socket套接字网卡绑定和优先级调整

SO_BINDTODEVICE  套接字网络接口绑定选项

SO_PRIORITY      套接字优先级选项

通过调用setsocketopt函数来设置一系列socket选项

/**
*SO_BINDTODEVICE  套接字网络接口绑定选项
*SO_PRIORITY      套接字优先级选项
*/

#include
#include
#include
#include /*ioctl命令*/
#include /*ethhdr结构*/
#include /*ifreq结构*/
#include
#include
#include
#include /*in_addr结构*/
#include /*iphdr结构*/
#include /*udphdr结构*/
#include /*tcphdr结构*/

int main(int argc, char *argv[]){
    int err;
    int s = socket(AF_INET , SOCK_STREAM , 0);
    char ifname[] = "eno1"; /*绑定网卡名称*/
    struct ifreq if_etho1;  /*绑定网卡结构*/
    strncpy(if_etho1.ifr_name , ifname , IFNAMSIZ); /*将网卡名称放到结构成员ifr_name中*/
    err = setsockopt(s , SOL_SOCKET , SO_BINDTODEVICE , (char*)&if_etho1 , sizeof(if_etho1)); /*将s绑定到网卡etho1上*/
    if(err){//失败
        printf("setsockopt SO_BINDTODEVCIE failure \n");
    }else{ //成功
        printf("setsockopt SO_BINDTODEVCIE success \n");
    }
    int opt = 6; /*优先级 0 ~ 6 ：6 最高，优先处理*/
    err = setsockopt(s , SOL_SOCKET , SO_PRIORITY , &opt , sizeof(opt));/*设置s的优先级*/
    if(err){//失败
        printf("setsockopt SO_PRIORITY failure \n");
    }else{ //成功
        printf("setsockopt SO_PRIORITY success \n");
    }

    return 0;
}