Linux程序开发要用到串口编程怎么样知道插入的USB设备是什么类型的设备
荷里活老耄 2009-10-28 03:36:45 Linux程序开发要用到串口编程怎么样知道插入的USB设备是什么类型的设备。
我下了个捕获内核发过来的netlink消息的程序,
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/un.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <linux/types.h>
#include <linux/netlink.h>
#include <errno.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#define UEVENT_BUFFER_SIZE 2048
static int init_hotplug_sock()
{
const int buffersize = 1024;
int ret;
struct sockaddr_nl snl;
bzero(&snl, sizeof(struct sockaddr_nl));
snl.nl_family = AF_NETLINK;
snl.nl_pid = getpid();
snl.nl_groups = 1;
int s = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
if (s == -1)
{
perror("socket");
return -1;
}
setsockopt(s, SOL_SOCKET, SO_RCVBUF, &buffersize, sizeof(buffersize));
ret = bind(s, (struct sockaddr *)&snl, sizeof(struct sockaddr_nl));
if (ret < 0)
{
perror("bind");
close(s);
return -1;
}
return s;
}
int main(int argc, char* argv[])
{
int hotplug_sock = init_hotplug_sock();
while(1)
{
/* Netlink message buffer */
char buf[UEVENT_BUFFER_SIZE * 2] = {0};
recv(hotplug_sock, &buf, sizeof(buf), 0);
printf("%s\n", buf);
/* USB 设备的插拔会出现字符信息,通过比较不同的信息确定特定设备的插拔,在这添加比较代码 */
}
return 0;
}
但是在插入两种不同的USB设备的时候,无法判别设备的类型。
下面是插入一种USB设备三次返回的结果
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1
add@/class/usb_endpoint/usbdev1.4_ep00
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0
add@/class/usb_endpoint/usbdev1.4_ep81
add@/class/usb_endpoint/usbdev1.4_ep01
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0/ttyUSB0
add@/class/tty/ttyUSB0
add@/class/usb_device/usbdev1.4
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1
add@/class/usb_endpoint/usbdev1.5_ep00
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0
add@/class/usb_endpoint/usbdev1.5_ep81
add@/class/usb_endpoint/usbdev1.5_ep01
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0/ttyUSB0
add@/class/tty/ttyUSB0
add@/class/usb_device/usbdev1.5
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1
add@/class/usb_endpoint/usbdev1.6_ep00
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0
add@/class/usb_endpoint/usbdev1.6_ep81
add@/class/usb_endpoint/usbdev1.6_ep01
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0/ttyUSB0
add@/class/tty/ttyUSB0
add@/class/usb_device/usbdev1.6
其中的usbdev1.4,usbdev1.5,usbdev1.6是不断累加的。
这是插入另外一种USB设备四次:
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1
add@/class/usb_endpoint/usbdev1.23_ep00
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0
add@/class/usb_endpoint/usbdev1.23_ep81
add@/class/usb_endpoint/usbdev1.23_ep01
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0/ttyUSB0
add@/class/tty/ttyUSB0
add@/class/usb_device/usbdev1.23
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1
add@/class/usb_endpoint/usbdev1.24_ep00
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0
add@/class/usb_endpoint/usbdev1.24_ep81
add@/class/usb_endpoint/usbdev1.24_ep01
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0/ttyUSB0
add@/class/tty/ttyUSB0
add@/class/usb_device/usbdev1.24
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1
add@/class/usb_endpoint/usbdev1.25_ep00
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0
add@/class/usb_endpoint/usbdev1.25_ep81
add@/class/usb_endpoint/usbdev1.25_ep01
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0/ttyUSB0
add@/class/tty/ttyUSB0
add@/class/usb_device/usbdev1.25
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1
add@/class/usb_endpoint/usbdev1.26_ep00
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0
add@/class/usb_endpoint/usbdev1.26_ep81
add@/class/usb_endpoint/usbdev1.26_ep01
add@/devices/pci0000:00/0000:00:11.0/0000:02:00.0/usb1/1-1/1-1:1.0/ttyUSB0
add@/class/tty/ttyUSB0
add@/class/usb_device/usbdev1.26