内核发送uevent的API，用户空间解析uevent（转）

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

#define UEVENT_MSG_LEN 4096
struct luther_gliethttp {
const char *action;
const char *path;
const char *subsystem;
const char *firmware;
int major;
int minor;
};
static int open_luther_gliethttp_socket(void);
static void parse_event(const char *msg, struct luther_gliethttp *luther_gliethttp);

int main(int argc, char* argv[])
{
int device_fd = -1;
char msg[UEVENT_MSG_LEN+2];
int n;

device_fd = open_luther_gliethttp_socket();
printf("device_fd = %d\n", device_fd);

do {
while((n = recv(device_fd, msg, UEVENT_MSG_LEN, 0)) > 0) {
struct luther_gliethttp luther_gliethttp;

if(n == UEVENT_MSG_LEN)
continue;

msg[n] = '\0';
msg[n+1] = '\0';

parse_event(msg, &luther_gliethttp);
}
} while(1);
}

static int open_luther_gliethttp_socket(void)
{
struct sockaddr_nl addr;
int sz = 64*1024;
int s;

memset(&addr, 0, sizeof(addr));
addr.nl_family = AF_NETLINK;
addr.nl_pid = getpid();
addr.nl_groups = 0xffffffff;

s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
if (s < 0)
return -1;

setsockopt(s, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz));

if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
close(s);
return -1;
}

return s;
}

static void parse_event(const char *msg, struct luther_gliethttp *luther_gliethttp)
{
luther_gliethttp->action = "";
luther_gliethttp->path = "";
luther_gliethttp->subsystem = "";
luther_gliethttp->firmware = "";
luther_gliethttp->major = -1;
luther_gliethttp->minor = -1;

printf("========================================================\n");
while (*msg) {

printf("%s\n", msg);

if (!strncmp(msg, "ACTION=", 7)) {
msg += 7;
luther_gliethttp->action = msg;
} else if (!strncmp(msg, "DEVPATH=", 8)) {
msg += 8;
luther_gliethttp->path = msg;
} else if (!strncmp(msg, "SUBSYSTEM=", 10)) {
msg += 10;
luther_gliethttp->subsystem = msg;
} else if (!strncmp(msg, "FIRMWARE=", 9)) {
msg += 9;
luther_gliethttp->firmware = msg;
} else if (!strncmp(msg, "MAJOR=", 6)) {
msg += 6;
luther_gliethttp->major = atoi(msg);
} else if (!strncmp(msg, "MINOR=", 6)) {
msg += 6;
luther_gliethttp->minor = atoi(msg);
}

while(*msg++)
;
}

printf("event { '%s', '%s', '%s', '%s', %d, %d }\n",
luther_gliethttp->action, luther_gliethttp->path, luther_gliethttp->subsystem,
luther_gliethttp->firmware, luther_gliethttp->major, luther_gliethttp->minor);
}
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版权声明：本文为CSDN博主「luckywang1103」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/luckywang1103/article/details/50529534

来源：https://www.cnblogs.com/erhu-67786482/p/11792642.html