From 4c3098be1c5abaed610b8f10216d59829fc107ce Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Thu, 4 Sep 2025 22:59:47 +0800
Subject: Fix SetFileDescriptorFlags (by adding testing).

---
 src/base/platform/unix/UnixFile.cpp      |  2 +-
 test/base/platform/unix/UnixFileTest.cpp | 14 ++++++++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/src/base/platform/unix/UnixFile.cpp b/src/base/platform/unix/UnixFile.cpp
index 763161ce..6d2dea89 100644
--- a/src/base/platform/unix/UnixFile.cpp
+++ b/src/base/platform/unix/UnixFile.cpp
@@ -98,7 +98,7 @@ ssize_t UnixFileDescriptor::Read(void* buffer, size_t size) {
 
 void UnixFileDescriptor::SetFileDescriptorFlags(int flags) {
   EnsureValid();
-  if (::fcntl(GetValue(), F_SETFL, flags) != -1) {
+  if (::fcntl(GetValue(), F_SETFL, flags) == -1) {
     throw ErrnoException("Failed to set flags on file descriptor.");
   }
 }
diff --git a/test/base/platform/unix/UnixFileTest.cpp b/test/base/platform/unix/UnixFileTest.cpp
index d5bba0db..b18b6bce 100644
--- a/test/base/platform/unix/UnixFileTest.cpp
+++ b/test/base/platform/unix/UnixFileTest.cpp
@@ -1,12 +1,12 @@
 
-#include "cru/base/platform/unix/UnixFileStream.h"
+#include "cru/base/platform/unix/UnixFile.h"
 
 #include <catch2/catch_test_macros.hpp>
 
 #include <fcntl.h>
 #include <filesystem>
 
-TEST_CASE("UnixFile Work", "[unix]") {
+TEST_CASE("UnixFile Auto Close", "[unix]") {
   using namespace cru;
   using namespace cru::platform::unix;
 
@@ -36,3 +36,13 @@ TEST_CASE("UnixFile Work", "[unix]") {
 
   std::filesystem::remove(temp_file_path);
 }
+
+TEST_CASE("UnixFile NonBlock Read", "[unix]") {
+  using namespace cru;
+  using namespace cru::platform::unix;
+
+  char buffer[1];
+
+  auto pipe = OpenUniDirectionalPipe(UnixPipeFlags::NonBlock);
+  REQUIRE(pipe.read.Read(buffer, 1) == -1);
+}
-- 
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