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10d0a1f8c7
request(), seek() or deliver_xxx() in order to start the data flow. Autonomous generators must be genuinely autonomous (having their own process), or otherwise arrange to be called. TCP does this by starting the retry timer immediately. Add some debugging statements.
76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <gpxe/refcnt.h>
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#include <gpxe/process.h>
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#include <gpxe/xfer.h>
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#include <gpxe/open.h>
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/** @file
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*
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* "Hello World" data source
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*
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*/
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struct hw {
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struct refcnt refcnt;
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struct xfer_interface xfer;
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struct process process;
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};
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static const char hw_msg[] = "Hello world!\n";
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static void hw_finished ( struct hw *hw, int rc ) {
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xfer_nullify ( &hw->xfer );
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xfer_close ( &hw->xfer, rc );
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process_del ( &hw->process );
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}
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static void hw_xfer_close ( struct xfer_interface *xfer, int rc ) {
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struct hw *hw = container_of ( xfer, struct hw, xfer );
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hw_finished ( hw, rc );
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}
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static struct xfer_interface_operations hw_xfer_operations = {
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.close = hw_xfer_close,
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.vredirect = ignore_xfer_vredirect,
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.request = ignore_xfer_request,
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.seek = ignore_xfer_seek,
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.deliver_iob = xfer_deliver_as_raw,
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.deliver_raw = ignore_xfer_deliver_raw,
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};
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static void hw_step ( struct process *process ) {
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struct hw *hw = container_of ( process, struct hw, process );
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int rc;
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if ( xfer_ready ( &hw->xfer ) == 0 ) {
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rc = xfer_deliver_raw ( &hw->xfer, hw_msg, sizeof ( hw_msg ) );
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hw_finished ( hw, rc );
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}
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}
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static int hw_open ( struct xfer_interface *xfer, struct uri *uri __unused ) {
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struct hw *hw;
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/* Allocate and initialise structure */
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hw = malloc ( sizeof ( *hw ) );
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if ( ! hw )
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return -ENOMEM;
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memset ( hw, 0, sizeof ( *hw ) );
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xfer_init ( &hw->xfer, &hw_xfer_operations, &hw->refcnt );
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process_init ( &hw->process, hw_step, &hw->refcnt );
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/* Attach parent interface, mortalise self, and return */
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xfer_plug_plug ( &hw->xfer, xfer );
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ref_put ( &hw->refcnt );
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return 0;
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}
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struct uri_opener hw_uri_opener __uri_opener = {
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.scheme = "hw",
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.open = hw_open,
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};
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