kernel - /dev/video0 : invalid argument -

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Why I am not able to read this file. I tried to read this file with the cat: 

  cat / dev / video0   
 but it says  
 < Code> cat: / dev / video0: invalid argument   
 Similarly, if I try to use DD:  
  dd if = / Dev / video0 ~ / vid   
 It is still not able to read it.  
 Note that video0 is the tool file for my webcam.   
 
 
 I think the show function may be incorrect for the device node "video 0" created in your device is.  
 Give an example below  
  static DEVICE_ATTR (video 0, S_IRUGO | S_UUSR | S_IUGRP | S_Iwoth, video0_show, video0_store); Static ssize_t video0_show (structural device * dev, struct device_attribute * attr, char * buf); Static ssize_t video0_store (structural device * dev, struct device_attribute * attr, char * buf, size_t count);   
 When you cat the device node "Video 0" on the runtime, it calls the "video0_show" function to print something. The error message "cat: / dev / video0: invalid argument" means that the argument for the video0_show function is incorrect. You should debug the driver.

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