xref: /libuv/src/win/detect-wakeup.c (revision 79c531cb)
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 
uv__init_detect_system_wakeup(void)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 
uv__system_resume_callback(PVOID Context,ULONG Type,PVOID Setting)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 
uv__register_system_resume_callback(void)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