From 2afc202be27827fe0b81a6f13758ba5b051b451e Mon Sep 17 00:00:00 2001
From: Martin Ridgers <martin.ridgers@epicgames.com>
Date: Thu, 28 Oct 2021 10:29:13 +0200
Subject: LockFile implementation for Linux

---
 zenstore/basicfile.cpp | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'zenstore/basicfile.cpp')

diff --git a/zenstore/basicfile.cpp b/zenstore/basicfile.cpp
index c6cf9fc43..598cfd54c 100644
--- a/zenstore/basicfile.cpp
+++ b/zenstore/basicfile.cpp
@@ -14,6 +14,7 @@
 #else
 #	include <sys/stat.h>
 #	include <fcntl.h>
+#	include <sys/file.h>
 #endif
 
 #include <fmt/format.h>
@@ -338,6 +339,7 @@ LockFile::~LockFile()
 void
 LockFile::Create(std::filesystem::path FileName, CbObject Payload, std::error_code& Ec)
 {
+#if ZEN_PLATFORM_WINDOWS
 	Ec.clear();
 
 	const DWORD dwCreationDisposition = CREATE_ALWAYS;
@@ -360,6 +362,26 @@ LockFile::Create(std::filesystem::path FileName, CbObject Payload, std::error_co
 
 		return;
 	}
+#elif ZEN_PLATFORM_LINUX
+	int Fd = open(FileName.c_str(), O_RDWR|O_CREAT, 0666);
+	if (Fd < 0)
+	{
+		Ec = zen::MakeErrorCodeFromLastError();
+		return;
+	}
+
+	int LockRet = flock(Fd, LOCK_EX);
+	if (LockRet < 0)
+	{
+		Ec = zen::MakeErrorCodeFromLastError();
+		close(Fd);
+		return;
+	}
+
+	void* FileHandle = (void*)uintptr_t(Fd);
+#else
+#	error check flock() support
+#endif
 
 	m_FileHandle = FileHandle;
 
-- 
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