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register_chrdev (9)
  • >> register_chrdev (9) ( Linux man: Ядро )
  •  

    NAME

    register_chrdev, unregister_chrdev - register a driver major number
     
    

    SYNOPSIS

    #include <linux/fs.h>

    int register_chrdev(unsigned int major, const char*name, struct file_operations*ops);
    int unregister_chrdev(unsigned int major, const char *name);  

    DESCRIPTION

    The register_chrdev 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.

    The paramter major is the character major number assigned to the device driver and to be mapped to the function table. The name parameter is a short name for the device and is displayed in the The /proc/devices list. It also must exactly match the name passed to unregister_chrdev function when releasing the functions.

    A device driver module may register as many different major numbers as it supports, though this is not typically done.

    The unregister_chrdev function releases the major number, and is normally called in the module_cleanup function to remove the driver from the kernel.  

    RETURN VALUE

    On success, register_chrdev returns 0 if major is a number other then 0, otherwise Linux will choose a major number and return the chosen value.

    If there is an error, one of the following codes is returned instead:

    -EINVAL
    The specified number is not valid (> MAX_CHRDEV)
    -EBUSY
    The major number is busy

    The unregister_chrdev function will return 0 if successful, or -EINVAL if the major number is not registered with the matching name.  

    AVAILABILITY

    Linux 1.0+  

    SEE ALSO

    register_blkdev(9) mknod(2)  

    AUTHOR

    Stephen Williams (steve@icarus.com)  

    BUGS


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    AVAILABILITY
    SEE ALSO
    AUTHOR
    BUGS


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