From ddbc0c1b37f349abdac875e56a1f0c0fab9884dc Mon Sep 17 00:00:00 2001
From: greatroar <61184462+greatroar@users.noreply.github.com>
Date: Thu, 25 May 2023 17:20:42 +0200
Subject: [PATCH] termstatus: Fix IsProcessBackground for 64-bit big-endian
 Linux

Fixes #4223. Verified with QEMU on linux/amd64.
---
 internal/ui/termstatus/background_linux.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/internal/ui/termstatus/background_linux.go b/internal/ui/termstatus/background_linux.go
index 2c32faf17..db96c2c53 100644
--- a/internal/ui/termstatus/background_linux.go
+++ b/internal/ui/termstatus/background_linux.go
@@ -18,6 +18,10 @@ func IsProcessBackground(fd uintptr) bool {
 }
 
 func isProcessBackground(fd uintptr) (bool, error) {
-	pid, err := unix.IoctlGetInt(int(fd), unix.TIOCGPGRP)
-	return pid != unix.Getpgrp(), err
+	// We need to use IoctlGetUint32 here, because pid_t is 32-bit even on
+	// 64-bit Linux. IoctlGetInt doesn't work on big-endian platforms:
+	// https://github.com/golang/go/issues/45585
+	// https://github.com/golang/go/issues/60429
+	pid, err := unix.IoctlGetUint32(int(fd), unix.TIOCGPGRP)
+	return int(pid) != unix.Getpgrp(), err
 }