Wayland clipboard sync (xvfb -> Wayland)

clipnotify.c

@@ -0,0 +1,96 @@
+#include <X11/Xatom.h>
+#include <X11/Xlib.h>
+#include <X11/extensions/Xfixes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static enum selections {
+    NONE = 0,
+    SELECTION_CLIPBOARD = (1 << 0),
+    SELECTION_PRIMARY = (1 << 1),
+    SELECTION_SECONDARY = (1 << 2)
+} selections = NONE;
+
+static int loop;
+
+int main(int argc, char *argv[]) {
+    static const char *usage =
+        "%s: Notify by exiting on clipboard events.\n\n"
+        "  -l    Instead of exiting, print a newline when a new selection is available.\n"
+        "  -s    The selection to use. Available selections:\n"
+        "        clipboard, primary, secondary\n"
+        "        The default is to monitor clipboard and primary.\n";
+    Display *disp;
+    Window root;
+    Atom clip;
+    XEvent evt;
+    int opt;
+
+    while ((opt = getopt(argc, argv, "hs:l")) != -1) {
+        switch (opt) {
+            case 'h':
+                printf(usage, argv[0]);
+                return EXIT_SUCCESS;
+            case 'l':
+                loop = 1;
+                break;
+            case 's': {
+                char *token = strtok(optarg, ",");
+                while (token != NULL) {
+                    if (strcmp(token, "clipboard") == 0) {
+                        selections |= SELECTION_CLIPBOARD;
+                    } else if (strcmp(token, "primary") == 0) {
+                        selections |= SELECTION_PRIMARY;
+                    } else if (strcmp(token, "secondary") == 0) {
+                        selections |= SELECTION_SECONDARY;
+                    } else {
+                        fprintf(stderr, "Unknown selection '%s'\n", token);
+                        return EXIT_FAILURE;
+                    }
+                    token = strtok(NULL, ",");
+                }
+                break;
+            }
+            default:
+                fprintf(stderr, usage, argv[0]);
+                return EXIT_FAILURE;
+        }
+    }
+
+    disp = XOpenDisplay(NULL);
+    if (!disp) {
+        fprintf(stderr, "Can't open X display\n");
+        return EXIT_FAILURE;
+    }
+
+    root = DefaultRootWindow(disp);
+
+    clip = XInternAtom(disp, "CLIPBOARD", False);
+
+    /* <= 1.0.2 backwards compatibility */
+    if (!selections)
+        selections = SELECTION_CLIPBOARD | SELECTION_PRIMARY;
+
+    if (selections & SELECTION_CLIPBOARD)
+        XFixesSelectSelectionInput(disp, root, clip,
+                                   XFixesSetSelectionOwnerNotifyMask);
+    if (selections & SELECTION_PRIMARY)
+        XFixesSelectSelectionInput(disp, root, XA_PRIMARY,
+                                   XFixesSetSelectionOwnerNotifyMask);
+    if (selections & SELECTION_SECONDARY)
+        XFixesSelectSelectionInput(disp, root, XA_SECONDARY,
+                                   XFixesSetSelectionOwnerNotifyMask);
+
+    if (loop) {
+        (void)setvbuf(stdout, NULL, _IONBF, 0);
+        do {
+            XNextEvent(disp, &evt);
+            printf("\n");
+        } while (1);
+    } else {
+        XNextEvent(disp, &evt);
+    }
+    XCloseDisplay(disp);
+}