嵌入式

linux c检测网线热插拔(netlink)

2019-07-13 03:27发布生成海报

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linux c检测网线热插拔(netlink)

2016-02-19 09:37 本站整理浏览(14) #include #include #include #include #include #include #include #include #include #include #include #define BUFLEN 20480 int main(int argc, char *argv[]) { int fd, retval; char buf[BUFLEN] = {0}; int len = BUFLEN; struct sockaddr_nl addr; struct nlmsghdr *nh; struct ifinfomsg *ifinfo; struct rtattr *attr; fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)); memset(&addr, 0, sizeof(addr)); addr.nl_family = AF_NETLINK; addr.nl_groups = RTNLGRP_LINK; bind(fd, (struct sockaddr*)&addr, sizeof(addr)); while ((retval = read(fd, buf, BUFLEN)) > 0) { for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, retval); nh = NLMSG_NEXT(nh, retval)) { if (nh->nlmsg_type == NLMSG_DONE) break; else if (nh->nlmsg_type == NLMSG_ERROR) return -1; else if (nh->nlmsg_type != RTM_NEWLINK) continue; ifinfo = NLMSG_DATA(nh); printf("%u: %s", ifinfo->ifi_index, (ifinfo->ifi_flags & IFF_LOWER_UP) ? "up" : "down" ); attr = (struct rtattr*)(((char*)nh) + NLMSG_SPACE(sizeof(*ifinfo))); len = nh->nlmsg_len - NLMSG_SPACE(sizeof(*ifinfo)); for (; RTA_OK(attr, len); attr = RTA_NEXT(attr, len)) { if (attr->rta_type == IFLA_IFNAME) { printf(" %s", (char*)RTA_DATA(attr)); break; } } printf(" "); } } return 0; }
示例输出：
2: down eth0 // 拔出网线 2: up eth0 // 插入网线
源地址：
http://www.cpplive.com/html/1542.html