uevent_get_property 使用的代码示例

以下是使用`uevent_get_property`函数获取`uevent`事件属性的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
#include <linux/netlink.h>

#define UEVENT_BUFFER_SIZE 2048

int main()
{
    int sockfd;
    struct sockaddr_nl sa;
    int len;
    char buffer[UEVENT_BUFFER_SIZE];

    sockfd = socket(AF_NETLINK, SOCK_RAW, NETLINK_KOBJECT_UEVENT);
    if (sockfd == -1) {
        perror("socket");
        return EXIT_FAILURE;
    }

    memset(&sa, 0, sizeof(sa));
    sa.nl_family = AF_NETLINK;
    sa.nl_groups = NETLINK_KOBJECT_UEVENT;

    if (bind(sockfd, (struct sockaddr *)&sa, sizeof(sa)) == -1) {
        perror("bind");
        close(sockfd);
        return EXIT_FAILURE;
    }

    while (1) {
        len = recv(sockfd, buffer, sizeof(buffer), 0);
        if (len == -1) {
            perror("recv");
            close(sockfd);
            return EXIT_FAILURE;
        }

        if (len > 0) {
            buffer[len] = '\0';
            char *str = buffer;

            while (*str) {
                printf("%s\n", str);
                str += strlen(str) + 1;
            }

            char *action = uevent_get_property(buffer, "ACTION");
            if (action) {
                printf("ACTION=%s\n", action);
            }

            char *subsystem = uevent_get_property(buffer, "SUBSYSTEM");
            if (subsystem) {
                printf("SUBSYSTEM=%s\n", subsystem);
            }
        }
    }

    close(sockfd);
    return EXIT_SUCCESS;
}

此示例代码创建一个`NETLINK_KOBJECT_UEVENT`类型的套接字，监听系统中的`uevent`事件，并使用`uevent_get_property`函数获取事件属性。每当接收到一个新事件时，程序将打印所有事件信息以及`ACTION`和`SUBSYSTEM`属性。