Add -ipc option to control gpu-screen-recorder over a unix domain socket

The socket accepts the same commands as the signal handlers, except that
saving a replay takes an arbitrary number of seconds instead of only the
fixed times that the signals provide. Requests and replies are newline
terminated json objects and every request is replied to, parsed with the
sj.h json library that was added to external.
Requests are handled on a thread that only runs while the recorder
exists, so the recorder control fields are now atomics, which they have
to be now that another thread writes them.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/recorder/screenshot.c b/src/recorder/screenshot.c
index 47fedef..2e4357d 100644
--- a/src/recorder/screenshot.c
+++ b/src/recorder/screenshot.c
@@ -67,7 +67,7 @@ int gsr_screenshot_take(const gsr_screenshot_params *params) {
     gsr_window *window = params->window;
     gsr_capture_deps *capture_deps = params->capture_deps;
     gsr_capture_sources *capture_sources = params->capture_sources;
-    const volatile sig_atomic_t *running = params->running;
+    const atomic_int *running = params->running;
     const int image_quality = video_quality_to_image_quality_value(settings->video_quality);
     const gsr_color_range color_range = image_format_to_color_range(params->image_format, image_quality);
 
@@ -122,7 +122,7 @@ int gsr_screenshot_take(const gsr_screenshot_params *params) {
     bool should_stop_error = false;
     egl->glClear(0);
 
-    while(*running) {
+    while(atomic_load(running)) {
         while(gsr_window_process_event(window)) {
             if(capture_deps->x11_cursor_display && settings->record_cursor)
                 gsr_cursor_on_event(&capture_deps->x11_cursor, gsr_window_get_event_data(window));
@@ -175,7 +175,7 @@ int gsr_screenshot_take(const gsr_screenshot_params *params) {
         if(all_sources_captured)
             break;
 
-        if(*running)
+        if(atomic_load(running))
             usleep(30 * 1000); // 30 ms
     }