hw.c

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#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ipxe/refcnt.h>
#include <ipxe/process.h>
#include <ipxe/xfer.h>
#include <ipxe/open.h>

/** @file
 *
 * "Hello World" data source
 *
 */

struct hw {
        struct refcnt refcnt;
        struct interface xfer;
        struct process process;
};

static const char hw_msg[] = "Hello world!\n";

static void hw_finished ( struct hw *hw, int rc ) {
        intf_shutdown ( &hw->xfer, rc );
        process_del ( &hw->process );
}

static void hw_step ( struct hw *hw ) {
        int rc;

        if ( xfer_window ( &hw->xfer ) ) {
                rc = xfer_deliver_raw ( &hw->xfer, hw_msg, sizeof ( hw_msg ) );
                hw_finished ( hw, rc );
        }
}

static struct interface_operation hw_xfer_operations[] = {
        INTF_OP ( xfer_window_changed, struct hw *, hw_step ),
        INTF_OP ( intf_close, struct hw *, hw_finished ),
};

static struct interface_descriptor hw_xfer_desc =
        INTF_DESC ( struct hw, xfer, hw_xfer_operations );

static struct process_descriptor hw_process_desc =
        PROC_DESC_ONCE ( struct hw, process, hw_step );

static int hw_open ( struct interface *xfer, struct uri *uri __unused ) {
        struct hw *hw;

        /* Allocate and initialise structure */
        hw = zalloc ( sizeof ( *hw ) );
        if ( ! hw )
                return -ENOMEM;
        ref_init ( &hw->refcnt, NULL );
        intf_init ( &hw->xfer, &hw_xfer_desc, &hw->refcnt );
        process_init ( &hw->process, &hw_process_desc, &hw->refcnt );

        /* Attach parent interface, mortalise self, and return */
        intf_plug_plug ( &hw->xfer, xfer );
        ref_put ( &hw->refcnt );
        return 0;
}

struct uri_opener hw_uri_opener __uri_opener = {
        .scheme = "hw",
        .open = hw_open,
};