Gave asynchronous operations approximate POSIX signal semantics. This

will enable us to cascade async operations, which is necessary in order to
properly support DNS.  (For example, an HTTP request may have to redirect
to a new location and will have to perform a new DNS lookup, so we can't
just rely on doing the name lookup at the time of parsing the initial
URL).

Anything other than HTTP is probably broken right now; I'll fix the others
up asap.

1 files changed, 8 insertions, 9 deletions

diff --git a/src/net/udp/dhcp.c b/src/net/udp/dhcp.c
index 8f829701..a2d3db6b 100644
--- a/src/net/udp/dhcp.c
+++ b/src/net/udp/dhcp.c
@@ -517,7 +517,7 @@ static void dhcp_done ( struct dhcp_session *dhcp, int rc ) {
 	ref_del ( &dhcp->netdev_ref );
 
 	/* Mark async operation as complete */
-	async_done ( &dhcp->aop, rc );
+	async_done ( &dhcp->async, rc );
 }
 
 /** Address for transmitting DHCP requests */
@@ -713,14 +713,15 @@ static void dhcp_forget_netdev ( struct reference *ref ) {
  * Initiate DHCP on a network interface
  *
  * @v dhcp		DHCP session
- * @ret aop		Asynchronous operation
+ * @v parent		Parent asynchronous operation
+ * @ret rc		Return status code
  *
  * If the DHCP operation completes successfully, the
  * dhcp_session::options field will be filled in with the resulting
  * options block.  The caller takes responsibility for eventually
  * calling free_dhcp_options().
  */
-struct async_operation * start_dhcp ( struct dhcp_session *dhcp ) {
+int start_dhcp ( struct dhcp_session *dhcp, struct async *parent ) {
 	int rc;
 
 	/* Initialise DHCP session */
@@ -729,10 +730,8 @@ struct async_operation * start_dhcp ( struct dhcp_session *dhcp ) {
 	dhcp->state = DHCPDISCOVER;
 
 	/* Bind to local port */
-	if ( ( rc = udp_open ( &dhcp->udp, htons ( BOOTPC_PORT ) ) ) != 0 ) {
-		async_done ( &dhcp->aop, rc );
-		goto out;
-	}
+	if ( ( rc = udp_open ( &dhcp->udp, htons ( BOOTPC_PORT ) ) ) != 0 )
+		return rc;
 
 	/* Add persistent reference to net device */
 	dhcp->netdev_ref.forget = dhcp_forget_netdev;
@@ -741,6 +740,6 @@ struct async_operation * start_dhcp ( struct dhcp_session *dhcp ) {
 	/* Proof of concept: just send a single DHCPDISCOVER */
 	dhcp_send_request ( dhcp );
 
- out:
-	return &dhcp->aop;
+	async_init ( &dhcp->async, &default_async_operations, parent );
+	return 0;
 }