Switch time() calls to monotonic clock calls (#7597)

[libt2n] / src / monotonic_clock.cpp

diff --git a/src/monotonic_clock.cpp b/src/monotonic_clock.cpp
new file mode 100644 (file)
index 0000000..3b4e720
--- /dev/null
+++ b/src/monotonic_clock.cpp
@@ -0,0 +1,56 @@
+/*
+Copyright (C) 2024 by Intra2net AG
+
+The software in this package is distributed under the GNU General
+Public License version 2 (with a special exception described below).
+
+A copy of GNU General Public License (GPL) is included in this distribution,
+in the file COPYING.GPL.
+
+As a special exception, if other files instantiate templates or use macros
+or inline functions from this file, or you compile this file and link it
+with other works to produce a work based on this file, this file
+does not by itself cause the resulting work to be covered
+by the GNU General Public License.
+
+However the source code for this file must still be made available
+in accordance with section (3) of the GNU General Public License.
+
+This exception does not invalidate any other reasons why a work based
+on this file might be covered by the GNU General Public License.
+*/
+
+#include <time.h>
+
+#include "monotonic_clock.hxx"
+
+/**
+ * @brief fetches the value from the monotonic clock source.
+ * @param[out] seconds the seconds.
+ * @param[out] nano_seconds the nano seconds.
+ * @return @a true if the clock was successfully read.
+ */
+bool monotonic_clock_gettime(long int& seconds, long int& nano_seconds)
+{
+    struct timespec tp[1];
+    int res= clock_gettime (CLOCK_MONOTONIC, tp);
+    if (0 == res)
+    {
+        seconds= tp->tv_sec;
+        nano_seconds= tp->tv_nsec;
+    }
+    return (res==0);
+}
+
+/**
+ * @brief fetches the value from the monotonic clock source.
+ * @return the time since system start in seconds, 0 if read was unsuccessful
+ */
+int monotonic_clock_gettime_sec()
+{
+    long int seconds=0;
+    long int nano_seconds;
+
+    monotonic_clock_gettime(seconds,nano_seconds);
+    return seconds;
+}