From 6a5ce475b80d697b130c912365cfc4c9d8e6fb7f Mon Sep 17 00:00:00 2001
From: Nekotekina <nekotekina@gmail.com>
Date: Sun, 19 Nov 2017 16:44:06 +0300
Subject: [PATCH] Implement fs::unshare (linux)

---
 Utilities/File.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Utilities/File.cpp b/Utilities/File.cpp
index 0511e9159d..da54fb7fd4 100644
--- a/Utilities/File.cpp
+++ b/Utilities/File.cpp
@@ -108,6 +108,7 @@ static fs::error to_error(DWORD e)
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/statvfs.h>
+#include <sys/file.h>
 #include <dirent.h>
 #include <fcntl.h>
 #include <libgen.h>
@@ -939,6 +940,13 @@ fs::file::file(const std::string& path, bs_t<open_mode> mode)
 		return;
 	}
 
+	if (test(mode & fs::unshare) && ::flock(fd, LOCK_EX | LOCK_NB) != 0)
+	{
+		g_tls_error = errno == EWOULDBLOCK ? fs::error::acces : to_error(errno);
+		::close(fd);
+		return;
+	}
+
 	class unix_file final : public file_base, public get_native_handle
 	{
 		const int m_fd;