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/* 同一段代码对两个不同版本的 Linux 的工作方式不同,输出如下

Linux mamma-linux 2.6.27.19-5-default #1 SMP 2009-02-28 04:40:21 +0100 x86_64 x86_64 x86_64 GNU/Linux 输出:返回 false

Linux inblrbuildserver01 3.0.13-0.27-default #1 SMP 2012 年 2 月 15 日星期三 13:33:49 UTC (d73692b) x86_64 x86_64 x86_64 GNU/Linux

输出:速度为:100Mbps */

#include <sys/socket.h>#
##include <sys/ioctl.h> ##
###include <netinet/in.h>###
####include <linux/sockios.h>####
#####include <linux/if.h>#####
#####include <linux/ethtool.h> #####
######include <string.h>######
#######include <stdlib.h>#######
//#include <linux/wireless.h>
########include<iostream>#######
using namespace std;

int main (int argc, char **argv)
{
    int sock;
    struct ifreq ifr;
    struct ethtool_cmd edata;
    int rc;

    sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
    if (sock < 0) {
      //  perror("socket");
        exit(1);
    }

    strncpy(ifr.ifr_name, "eth0", sizeof(ifr.ifr_name));
    ifr.ifr_data = &edata;

    edata.cmd = ETHTOOL_GSET;

    rc = ioctl(sock, SIOCETHTOOL, &ifr);
    if (rc < 0) {
    //    perror("ioctl");
    cout<<" Returning false " <<endl;
        exit(1);
    }
    switch (edata.speed) {
        case SPEED_10: printf(" SPEED is : 10Mbps\n"); break;
        case SPEED_100: printf("SPEED is : 100Mbps\n"); break;
        case SPEED_1000: printf("1Gbps\n"); break;
        case SPEED_2500: printf("2.5Gbps\n"); break;
        case SPEED_10000: printf("10Gbps\n"); break;
        default: printf("Speed returned is %d\n", edata.speed);
    }

    return (0);
}

/*Linux mammo-linux 2.6.27.19-5-default #1 SMP 2009-02-28 04:40:21 +0100 x86_64 x86_64 x86_64 GNU/Linux
Returning false

Linux inblrbuildserver01 3.0.13-0.27-default #1 SMP Wed Feb 15 13:33:49 UTC 2012 (d73692b) x86_64 x86_64 x86_64 GNU/Linux

SPEED is : 100Mbps

*/

有人可以帮忙吗???

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1 回答 1

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这可能是因为ETHTOOL_GSET没有在内核 2.6.27 的网络适配器驱动程序中实现。如果您没有注释掉,您可以更确定地判断perror("ioctl")

于 2014-07-03T07:50:11.933 回答