src/core/hw.c

   1 #include <stddef.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <errno.h>
   5 #include <gpxe/refcnt.h>
   6 #include <gpxe/process.h>
   7 #include <gpxe/xfer.h>
   8 #include <gpxe/open.h>
   9
  10 /** @file
  11  *
  12  * "Hello World" data source
  13  *
  14  */
  15
  16 struct hw {
  17         struct refcnt refcnt;
  18         struct xfer_interface xfer;
  19         struct process process;
  20 };
  21
  22 static const char hw_msg[] = "Hello world!\n";
  23
  24 static void hw_finished ( struct hw *hw, int rc ) {
  25         xfer_nullify ( &hw->xfer );
  26         xfer_close ( &hw->xfer, rc );
  27         process_del ( &hw->process );
  28 }
  29
  30 static void hw_xfer_close ( struct xfer_interface *xfer, int rc ) {
  31         struct hw *hw = container_of ( xfer, struct hw, xfer );
  32
  33         hw_finished ( hw, rc );
  34 }
  35
  36 static struct xfer_interface_operations hw_xfer_operations = {
  37         .close          = hw_xfer_close,
  38         .vredirect      = ignore_xfer_vredirect,
  39         .seek           = ignore_xfer_seek,
  40         .window         = unlimited_xfer_window,
  41         .deliver_iob    = xfer_deliver_as_raw,
  42         .deliver_raw    = ignore_xfer_deliver_raw,
  43 };
  44
  45 static void hw_step ( struct process *process ) {
  46         struct hw *hw = container_of ( process, struct hw, process );
  47         int rc;
  48
  49         if ( xfer_window ( &hw->xfer ) ) {
  50                 rc = xfer_deliver_raw ( &hw->xfer, hw_msg, sizeof ( hw_msg ) );
  51                 hw_finished ( hw, rc );
  52         }
  53 }
  54
  55 static int hw_open ( struct xfer_interface *xfer, struct uri *uri __unused ) {
  56         struct hw *hw;
  57
  58         /* Allocate and initialise structure */
  59         hw = zalloc ( sizeof ( *hw ) );
  60         if ( ! hw )
  61                 return -ENOMEM;
  62         xfer_init ( &hw->xfer, &hw_xfer_operations, &hw->refcnt );
  63         process_init ( &hw->process, hw_step, &hw->refcnt );
  64
  65         /* Attach parent interface, mortalise self, and return */
  66         xfer_plug_plug ( &hw->xfer, xfer );
  67         ref_put ( &hw->refcnt );
  68         return 0;
  69 }
  70
  71 struct uri_opener hw_uri_opener __uri_opener = {
  72         .scheme = "hw",
  73         .open = hw_open,
  74 };