Expose screenshooting as an interface, drop SIGUSR hack.
This pulls in a bit of extra infrastructure for discovering adertised objects on the
client side.
diff --git a/screenshot.c b/screenshot.c
new file mode 100644
index 0000000..7c69b85
--- /dev/null
+++ b/screenshot.c
@@ -0,0 +1,84 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <glib.h>
+
+#include "wayland-client.h"
+#include "wayland-glib.h"
+
+/* The screenshooter is a good example of a custom object exposed by
+ * the compositor and serves as a test bed for implementing client
+ * side marshalling outside libwayland.so */
+
+static const char socket_name[] = "\0wayland";
+
+struct screenshooter {
+ uint32_t id;
+ struct wl_display *display;
+};
+
+static struct screenshooter *
+screenshooter_create(struct wl_display *display)
+{
+ struct screenshooter *screenshooter;
+ uint32_t id;
+
+ id = wl_display_get_object_id(display, "screenshooter");
+ if (id == 0) {
+ fprintf(stderr, "server doesn't support screenshooter interface\n");
+ return NULL;
+ }
+
+ screenshooter = malloc(sizeof screenshooter);
+ if (screenshooter == NULL)
+ return NULL;
+
+ screenshooter->id = id;
+ screenshooter->display = display;
+
+ return screenshooter;
+}
+
+#define SCREENSHOOTER_SHOOT 0
+
+static void
+screenshooter_shoot(struct screenshooter *screenshooter)
+{
+ uint32_t request[2];
+
+ request[0] = screenshooter->id;
+ request[1] = SCREENSHOOTER_SHOOT | ((sizeof request) << 16);
+
+ wl_display_write(screenshooter->display,
+ request, sizeof request);
+}
+
+int main(int argc, char *argv[])
+{
+ struct wl_display *display;
+ GMainLoop *loop;
+ GSource *source;
+ struct screenshooter *s;
+
+ display = wl_display_create(socket_name);
+ if (display == NULL) {
+ fprintf(stderr, "failed to create display: %m\n");
+ return -1;
+ }
+
+ loop = g_main_loop_new(NULL, FALSE);
+ source = wayland_source_new(display);
+ g_source_attach(source, NULL);
+
+ s = screenshooter_create(display);
+ if (s == NULL)
+ exit(-1);
+
+ screenshooter_shoot(s);
+
+ g_main_loop_run(loop);
+
+ return 0;
+}