From df6eed7a02f63ba08879450c3d4199141bb7bed3 Mon Sep 17 00:00:00 2001
From: Carter Li <zhangsongcui3371@sina.com>
Date: Fri, 3 Jan 2025 09:35:48 +0800
Subject: [PATCH] TerminalSize (Linux): enable fast path when stdout is
 redirected.

---
 src/detection/terminalsize/terminalsize_linux.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/detection/terminalsize/terminalsize_linux.c b/src/detection/terminalsize/terminalsize_linux.c
index 70c29d558..cb6880f8d 100644
--- a/src/detection/terminalsize/terminalsize_linux.c
+++ b/src/detection/terminalsize/terminalsize_linux.c
@@ -2,6 +2,7 @@
 #include "common/io/io.h"
 
 #include <sys/ioctl.h>
+#include <fcntl.h>
 #include <unistd.h>
 
 #ifdef __sun
@@ -11,7 +12,11 @@
 bool ffDetectTerminalSize(FFTerminalSizeResult* result)
 {
     struct winsize winsize = {};
-    ioctl(STDOUT_FILENO, TIOCGWINSZ, &winsize);
+    static int ttyfd = STDOUT_FILENO;
+    if (!isatty(ttyfd))
+        ttyfd = open("/dev/tty", O_RDWR | O_NOCTTY | O_CLOEXEC);
+
+    ioctl(ttyfd, TIOCGWINSZ, &winsize);
 
     if (winsize.ws_row == 0 || winsize.ws_col == 0)
         ffGetTerminalResponse("\e[18t", 2, "\e[8;%hu;%hut", &winsize.ws_row, &winsize.ws_col);