Fixed HC crash on docker (bug 558427)

Change-Id: I1351ae3146a7f389ca3752f7f3fba1751a95e598
Signed-off-by: Botond Baranyi <botond.baranyi@ericsson.com>

core/Logger.cc

@@ -458,6 +458,11 @@ char *TTCN_Logger::mputstr_timestamp(char *str,
     time_t tv_sec = tv->tv_sec;
     struct tm *lt = localtime(&tv_sec);
     if (lt == NULL) fatal_error("localtime() call failed.");
+    if (errno != 0) {
+      // HACK: 'localtime' may set the 'errno' on some systems (even though it
+      // succeeds); make sure this doesn't affect other code
+      errno = 0;
+    }
     if (p_timestamp_format == TIMESTAMP_TIME) {
       str = mputprintf(str, "%02d:%02d:%02d.%06ld",
                        lt->tm_hour, lt->tm_min, lt->tm_sec, tv->tv_usec);

core/Runtime.cc

@@ -3019,7 +3019,6 @@ void TTCN_Runtime::wait_terminated_processes()
   // this function might be called from TCs too while returning from
   // TTCN_Communication::process_all_messages_hc() after fork()
   if (!is_hc()) return;
-  errno = 0;
   for ( ; ; ) {
     int statuscode;
 #ifdef __clang__
@@ -3028,6 +3027,7 @@ void TTCN_Runtime::wait_terminated_processes()
     struct rusage r_usage = {{0,0},{0,0},0,0,0,0,0,0,0,0,0,0,0,0,0,0};
 #endif
 
+    errno = 0;
 #ifdef INTERIX
     pid_t child_pid = waitpid(-1, &statuscode, WNOHANG);
     getrusage(RUSAGE_CHILDREN, &r_usage);