dargaud's questions

我有一个硬件设备，我想通过 HID 库在 C 中与之通信。但是此设备不会显示为 HID。有没有办法做到这一点（也许有 udev 规则）？

$ dmesg
usb 1-2: new full-speed USB device number 7 using xhci_hcd
usb 1-2: New USB device found, idVendor=104d, idProduct=3001
usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-2: Product: ESP301 Motion Control 
usb 1-2: Manufacturer: NEWPORT Corp.    
usb 1-2: SerialNumber: 0000000000000000

$ lsusb -v
Bus 001 Device 007: ID 104d:3001 Newport Corporation 
Device Descriptor:
bLength                18
bDescriptorType         1
bcdUSB               1.10
bDeviceClass          255 Vendor Specific Class
bDeviceSubClass         0 
bDeviceProtocol         0 
bMaxPacketSize0         8
idVendor           0x104d Newport Corporation
idProduct          0x3001 
bcdDevice            1.01
iManufacturer           1 NEWPORT Corp.    
iProduct                2 ESP301 Motion Control 
iSerial                 3 0000000000000000
bNumConfigurations      1
Configuration Descriptor:
 bLength                 9
 bDescriptorType         2
 wTotalLength           39
 bNumInterfaces          1
 bConfigurationValue     2
 iConfiguration          0 
 bmAttributes         0xa0
 (Bus Powered)
 Remote Wakeup
 MaxPower              100mA
 Interface Descriptor:
 bLength                 9
 bDescriptorType         4
 bInterfaceNumber        0
 bAlternateSetting       0
 bNumEndpoints           3
 bInterfaceClass       255 Vendor Specific Class
 bInterfaceSubClass      0 
 bInterfaceProtocol      0 
 iInterface              0 
 Endpoint Descriptor:
  bLength                 7
  bDescriptorType         5
  bEndpointAddress     0x81  EP 1 IN
  bmAttributes            2
  Transfer Type            Bulk
  Synch Type               None
  Usage Type               Data
  wMaxPacketSize     0x0040  1x 64 bytes
  bInterval               0
 Endpoint Descriptor:
  bLength                 7
  bDescriptorType         5
  bEndpointAddress     0x01  EP 1 OUT
  bmAttributes            2
  Transfer Type            Bulk
  Synch Type               None
  Usage Type               Data
  wMaxPacketSize     0x0040  1x 64 bytes
  bInterval               0
 Endpoint Descriptor:
  bLength                 7
  bDescriptorType         5
  bEndpointAddress     0x83  EP 3 IN
  bmAttributes            3
  Transfer Type            Interrupt
  Synch Type               None
  Usage Type               Data
  wMaxPacketSize     0x0002  1x 2 bytes
  bInterval               1
Device Status:     0x0001
Self Powered

我很确定很久以前在某些同事系统上看到了这种对 less 命令的定制，以模仿“更多”。我想要的是：

• 如果文件很短（不到一屏长），它的行为应该像 cat：它显示文件的内容并退出。

• 如果文件长于一个屏幕，它应该像往常一样运行，等待用户输入并在退出时清除其屏幕并将先前的命令留在屏幕上。

我尝试过使用 less -FX 进行试验，但它会在屏幕上为大文件留下大量内容。