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Gave asynchronous operations approximate POSIX signal semantics. This

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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.
This commit is contained in:
Michael Brown
2007-01-15 08:49:10 +00:00
parent ec75b269d3
commit 4e20d73bb5
26 changed files with 656 additions and 248 deletions
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17
src/net/udp/dhcp.c
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@@ -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;
}