new package: termux-x11

Utility to start https://github.com/termux/termux-x11 application.

x11-packages/termux-x11/build.sh

@@ -0,0 +1,12 @@
+TERMUX_PKG_HOMEPAGE=https://github.com/termux/x11-packages
+TERMUX_PKG_DESCRIPTION="Utility to start X11 Termux add-on"
+TERMUX_PKG_LICENSE="GPL-3.0" # same as Termux:X11 add-on app
+TERMUX_PKG_VERSION=1.0
+TERMUX_PKG_SKIP_SRC_EXTRACT=true
+TERMUX_PKG_DEPENDS="libwayland"
+
+termux_step_make_install() {
+	$CC $CFLAGS $CPPFLAGS -DTERMUX_PREFIX=\"$TERMUX_PREFIX\" \
+		$TERMUX_PKG_BUILDER_DIR/termux-x11.c -o $TERMUX_PREFIX/bin/termux-x11 \
+		$LDFLAGS -lwayland-client
+}

x11-packages/termux-x11/termux-x11.c

@@ -0,0 +1,90 @@
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <wayland-client.h>
+
+#ifndef TERMUX_PREFIX
+# define TERMUX_PREFIX "/data/data/com.termux/files/usr"
+#endif
+
+#ifndef TERMUX_X11_DIR
+# define TERMUX_X11_DIR "/data/data/com.termux.x11/"
+#endif
+
+int dir_exists(const char *dir) {
+	struct stat sb;
+	if (stat(dir, &sb) == 0 && S_ISDIR(sb.st_mode))
+		return 1;
+	return 0;
+}
+
+int connection_exists(void) {
+	struct wl_display *d = wl_display_connect(NULL);
+	if (d != NULL) {
+		wl_display_disconnect(d);
+		return 1;
+	}
+
+	return 0;
+}
+
+int start_server(char *argv[]) {
+	switch(fork()) {
+		case -1:
+			// Error
+			perror("fork");
+			return -1;
+			break;
+		case 0:
+			// Child
+			execv(argv[0], argv);
+			perror("execv");
+			exit(1);
+			return -1;
+		default:
+			//Parent
+			return 0;
+	}
+
+	// Should never reach this
+	return -1;
+}
+
+void start_xwayland(char *argv[]) {
+	argv[0] = TERMUX_PREFIX "/bin/Xwayland";
+	execv(argv[0], argv);
+	perror("execv");
+}
+
+int main(int argc, char *argv[]) {
+	if (!dir_exists(TERMUX_X11_DIR)) {
+		printf("Termux:X11 is not installed\n");
+		return 1;
+	}
+
+	char *server_argv[] = {TERMUX_PREFIX "/bin/am", "start", "-n", "com.termux.x11/.MainActivity", NULL};
+
+	if (!connection_exists()) {
+		if (start_server(server_argv) == -1) {
+			printf("Error starting Termux:X11\n");
+			return 1;
+		}
+	}
+
+	int e = 0, i = 0;
+	while(i++ < 10) {
+		if ((e = connection_exists())) {
+			start_xwayland(argv);
+			break;
+		}
+
+		sleep(1);
+	}
+
+	printf("Failed starting Termux:X11: timeout\n");
+
+	return 1;
+}