linux uevent机制

// 创建并绑定Netlink套接字
struct sockaddr_nl addr;
int sockfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_KOBJECT_UEVENT);
memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
addr.nl_pid = getpid();
addr.nl_groups = 1; // 订阅所有uevent
bind(sockfd, (struct sockaddr*)&addr, sizeof(addr));

// 接收并处理uevent
char buf[4096];
struct iovec iov;
iov.iov_base = buf;
iov.iov_len = sizeof(buf);
struct msghdr msg;
memset(&msg, 0, sizeof(msg));
msg.msg_iov = &iov;
msg.msg_iovlen = 1;
recvmsg(sockfd, &msg, 0);

// 解析uevent数据
char *devpath = NULL;
char *action = NULL;
for (char *token = strtok(buf, "\0"); token != NULL; token = strtok(NULL, "\0")) {
    if (strncmp(token, "ACTION=", 7) == 0) {
        action = token + 7;
    } else if (strncmp(token, "DEVPATH=", 8) == 0) {
        devpath = token + 8;
    }
}
if (action && devpath) {
    // 处理具体的uevent
}