linux中从文件获取当前网卡的工作模式

转自：http://bbs.chinaunix.net/thread-1940813-2-1.html

 

 

//copy by duanjigang from source code of ethtool 6
struct ethtool_cmd
{
    __u32   cmd;
    __u32   supported;  /* Features this interface supports */
    __u32   advertising;    /* Features this interface advertises */
    __u16   speed;      /* The forced speed, 10Mb, 100Mb, gigabit */
    __u8    duplex;     /* Duplex, half or full */
    __u8    port;       /* Which connector port */
    __u8    phy_address;
    __u8    transceiver;    /* Which transceiver to use */
    __u8    autoneg;    /* Enable or disable autonegotiation */
    __u32   maxtxpkt;   /* Tx pkts before generating tx int */
    __u32   maxrxpkt;   /* Rx pkts before generating rx int */
    __u32   reserved[4];
};
int get_settings(const char* devname)
{
        struct ifreq ifr;
        int fd;
        struct ethtool_cmd ecmd;
            int allfail = 1;

        /* Setup our control structures. */
        memset(&ifr, 0, sizeof(ifr));
        strcpy(ifr.ifr_name, devname);

        fd = socket(AF_INET, SOCK_DGRAM, 0);
        if (fd < 0)
           {
                return -1;
        } 

            ecmd.cmd = 1;
            ifr.ifr_data = (caddr_t)&ecmd;
            if(ioctl(fd, SIOCETHTOOL, &ifr))
        {
                close(fd);
                return -1;
        }
        //duplex 0 half 1 full
            fprintf(stdout, "Settings for %s: speed:%d, duplex:%s\n", devname, ecmd.speed, ecmd.duplex ? "full" : "half");
        close(fd);
        return 1;
}

 

http://hi.baidu.com/deep_pro/blog/item/8473bed9df3bce2010df9bfc.html

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <stdlib.h>
#include <unistd.h>

typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned char u8;

#include <linux/ethtool.h>
#include <linux/sockios.h>

int get_settings(const char* devname)
{
struct ifreq ifr;
int fd;
struct ethtool_cmd ecmd;
int allfail = 1;

/* Setup our control structures. */
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, devname);

fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0)
{
   return -1;
}

ecmd.cmd = 1;
ifr.ifr_data = (caddr_t)&ecmd;
if(ioctl(fd, SIOCETHTOOL, &ifr))
{
   close(fd);
   perror("SIOCETHTOOL");
   return -1;
}
        //duplex 0 half 1 full
fprintf(stdout, "Settings for %s: speed:%d, duplex:%s\n", devname, ecmd.speed,

ecmd.duplex ? "full" : "half");
close(fd);
return 1;
}
int main(int argc, char *argv[])
{

int ret =get_settings(argv[1]);
printf("%d\n",ret);
return EXIT_SUCCESS;
}