개요

• 솔라나라에 설명된 어플리케이션에 대해 맨 페이지를 찾아 출력한다.
• MAN 페이지에 대한 설명은 윈디하나의 솔라나라: MAN 페이지을 참고하자.
• svcadm(8)을 검색하려면 섹션에서 8 을 선택하고, 맨 페이지 이름에 svcadm을 입력하고 검색을 누른다.

rtnetlink(3)

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 manipulated  only  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 mes‐
       sage, 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.nh.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, 0);

SEE ALSO
       netlink(3), netlink(7), rtnetlink(7)

COLOPHON
       This page is part of release 5.02 of the Linux  man-pages  project.   A
       description  of  the project, information about reporting bugs, and the
       latest    version    of    this    page,    can     be     found     at
       https://www.kernel.org/doc/man-pages/.



GNU                               2014-09-06                      RTNETLINK(3)