@b4n approved this pull request.

Apart from the nitpicking below, LGTM

In src/socket.c:

>  
 	if (utils_is_file_writable(real_path) != 0)
 	{	/* if real_path is not writable for us, fall back to ~/.config/geany/geany_socket_*_* */
 		/* instead of creating a symlink and print a warning */
 		g_warning("Socket %s could not be written, using %s as fallback.", real_path, path);
 		SETPTR(real_path, g_strdup(path));
 	}
-	/* create a symlink in e.g. ~/.config/geany/geany_socket_hostname__0 to /tmp/geany_socket.499602d2 */
+	/* create a symlink in e.g. ~/.config/geany/geany_socket_hostname__0 to
+	 * /var/run/user/1000/geany/geany_socket_hostname__0 */

the filename in /var in this comment is not correct anymore

In src/socket.c:

> -	 * in case the configuration directory is located on a network file system or any other
-	 * file system which doesn't support sockets, we just link the socket there and create the
-	 * real socket in the system's tmp directory assuming it supports sockets */
-	real_path = g_strdup_printf("%s%cgeany_socket.%08x",
-		g_get_tmp_dir(), G_DIR_SEPARATOR, g_random_int());
+	/* Try to place the socket in XDG_RUNTIME_DIR, according to XDG Base
+	 * Directory Specification, see
+	 * https://specifications.freedesktop.org/basedir-spec/latest.
+	 * If that fails, we try to use /tmp as a fallback. The last resort
+	 * is the configuration directory. But the other directories
+	 * are preferred in case the configuration directory is located on
+	 * a network file system or any other file system which doesn't
+	 * support sockets (see #1888561). Append a random int to
+	 * prevent clashes with other instances on the system. */
+	real_dir = g_build_filename(g_get_user_runtime_dir(), "geany", NULL);
+	val = utils_mkdir(real_dir, FALSE);

ideally you'd increase the cope of the saved_errno variables en use that as it's a better variable name.

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