Added zeroconf service publishing using avahi

git-svn-id: https://svn.musicpd.org/mpd/trunk@5238 09075e82-0dd4-0310-85a5-a0d7c8717e4f

src/interface.c

@@ -26,6 +26,7 @@
 #include "permission.h"
 #include "sllist.h"
 #include "utils.h"
+#include "ioops.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -62,6 +63,9 @@ static size_t interface_max_command_list_size =
 static size_t interface_max_output_buffer_size =
     INTERFACE_MAX_OUTPUT_BUFFER_SIZE_DEFAULT;
 
+/* List of registered external IO handlers */
+static struct ioOps *ioList;
+
 /* maybe make conf option for this, or... 32 might be good enough */
 static long int interface_list_cache_size = 32;
 
@@ -488,6 +492,7 @@ int doIOForInterfaces(void)
 {
 	fd_set rfds;
 	fd_set wfds;
+	fd_set efds;
 	struct timeval tv;
 	int i;
 	int selret;
@@ -499,12 +504,43 @@ int doIOForInterfaces(void)
 	while (1) {
 		fdmax = 0;
 
+		FD_ZERO( &rfds );
+		FD_ZERO( &wfds );
+		FD_ZERO( &efds );
 		addInterfacesReadyToReadAndListenSocketToFdSet(&rfds, &fdmax);
 		addInterfacesForBufferFlushToFdSet(&wfds, &fdmax);
 
-		selret = select(fdmax + 1, &rfds, &wfds, NULL, &tv);
+		// Add fds for all registered IO handlers
+		if( ioList ) {
+			struct ioOps *i = ioList;
+			while( i ) {
+				struct ioOps *current = i;
+				int fdnum;
+				assert( current->fdset );
+				fdnum = current->fdset( &rfds, &wfds, &efds );
+				if( fdmax < fdnum )
+					fdmax = fdnum;
+				i = i->next;
+			}
+		}
 
-		if (selret == 0 || (selret < 0 && errno == EINTR))
+		selret = select(fdmax + 1, &rfds, &wfds, &efds, &tv);
+
+		if (selret < 0 && errno == EINTR)
+			break;
+
+		// Consume fds for all registered IO handlers
+		if( ioList ) {
+			struct ioOps *i = ioList;
+			while( i ) {
+				struct ioOps *current = i;
+				assert( current->consume );
+				selret = current->consume( selret, &rfds, &wfds, &efds );
+				i = i->next;
+			}
+		}
+
+		if (selret == 0)
 			break;
 
 		if (selret < 0) {
@@ -794,3 +830,25 @@ static void printInterfaceOutBuffer(Interface * interface)
 
 	interface->send_buf_used = 0;
 }
+
+// From ioops.h:
+void registerIO( struct ioOps *ops )
+{
+	assert( ops != NULL );
+
+	ops->next = ioList;
+	ioList = ops;
+	ops->prev = NULL;
+	if( ops->next )
+		ops->next->prev = ops;
+}
+
+void deregisterIO( struct ioOps *ops )
+{
+	assert( ops != NULL );
+
+	if( ioList == ops )
+		ioList = ops->next;
+	else if( ops->prev != NULL )
+		ops->prev->next = ops->next;
+}