我试图udev在每次连接蓝牙设备时调用脚本。这是我到目前为止所做的。
我bluetooth.rules在 中创建了一个文件/etc/udev/rules.d。bluetooth.rules本身只包含一行：
SUBSYSTEM=="bluetooth", RUN+="/path/to/myscript"
我希望每次形成蓝牙连接时都会运行它和终止；问题是该脚本仅针对后一种情况调用，而不是前一种情况。
这是udevadm monitor形成连接时的输出（在我运行之后bluetoothctl connect <MAC address>）：
KERNEL[71481.889315] add /devices/pci0000:00/0000:00:14.0/usb3/3-11/3-11:1.0/bluetooth/hci0/hci0:256 (bluetooth)
UDEV [71481.903034] add /devices/pci0000:00/0000:00:14.0/usb3/3-11/3-11:1.0/bluetooth/hci0/hci0:256 (bluetooth)
KERNEL[71482.495175] add /devices/virtual/input/input45 (input)
KERNEL[71482.495248] add /devices/virtual/input/input45/event24 (input)
UDEV [71482.496423] add /devices/virtual/input/input45 (input)
UDEV [71482.591539] add /devices/virtual/input/input45/event24 (input)
此时设备已断开连接：
KERNEL[71553.849145] remove /devices/virtual/input/input45/event24 (input)
UDEV [71553.850872] remove /devices/virtual/input/input45/event24 (input)
KERNEL[71553.919022] remove /devices/virtual/input/input45 (input)
UDEV [71553.919624] remove /devices/virtual/input/input45 (input)
KERNEL[71556.168971] remove /devices/pci0000:00/0000:00:14.0/usb3/3-11/3-11:1.0/bluetooth/hci0/hci0:256 (bluetooth)
UDEV [71556.179602] remove /devices/pci0000:00/0000:00:14.0/usb3/3-11/3-11:1.0/bluetooth/hci0/hci0:256 (bluetooth)
这是运行后的结果udevadm info --attribute-walk --path：
$ udevadm info --attribute-walk --path=/devices/pci0000:00/0000:00:14.0/usb3/3-11/3-11:1.0/bluetooth/hci0/hci0:256
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device '/devices/pci0000:00/0000:00:14.0/usb3/3-11/3-11:1.0/bluetooth/hci0/hci0:256':
KERNEL=="hci0:256"
SUBSYSTEM=="bluetooth"
DRIVER==""
ATTR{power/control}=="auto"
ATTR{power/runtime_active_time}=="0"
ATTR{power/runtime_status}=="unsupported"
ATTR{power/runtime_suspended_time}=="0"
looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-11/3-11:1.0/bluetooth/hci0':
KERNELS=="hci0"
SUBSYSTEMS=="bluetooth"
DRIVERS==""
ATTRS{power/control}=="auto"
ATTRS{power/runtime_active_time}=="0"
ATTRS{power/runtime_status}=="unsupported"
ATTRS{power/runtime_suspended_time}=="0"
looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-11/3-11:1.0':
KERNELS=="3-11:1.0"
SUBSYSTEMS=="usb"
DRIVERS=="btusb"
ATTRS{authorized}=="1"
ATTRS{bAlternateSetting}==" 0"
ATTRS{bInterfaceClass}=="e0"
ATTRS{bInterfaceNumber}=="00"
ATTRS{bInterfaceProtocol}=="01"
ATTRS{bInterfaceSubClass}=="01"
ATTRS{bNumEndpoints}=="03"
ATTRS{supports_autosuspend}=="1"
looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3/3-11':
KERNELS=="3-11"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{authorized}=="1"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{bConfigurationValue}=="1"
ATTRS{bDeviceClass}=="e0"
ATTRS{bDeviceProtocol}=="01"
ATTRS{bDeviceSubClass}=="01"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{bMaxPower}=="100mA"
ATTRS{bNumConfigurations}=="1"
ATTRS{bNumInterfaces}==" 2"
ATTRS{bcdDevice}=="0001"
ATTRS{bmAttributes}=="e0"
ATTRS{busnum}=="3"
ATTRS{configuration}==""
ATTRS{devnum}=="6"
ATTRS{devpath}=="11"
ATTRS{idProduct}=="07dc"
ATTRS{idVendor}=="8087"
ATTRS{ltm_capable}=="no"
ATTRS{maxchild}=="0"
ATTRS{power/active_duration}=="63390"
ATTRS{power/autosuspend}=="2"
ATTRS{power/autosuspend_delay_ms}=="2000"
ATTRS{power/connected_duration}=="327300"
ATTRS{power/control}=="auto"
ATTRS{power/level}=="auto"
ATTRS{power/persist}=="1"
ATTRS{power/runtime_active_time}=="63920"
ATTRS{power/runtime_status}=="suspended"
ATTRS{power/runtime_suspended_time}=="263050"
ATTRS{power/wakeup}=="disabled"
ATTRS{power/wakeup_abort_count}==""
ATTRS{power/wakeup_active}==""
ATTRS{power/wakeup_active_count}==""
ATTRS{power/wakeup_count}==""
ATTRS{power/wakeup_expire_count}==""
ATTRS{power/wakeup_last_time_ms}==""
ATTRS{power/wakeup_max_time_ms}==""
ATTRS{power/wakeup_total_time_ms}==""
ATTRS{quirks}=="0x0"
ATTRS{removable}=="fixed"
ATTRS{remove}=="(not readable)"
ATTRS{rx_lanes}=="1"
ATTRS{speed}=="12"
ATTRS{tx_lanes}=="1"
ATTRS{urbnum}=="1227"
ATTRS{version}==" 2.00"
looking at parent device '/devices/pci0000:00/0000:00:14.0/usb3':
KERNELS=="usb3"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{authorized}=="1"
ATTRS{authorized_default}=="1"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{bConfigurationValue}=="1"
ATTRS{bDeviceClass}=="09"
ATTRS{bDeviceProtocol}=="01"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{bMaxPower}=="0mA"
ATTRS{bNumConfigurations}=="1"
ATTRS{bNumInterfaces}==" 1"
ATTRS{bcdDevice}=="0515"
ATTRS{bmAttributes}=="e0"
ATTRS{busnum}=="3"
ATTRS{configuration}==""
ATTRS{devnum}=="1"
ATTRS{devpath}=="0"
ATTRS{idProduct}=="0002"
ATTRS{idVendor}=="1d6b"
ATTRS{interface_authorized_default}=="1"
ATTRS{ltm_capable}=="no"
ATTRS{manufacturer}=="Linux 5.15.68-1-lts xhci-hcd"
ATTRS{maxchild}=="15"
ATTRS{power/active_duration}=="1310670"
ATTRS{power/autosuspend}=="0"
ATTRS{power/autosuspend_delay_ms}=="0"
ATTRS{power/connected_duration}=="71736870"
ATTRS{power/control}=="auto"
ATTRS{power/level}=="auto"
ATTRS{power/runtime_active_time}=="1309771"
ATTRS{power/runtime_status}=="suspended"
ATTRS{power/runtime_suspended_time}=="70427094"
ATTRS{power/wakeup}=="disabled"
ATTRS{power/wakeup_abort_count}==""
ATTRS{power/wakeup_active}==""
ATTRS{power/wakeup_active_count}==""
ATTRS{power/wakeup_count}==""
ATTRS{power/wakeup_expire_count}==""
ATTRS{power/wakeup_last_time_ms}==""
ATTRS{power/wakeup_max_time_ms}==""
ATTRS{power/wakeup_total_time_ms}==""
ATTRS{product}=="xHCI Host Controller"
ATTRS{quirks}=="0x0"
ATTRS{removable}=="unknown"
ATTRS{remove}=="(not readable)"
ATTRS{rx_lanes}=="1"
ATTRS{serial}=="0000:00:14.0"
ATTRS{speed}=="480"
ATTRS{tx_lanes}=="1"
ATTRS{urbnum}=="4538"
ATTRS{version}==" 2.00"
looking at parent device '/devices/pci0000:00/0000:00:14.0':
KERNELS=="0000:00:14.0"
SUBSYSTEMS=="pci"
DRIVERS=="xhci_hcd"
ATTRS{ari_enabled}=="0"
ATTRS{broken_parity_status}=="0"
ATTRS{class}=="0x0c0330"
ATTRS{consistent_dma_mask_bits}=="64"
ATTRS{d3cold_allowed}=="1"
ATTRS{device}=="0x8c31"
ATTRS{dma_mask_bits}=="64"
ATTRS{driver_override}=="(null)"
ATTRS{enable}=="1"
ATTRS{irq}=="30"
ATTRS{local_cpulist}=="0-7"
ATTRS{local_cpus}=="ff"
ATTRS{msi_bus}=="1"
ATTRS{msi_irqs/30}=="msi"
ATTRS{numa_node}=="-1"
ATTRS{power/control}=="on"
ATTRS{power/runtime_active_time}=="71737713"
ATTRS{power/runtime_status}=="active"
ATTRS{power/runtime_suspended_time}=="0"
ATTRS{power/wakeup}=="enabled"
ATTRS{power/wakeup_abort_count}=="0"
ATTRS{power/wakeup_active}=="0"
ATTRS{power/wakeup_active_count}=="0"
ATTRS{power/wakeup_count}=="0"
ATTRS{power/wakeup_expire_count}=="0"
ATTRS{power/wakeup_last_time_ms}=="0"
ATTRS{power/wakeup_max_time_ms}=="0"
ATTRS{power/wakeup_total_time_ms}=="0"
ATTRS{power_state}=="D0"
ATTRS{remove}=="(not readable)"
ATTRS{rescan}=="(not readable)"
ATTRS{resource0}=="(not readable)"
ATTRS{revision}=="0x04"
ATTRS{subsystem_device}=="0x2211"
ATTRS{subsystem_vendor}=="0x17aa"
ATTRS{vendor}=="0x8086"
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""
ATTRS{power/control}=="auto"
ATTRS{power/runtime_active_time}=="0"
ATTRS{power/runtime_status}=="unsupported"
ATTRS{power/runtime_suspended_time}=="0"
ATTRS{waiting_for_supplier}=="0"
调用的脚本并不算太复杂。它基本上是一个单行代码，包含一个pkill向另一个进程发送信号的调用。
我不明白为什么设备连接时没有调用该脚本
我的直觉告诉我，这与 udev 事件的顺序有关（根据udevadm monitor的输出，它似乎遵循 LIFO 模型），尽管我可能偏离了目标。
我缺少什么？