From 24acbefe3c2127d77b9d6a29f83757a2904c288b Mon Sep 17 00:00:00 2001
From: Albert Cheng <acheng@hdfgroup.org>
Date: Sun, 8 Jun 2008 19:01:03 -0500
Subject: [svn-r15174] An example program showing how to turn on the Journaling
 feature. Has has a temporary patch option (-p) to add datasets back in till
 the object header codes work.

tested: kagiso.
---
 tools/h5recover/enable_journaling.c | 137 ++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100755 tools/h5recover/enable_journaling.c

diff --git a/tools/h5recover/enable_journaling.c b/tools/h5recover/enable_journaling.c
new file mode 100755
index 0000000..96cbc45
--- /dev/null
+++ b/tools/h5recover/enable_journaling.c
@@ -0,0 +1,137 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group.                                               *
+ * Copyright by the Board of Trustees of the University of Illinois.         *
+ * All rights reserved.                                                      *
+ *                                                                           *
+ * This file is part of HDF5.  The full HDF5 copyright notice, including     *
+ * terms governing use, modification, and redistribution, is contained in    *
+ * the files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+/*
+ * This example shows how to use the Journaling feature. It also simulates a
+ * crash without closing the file first.
+ * The patch mode reopens the file, defines the dataset again without writing
+ * any data, then close the file.  This is a temporary fix till the object header
+ * coding is working.
+ */
+
+#include "hdf5.h"
+#include <stdio.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+
+#define H5FILE_NAME        	"JournalEG.h5"
+#define H5JournalFILE_NAME 	H5FILE_NAME".jnl"
+#define DATASETNAME "IntArray"
+#define NX     500                      /* dataset dimensions */
+#define NY     600
+#define CHUNKX 10			/* chunk dimensions */
+#define CHUNKY 10
+#define RANK   2
+
+int
+main (int ac, char **av)
+{
+    hid_t       file, dataset, fapl_id;         /* file and dataset handles */
+    hid_t       dataspace;   			/* handles */
+    hsize_t     dimsf[2]={NX, NY};              /* dataset dimensions */
+    hsize_t     chunk[2]={CHUNKX, CHUNKY};	/* chunk dimensions */
+    hid_t       plist;
+    herr_t      status;
+    int         data[NX][NY];          /* data to write */
+    int         i, j;
+    pid_t	mypid;
+    int		pmode=0;		/* patch mode, default no. */
+
+
+    if (ac > 1){
+	av++;
+        if (strcmp("-p", *av) == 0){
+	    pmode++;
+	    printf("Patch mode on\n");
+	}
+	else{
+	    fprintf(stderr, "Unknown option (%s)\n", *av);
+	    return 1 ;
+	}
+    }
+
+    if (pmode){
+	/* just reopen the file to patch it. */
+	file = H5Fopen(H5FILE_NAME, H5F_ACC_RDWR, H5P_DEFAULT);
+    }else{
+	/* ========================== */
+	/* Enable journaling          */
+	/* ========================== */
+
+	/* create fapl */
+	fapl_id = H5Pcreate(H5P_FILE_ACCESS);
+	if (H5Pset_journal(fapl_id, H5JournalFILE_NAME) < 0){
+	    fprintf(stderr, "H5Pset_journal on data file failed\n");
+	    H5Pclose(fapl_id);
+	    return(-1);
+	}
+	/* Delete the journal file since journal code does not allow existed journal file. */
+	remove(H5JournalFILE_NAME);
+
+	/*
+	 * Create a new file using H5F_ACC_TRUNC access,
+	 * default file creation properties, and default file
+	 * access properties.
+	 */
+	file = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, fapl_id);
+
+	/* close handle not needed any more. */
+	H5Pclose(fapl_id);
+    }
+
+    /*
+     * create the data space for fixed size dataset.
+     */
+    dataspace = H5Screate_simple(RANK, dimsf, NULL);
+
+    /* Create dataset creation property list */
+    plist = H5Pcreate(H5P_DATASET_CREATE);
+    
+    /* Enable chunking */
+    H5Pset_layout(plist, H5D_CHUNKED);
+    H5Pset_chunk(plist, 2, chunk);
+
+    /*
+     * Create a new dataset of native int within the file using defined dataspace
+     * and chunked storage type.
+     */
+    dataset = H5Dcreate2(file, DATASETNAME, H5T_NATIVE_INT, dataspace,
+			H5P_DEFAULT, plist, H5P_DEFAULT);
+
+    /* write actual data and simulate crash only if it is not patch mode. */
+    if (!pmode){
+	/* Initialize data buffers */
+	for(j = 0; j < NX; j++)
+	    for(i = 0; i < NY; i++)
+		data[j][i] = i + j;
+
+	/*
+	 * Write the data to the dataset using default transfer properties.
+	 */
+	status = H5Dwrite(dataset, H5T_NATIVE_INT, H5S_ALL, H5S_ALL, H5P_DEFAULT, data);
+
+
+	/* simulate a crash ending of the application */
+	mypid = getpid();
+	kill(mypid, SIGTERM);	/* Terminate myself */
+    }
+
+    /* Close resources */
+    H5Sclose(dataspace);
+    H5Dclose(dataset);
+    H5Pclose(plist);
+    H5Fclose(file);
+}
-- 
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