NAME<\/a> register_chrdev, unregister_chrdev \u2212 register a driver major number<\/p>\n #include int register_chrdev(unsigned int<\/b> major<\/i>, const char*<\/b>name<\/i>, struct file_operations*<\/b>ops<\/i>); The register_chrdev<\/b> function associates a character major number with set of driver entry points. The file_operations structure contains pointers to functions that the the driver uses to implement the kernel interface to the driver.<\/p>\n The paramter major<\/i> is the character major number assigned to the device driver and to be mapped to the function table. The name<\/i> parameter is a short name for the device and is displayed in the The \/proc\/devices<\/i> list. It also must exactly match the name passed to unregister_chrdev<\/b> function when releasing the functions.<\/p>\n A device driver module may register as many different major numbers as it supports, though this is not typically done.<\/p>\n The unregister_chrdev<\/b> function releases the major number, and is normally called in the module_cleanup function to remove the driver from the kernel.<\/p>\n On success, register_chrdev<\/b> returns 0 if major<\/i> is a number other then 0, otherwise Linux will choose a major number and return the chosen value.<\/p>\n If there is an error, one of the following codes is returned instead:<\/p>\n -EINVAL<\/p>\n The specified number is not valid (> MAX_CHRDEV)<\/p>\n
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\nNAME <\/a> <\/h2>\n
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int unregister_chrdev(unsigned int<\/b> major<\/i>, const char *<\/b>name<\/i>);<\/b><\/p>\nDESCRIPTION <\/a> <\/h2>\n
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