[libudev] is there a function to filter message from kernel with property and value

Hi

 

Need your kind help for one question!

 

Do libudev have a function that could be used to filter the message with property from kernel socket?

 

I am writing an APPs like “udevadm monitor”.

 

I see the function “udev_monitor_filter_add_match_subsystem_devtype()” could filter the devtype for the message.

 

And I see the “udev_monitor_filter_add_match_tag” could filter the tag. (But I don’t know how does it work)

 

When I use “udevadm monitor --subsystem-match=pci --env” command, I could see some messages from kernel like below.

 

For example, I only want the messages contains “property=value” like “PCI_ID=8086:4941” could come up from kernel space.

 

Could you please shed a light on this?

 

################################################################################################################################################

KERNEL[76915.968785] bind     /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/ec21a818-5106-49c3-a6f6-e4cb872df440/pci5106:00/5106:00:00.0 (pci)

ACTION="">

DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/ec21a818-5106-49c3-a6f6-e4cb872df440/pci5106:00/5106:00:00.0

SUBSYSTEM=pci

DRIVER=4xxxvf

PCI_CLASS=B4000

PCI_ID=8086:4941

PCI_SUBSYS_ID=8086:0000

PCI_SLOT_NAME=5106:00:00.0

MODALIAS=pci:v00008086d00004941sv00008086sd00000000bc0Bsc40i00

SEQNUM=5527

 

UDEV  [76915.974190] change   /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/ec21a818-5106-49c3-a6f6-e4cb872df440/pci5106:00/5106:00:00.0 (pci)

ACTION="">

DEVPATH=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A03:00/device:07/VMBUS:01/ec21a818-5106-49c3-a6f6-e4cb872df440/pci5106:00/5106:00:00.0

SUBSYSTEM=pci

qat_event=restarted

accelid=0

DRIVER=4xxxvf

PCI_CLASS=B4000

PCI_ID=8086:4941

PCI_SUBSYS_ID=8086:0000

PCI_SLOT_NAME=5106:00:00.0

MODALIAS=pci:v00008086d00004941sv00008086sd00000000bc0Bsc40i00

SEQNUM=5526

USEC_INITIALIZED=76915555086

ID_PCI_CLASS_FROM_DATABASE=Processor

ID_PCI_SUBCLASS_FROM_DATABASE=Co-processor

ID_VENDOR_FROM_DATABASE=Intel Corporation

################################################################################################################################################

 

 

- Yuan