From 1a07cf4ab1377073e7285a65f887303870e42e3f Mon Sep 17 00:00:00 2001
From: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Date: Fri, 10 Oct 2014 10:47:19 +0300
Subject: [PATCH] hwsim: Add attribute to destroy radio when program stops

The new attribute causes the radio to be removed if the hwsim process
dies. This is the default behaviour. If user calls the binary with -k
option, then the radio is kept after hwsim quits.
This requires kernel support for HWSIM_ATTR_DESTROY_RADIO_ON_CLOSE
attribute.
---
 tools/hwsim.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/tools/hwsim.c b/tools/hwsim.c
index 891411e7..97deb5f8 100644
--- a/tools/hwsim.c
+++ b/tools/hwsim.c
@@ -57,12 +57,14 @@ enum {
 	HWSIM_ATTR_REG_STRICT_REG,
 	HWSIM_ATTR_SUPPORT_P2P_DEVICE,
 	HWSIM_ATTR_USE_CHANCTX,
+	HWSIM_ATTR_DESTROY_RADIO_ON_CLOSE,
 	__HWSIM_ATTR_MAX,
 };
 #define HWSIM_ATTR_MAX (__HWSIM_ATTR_MAX - 1)
 
 static struct l_genl_family *hwsim;
 
+static bool keep_radios = false;
 static bool create_action = false;
 static const char *destroy_action = NULL;
 
@@ -131,7 +133,13 @@ static void hwsim_ready(void *user_data)
 	struct l_genl_msg *msg;
 
 	if (create_action) {
-		msg = l_genl_msg_new(HWSIM_CMD_CREATE_RADIO);
+		msg = l_genl_msg_new_sized(HWSIM_CMD_CREATE_RADIO,
+					keep_radios ? 0 : 4);
+		if (!keep_radios)
+			l_genl_msg_append_attr(msg,
+					HWSIM_ATTR_DESTROY_RADIO_ON_CLOSE,
+					0, NULL);
+
 		l_genl_family_send(hwsim, msg, create_callback, NULL, NULL);
 		l_genl_msg_unref(msg);
 		return;
@@ -165,12 +173,15 @@ static void usage(void)
 	printf("Options:\n"
 		"\t-C, --create           Create new simulated radio\n"
 		"\t-D, --destroy <id>     Destroy existing radio\n"
+		"\t-k, --keep             Do not destroy radios when "
+							"program exits\n"
 		"\t-h, --help             Show help options\n");
 }
 
 static const struct option main_options[] = {
 	{ "create",    no_argument,       NULL, 'C' },
 	{ "destroy",   required_argument, NULL, 'D' },
+	{ "keep",      no_argument,       NULL, 'k' },
 	{ "version",   no_argument,       NULL, 'v' },
 	{ "help",      no_argument,       NULL, 'h' },
 	{ }
@@ -186,7 +197,7 @@ int main(int argc, char *argv[])
 	for (;;) {
 		int opt;
 
-		opt = getopt_long(argc, argv, "CD:vh", main_options, NULL);
+		opt = getopt_long(argc, argv, "CD:vhk", main_options, NULL);
 		if (opt < 0)
 			break;
 
@@ -197,6 +208,9 @@ int main(int argc, char *argv[])
 		case 'D':
 			destroy_action = optarg;
 			break;
+		case 'k':
+			keep_radios = true;
+			break;
 		case 'v':
 			printf("%s\n", VERSION);
 			return EXIT_SUCCESS;