rrd restore should not burn down existing files -- Paul Vixie <paul@vix.com>

git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@110 a5681a0c-68f1-0310-ab6d-d61299d08faa

diff --git a/src/rrd_restore.c b/src/rrd_restore.c
index 207986d..fa5e412 100644 (file)
--- a/src/rrd_restore.c
+++ b/src/rrd_restore.c
@@ -406,9 +406,12 @@ rrd_write(char *file_name, rrd_t *rrd)
     if (strcmp("-",file_name)==0){
       *rrd_file= *stdout;
     } else {
-      if ((rrd_file = fopen(file_name,"wb")) == NULL ) {
+      int fd = open(file_name,O_RDWR|O_CREAT|O_EXCL);
+      if (fd == -1 || (rrd_file = fdopen(fd,"wb")) == NULL) {
        rrd_set_error("creating '%s': %s",file_name,strerror(errno));
        rrd_free(rrd);
+        if (fd != -1)
+          close(fd);
        return(-1);
       }
     }