Description:
------------
I would like to start an instance of the FastCGI interpreter which listens to a Unix Domain socket. libfcgi would this, but the wrapper code in cgi_main.c differentiates only between

php4-cgi -b $ADDRESS:$PORT

and

php4-cgi -b [:]$PORT

If the colon is missing, it is assumed that the user wants a TCP socket which is not bound to a specific address and thus a colon is prepended. This breaks passing a path to a Unix Domain socket.
Fix: Since libfcgi apparently accepts the port only in numeric form anyhow, I have simply added a check whether the first character of the argument is a digit. In this case, it is assumed to be a port and prepended with a colon. If not, it is assumed to be a pathname.
Alternatively, one could altogether remove the code which prepends the colon and document the behavior.

diff -ui cgi_main.c.orig cgi_main.c
--- cgi_main.c.orig	2005-07-12 15:04:19.000000000 +0200
+++ cgi_main.c	2005-07-12 15:53:48.000000000 +0200
@@ -1140,12 +1140,12 @@
 		/* this must be done to make FCGX_OpenSocket work correctly 
 		   bug 23664 */
 		close(0);
-		/* Pass on the arg to the FastCGI library, with one exception.
-		 * If just a port is specified, then we prepend a ':' onto the
-		 * path (it's what the fastcgi library expects)
+		/* Pass on the arg to the FastCGI library, with one exception. 
+		 * If just a numeric port is specified, then we prepend a ':'
+		 * onto the path (it's what the fastcgi library expects)
 		 */
 		
-		if (strchr(bindpath, ':') == NULL) {
+		if ( isdigit(bindpath[0]) && (strchr(bindpath, ':') == NULL) ) {
 			char *tmp;
 
 			tmp = malloc(strlen(bindpath) + 2);


Actual result:
--------------
bengen@ataraxia:~$ php4-cgi -b /tmp/foo
bind/listen: No such file or directory
Couldn't create FastCGI listen socket on port /tmp/foo
bengen@ataraxia:~$ echo $?
255
bengen@ataraxia:~$