以编程方式获取链接速度? [英] Get link speed programmatically?

问题描述

我正在编写一个报告本地计算机上网络设备属性的应用程序.我需要mac地址，mtu，链接速度和其他一些信息.我为此使用udev.我已经弄清楚了如何获取mac地址和mtu，但还没有找到如何提高链接速度.我可以从终端上使用ethtool来获取它，但是我需要一种以编程方式获取它的方法.

I am writing an application that reports attributes of network devices on the local machine. I need the mac address, mtu, link speed and a few others. I'm using udev for this. I've already figured out how to get the mac address and mtu, but not how to get the link speed. I can get it with ethtool from the terminal, but I need a way to get it programmatically.

有人知道我如何使用udev或其他库获取链接速度属性吗?

Does anyone know how I can get the link speed attribute with udev or another library?

推荐答案

您需要使用SIOCETHTOOL ioctl()调用.有一个不错的 ioctl/SIOCETHTOOL的介绍在LinuxJournal上调用，下面的代码(并非旨在作为C良好实践的例子！)应向您展示如何使用它来提高速度.

You need to use the SIOCETHTOOL ioctl() call. There's a nice introduction to ioctl/SIOCETHTOOL call on LinuxJournal, and the code below (which is not intended to be an example of good C practices!) should show you how to use it to get the speed.

#include <stdio.h>
#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>

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");
        exit(1);
    }
    switch (ethtool_cmd_speed(&edata)) {
        case SPEED_10: printf("10Mbps\n"); break;
        case SPEED_100: printf("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);
}

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