udev笔记

1.udevd的主配置文件是/etc/udev/udev.conf

2.使用udev来监听U的hot-plug事件

 #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>

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

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

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

     /* 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 < ) {
         printf("bind failed: %s", strerror(errno));
         close(hotplug_sock);
         hotplug_sock = -;
         return -;
     }

     return hotplug_sock;
 }

 #define UEVENT_BUFFER_SIZE 2048

 int main(int argc, char* argv[])
 {
      int hotplug_sock = init_hotplug_sock();

      while()
      {
            char buf[UEVENT_BUFFER_SIZE*] = {};
            recv(hotplug_sock, &buf, sizeof(buf), );
            printf("%s\n", buf);
      }

      return ;
 }

插上和拔出U盘打印：

add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0
add@/module/usb_storage
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/scsi_host/host33
add@/bus/usb/drivers/usb-storage
add@/module/uas
add@/bus/usb/drivers/uas
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/scsi_disk/33:0:0:0
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/scsi_device/33:0:0:0
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/scsi_generic/sg2
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/bsg/33:0:0:0
add@/devices/virtual/bdi/8:16
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/block/sdb
add@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/block/sdb/sdb1
add@/module/nls_iso8859_1

remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/bsg/33:0:0:0
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/scsi_generic/sg2
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/scsi_device/33:0:0:0
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/scsi_disk/33:0:0:0
change@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/block/sdb
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/block/sdb/sdb1
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0/block/sdb
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0/33:0:0:0
remove@/devices/virtual/bdi/8:16
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/target33:0:0
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33/scsi_host/host33
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0/host33
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1/1-1:1.0
remove@/devices/pci0000:00/0000:00:11.0/0000:02:03.0/usb1/1-1

3.利用udev更改网卡的名字

①通过ifconfig或者ubuntu:$ cat /sys/class/net/eth0/address来获得网卡的MAC地址：
00:0c:29:e1:b6:cd

②创建rules文件
/etc/udev/rules.d/my-network.rules
cat my-network.rules:
SUBSYSTEM=="net", ATTR{address}=="00:0c:29:e1:b6:cd", NAME="my-eth0"

然后重启，发现网卡名字从eth0变为my-eth0

参考：
http://blog.chinaunix.net/uid-30415354-id-5754794.html（没看完）