Linux 应用层检测USB转串口设备热插拔事件程序

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利用NETLINK检测USB热插拔的C语言实现代码如下：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <pthread.h>
#define UEVENT_BUFFER_SIZE 2048

static int init_hotplug_sock(void)
{
   struct sockaddr_nl snl;
   const int buffersize = 16 * 1024 * 1024;
   int retval;

   memset(&snl, 0x00, sizeof(struct sockaddr_nl));
   snl.nl_family = AF_NETLINK;
   snl.nl_pid = getpid();
   snl.nl_groups = 1;

   int hotplug_sock = socket(PF_NETLINK, SOCK_RAW, NETLINK_KOBJECT_UEVENT);
   if (hotplug_sock == -1) {
       printf("error getting socket: %s", strerror(errno));
       return -1;
   }

   /* set receive buffersize */
   setsockopt(hotplug_sock, SOL_SOCKET, SO_RCVBUFFORCE, &buffersize, sizeof(buffersize));
   retval = bind(hotplug_sock, (struct sockaddr *) &snl, sizeof(struct sockaddr_nl));
   if (retval < 0) {
       printf("bind failed: %s", strerror(errno));
       close(hotplug_sock);
       hotplug_sock = -1;
       return -1;
   }
   return hotplug_sock;
}
unsigned char getHotPlugPort(char *buf)
{
   unsigned char portNum = 0xff;
   if (strstr(buf, "/usb5/5-1/5-1.5") != NULL)
   {
       portNum = 5;
   }
   else if (strstr(buf, "/usb5/5-1/5-1.4") != NULL)
   {
       portNum = 4;
   }
   else if (strstr(buf, "/usb5/5-1/5-1.3") != NULL)
   {
       portNum = 3;
   }
   else if (strstr(buf, "/usb5/5-1/5-1.2") != NULL)
   {
       portNum = 2;
   }
   else if (strstr(buf, "/usb5/5-1/5-1.1") != NULL)
   {
       portNum = 1;
   }
   else if (strstr(buf, "/usb5/3-1/3-1.1") != NULL)
   {
       portNum = 6;
   }
   return portNum;
}
void HotPlugThread(void)
{
   struct timeval tv;
   fd_set fds;
   int rcvlen, ret,type=0,portNum=0;
   int hotplug_sock = init_hotplug_sock();
   printf("HotPlugthread start \n");
   while (1)
   {
       //printf("sunqidong debug\n");
       char buf[UEVENT_BUFFER_SIZE * 2] = { 0 };
       FD_ZERO(&fds);
       FD_SET(hotplug_sock, &fds);
       tv.tv_sec = 0;
       tv.tv_usec = 100 * 1000;
       ret = select(hotplug_sock + 1, &fds, NULL, NULL, &tv);
       if (ret < 0)
           continue;
       if (!(ret > 0 && FD_ISSET(hotplug_sock, &fds)))
           continue;
       /* receive data */
       rcvlen = recv(hotplug_sock, &buf, sizeof(buf), 0);
       if (rcvlen > 0) {
           if (strstr(buf, "add") != NULL)
           {
               portNum = getHotPlugPort((char*)&buf);
               type = 1;
           }else if (strstr(buf, "remove") != NULL)
           {
               portNum = getHotPlugPort((char*)&buf);
               type = 0;
           }
           //printf("hotplug receive portNum = %d\n", portNum);
           if ((portNum >= 1) && (portNum <= 6))
           {
               if (type == 0)
               {
                   printf("hotplug remove portNum = %d\n", portNum);
               }
               else
               {
                   printf("hotplug add portNum = %d\n", portNum);
               }
           }
           /*You can do something here to make the program more perfect!!!*/
       }
   }
}