您需要使用
SIOCETHTOOLioctl（）调用。在LinuxJournal上对ioctl
/
SIOCETHTOOL调用进行了很好的介绍，下面的代码（不旨在成为C良好实践的例子！）应向您展示如何使用它来提高速度。
#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("10Mbpsn"); break; case SPEED_100: printf("100Mbpsn"); break; case SPEED_1000: printf("1Gbpsn"); break; case SPEED_2500: printf("2.5Gbpsn"); break; case SPEED_10000: printf("10Gbpsn"); break; default: printf("Speed returned is %dn", edata.speed); } return (0);}
