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-rw-r--r--ares_timeout.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/ares_timeout.c b/ares_timeout.c
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+++ b/ares_timeout.c
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+/* Copyright 1998 by the Massachusetts Institute of Technology.
+ *
+ * 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.
+ */
+
+static const char rcsid[] = "$Id$";
+
+#include <sys/types.h>
+
+#ifdef WIN32
+
+#else
+#include <sys/time.h>
+#endif
+
+#include <time.h>
+#include "ares.h"
+#include "ares_private.h"
+
+struct timeval *ares_timeout(ares_channel channel, struct timeval *maxtv,
+ struct timeval *tvbuf)
+{
+ struct query *query;
+ time_t now;
+ int offset, min_offset;
+
+ /* No queries, no timeout (and no fetch of the current time). */
+ if (!channel->queries)
+ return maxtv;
+
+ /* Find the minimum timeout for the current set of queries. */
+ time(&now);
+ min_offset = -1;
+ for (query = channel->queries; query; query = query->next)
+ {
+ if (query->timeout == 0)
+ continue;
+ offset = query->timeout - now;
+ if (offset < 0)
+ offset = 0;
+ if (min_offset == -1 || offset < min_offset)
+ min_offset = offset;
+ }
+
+ /* If we found a minimum timeout and it's sooner than the one
+ * specified in maxtv (if any), return it. Otherwise go with
+ * maxtv.
+ */
+ if (min_offset != -1 && (!maxtv || min_offset <= maxtv->tv_sec))
+ {
+ tvbuf->tv_sec = min_offset;
+ tvbuf->tv_usec = 0;
+ return tvbuf;
+ }
+ else
+ return maxtv;
+}