Linux Device Drivers Development

Generating ioctl numbers (command)

You should generate their own ioctl number in a dedicated header file. It is not mandatory, but it is recommended, since this header should be available in user space too. In other words, you should duplicate the ioctl header file so that there is one in the kernel and one in the user space, which you can include in user apps. Let's now generate ioctl numbers in a real example:

The eep_ioctl.h file is as follows:

#ifndef PACKT_IOCTL_H #define PACKT_IOCTL_H /* * We need to choose a magic number for our driver, and sequential numbers * for each command: */ #define EEP_MAGIC 'E' #define ERASE_SEQ_NO 0x01 #define RENAME_SEQ_NO 0x02 #define ClEAR_BYTE_SEQ_NO 0x03 #define GET_SIZE 0x04 /* * Partition name must ...