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-rw-r--r--ares_getsock.c72
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+
+/* Copyright (C) 2005 - 2010, Daniel Stenberg
+ *
+ * Permission to use, copy, modify, and distribute this software and its
+ * documentation for any purpose and without fee is hereby granted, provided
+ * that the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation, and that the name of M.I.T. not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission. M.I.T. makes no representations about the
+ * suitability of this software for any purpose. It is provided "as is"
+ * without express or implied warranty.
+ */
+
+#include "ares_setup.h"
+
+#ifdef HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+
+#include "ares.h"
+#include "ares_private.h"
+
+int ares_getsock(ares_channel channel,
+ ares_socket_t *socks,
+ int numsocks) /* size of the 'socks' array */
+{
+ struct server_state *server;
+ int i;
+ int sockindex=0;
+ int bitmap = 0;
+ unsigned int setbits = 0xffffffff;
+
+ /* Are there any active queries? */
+ int active_queries = !ares__is_list_empty(&(channel->all_queries));
+
+ for (i = 0;
+ (i < channel->nservers) && (sockindex < ARES_GETSOCK_MAXNUM);
+ i++)
+ {
+ server = &channel->servers[i];
+ /* We only need to register interest in UDP sockets if we have
+ * outstanding queries.
+ */
+ if (active_queries && server->udp_socket != ARES_SOCKET_BAD)
+ {
+ if(sockindex >= numsocks)
+ break;
+ socks[sockindex] = server->udp_socket;
+ bitmap |= ARES_GETSOCK_READABLE(setbits, sockindex);
+ sockindex++;
+ }
+ /* We always register for TCP events, because we want to know
+ * when the other side closes the connection, so we don't waste
+ * time trying to use a broken connection.
+ */
+ if (server->tcp_socket != ARES_SOCKET_BAD)
+ {
+ if(sockindex >= numsocks)
+ break;
+ socks[sockindex] = server->tcp_socket;
+ bitmap |= ARES_GETSOCK_READABLE(setbits, sockindex);
+
+ if (server->qhead && active_queries)
+ /* then the tcp socket is also writable! */
+ bitmap |= ARES_GETSOCK_WRITABLE(setbits, sockindex);
+
+ sockindex++;
+ }
+ }
+ return bitmap;
+}