feat: 添加clipboard-event不同平台源代码

public/node_modules/clipboard-event/platform/clipboard-event-handler-linux.c

@@ -0,0 +1,38 @@
+// https://stackoverflow.com/a/44992967
+// gcc -o xclipwatch xclipwatch.c -lX11 -lXfixes
+
+#include <X11/extensions/Xfixes.h>
+#include<stdio.h>
+#include <assert.h>
+
+void WatchSelection(Display *display, Window window, const char *bufname)
+{
+  int event_base, error_base;
+  XEvent event;
+  Atom bufid = XInternAtom(display, bufname, False);
+
+  assert( XFixesQueryExtension(display, &event_base, &error_base) );
+  XFixesSelectSelectionInput(display, DefaultRootWindow(display), bufid, XFixesSetSelectionOwnerNotifyMask);
+
+  while (True)
+  {
+    XNextEvent(display, &event);
+
+    if (event.type == event_base + XFixesSelectionNotify &&
+        ((XFixesSelectionNotifyEvent*)&event)->selection == bufid)
+    {
+      printf("CLIPBOARD_CHANGE\n");
+      fflush(stdout);
+    }
+  }
+}
+
+int main(){
+  Display *display = XOpenDisplay(NULL);
+  Window window = DefaultRootWindow(display);
+  // WatchSelection(display,window,"PRIMARY");
+  WatchSelection(display,window,"CLIPBOARD");
+  XDestroyWindow(display, window);
+  XCloseDisplay(display);
+  return 0;
+}