Add devctl_process_running() so that power management system driver

can check whether devd(8) is running.

MFC after:	1 week

2 files changed, 10 insertions, 0 deletions

diff --git a/sys/kern/subr_bus.c b/sys/kern/subr_bus.c
index 89876d227..71924cc 100644
--- a/sys/kern/subr_bus.c
+++ b/sys/kern/subr_bus.c
@@ -509,6 +509,15 @@ devpoll(struct cdev *dev, int events, d_thread_t *td)
 }
 
 /**
+ * @brief Return whether the userland process is running
+ */
+boolean_t
+devctl_process_running(void)
+{
+	return (devsoftc.async_proc != NULL);
+}
+
+/**
  * @brief Queue data to be read from the devctl device
  *
  * Generic interface to queue data to the devctl device.  It is
diff --git a/sys/sys/bus.h b/sys/sys/bus.h
index 18f246e..1463437 100644
--- a/sys/sys/bus.h
+++ b/sys/sys/bus.h
@@ -83,6 +83,7 @@ struct u_device {
  * hook to send the message.  However, devctl_queue_data is also
  * included in case devctl_notify isn't sufficiently general.
  */
+boolean_t devctl_process_running(void);
 void devctl_notify(const char *__system, const char *__subsystem,
     const char *__type, const char *__data);
 void devctl_queue_data(char *__data);