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ip/dhcpd: Add swap server support in dhcpd (thanks k0ga)

--- a/sys/man/8/dhcpd

+++ b/sys/man/8/dhcpd

@@ -159,6 +159,9 @@

 the default boot file;

 see

 .IR ndb (6)

+.TP

+.B swap

+used by Unix machines for boot NFS server

 .PD

 .PP

 .I Dhcpd

--- a/sys/src/cmd/ip/dhcpd/dhcpd.c

+++ b/sys/src/cmd/ip/dhcpd/dhcpd.c

@@ -1186,6 +1186,9 @@

 		case OBnetbiosns:

 			a[na++] = "@wins";

 			break;

+		case OBswapserver:

+			a[na++] = "@swap";

+			break;

 		case OBsmtpserver:

 			a[na++] = "@smtp";

 			break;

@@ -1255,6 +1258,10 @@

 		case OBwwwserver:

 			j = lookupserver("www", addrs, nelem(addrs), t);

 			addrsopt(rp, OBwwwserver, addrs, j);

+			break;

+		case OBswapserver:

+			j = lookupserver("swap", addrs, nelem(addrs), t);

+			addrsopt(rp, OBswapserver, addrs, j);

 			break;

 		case OBntpserver:

 			j = lookupserver("ntp", addrs, nelem(addrs), t);