- implement bind to device functionality
--- trunk.orig/src/supl-client.c	2011-10-21 20:51:38.000000000 +0200
+++ trunk/src/supl-client.c	2013-04-24 18:55:01.937252375 +0200
@@ -252,6 +252,7 @@ static char *usage_str =
 "  --cell gsm:mcc,mns:lac,ci|wcdma:mcc,msn,uc	set current gsm/wcdma cell id\n"
 "  --cell gsm:mcc,mns:lac,ci:lat,lon,uncert	set known gsm cell id with position\n"
 "  --format|-f human				machine parseable output\n"
+"  --interface|-i iface                         bind to this interface\n"
 "  --debug|-d <n>				1 == RRLP, 2 == SUPL, 4 == DEBUG\n"
 "  --debug-file file				write debug to file\n"
 "  --help|-h					show this help\n"
@@ -267,6 +268,7 @@ static struct option long_opts[] = {
   { "cell", 1, 0, 0 },
   { "debug", 1, 0, 'd' },
   { "format", 1, 0, 'f' },
+  { "interface", 1, 0, 0},
   { "test", 1, 0, 't' },
   { "set-pos", 1, 0, 0 },
   { "pos-helper", 1, 0, 0 },
@@ -310,7 +312,7 @@ int main(int argc, char *argv[]) {
     int opt_index;
     int c;
 
-    c = getopt_long(argc, argv, "ad:f:t:", long_opts, &opt_index);
+    c = getopt_long(argc, argv, "ad:f:i:t:", long_opts, &opt_index);
     if (c == -1) break;
     switch (c) {
     case 0:
@@ -374,6 +376,11 @@ int main(int argc, char *argv[]) {
       }
       break;
 
+    case 'i':
+      strncpy(ctx.iface, optarg, IFNAMSIZ);
+      ctx.iface[IFNAMSIZ] = 0;
+      break;
+
     case 'd': 
       {
 	int debug = atoi(optarg);