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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 
hw_finished(struct hw * hw,int rc)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 
hw_xfer_close(struct xfer_interface * xfer,int rc)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 	.window		= unlimited_xfer_window,
40 	.alloc_iob	= default_xfer_alloc_iob,
41 	.deliver_iob	= xfer_deliver_as_raw,
42 	.deliver_raw	= ignore_xfer_deliver_raw,
43 };
44 
hw_step(struct process * process)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 
hw_open(struct xfer_interface * xfer,struct uri * uri __unused)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 };
75