printetheraddrs.c

来自「vxworks 下的网络程序源码 包括」· C语言 代码 · 共 65 行

/* printEtherAddrs.c - Prints the ethernet address of a network
  *                     interface on the VxWorks target
  */
 
 /* Copyright 1984-1997 Wind River Systems, Inc. */
 
 /*
 modification history
 --------------------
 01c,06nov97,mm   added copyright.
 01b,15Sep97,mm   included <string.h> and changed "if.h" to "net/if.h"
 01a,16Feb93,ms   written
 */
 
 #include <string.h>
 #include "vxWorks.h"
 #include "stdio.h"
 #include "net/if.h"
 #include "etherLib.h"
 
 /*****************************************************************************
  * printEtherAddrs - Demo for printing the ethernet address of the network
  *                   interface in the VxWorks target.
  *
  * EXAMPLE:
  *
  *     To run printEtherAddrs from the VxWorks shell do as follows: 
  *
  *     ->  printEtherAddrs ("nameOfTheNetworkInterface")
  *
  *     where nameOfTheNetworkInterface is the name of the network
  *     interface in your the VxWorks target (Eg: "ln0")
  *
  */
    
 void printEtherAddrs 
     (
     char *netIfName        /* name of the network interface */
     )
     {
     struct ifnet    *ifPtr; /* Pointer to network interface's ifnet struct */
     unsigned char enet[6];  /* This is a temporary variable used in this demo
                              * for storing the Ethernet address of the network
                              * interface.
                              */
                             
 
     if ((ifPtr = ifunit (netIfName)) == NULL)
         printf ("Interface not found \n");
     else
         {       
         /* get the ethernet address from the arpcom structure (arpcom
          * structure is shared between the network interface 
          * driver and address resolution code) and print it. The first data
          * element in an arpcom structure (vw/h/netinet/if_ether.h) is an 
          * ifnet structure (vw/h/net/if.h) (hence the address of arpcom and 
          * ifnet structures are the same for any given network). 
          */
         bcopy ((char *) ((struct arpcom *) ifPtr)->ac_enaddr, enet, 
                 sizeof (enet)); 
         printf(" Ethernet address is %02x:%02x:%02x:%02x:%02x:%02x\n",
                   enet [0], enet [1], enet [2], enet [3], enet [4], enet[5]);
 	}
     }