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mb_put_uint16le (9)
  • >> mb_put_uint16le (9) ( FreeBSD man: Ядро )

  • BSD mandoc
     

    NAME

    
    
    mbchain
    
     
    mb_init
    
     
    mb_initm
    
     
    mb_done
    
     
    mb_detach
    
     
    mb_fixhdr
    
     
    mb_reserve
    
     
    mb_put_uint8
    
     
    mb_put_uint16be
    
     
    mb_put_uint16le
    
     
    mb_put_uint32be
    
     
    mb_put_uint32le
    
     
    mb_put_int64be
    
     
    mb_put_int64le
    
     
    mb_put_mem
    
     
    mb_put_mbuf
    
     
    mb_put_uio
    
     - set of functions to build an mbuf chain from various data types
    
     
    

    SYNOPSIS

    options LIBMCHAIN kldload libmchain

       #include <sys/param.h>
       #include <sys/uio.h>
       #include <sys/mchain.h>
    int mb_init (struct mbchain *mbp);
    void mb_initm (struct mbchain *mbp struct mbuf *m);
    void mb_done (struct mbchain *mbp);
    struct mbuf * mb_detach (struct mbchain *mbp);
    int mb_fixhdr (struct mbchain *mbp);
    caddr_t mb_reserve (struct mbchain *mbp int size);
    int mb_put_uint8 (struct mbchain *mbp u_int8_t x);
    int mb_put_uint16be (struct mbchain *mbp u_int16_t x);
    int mb_put_uint16le (struct mbchain *mbp u_int16_t x);
    int mb_put_uint32be (struct mbchain *mbp u_int32_t x);
    int mb_put_uint32le (struct mbchain *mbp u_int32_t x);
    int mb_put_int64be (struct mbchain *mbp int64_t x);
    int mb_put_int64le (struct mbchain *mbp int64_t x);
    int mb_put_mem (struct mbchain *mbp c_caddr_t source int size int type);
    int mb_put_mbuf (struct mbchain *mbp struct mbuf *m);
    int mb_put_uio (struct mbchain *mbp struct uio *uiop int size);
     

    DESCRIPTION

    These functions are used to compose mbuf chains from various data types. The Vt mbchain structure is used as a working context and should be initialized with a call to either mb_init ();
    or mb_initm (.);
    It has the following fields:

    mb_top
    (Vt struct mbuf * ) A pointer to the top of constructed mbuf chain.
    mb_cur
    (Vt struct mbuf * ) A pointer to the currently filled mbuf.
    mb_mleft
    (Vt int ) Number of bytes left in the current mbuf.
    mb_count
    (Vt int ) Total number of bytes placed in the mbuf chain.
    mb_copy
    (Vt mb_copy_t * ) User-defined function to perform a copy into mbuf; useful if any unusual data conversion is necessary.
    mb_udata
    (Vt void * ) User-supplied data which can be used in the mb_copy function.

    mb_done ();
    function disposes an mbuf chain pointed to by Fa mbp->mb_top field and sets the field to NULL

    mb_detach ();
    function returns the value of Fa mbp->mb_top field and sets its value to NULL

    mb_fixhdr ();
    recalculates the length of an mbuf chain and updates the m_pkthdr.len field of the first mbuf in the chain. It returns the calculated length.

    mb_reserve ();
    ensures that the object of the length specified by the Fa size argument will fit in the current mbuf (mbuf allocation is performed if necessary), and advances all pointers as if the real data was placed. Returned value will point to the beginning of the reserved space. Note that the size of the object should not exceed MLEN bytes.

    All mb_put_ (*);
    functions perform an actual copy of the data into mbuf chain. Functions which have le or be suffixes will perform conversion to the little- or big-endian data formats.

    mb_put_mem ();
    function copies Fa size bytes of data specified by the Fa source argument to an mbuf chain. The Fa type argument specifies the method used to perform a copy, and can be one of the following:

    MB_MSYSTEM
    Use bcopy ();
    function.
    MB_MUSER
    Use copyin(9) function.
    MB_MINLINE
    Use an ``inline'' loop which does not call any function.
    MB_MZERO
    Do not copy any data, but just fill the destination with zero bytes.
    MB_MCUSTOM
    Call function specified by the Fa mbp->mb_copy field.

     

    RETURN VALUES

    All int functions except mb_fixhdr ();
    return zero if successful and an error code otherwise.

    Note after failure of any function, an mbuf chain is left in the broken state, and only mb_done ();
    function can safely be called to destroy it.  

    EXAMPLES

    struct mbchain *mbp;
    struct mbuf *m;
    
    mb_init(mbp);
    mb_put_uint8(mbp, 33);
    mb_put_uint16le(mbp, length);
    m = m_copym(mbp->mb_top, 0, M_COPYALL, M_TRYWAIT);
    send(m);
    mb_done(mbp);
    
     

    SEE ALSO

    mbuf(9), mdchain(9)  

    AUTHORS

    This manual page was written by An Boris Popov Aq bp@FreeBSD.org .


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUES
    EXAMPLES
    SEE ALSO
    AUTHORS


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