Linux c gets the NIC status (UP or DOWN), linuxup

Linux c gets the NIC status (UP or DOWN), linuxup

The source code is as follows:

#include <sys/socket.h>#include <sys/ioctl.h>#include <linux/if.h>#include <string.h>#include <stdio.h>char *net_detect(char* net_name){        int skfd = 0;        struct ifreq ifr;        skfd = socket(AF_INET, SOCK_DGRAM, 0);        if(skfd < 0) {                printf("%s:%d Open socket error!\n", __FILE__, __LINE__);                return NULL;        }        strcpy(ifr.ifr_name, net_name);        if(ioctl(skfd, SIOCGIFFLAGS, &ifr) <0 ) {                printf("%s:%d IOCTL error!\n", __FILE__, __LINE__);                printf("Maybe ethernet inferface %s is not valid!", ifr.ifr_name);                close(skfd);                return NULL;        }        if(ifr.ifr_flags & IFF_RUNNING) {                return "UP";        } else {                return "DOWN";        }}int main(){        printf("%s\n",net_detect("eth0"));        return 0;}

Summary:
This program is used to test the ifconfig command and specify that the NIC is RUNNING. You can use ifconfig eth0 up and ifconfig eth0 down for testing.

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