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Subject[Suspend2][ 05/21] [Suspend2] Receive a message from the userui.
Date
Receive a message from the userspace user interface.

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

kernel/power/ui.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 58 insertions(+), 0 deletions(-)
diff --git a/kernel/power/ui.c b/kernel/power/ui.c
index 365c033..48719de 100644
--- a/kernel/power/ui.c
+++ b/kernel/power/ui.c
@@ -118,3 +118,61 @@ void request_abort_suspend(void)
}
}

+static int userui_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ int type;
+ int *data;
+
+ type = nlh->nlmsg_type;
+
+ /* A control message: ignore them */
+ if (type < NETLINK_MSG_BASE)
+ return 0;
+
+ /* Unknown message: reply with EINVAL */
+ if (type >= USERUI_MSG_MAX)
+ return -EINVAL;
+
+ /* All operations require privileges, even GET */
+ if (security_netlink_recv(skb))
+ return -EPERM;
+
+ /* Only allow one task to receive NOFREEZE privileges */
+ if (type == NETLINK_MSG_NOFREEZE_ME && ui_helper_data.pid != -1)
+ return -EBUSY;
+
+ data = (int*)NLMSG_DATA(nlh);
+
+ switch (type) {
+ case USERUI_MSG_ABORT:
+ request_abort_suspend();
+ break;
+ case USERUI_MSG_GET_STATE:
+ suspend_send_netlink_message(&ui_helper_data,
+ USERUI_MSG_GET_STATE, &suspend_action,
+ sizeof(suspend_action));
+ break;
+ case USERUI_MSG_GET_DEBUG_STATE:
+ suspend_send_netlink_message(&ui_helper_data,
+ USERUI_MSG_GET_DEBUG_STATE,
+ &suspend_debug_state,
+ sizeof(suspend_debug_state));
+ break;
+ case USERUI_MSG_SET_STATE:
+ if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int)))
+ return -EINVAL;
+ ui_nl_set_state(*data);
+ break;
+ case USERUI_MSG_SET_DEBUG_STATE:
+ if (nlh->nlmsg_len < NLMSG_LENGTH(sizeof(int)))
+ return -EINVAL;
+ suspend_debug_state = (*data);
+ break;
+ case USERUI_MSG_SPACE:
+ wake_up_interruptible(&userui_wait_for_key);
+ break;
+ }
+
+ return 1;
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
-
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