[uml-devel] [PATCH] make port channel use setsockopt SO_REUSEADDR

[Michael Clark <michael@metaparadigm.com>]

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Hi All,

Small patch to make port channels allow reuse of local addresses.
Useful in the case where you restart a UML from a script and you
don't want to have to allocate a new port number each time.

~mc

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--- linux-2.6.7-uml/arch/um/drivers/port_user.c.orig	2004-07-06 18:48:45.000000000 +0800
+++ linux-2.6.7-uml/arch/um/drivers/port_user.c	2004-07-06 18:51:11.000000000 +0800
@@ -118,12 +118,16 @@
 int port_listen_fd(int port)
 {
 	struct sockaddr_in addr;
-	int fd, err;
+	int fd, err, arg;
 
 	fd = socket(PF_INET, SOCK_STREAM, 0);
 	if(fd == -1) 
 		return(-errno);
 
+	arg = 1;
+	if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0)
+		return(-errno);
+
 	addr.sin_family = AF_INET;
 	addr.sin_port = htons(port);
 	addr.sin_addr.s_addr = htonl(INADDR_ANY);