pub unsafe extern "C" fn switch_channel_process_export(
channel: *mut switch_channel_t,
peer_channel: *mut switch_channel_t,
var_event: *mut switch_event_t,
export_varname: *const c_char,
)pub unsafe extern "C" fn switch_channel_process_export(
channel: *mut switch_channel_t,
peer_channel: *mut switch_channel_t,
var_event: *mut switch_event_t,
export_varname: *const c_char,
)