+ /* Create the name of the lock-file for file fn */
+ MAKE_LOCK_NAME (lfname, encoded_fn);
+
+ /* Try to lock the lock. */
+ if (0 < lock_if_free (&lock_info, lfname))
+ {
+ /* Someone else has the lock. Consider breaking it. */
+ Lisp_Object attack;
+ char *dot = lock_info.dot;
+ ptrdiff_t pidlen = lock_info.colon - (dot + 1);
+ static char const replacement[] = " (pid ";
+ int replacementlen = sizeof replacement - 1;
+ memmove (dot + replacementlen, dot + 1, pidlen);
+ strcpy (dot + replacementlen + pidlen, ")");
+ memcpy (dot, replacement, replacementlen);
+ attack = call2 (intern ("ask-user-about-lock"), fn,
+ build_string (lock_info.user));
+ /* Take the lock if the user said so. */
+ if (!NILP (attack))
+ lock_file_1 (lfname, 1);
+ }
+ SAFE_FREE ();
+ }