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io (4)
  • >> io (4) ( FreeBSD man: Специальные файлы /dev/* )
  • Ключ io обнаружен в базе ключевых слов.

  • BSD mandoc
     

    NAME

    
    
    io
    
     - I/O privilege file
    
     
    

    SYNOPSIS

    device io  

    DESCRIPTION

    The special file /dev/io is a controlled security hole that allows a process to gain I/O privileges (which are normally reserved for kernel-internal code). Any process that holds a file descriptor on /dev/io open will get its IOPL bits in the flag register set, thus allowing it to perform direct I/O operations. This can be useful in order to write userland programs that handle some hardware directly. Note that even read-only access will grant the full I/O privileges.

    In addition to any file access permissions on /dev/io the kernel enforces that only the super-user may open this device.  

    FILES

    /dev/io

     

    SEE ALSO

    i386_get_ioperm2, i386_set_ioperm2, mem(4)  

    HISTORY

    The file appeared in Fx 1.0 .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    FILES
    SEE ALSO
    HISTORY


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