Rename and export MaxScaleUptime()

MaxScaleUptime() renamed to maxscale_uptime() and moved from
gateway.c (MaxScale main) to misc.c, which is included in the
maxscale_common library. That way the symbol will be available
at link-time and will thus not prevent the use of the linker
flags -Wl,-z,defs (resolve all symbols at link-time) when
linking a module that uses maxscale_uptime().

server/core/CMakeLists.txt

@@ -1,4 +1,4 @@
-add_library(maxscale-common SHARED adminusers.c atomic.c buffer.c config.c dbusers.c dcb.c filter.c externcmd.c gwbitmask.c gwdirs.c gw_utils.c hashtable.c hint.c housekeeper.c load_utils.c log_manager.cc maxscale_pcre2.c memlog.c mlist.c modutil.c monitor.c query_classifier.c poll.c random_jkiss.c resultset.c secrets.c server.c service.c session.c slist.c spinlock.c thread.c users.c utils.c ${CMAKE_SOURCE_DIR}/utils/skygw_utils.cc statistics.c)
+add_library(maxscale-common SHARED adminusers.c atomic.c buffer.c config.c dbusers.c dcb.c filter.c externcmd.c gwbitmask.c gwdirs.c gw_utils.c hashtable.c hint.c housekeeper.c load_utils.c log_manager.cc maxscale_pcre2.c memlog.c misc.c mlist.c modutil.c monitor.c query_classifier.c poll.c random_jkiss.c resultset.c secrets.c server.c service.c session.c slist.c spinlock.c thread.c users.c utils.c ${CMAKE_SOURCE_DIR}/utils/skygw_utils.cc statistics.c)
 
 target_link_libraries(maxscale-common ${MARIADB_CONNECTOR_LIBRARIES} ${LZMA_LINK_FLAGS} ${PCRE2_LIBRARIES} ${CURL_LIBRARIES} ssl aio pthread crypt dl crypto inih z rt m stdc++)
 

server/core/gateway.c

@@ -99,8 +99,6 @@
 #  define _GNU_SOURCE
 #endif
 
-time_t  MaxScaleStarted;
-
 extern char *program_invocation_name;
 extern char *program_invocation_short_name;
 
@@ -1293,6 +1291,8 @@ int main(int argc, char **argv)
     *maxlog_enabled = 1;
     *log_to_shm = 0;
 
+    maxscale_reset_uptime();
+
     sigemptyset(&sigpipe_mask);
     sigaddset(&sigpipe_mask, SIGPIPE);
     progname = *argv;
@@ -1967,7 +1967,6 @@ int main(int argc, char **argv)
     if (daemon_mode)
         write_child_exit_code(daemon_pipe[1], rc);
 
-    MaxScaleStarted = time(0);
     /*<
      * Serve clients.
      */
@@ -2298,12 +2297,6 @@ static int write_pid_file() {
     return 0;
 }
 
-int
-MaxScaleUptime()
-{
-    return time(0) - MaxScaleStarted;
-}
-
 bool handle_path_arg(char** dest, char* path, char* arg, bool rd, bool wr)
 {
     char pathbuffer[PATH_MAX+2];

server/core/misc.c

@@ -0,0 +1,41 @@
+/*
+ * This file is distributed as part of the MariaDB Corporation MaxScale. It is free
+ * software: you can redistribute it and/or modify it under the terms of the
+ * GNU General Public License as published by the Free Software Foundation,
+ * version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Copyright MariaDB Corporation Ab 2016
+ *
+ */
+
+#include <maxscale.h>
+#include <time.h>
+
+static time_t maxscale_started;
+
+/**
+ * Reset the start time from which the uptime is calculated.
+ */
+void maxscale_reset_uptime(void)
+{
+    maxscale_started = time(0);
+}
+
+/**
+ * Return the time MaxScale has been running.
+ *
+ * @return The uptime in seconds.
+ */
+int maxscale_uptime()
+{
+    return time(0) - maxscale_started;
+}

server/include/maxscale.h

@@ -40,4 +40,8 @@
 #define MAXSCALE_ALREADYRUNNING	4	/* MaxScale is already runing */
 #define MAXSCALE_BADARG		5	/* Bad command line argument */
 #define MAXSCALE_INTERNALERROR	6	/* Internal error, see error log */
+
+void maxscale_reset_uptime(void);
+int maxscale_uptime(void);
+
 #endif