嵌入式

Linux下检测以太网链路状态代码

2019-07-13 08:28发布

站内文章 / 嵌入式Linux
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该方法用到了ioctl操作ETHTOOL,需要root权限， 否则会失败！   // PARAM: devname -- just the device name such as eth0, eth1 etc. // RETURN: -1 -- error , details can check errno // 1 -- interface link up // 0 -- interface link down. int link_status(const char* devname) { int ret = 1; int fd; struct ifreq ifr; struct ethtool_value edata; edata.cmd = ETHTOOL_GLINK; edata.data = 0; memset(&ifr, 0, sizeof(ifr)); snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s", devname); ifr.ifr_data = (char *) &edata; if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { fprintf(stderr, "socket() error: %s ", strerror(errno)); ret = -1; goto done; } if (ioctl(fd, SIOCETHTOOL, &ifr) == -1) { fprintf(stderr, "ioctl() SIOCETHTOOL error: %s ", strerror(errno)); ret = -1; goto done; } ret = (edata.data > 0 ? 1 : 0); done: if (fd > 0) close(fd); return ret; }