From 76175e09ba0fa9f1185a8ff2324c5d6eb992a781 Mon Sep 17 00:00:00 2001
From: Lucas Chollet <lucas.chollet@free.fr>
Date: Mon, 2 Nov 2026 16:41:43 +0100
Subject: [PATCH] LibCore: Add wrappers for tc{get,set}winsize

On Serenity, this uses the equivalent LibC function, otherwise it
defaults to the pretty standard ioctl equivalent.

At the time of writing, it seems that only musl, BSDs and Serenity have
the standardized POSIX function.
---
 Userland/Libraries/LibCore/System.cpp | 25 +++++++++++++++++++++++++
 Userland/Libraries/LibCore/System.h   |  2 ++
 2 files changed, 27 insertions(+)

diff --git a/Userland/Libraries/LibCore/System.cpp b/Userland/Libraries/LibCore/System.cpp
index 281390f77bf..7e7cd43eb76 100644
--- a/Userland/Libraries/LibCore/System.cpp
+++ b/Userland/Libraries/LibCore/System.cpp
@@ -826,6 +826,31 @@ ErrorOr<void> tcsetattr(int fd, int optional_actions, struct termios const& ios)
     return {};
 }
 
+ErrorOr<winsize> tcgetwinsize(int fd)
+{
+    winsize ws {};
+#ifdef AK_OS_SERENITY
+    if (::tcgetwinsize(fd, &ws) < 0)
+        return Error::from_syscall("tcgetwinsize"sv, -errno);
+#else
+    if (::ioctl(fd, TIOCGWINSZ, &ws) < 0)
+        return Error::from_syscall("ioctl"sv, -errno);
+#endif
+    return ws;
+}
+
+ErrorOr<void> tcsetwinsize(int fd, winsize const& ws)
+{
+#ifdef AK_OS_SERENITY
+    if (::tcsetwinsize(fd, &ws) < 0)
+        return Error::from_syscall("tcsetwinsize"sv, -errno);
+#else
+    if (::ioctl(fd, TIOCSWINSZ, &ws) < 0)
+        return Error::from_syscall("ioctl"sv, -errno);
+#endif
+    return {};
+}
+
 ErrorOr<int> tcsetpgrp(int fd, pid_t pgrp)
 {
     int rc = ::tcsetpgrp(fd, pgrp);
diff --git a/Userland/Libraries/LibCore/System.h b/Userland/Libraries/LibCore/System.h
index 8c4b9ce7109..b70e95c193f 100644
--- a/Userland/Libraries/LibCore/System.h
+++ b/Userland/Libraries/LibCore/System.h
@@ -149,6 +149,8 @@ ErrorOr<ByteString> getcwd();
 ErrorOr<void> ioctl(int fd, unsigned request, ...);
 ErrorOr<struct termios> tcgetattr(int fd);
 ErrorOr<void> tcsetattr(int fd, int optional_actions, struct termios const&);
+ErrorOr<winsize> tcgetwinsize(int fd);
+ErrorOr<void> tcsetwinsize(int fd, winsize const&);
 ErrorOr<int> tcsetpgrp(int fd, pid_t pgrp);
 ErrorOr<void> chmod(StringView pathname, mode_t mode);
 ErrorOr<void> lchown(StringView pathname, uid_t uid, gid_t gid);