns the length of this attribute's data.
RTA_NEXT(rta, attrlen) gets the next attribute after rta. Calling this macro will update attrlen. You should use RTA_OK to check the
validity of the returned pointer.
RTA_LENGTH(len) returns the length which is required for len bytes of data plus the header.
RTA_SPACE(len) returns the amount of space which will be needed in a message with len bytes of data.
CONFORMING TO
These macros are nonstandard Linux extensions.
BUGS
This manual page is incomplete.
EXAMPLE
Creating a rtnetlink message to set the MTU of a device:
#include <linux/rtnetlink.h>
...
struct {
struct nlmsghdr nh;
struct ifinfomsg if;
char attrbuf[512];
} req;
struct rtattr *rta;
unsigned int mtu = 1000;
int rtnetlink_sk = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
memset(&req, 0, sizeof(req));
req.nh.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req.nh.nlmsg_flags = NLM_F_REQUEST;
req.nh.nlmsg_type = RTM_NEWLINK;
req.if.ifi_family = AF_UNSPEC;
req.if.ifi_index = INTERFACE_INDEX;
req.if.ifi_change = 0xffffffff; /* ??? */
rta = (struct rtattr *)(((char *) &req) +
NLMSG_ALIGN(req.nh.nlmsg_len));
rta->rta_type = IFLA_MTU;
rta->rta_len = RTA_LENGTH(sizeof(unsigned int));
req.n.nlmsg_len = NLMSG_ALIGN(req.nh.nlmsg_len) +
RTA_LENGTH(sizeof(mtu));
memcpy(RTA_DATA(rta), &mtu, sizeof(mtu));
send(rtnetlink_sk, &req, req.nh.nlmsg_len);
SEE ALSO netlink(3), netlink(7), rtnetlink(7)COLOPHON
This page is part of release 3.44 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/.
GNU 2012-03-24 RTNETLINK(3)
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