C语言实现获取网络带宽占用情况

    // filename: getNet.c  
    // command sample: ./getNet eth0  
    // compile command: gcc -p -g  getNet.c && gcc -o getNet getNet.c  
      
      
    #include <string.h>  
    #include <sys/ioctl.h>  
    #include <string.h>  
    #include <errno.h>  
    #include <linux/sockios.h>  
    #include <net/if.h>  
    #include <stdio.h>  
    #include <stdint.h>  
    #include <stddef.h>  
    #include <stdlib.h>  
    #include <sys/stat.h>  
    #include <sys/types.h>  
    #include <sys/socket.h>  
      
      
    #ifndef SIOCETHTOOL  
    #define SIOCETHTOOL     0x8946  
    #endif  
    #ifndef ARRAY_SIZE  
    #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))  
    #endif  
      
    /* CMDs currently supported */  
    #define ETHTOOL_GSET        0x00000001 /* Get settings. */  
    #define ETHTOOL_SSET        0x00000002 /* Set settings. */