X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/eff2324504a9161166f095f4fe512a122da6854e..f9b6de55a6f3f3c53cee2fcb55935cbcb851a4f1:/src/instr/interface.c

diff --git a/src/instr/interface.c b/src/instr/interface.c
index 57157ce009..5e2e2193f6 100644
--- a/src/instr/interface.c
+++ b/src/instr/interface.c
@@ -16,15 +16,25 @@ static xbt_dict_t created_categories;
 
 int TRACE_start ()
 {
-	FILE *file = NULL;
+  if (!_TRACE_configured()){
+    THROW0 (tracing_error, TRACE_ERROR_START,
+            "TRACE_start should be called after SimGrid initialization functions.");
+    return 0;
+  }
+
   if (IS_TRACING) { /* what? trace is already active... ignore.. */
-	THROW0 (tracing_error, TRACE_ERROR_START,
-	        "TRACE_start called, but tracing is already active");
+    THROW0 (tracing_error, TRACE_ERROR_START,
+	         "TRACE_start called, but tracing is already active.");
     return 0;
   }
 
   char *filename = _TRACE_filename ();
-  file = fopen(filename, "w");
+  if (!filename){
+    THROW0 (tracing_error, TRACE_ERROR_START,
+            "Trace filename is not initialized.");
+    return 0;
+  }
+  FILE *file = fopen(filename, "w");
   if (!file) {
     THROW1 (tracing_error, TRACE_ERROR_START,
     		"Tracefile %s could not be opened for writing.", filename);