added --no-overwrite option to rrdtool create. It prevents rrdtool from clobbering...

[rrdtool.git] / src / rrd_open.c

diff --git a/src/rrd_open.c b/src/rrd_open.c
index dba4ca6..0939e7c 100644 (file)
--- a/src/rrd_open.c
+++ b/src/rrd_open.c
@@ -1,15 +1,21 @@
 /*****************************************************************************
- * RRDtool 1.3.2  Copyright by Tobi Oetiker, 1997-2008
+ * RRDtool 1.4.2  Copyright by Tobi Oetiker, 1997-2009
  *****************************************************************************
  * rrd_open.c  Open an RRD File
  *****************************************************************************
  * $Id$
  *****************************************************************************/
 
+#ifdef WIN32
 #include <stdlib.h>
 #include <fcntl.h>
 #include <sys/stat.h>
+#endif
+
+#ifdef HAVE_BROKEN_MS_ASYNC
+#include <sys/types.h>
 #include <utime.h>
+#endif
 
 #include "rrd_tool.h"
 #include "unused.h"
@@ -166,6 +172,9 @@ rrd_file_t *rrd_open(
         if (rdwr & RRD_CREAT) {
             flags |= (O_CREAT | O_TRUNC);
         }
+        if (rdwr & RRD_EXCL) {
+            flags |= O_EXCL;
+        }
     }
     if (rdwr & RRD_READAHEAD) {
 #ifdef MAP_POPULATE
@@ -210,7 +219,10 @@ rrd_file_t *rrd_open(
     } else {
         rrd_file->file_len = newfile_size;
         lseek(rrd_simple_file->fd, newfile_size - 1, SEEK_SET);
-        write(rrd_simple_file->fd, "\0", 1);   /* poke */
+        if ( write(rrd_simple_file->fd, "\0", 1) == -1){    /* poke */
+            rrd_set_error("write '%s': %s", file_name, rrd_strerror(errno));
+            goto out_close;
+        }
         lseek(rrd_simple_file->fd, 0, SEEK_SET);
     }
 #ifdef HAVE_POSIX_FADVISE
@@ -253,12 +265,14 @@ rrd_file_t *rrd_open(
 #ifdef USE_MADVISE
     if (rdwr & RRD_COPY) {
         /* We will read everything in a moment (copying) */
-        madvise(data, rrd_file->file_len, MADV_WILLNEED | MADV_SEQUENTIAL);
+        madvise(data, rrd_file->file_len, MADV_WILLNEED );
+        madvise(data, rrd_file->file_len, MADV_SEQUENTIAL );
     } else {
         /* We do not need to read anything in for the moment */
         madvise(data, rrd_file->file_len, MADV_RANDOM);
         /* the stat_head will be needed soonish, so hint accordingly */
-        madvise(data, sizeof(stat_head_t), MADV_WILLNEED | MADV_RANDOM);
+        madvise(data, sizeof(stat_head_t), MADV_WILLNEED);
+        madvise(data, sizeof(stat_head_t), MADV_RANDOM);
     }
 #endif
 
@@ -669,6 +683,13 @@ ssize_t rrd_write(
 }
 
 
+/* this is a leftover from the old days, it serves no purpose
+   and is therefore turned into a no-op */
+void rrd_flush(
+    rrd_file_t *rrd_file  __attribute__((unused)))
+{
+}
+
 /* Initialize RRD header.  */
 
 void rrd_init(