xwayland: set CLOEXEC on /dev/null FD
This avoids leaking the FD to Xwayland and its children.
-#define _POSIX_C_SOURCE 200112L
+#define _POSIX_C_SOURCE 200809L
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
@@ -92,7 +92,7 @@ _Noreturn static void exec_xwayland(struct wlr_xwayland *wlr_xwayland) {
// Closes stdout/stderr depending on log verbosity
enum wlr_log_importance verbosity = wlr_log_get_verbosity();
- int devnull = open("/dev/null", O_WRONLY | O_CREAT, 0666);
+ int devnull = open("/dev/null", O_WRONLY | O_CREAT | O_CLOEXEC, 0666);
if (devnull < 0) {
wlr_log_errno(WLR_ERROR, "XWayland: failed to open /dev/null");
_exit(EXIT_FAILURE);
