ioops: make this zero-impact when compiling w/o zeroconf as well

This reduces the text size of the binary slightly when zeroconf
support is not built, and keeps the interface code cleaner as
well.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7133 09075e82-0dd4-0310-85a5-a0d7c8717e4f

1 files changed, 87 insertions, 0 deletions

diff --git a/src/ioops.c b/src/ioops.c
new file mode 100644
index 000000000..fde862b50
--- /dev/null
+++ b/src/ioops.c
@@ -0,0 +1,87 @@
+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com)
+ * This project's homepage is: http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "ioops.h"
+
+/* Eventually the listener protocol will use this, too */
+
+#ifdef HAVE_ZEROCONF
+
+/*
+ * functions and variables in this file are only used by a single thread and
+ * thus do not need to be thread-safe
+ */
+
+/* List of registered external IO handlers */
+static struct ioOps *ioList;
+
+/* Add fds for all registered IO handlers */
+void registered_IO_add_fds(int *fdmax,
+                           fd_set * rfds, fd_set * wfds, fd_set * efds)
+{
+	struct ioOps *o = ioList;
+
+	while (o) {
+		struct ioOps *current = o;
+		int fdnum;
+
+		assert(current->fdset);
+		fdnum = current->fdset(rfds, wfds, efds);
+		if (*fdmax < fdnum)
+			*fdmax = fdnum;
+		o = o->next;
+	}
+}
+
+/* Consume fds for all registered IO handlers */
+void registered_IO_consume_fds(int *selret,
+			       fd_set * rfds, fd_set * wfds, fd_set * efds)
+{
+	struct ioOps *o = ioList;
+
+	while (o) {
+		struct ioOps *current = o;
+
+		assert(current->consume);
+		*selret = current->consume(*selret, rfds, wfds, efds);
+		o = o->next;
+	}
+}
+
+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;
+}
+
+#endif /* HAVE_ZEROCONF */