Detection of Uvent hotplug events from kernel, source code, test available

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


void Monitornetlinkuevent ()
{
int sockfd;
struct SOCKADDR_NL sa;
int Len;
Char buf[4096];
struct Iovec Iov;
struct MSGHDR msg;
int i;


memset (&sa,0,sizeof (SA));
Sa.nl_family=af_netlink;
Sa.nl_groups=netlink_kobject_uevent;
Sa.nl_pid = 0;//getpid (); Both is OK
memset (&msg,0,sizeof (msg));
iov.iov_base= (void *) buf;
Iov.iov_len=sizeof (BUF);
Msg.msg_name= (void *) &sa;
Msg.msg_namelen=sizeof (SA);
msg.msg_iov=&iov;
Msg.msg_iovlen=1;


Sockfd=socket (af_netlink,sock_raw,netlink_kobject_uevent);
if (sockfd==-1)
printf ("Socket creating failed:%s\n", Strerror (errno));
if (bind (SOCKFD, struct sockaddr *) &sa,sizeof (SA) ==-1)
printf ("Bind error:%s\n", Strerror (errno));


printf ("Begin to monitor evnet:\n");
while (1)
{
Len=recvmsg (sockfd,&msg,0);
if (len<0)
printf ("Receive error\n");
else if (len<32| | Len>sizeof (BUF))
printf ("Invalid message");
for (i=0;i<len;i++)
if (* (buf+i) = = ' = ')
Buf[i]= ' \ n ';
printf ("Received%d bytes\n%s\n", len,buf);
}
}


int main (int argc,char **argv)
{
Monitornetlinkuevent ();
return 0;
}

Insert U disk output log

-------------------------------------------------------------------------------------------------

[768.307008] ==11==> hub_port_init 1
[768.310661] Plug in USB Port3
[768.495004] USB 5-1: New high Speed USB device number 4 using mstar-ehci-3
[768.939901] USB 5-1: New USB device found, idvendor=0781, idproduct=5567
[768.946801] USB 5-1: New USB device Strings:mfr=1, product=2, serialnumber=3
[768.954111] USB 5-1: Product:cruzer Blade
[768.958276] USB 5-1: Manufacturer:sandisk
[768.962516] USB 5-1: serialnumber:20051233121175827626
Received bytes
add@/devices/platform/mstar-ehci-3.2/usb5/5-[768.973136] Scsi2:usb-storage 5-1:1.0
1
Action=add
devpath=/devices/platform/mstar-e[768.981426] SCSI 2:0:0:0: direct-access SanDisk Blade cruzer 1.26 ANSI: 5
Hci-3.2/usb5/5-1
Subsystem=usb
major=189
mino[768.994160] SD 2:0:0:0: [SDA] 15633408 512-byte logical blocks: (8.00 gb/7.45)
r=515
devname=bus/usb/005/004
[769.003400] SD 2:0:0:0: [SDA] Write Protect is off
devtype=usb_devi[769.010369] SD 2:0:0:0: [SDA] Write cache:disabled, read cache:enabled, doesn ' t support DPO or FUA
Ce
product=781/5567/126
type=0/0/0
busnum=005
devnum=004
se[769.024390] Emmc_partition ()
qnum=1019
=1018
C08isc06ip50
seqnum=1015


seqnum=1008


Received 275 bytes[769.034325] 0x0


add@/devices/p[769.037551] Sda:sda1
latform/mstar-ehci-3.2/usb5/5-1/5-1:1.0
Action=add
devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0
Subsystem=usb
Devtype=usb_interface
product=781/5567/126
type[769.056032] SD 2:0:0:0: [SDA] attached SCSI removable disk
=0/0/0
Interface=8/6/80
Modalias=usb:v0781p5567d0126dc00dsc00dp00ic08isc06ip50
seqnum=1020
=1015


seqnum=1008


Received 180 bytes
Add@/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2
Action=add
Devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2
Subsystem=scsi
Devtype=scsi_host
seqnum=1021
type=0/0/0
Interface=8/6/80
Modalias=usb:v0781p5567d0126dc00dsc00dp00ic08isc06ip50
seqnum=1020
=1015


seqnum=1008


Received 199 bytes
Add@/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/scsi_host/host2
Action=add
Devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/scsi_host/host2
Subsystem=scsi_host
seqnum=1022
E=8/6/80
Modalias=usb:v0781p5567d0126dc00dsc00dp00ic08isc06ip50
seqnum=1020
=1015


seqnum=1008


Received bytes
add@/devices/platform/mstar-ehci-3.2/usb5/5-1/usb_device/usbdev5.4
Action=add
devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/usb_device/usbdev5.4
Subsystem=usb_device
major=189
minor=515
devname=usbdev5.4
seqnum=1023
: V0781p5567d0126dc00dsc00dp00ic08isc06ip50
seqnum=1020
=1015


seqnum=1008


Received 206 bytes
add@/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0
Action=add
devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0
Subsystem=scsi
Devtype=scsi_target
seqnum=1024
4
seqnum=1023
: V0781p5567d0126dc00dsc00dp00ic08isc06ip50
seqnum=1020
=1015


seqnum=1008


Received 243 bytes
add@/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0
Action=add
devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0
Subsystem=scsi
Devtype=scsi_device
modalias=scsi:t-0x00
seqnum=1025
00dp00ic08isc06ip50
seqnum=1020
=1015


seqnum=1008


Received 243 bytes
add@/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0/scsi_disk/2:0:0:0
Action=add
devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0/scsi_disk/2:0:0:0
Subsystem=scsi_disk
seqnum=1026
00dp00ic08isc06ip50
seqnum=1020
=1015


seqnum=1008


Received 249 bytes
add@/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0/scsi_device/2:0:0:0
Action=add
devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0/scsi_device/2:0:0:0
Subsystem=scsi_device
seqnum=1027
Ic08isc06ip50
seqnum=1020
=1015


seqnum=1008


Received bytes
add@/devices/virtual/bdi/8:0
Action=add
devpath=/devices/virtual/bdi/8:0
Subsystem=bdi
seqnum=1028


Action=add
devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0/scsi_device/2:0:0:0
Subsystem=scsi_device
seqnum=1027
Ic08isc06ip50
seqnum=1020
=1015


seqnum=1008


Received 273 bytes
Add@/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0/block/sda
Action=add
Devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0/block/sda
Subsystem=block
Major=8
Minor=0
Devname=sda
Devtype=disk
Nparts=1
seqnum=1029
0
=1015


seqnum=1008


Received bytes
Add@/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0/block/sda/sda1
Action=add
Devpath=/devices/platform/mstar-ehci-3.2/usb5/5-1/5-1:1.0/host2/target2:0:0/2:0:0:0/block/sda/sda1
Subsystem=block
Major=8
Minor=1
Devname=sda1
Devtype=partition
Partn=1
seqnum=1030
=1008