[RPC] Add an uptime command that displays the amount of time that bitcoind has been running

src/util.cpp

@@ -84,6 +84,8 @@
 #include <openssl/rand.h>
 #include <openssl/conf.h>
 
+// Application startup time (used for uptime calculation)
+const int64_t nStartupTime = GetTime();
 
 const char * const BITCOIN_CONF_FILENAME = "bitcoin.conf";
 const char * const BITCOIN_PID_FILENAME = "bitcoind.pid";
@@ -889,3 +891,9 @@ std::string CopyrightHolders(const std::string& strPrefix)
     }
     return strCopyrightHolders;
 }
+
+// Obtain the application startup time (used for uptime calculation)
+int64_t GetStartupTime()
+{
+    return nStartupTime;
+}