From 74ef06cb92d18079f5733083307e508efc85b9b3 Mon Sep 17 00:00:00 2001
From: Martin Ridgers <martin.ridgers@epicgames.com>
Date: Wed, 15 Sep 2021 16:29:45 +0200
Subject: Implemented PathFromHandle() for Linux

---
 zencore/filesystem.cpp | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'zencore/filesystem.cpp')

diff --git a/zencore/filesystem.cpp b/zencore/filesystem.cpp
index 329cc241d..981935c55 100644
--- a/zencore/filesystem.cpp
+++ b/zencore/filesystem.cpp
@@ -605,6 +605,7 @@ FileSystemTraversal::TraverseFileSystem(const std::filesystem::path& RootDir, Tr
 std::filesystem::path
 PathFromHandle(void* NativeHandle)
 {
+#if ZEN_PLATFORM_WINDOWS
 	if (NativeHandle == nullptr || NativeHandle == INVALID_HANDLE_VALUE)
 	{
 		return std::filesystem::path();
@@ -618,6 +619,18 @@ PathFromHandle(void* NativeHandle)
 	const DWORD FinalLength = GetFinalPathNameByHandleW(NativeHandle, FullPath.data(), RequiredLengthIncludingNul, FILE_NAME_OPENED);
 
 	return FullPath;
+#elif ZEN_PLATFORM_LINUX
+	char Buffer[256];
+	sprintf(Buffer, "/proc/%d/fd/%d", getpid(), int(uintptr_t(NativeHandle)));
+	ssize_t BytesRead = readlink(Buffer, Buffer, sizeof(Buffer) - 1);
+	if (BytesRead <= 0)
+		return std::filesystem::path();
+
+	Buffer[BytesRead] = '\0';
+	return Buffer;
+#else
+#	error Unimplemented platform
+#endif // ZEN_PLATFORM_WINDOWS
 }
 
 std::filesystem::path
-- 
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