linux c 获取网卡状态

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <unistd.h>
#include <netinet/in.h>

void get_interface_status(const char *interface_name) {
    int sockfd;
    struct ifreq ifr;

    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        perror("socket");
        return;
    }

    strncpy(ifr.ifr_name, interface_name, IFNAMSIZ - 1);
    ifr.ifr_name[IFNAMSIZ - 1] = '\0';

    if (ioctl(sockfd, SIOCGIFFLAGS, &ifr) < 0) {
        perror("ioctl");
        close(sockfd);
        return;
    }

    printf("Interface: %s\n", ifr.ifr_name);
    if (ifr.ifr_flags & IFF_UP) {
        printf("Status: UP\n");
    } else {
        printf("Status: DOWN\n");
    }

    if (ifr.ifr_flags & IFF_RUNNING) {
        printf("Link: Running\n");
    } else {
        printf("Link: Not Running\n");
    }

    close(sockfd);
}

int main() {
    get_interface_status("eth0"); // 替换为你的网卡名称
    return 0;
}