From 68874a617b5f6b43480f87bf18b681605a2f6f8c Mon Sep 17 00:00:00 2001
From: Xu Meng <mengxumx@cn.ibm.com>
Date: Fri, 6 Dec 2019 20:54:00 -0600
Subject: src: fix the false isatty() issue on IBMi

On IBMi PASE isatty() always returns true for stdin, stdout and stderr.
Use ioctl() instead to identify whether it's actually a TTY.

PR-URL: https://github.com/nodejs/node/pull/30829
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: David Carlier <devnexen@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
---
 src/node.cc | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/node.cc b/src/node.cc
index 91f07e447f..b44f021084 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -108,6 +108,9 @@
 #include <unistd.h>        // STDIN_FILENO, STDERR_FILENO
 #endif
 
+#ifdef __PASE__
+#include <sys/ioctl.h>  // ioctl
+#endif
 // ========== global C++ headers ==========
 
 #include <cerrno>
@@ -555,7 +558,14 @@ inline void PlatformInit() {
     while (s.flags == -1 && errno == EINTR);  // NOLINT
     CHECK_NE(s.flags, -1);
 
+#ifdef __PASE__
+    // On IBMi PASE isatty() always returns true for stdin, stdout and stderr.
+    // Use ioctl() instead to identify whether it's actually a TTY.
+    if (ioctl(fd, TXISATTY + 0x81, nullptr) == -1 && errno == ENOTTY)
+      continue;
+#else
     if (!isatty(fd)) continue;
+#endif
     s.isatty = true;
 
     do
-- 
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