[Suspend2][ 12/13] [Suspend2] Start a userspace helper.

[Nigel Cunningham <nigel@suspend2.net>]

Attempt to start a userspace helper and set up the netlink socket
connection to it.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 kernel/power/netlink.c |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/kernel/power/netlink.c b/kernel/power/netlink.c
index d7a3a90..0a379c3 100644
--- a/kernel/power/netlink.c
+++ b/kernel/power/netlink.c
@@ -344,3 +344,29 @@ int suspend2_launch_userspace_program(ch
 	return retval;
 }
 
+int suspend_netlink_setup(struct user_helper_data *uhd)
+{
+	if (netlink_prepare(uhd) < 0) {
+		printk("Netlink prepare failed.\n");
+		return 1;
+	}
+
+	if (suspend2_launch_userspace_program(uhd->program, uhd->netlink_id) < 0) {
+		printk("Launch userspace program failed.\n");
+		suspend_netlink_close(uhd);
+		return 1;
+	}
+
+	/* Wait 2 seconds for the userspace process to make contact */
+	wait_for_completion_timeout(&uhd->wait_for_process, 2*HZ);
+
+	if (uhd->pid == -1) {
+		printk("%s: Failed to contact userspace process.\n",
+				uhd->name);
+		suspend_netlink_close(uhd);
+		return 1;
+	}
+
+	return 0;
+}
+#endif

--
Nigel Cunningham		nigel at suspend2 dot net