From bd81e3c71f24de100d67368747c0ed8bb604a8ba Mon Sep 17 00:00:00 2001
From: Sungjoon Moon <sumoon@seoulsaram.org>
Date: Sun, 8 Feb 2026 01:17:47 +0900
Subject: [PATCH] commands/exec: redirect child stdio to /dev/null

Children spawned via exec inherit sway's stdio pointing to the launch
TTY. wlroots puts the TTY in KD_GRAPHICS mode, where writes block,
causing programs that write to stdout/stderr on startup (e.g. Electron
apps) to hang.
---
 sway/commands/exec_always.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/sway/commands/exec_always.c b/sway/commands/exec_always.c
index a966696c5..8a0d2bdd6 100644
--- a/sway/commands/exec_always.c
+++ b/sway/commands/exec_always.c
@@ -1,3 +1,4 @@
+#include <fcntl.h>
 #include <stdlib.h>
 #include <stdint.h>
 #include <string.h>
@@ -53,6 +54,14 @@ struct cmd_results *cmd_exec_process(int argc, char **argv) {
 	if (child == 0) {
 		setsid();
 
+		int devnull = open("/dev/null", O_RDWR);
+		if (devnull > STDERR_FILENO) {
+			dup2(devnull, STDIN_FILENO);
+			dup2(devnull, STDOUT_FILENO);
+			dup2(devnull, STDERR_FILENO);
+			close(devnull);
+		}
+
 		if (ctx) {
 			const char *token = launcher_ctx_get_token_name(ctx);
 			setenv("XDG_ACTIVATION_TOKEN", token, 1);