linux 擷取本地mac地址(指定網卡)

// 擷取本地macstd::string getLocalMac(){#ifndef _WIN32int sock_mac;struct ifreq ifr_mac;char mac_addr[30];sock_mac = socket(AF_INET, SOCK_STREAM, 0);if (sock_mac == -1){perror("create socket falise...mac\n");return "";}memset(&ifr_mac, 0, sizeof(ifr_mac));strncpy(ifr_mac.ifr_name, "eth0", sizeof(ifr_mac.ifr_name) - 1);if ((ioctl(sock_mac, SIOCGIFHWADDR, &ifr_mac)) < 0){printf("mac ioctl error\n");close(sock_mac);return "";}sprintf(mac_addr, "%02X:%02X:%02X:%02X:%02X:%02X",(unsigned char)ifr_mac.ifr_hwaddr.sa_data[0],(unsigned char)ifr_mac.ifr_hwaddr.sa_data[1],(unsigned char)ifr_mac.ifr_hwaddr.sa_data[2],(unsigned char)ifr_mac.ifr_hwaddr.sa_data[3],(unsigned char)ifr_mac.ifr_hwaddr.sa_data[4],(unsigned char)ifr_mac.ifr_hwaddr.sa_data[5]);close(sock_mac);return mac_addr;#elsereturn "00:00:00:00:00:00";#endif}