Re: temp file creation bug in diffutils 2.7

[Paul Eggert]

Thanks for your bug report.  Your patch isn't portable, since not
every system has mkstemp.  We'll use something like the following
patch instead.

@@ -1012,5 +955,16 @@ edit (left, lname, lline, llen, right, r
 
          {
-           FILE *tmp = ck_fopen (tmpname, "w+");
+           int fd;
+           FILE *tmp;
+
+#if defined O_CREAT && defined O_TRUNC && defined O_EXCL
+           /* Use O_EXCL to avoid race condition.  */
+           fd = open (tmpname, O_RDWR | O_CREAT | O_TRUNC | O_EXCL,
+                      S_IRUSR | S_IWUSR);
+#else
+           fd = creat (tmpname, S_IRUSR | S_IWUSR);
+#endif
+           if (fd < 0 || ! (tmp = fdopen (fd, "w+")))
+             perror_fatal (tmpname);
 
            switch (cmd1)