Update contrib/libs/c-ares to 1.34.2

commit_hash:abd65f143c484666e1545e6bbfb9d947df95ecd6

1 files changed, 95 insertions, 0 deletions

diff --git a/contrib/libs/c-ares/src/lib/util/ares_timeval.c b/contrib/libs/c-ares/src/lib/util/ares_timeval.c
new file mode 100644
index 0000000000..0b0845b6fb
--- /dev/null
+++ b/contrib/libs/c-ares/src/lib/util/ares_timeval.c
@@ -0,0 +1,95 @@
+/* MIT License
+ *
+ * Copyright (c) 2008 Daniel Stenberg
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include "ares_private.h"
+
+#if defined(_WIN32) && !defined(MSDOS)
+
+void ares_tvnow(ares_timeval_t *now)
+{
+  /* QueryPerformanceCounters() has been around since Windows 2000, though
+   * significant fixes were made in later versions.  Documentation states
+   * 1 microsecond or better resolution with a rollover not less than 100 years.
+   * This differs from GetTickCount{64}() which has a resolution between 10 and
+   * 16 ms. */
+  LARGE_INTEGER freq;
+  LARGE_INTEGER current;
+
+  /* Not sure how long it takes to get the frequency, I see it recommended to
+   * cache it */
+  QueryPerformanceFrequency(&freq);
+  QueryPerformanceCounter(&current);
+
+  now->sec = current.QuadPart / freq.QuadPart;
+  /* We want to prevent overflows so we get the remainder, then multiply to
+   * microseconds before dividing */
+  now->usec = (unsigned int)(((current.QuadPart % freq.QuadPart) * 1000000) /
+                             freq.QuadPart);
+}
+
+#elif defined(HAVE_CLOCK_GETTIME_MONOTONIC)
+
+void ares_tvnow(ares_timeval_t *now)
+{
+  /* clock_gettime() is guaranteed to be increased monotonically when the
+   * monotonic clock is queried. Time starting point is unspecified, it
+   * could be the system start-up time, the Epoch, or something else,
+   * in any case the time starting point does not change once that the
+   * system has started up. */
+  struct timespec tsnow;
+
+  if (clock_gettime(CLOCK_MONOTONIC, &tsnow) == 0) {
+    now->sec  = (ares_int64_t)tsnow.tv_sec;
+    now->usec = (unsigned int)(tsnow.tv_nsec / 1000);
+  } else {
+    /* LCOV_EXCL_START: FallbackCode */
+    struct timeval tv;
+    (void)gettimeofday(&tv, NULL);
+    now->sec  = (ares_int64_t)tv.tv_sec;
+    now->usec = (unsigned int)tv.tv_usec;
+    /* LCOV_EXCL_STOP */
+  }
+}
+
+#elif defined(HAVE_GETTIMEOFDAY)
+
+void ares_tvnow(ares_timeval_t *now)
+{
+  /* gettimeofday() is not granted to be increased monotonically, due to
+   * clock drifting and external source time synchronization it can jump
+   * forward or backward in time. */
+  struct timeval tv;
+
+  (void)gettimeofday(&tv, NULL);
+  now->sec  = (ares_int64_t)tv.tv_sec;
+  now->usec = (unsigned int)tv.tv_usec;
+}
+
+#else
+
+#  error missing sub-second time retrieval function
+
+#endif