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device_is_alive (9)
  • >> device_is_alive (9) ( FreeBSD man: Ядро )

  • BSD mandoc
     

    NAME

    
    
    device_get_state
    
     
    device_busy
    
     
    device_unbusy
    
     
    device_is_alive
    
     
    device_is_attached
    
     - manipulate device state
    
     
    

    SYNOPSIS

       #include <sys/param.h>
       #include <sys/bus.h>
    device_state_t device_get_state (device_t dev);
    void device_busy (device_t dev);
    void device_unbusy (device_t dev);
    int device_is_alive (device_t dev);
    int device_is_attached (device_t dev);
     

    DESCRIPTION

    The current state of a device is accessed by calling device_get_state ();
    which returns DS_NOTPRESENT DS_ALIVE DS_ATTACHED or DS_BUSY (described in device(9)). To test see if a device was successfully probed, call device_is_alive ();
    which simply returns if the state is greater or equal to DS_ALIVE To test see if a device was successfully attached, call device_is_attached ();
    which simply returns if the state is greater or equal to DS_ATTACHED

    Each device has a busy count which is incremented when device_busy ();
    is called and decremented when device_unbusy ();
    is called. Both routines return an error if the device state is less than DS_ATTACHED

    When device_busy ();
    is called on a device in the DS_ATTACHED state, the device changes to the DS_BUSY state. When device_unbusy ();
    is called and after decrementing, the busy count for the device is zero, the device changes to the DS_ATTACHED state.  

    SEE ALSO

    device(9)  

    AUTHORS

    This manual page was written by An Doug Rabson .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    SEE ALSO
    AUTHORS


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