Fix UNLISTEN to fall out quickly if the current backend has never executed
tree7224ac8b6b21cbeb5a7f6eb444b1131fbea2c406
-rw-r--r-- 1192 COPYRIGHT
-rw-r--r-- 4269 GNUmakefile.in
-rw-r--r-- 1423 Makefile
-rw-r--r-- 1287 README
-rw-r--r-- 767 README.CVS
-rw-r--r-- 387 aclocal.m4
drwxr-xr-x - config
-rwxr-xr-x 796000 configure
-rw-r--r-- 60346 configure.in
drwxr-xr-x - contrib
drwxr-xr-x - doc
drwxr-xr-x - src