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

  • BSD mandoc
     

    NAME

    
    
    g_read_data
    
     
    g_write_data
    
     - read/write data from/to GEOM consumer
    
     
    

    SYNOPSIS

       #include <geom/geom.h>
    void * Fo g_read_data Fa struct g_consumer *cp off_t offset off_t length int *error Fc Ft int Fo g_write_data Fa struct g_consumer *cp off_t offset void *ptr off_t length Fc  

    DESCRIPTION

    The g_read_data ();
    function reads Fa length bytes of data from the provider attached to consumer Fa cp , starting at offset Fa offset . The buffer returned from g_read_data ();
    is allocated with g_malloc (,);
    so it should be freed by the caller with g_free ();
    after use. If the operation fails, an error value will be stored in the Fa error argument if it is not NULL

    The g_write_data ();
    function writes Fa length bytes of data from the buffer pointed to by Fa ptr to the provider attached to consumer Fa cp , starting at offset Fa offset .  

    RESTRICTIONS/CONDITIONS

    The Fa length argument should be a multiple of the provider's sectorsize and less than or equal to DFLTPHYS ( DFLTPHYS is defined in In sys/param.h ) .

    The topology lock must not be held.  

    RETURN VALUES

    The g_read_data ();
    function returns a pointer to a data buffer or NULL if an error occurred. In that case an error value is stored in the Fa error argument unless it is NULL

    The g_write_data ();
    function returns 0 if successful; otherwise an error code is returned.  

    ERRORS

    Possible errors:

    Bq Er EIO
    An I/O error occurred while reading from or writing to the consumer.

     

    SEE ALSO

    geom(4), DECLARE_GEOM_CLASS9, g_access9, g_attach9, g_bio9, g_consumer9, g_event9, g_geom9, g_provider9, g_provider_by_name9, g_wither_geom9  

    AUTHORS

    An -nosplit This manual page was written by An Pawel Jakub Dawidek Aq [email protected] .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RESTRICTIONS/CONDITIONS
    RETURN VALUES
    ERRORS
    SEE ALSO
    AUTHORS


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