diff -rdup rrdtool-trunk.sent-20070524-1726/src/rrd_dump.c rrdtool-trunk/src/rrd_dump.c
--- rrdtool-trunk.sent-20070524-1726/src/rrd_dump.c	2007-05-24 16:01:53.000000000 +0200
+++ rrdtool-trunk/src/rrd_dump.c	2007-05-24 20:24:45.000000000 +0200
@@ -83,7 +83,7 @@ int rrd_dump_r(
     rrd_value_t value;
     struct tm tm;
 
-    rrd_file = rrd_open(filename, &rrd, RRD_READONLY|RRD_READAHEAD);
+    rrd_file = rrd_open(filename, &rrd, RRD_READONLY | RRD_READAHEAD);
     if (rrd_file == NULL) {
         rrd_free(&rrd);
         return (-1);
iff -rdup rrdtool-trunk.sent-20070524-1726/src/rrd_fetch.c rrdtool-trunk/src/rrd_fetch.c
--- rrdtool-trunk.sent-20070524-1726/src/rrd_fetch.c	2007-05-24 17:04:12.000000000 +0200
+++ rrdtool-trunk/src/rrd_fetch.c	2007-05-24 20:24:45.000000000 +0200
@@ -378,10 +378,9 @@ int rrd_fetch_fn(
     else
         rra_pointer = rrd.rra_ptr[chosen_rra].cur_row + 1 + start_offset;
 
-    if (rrd_seek(rrd_file, (rra_base
-                            + (rra_pointer
-                               * (*ds_cnt)
-                               * sizeof(rrd_value_t))), SEEK_SET) != 0) {
+    if (rrd_seek(rrd_file, (rra_base + (rra_pointer * (*ds_cnt)
+                                        * sizeof(rrd_value_t))),
+                 SEEK_SET) != 0) {
         rrd_set_error("seek error in RRA");
         for (i = 0; (unsigned) i < *ds_cnt; i++)
             free((*ds_namv)[i]);
@@ -429,8 +428,7 @@ int rrd_fetch_fn(
              * be wrapped*/
             if (rra_pointer >= (signed) rrd.rra_def[chosen_rra].row_cnt) {
                 rra_pointer -= rrd.rra_def[chosen_rra].row_cnt;
-                if (rrd_seek(rrd_file, (rra_base + rra_pointer
-                                        * (*ds_cnt)
+                if (rrd_seek(rrd_file, (rra_base + rra_pointer * (*ds_cnt)
                                         * sizeof(rrd_value_t)),
                              SEEK_SET) != 0) {
                     rrd_set_error("wrap seek in RRA did fail");
diff -rdup rrdtool-trunk.sent-20070524-1726/src/rrd_open.c rrdtool-trunk/src/rrd_open.c
--- rrdtool-trunk.sent-20070524-1726/src/rrd_open.c	2007-05-24 17:26:17.000000000 +0200
+++ rrdtool-trunk/src/rrd_open.c	2007-05-24 20:27:20.000000000 +0200
@@ -302,13 +302,16 @@ rrd_file_t *rrd_open(
 int rrd_close(
     rrd_file_t *rrd_file)
 {
-    int       ret = 0;
+    int       ret;
 
 #ifdef HAVE_MMAP
     ret = munmap(rrd_file->file_start, rrd_file->file_len);
-//  if (ret != 0)
-//      rrd_set_error("munmap rrd_file");
+    if (ret != 0)
+        rrd_set_error("munmap rrd_file: %s", rrd_strerror(errno));
 #endif
+    ret = close(rrd_file->fd);
+    if (ret != 0)
+        rrd_set_error("closing file: %s", rrd_strerror(errno));
     free(rrd_file);
     rrd_file = NULL;
     return ret;
@@ -377,18 +380,12 @@ ssize_t rrd_write(
     const void *buf,
     size_t count)
 {
-    ssize_t   ret = count;
-
 #ifdef HAVE_MMAP
-    char     *off, *new_pos;
-
-    off = rrd_file->file_start + rrd_file->pos;
-    new_pos = memmove(rrd_file->file_start + rrd_file->pos, buf, count);
-    ret = new_pos - off;
+    memmove(rrd_file->file_start + rrd_file->pos, buf, count);
+    return count;       /* mimmic write() semantics */
 #else
-    ret = write(rrd_file->fd, buf, count);
+    return write(rrd_file->fd, buf, count);
 #endif
-    return ret;
 }
 
 /* flush all data pending to be written to FD.  */
@@ -427,6 +424,7 @@ void rrd_free(
     free(rrd->pdp_prep);
     free(rrd->cdp_prep);
     free(rrd->rrd_value);
+//XXX: ? rrd_init(rrd);
 #endif
 }
 
diff -rdup rrdtool-trunk.sent-20070524-1726/src/rrd_resize.c rrdtool-trunk/src/rrd_resize.c
--- rrdtool-trunk.sent-20070524-1726/src/rrd_resize.c	2007-05-24 14:51:21.000000000 +0200
+++ rrdtool-trunk/src/rrd_resize.c	2007-05-24 20:24:45.000000000 +0200
@@ -82,7 +82,7 @@ int rrd_resize(
             return (-1);
         }
 
-    rrd_out_file = rrd_open(outfilename, &rrdnew, RRD_READWRITE|RRD_CREAT);
+    rrd_out_file = rrd_open(outfilename, &rrdnew, RRD_READWRITE | RRD_CREAT);
     if (rrd_out_file == NULL) {
         rrd_set_error("Can't create '%s': %s", outfilename,
                       rrd_strerror(errno));
diff -rdup rrdtool-trunk.sent-20070524-1726/src/rrd_update.c rrdtool-trunk/src/rrd_update.c
--- rrdtool-trunk.sent-20070524-1726/src/rrd_update.c	2007-05-24 15:58:48.000000000 +0200
+++ rrdtool-trunk/src/rrd_update.c	2007-05-24 20:27:10.000000000 +0200
@@ -105,7 +105,7 @@ static info_t *write_RRA_row(
             (rrd_file,
              &(rrd->cdp_prep[cdp_idx].scratch[CDP_scratch_idx].u_val),
              sizeof(rrd_value_t) * 1) != sizeof(rrd_value_t) * 1) {
-            rrd_set_error("writing rrd");
+            rrd_set_error("writing rrd: %s", rrd_strerror(errno));
             return 0;
         }
         *rra_current += sizeof(rrd_value_t);
@@ -1458,10 +1458,12 @@ int _rrd_update(
         free(rra_step_cnt);
     rpnstack_free(&rpnstack);
 
-#ifdef HAVE_MMAP
+#if 0                   //def HAVE_MMAP
     if (munmap(rrd_file->file_start, rrd_file->file_len) == -1) {
         rrd_set_error("error writing(unmapping) file: %s", filename);
     }
+#else
+    rrd_flush(rrd_file);    //XXX: really needed?
 #endif
     /* if we got here and if there is an error and if the file has not been
      * written to, then close things up and return. */
@@ -1609,20 +1611,9 @@ int _rrd_update(
             return (-1);
         }
 #endif
-        close(rrd_file->fd);
-    }
-
-    /* OK now close the files and free the memory */
-    if (close(rrd_file->fd) != 0) {
-        rrd_set_error("closing rrd");
-        free(updvals);
-        free(tmpl_idx);
-        rrd_free(&rrd);
-        free(pdp_temp);
-        free(pdp_new);
-        return (-1);
     }
 
+    rrd_close(rrd_file);
     rrd_free(&rrd);
     free(updvals);
     free(tmpl_idx);