After successful recovery, already existing output files are opened

in append mode (and not truncated as it was before) to keep the old data.

Note that there may exist multiple data entries for the same timestep now
if the restart from recovery is earlier than the last timestep of the output.
You'll see that in gnuplot and xgraph as a straight line.


git-svn-id: http://svn.cactuscode.org/arrangements/CactusBase/IOBasic/trunk@49 b589c3ab-70e8-4b4d-a09f-cba2dd200880

1 files changed, 12 insertions, 3 deletions

diff --git a/src/WriteGF.c b/src/WriteGF.c
index 2e7e073..73be217 100644
--- a/src/WriteGF.c
+++ b/src/WriteGF.c
@@ -15,15 +15,18 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>    /* access(2) */
 
 #include "cctk.h"
 #include "cctk_Parameters.h"
+#include "CactusBase/IOUtil/src/ioGH.h"
 #include "iobasicGH.h"
 
 void IOBasic_WriteGF (cGH *GH, int index, const char *alias)
 {
   DECLARE_CCTK_PARAMETERS
   int i;
+  ioGH *ioUtilGH;
   iobasicGH *myGH;
   FILE *file;
   char *openmode;
@@ -69,6 +72,7 @@ void IOBasic_WriteGF (cGH *GH, int index, const char *alias)
   else
     title_start_char = 34;         /* this is for xgraph */
 
+  ioUtilGH = (ioGH *) GH->extensions [CCTK_GHExtensionHandle ("IO")];
   myGH = (iobasicGH *) GH->extensions [CCTK_GHExtensionHandle ("IOBasic")];
 
   /* the extra characters should be sufficient 
@@ -99,9 +103,14 @@ void IOBasic_WriteGF (cGH *GH, int index, const char *alias)
                reductions [i].extension);
 
       /* see if output files for this alias name were already created */
-      if (GetNamedData (myGH->filenameListScalar, filename) == NULL)
-        openmode = "w";
-      else
+      if (GetNamedData (myGH->filenameListScalar, filename) == NULL) {
+        /* if restart from recovery, all existing files are opened
+           in append mode */
+        if (ioUtilGH->recovered)
+          openmode = access (filename, F_OK) == 0 ? "a" : "w";
+        else
+          openmode = "w";
+      } else
         openmode = "a";
 
       file = fopen (filename, openmode);