NeXT/netbuf.h

   1 /*
   2  * Copyright (C) 1990 by NeXT, Inc., All Rights Reserved
   3  *
   4  */
   5
   6 /*
   7  * Network Buffer API (for kernel use only)
   8  *
   9  * HISTORY
  10  * 09-Apr-90  Bradley Taylor (btaylor) at NeXT, Inc.
  11  *      Created.
  12  */
  13 #ifndef _NETBUF_
  14 #define _NETBUF_
  15
  16 /*
  17  * We know only that the first entry in the structure is a
  18  * pointer that isn't used while the netbuf is allocated.
  19  * (that is, until an nb_free() or an inet_queue() of course!)
  20  */
  21 typedef struct netbuf { struct netbuf *m_nextpkt; } *netbuf_t;
  22
  23 #ifdef KERNEL
  24
  25 extern char *nb_map(netbuf_t nb);
  26 extern netbuf_t nb_alloc(unsigned size);
  27 extern netbuf_t nb_alloc_wrapper(void *data, unsigned size,
  28                                  void freefunc(void *), void *freefunc_arg);
  29
  30 extern void nb_free(netbuf_t nb);
  31 extern void nb_free_wrapper(netbuf_t nb);
  32 extern unsigned nb_size(netbuf_t nb);
  33 extern int nb_read(netbuf_t nb, unsigned offset, unsigned size, void *target);
  34 extern int nb_write(netbuf_t nb, unsigned offset, unsigned size, void *source);
  35 extern int nb_shrink_top(netbuf_t nb, unsigned size);
  36 extern int nb_grow_top(netbuf_t nb, unsigned size);
  37 extern int nb_shrink_bot(netbuf_t nb, unsigned size);
  38 extern int nb_grow_bot(netbuf_t nb, unsigned size);
  39
  40 #endif /* KERNEL */
  41 #endif /* _NETBUF_ */