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/*
* openhmdkeepalivedaemon - Keep specific HMD's alive (powered up and discoverable
* by the display system) so they are more easy to handle for software that has
* trouble dynamically discovering their associated video outputs if the HMD has
* its display powered down, e.g., X-Servers in multi-x-screen configuration, or
* Psychtoolbox Screen() function. The list of HMD which require this treatment
* is hard-coded.
*
* This daemon checks for attached but unused OpenHMD supported HMD's like the
* CV1 every 5 seconds. If it finds such a device, it opens and closes the device,
* thereby powering up the device and its display, and (re)arming the devices keep
* alive timer to keep the device awake for a couple of seconds. The cycle repeats
* often enough to keep such devices permanently active.
*
* Requires libopenhmd.so (http://www.openhmd.net) and its dependencies.
*
* Compile with: gcc -o openhmdkeepalivedaemon openhmdkeepalivedaemon.c -lc -lopenhmd -lm
*
* Run as daemon without runtime debug output: openhmdkeepalivedaemon
* Run in session with verbose runtime debug: openhmdkeepalivedaemon -v
*
* Copyright (c) 2017 Mario Kleiner.
*
* Licensed to you under the MIT license:
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do so, subject to the
* following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
* NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include "openhmd.h"
struct ohmd_context *ctx;
int verbose;
int byebye = 0;
void doterminate(int sig)
{
(void) sig;
byebye = 1;
}
int main(int argc, char* argv[])
{
ohmd_device* hmd;
int available_devices;
int deviceIndex;
verbose = ((argc > 1) && !strcmp(argv[1], "-v")) ? 1 : 0;
if ((ctx = ohmd_ctx_create()) == NULL) {
printf("%s: Initialization of OpenHMD runtime failed. Exiting...\n", argv[0]);
return(-1);
}
signal(SIGTERM, &doterminate);
signal(SIGINT, &doterminate);
printf("%s: OpenHMD VR runtime initialized, getting to work.", argv[0]);
if (verbose)
printf("\n");
else
printf(" Turning into a background daemon: 'killall %s' to terminate me.\n", argv[0]);
fflush(NULL);
// If no debug output at runtime is requested, turn us into a background daemon:
if (!verbose)
if (daemon(1, 0))
perror("Failed to daemonize!");
// Infinite probe and keepalive loop:
while (!byebye) {
const int noautoupdate = 0;
// Get count of available devices:
available_devices = ohmd_ctx_probe(ctx);
// Iterate over all devices:
for (deviceIndex = 0; deviceIndex < available_devices; deviceIndex++) {
// Skip HMDs which don't need this kind of treatment:
if ((!strstr(ohmd_list_gets(ctx, deviceIndex, OHMD_PRODUCT), "Rift (CV")) &&
(!strstr(ohmd_list_gets(ctx, deviceIndex, OHMD_PRODUCT), "Deepoon")) &&
(!strstr(ohmd_list_gets(ctx, deviceIndex, OHMD_PRODUCT), "PSVR")) &&
(!strstr(ohmd_list_gets(ctx, deviceIndex, OHMD_PRODUCT), "Vive")))
continue;
// Disable auto-updater thread for this one-shot init & keep alive:
ohmd_device_settings *settings = ohmd_device_settings_create(ctx);
ohmd_device_settings_seti(settings, OHMD_IDS_AUTOMATIC_UPDATE, &noautoupdate);
// Try to open it. If this works, this means the HMD is not in use
// by actual VR apps, so we keep it alive by opening it.
hmd = ohmd_list_open_device_s(ctx, deviceIndex, settings);
ohmd_device_settings_destroy(settings);
if (hmd) {
// Opening it powered its display up if it was off, and set a keep alive
// timeout of at least a couple seconds (10 secs i think?), so it will
// stay up for at least 10 seconds after we close it. Now we can close
// it, so actual VR apps can use it, at least for non Vive devices:
if (!strstr(ohmd_list_gets(ctx, deviceIndex, OHMD_PRODUCT), "Vive")) {
ohmd_close_device(hmd);
}
else {
// HTC Vive is special: OpenHMD would power down the Vive and its
// display on ohmd_close_device(), so we can't close the device.
// However we must release the underlying HID device for actual VR
// renderers to access the Vive. We can't call ohmd_ctx_destroy()
// either, as that would imply ohmd_close_device.
// So we do something dirty: We terminate ourselves here without
// properly closing down anything. This will not power down the Vive,
// but the OS will release the HID device on process termination, so
// actual clients can access it. The downside of this is we will
// be gone after one cycle, so mixing Vives with other HMDs would
// not work well.
byebye = 2;
}
if (verbose)
printf("%s: Keep alive cycle done for HMD %i: %s [%s].\n", argv[0], deviceIndex,
ohmd_list_gets(ctx, deviceIndex, OHMD_PRODUCT),
ohmd_list_gets(ctx, deviceIndex, OHMD_PATH));
}
else if (verbose)
printf("%s: HMD %i: %s [%s] in use at the moment, no need to keep alive.\n", argv[0],
deviceIndex, ohmd_list_gets(ctx, deviceIndex, OHMD_PRODUCT),
ohmd_list_gets(ctx, deviceIndex, OHMD_PATH));
}
// Sleep for 5 seconds before next keep alive cycle. Should be
// short enough for no unattended HMD to time out:
if (!byebye)
sleep(5);
// Rinse, wash, repeat.
}
// Skip context destroy for special devices like the Vive (see above):
if (byebye != 2)
ohmd_ctx_destroy(ctx);
if (verbose)
printf("%s: Exiting OpenHMD keep alive daemon.\n", argv[0]);
fflush(stdout);
return(0);
}
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