[compiler-rt] [rtsan] Fix ioctl args in interceptor test (PR #154959)

[via llvm-commits]

https://github.com/davidtrevelyan updated https://github.com/llvm/llvm-project/pull/154959

>From d35ff601556fddae33de9eb91fcefd24e462858f Mon Sep 17 00:00:00 2001
From: David Trevelyan <david.trevelyan at gmail.com>
Date: Fri, 22 Aug 2025 15:13:32 +0100
Subject: [PATCH] [rtsan] Fix ioctl args in interceptor test

---
 .../rtsan/tests/rtsan_test_interceptors_posix.cpp | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp b/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
index 9b684e36e3b35..d69a4e74825f0 100644
--- a/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
+++ b/compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
@@ -753,15 +753,24 @@ TEST_F(RtsanOpenedFileTest, RewindDieWhenRealtime) {
 #endif
 
 TEST_F(RtsanOpenedFileTest, IoctlDiesWhenRealtime) {
-  auto Func = [this]() { ioctl(GetOpenFd(), FIONREAD); };
+  auto Func = [this]() {
+    int arg{};
+    ioctl(GetOpenFd(), FIONREAD, &arg);
+    EXPECT_THAT(arg, Ge(0));
+  };
   ExpectRealtimeDeath(Func, "ioctl");
   ExpectNonRealtimeSurvival(Func);
 }
 
+TEST_F(RtsanOpenedFileTest, IoctlBehavesWithoutOutputArg) {
+  const int result = ioctl(GetOpenFd(), FIONCLEX);
+  EXPECT_THAT(result, Ne(-1));
+}
+
 TEST_F(RtsanOpenedFileTest, IoctlBehavesWithOutputArg) {
   int arg{};
-  ioctl(GetOpenFd(), FIONREAD, &arg);
-
+  const int result = ioctl(GetOpenFd(), FIONREAD, &arg);
+  ASSERT_THAT(result, Ne(-1));
   EXPECT_THAT(arg, Ge(0));
 }