System Event Handling for Non Global Zone via GPEC event queue channel

System event is not allowed in NG-zone. However, system calls
via sysevent 3SYSEVENT is the working solution

sysevent_bind_handle(3SYSEVENT) – bind or unbind subscriber handle
sysevent_free(3SYSEVENT) – free memory for sysevent handle
sysevent_get_attr_list(3SYSEVENT) – get attribute list pointer
sysevent_get_class_name(3SYSEVENT) – get class name, subclass name, ID or buffer size of event
sysevent_get_pid(3SYSEVENT) – get vendor name, publisher name or processor ID of event
sysevent_get_pub_name(3SYSEVENT) – get vendor name, publisher name or processor ID of event
sysevent_get_seq(3SYSEVENT) – get class name, subclass name, ID or buffer size of event
sysevent_get_size(3SYSEVENT) – get class name, subclass name, ID or buffer size of event
sysevent_get_subclass_name(3SYSEVENT) – get class name, subclass name, ID or buffer size of event
sysevent_get_time(3SYSEVENT) – get class name, subclass name, ID or buffer size of event
sysevent_get_vendor_name(3SYSEVENT) – get vendor name, publisher name or processor ID of event
sysevent_post_event(3SYSEVENT) – post system event for applications
sysevent_subscribe_event(3SYSEVENT) – register or unregister interest in event receipt
sysevent_unbind_handle(3SYSEVENT) – bind or unbind subscriber handle
sysevent_unsubscribe_event(3SYSEVENT) – register or unregister interest in event receipt