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      1 /* Copyright libuv project contributors. All rights reserved.
      2  *
      3  * Permission is hereby granted, free of charge, to any person obtaining a copy
      4  * of this software and associated documentation files (the "Software"), to
      5  * deal in the Software without restriction, including without limitation the
      6  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
      7  * sell copies of the Software, and to permit persons to whom the Software is
      8  * furnished to do so, subject to the following conditions:
      9  *
     10  * The above copyright notice and this permission notice shall be included in
     11  * all copies or substantial portions of the Software.
     12  *
     13  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     14  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     15  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
     16  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     17  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
     18  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
     19  * IN THE SOFTWARE.
     20  */
     21 
     22 #include "uv.h"
     23 #include "internal.h"
     24 #include "winapi.h"
     25 
     26 static void uv__register_system_resume_callback(void);
     27 
     28 void uv__init_detect_system_wakeup(void) {
     29   /* Try registering system power event callback. This is the cleanest
     30    * method, but it will only work on Win8 and above.
     31    */
     32   uv__register_system_resume_callback();
     33 }
     34 
     35 static ULONG CALLBACK uv__system_resume_callback(PVOID Context,
     36                                                  ULONG Type,
     37                                                  PVOID Setting) {
     38   if (Type == PBT_APMRESUMESUSPEND || Type == PBT_APMRESUMEAUTOMATIC)
     39     uv__wake_all_loops();
     40 
     41   return 0;
     42 }
     43 
     44 static void uv__register_system_resume_callback(void) {
     45   _DEVICE_NOTIFY_SUBSCRIBE_PARAMETERS recipient;
     46   _HPOWERNOTIFY registration_handle;
     47 
     48   if (pPowerRegisterSuspendResumeNotification == NULL)
     49     return;
     50 
     51   recipient.Callback = uv__system_resume_callback;
     52   recipient.Context = NULL;
     53   (*pPowerRegisterSuspendResumeNotification)(DEVICE_NOTIFY_CALLBACK,
     54                                              &recipient,
     55                                              &registration_handle);
     56 }
     57