private void LockFd()

in csharp/NativeUtils/FileStream.cs [335:373]

32 lines of code
13 McCabe index (conditional complexity)


		private void LockFd(int fd, FileShare share, string path)
		{
			int sh = 0;
			share = share & (FileShare.ReadWrite | FileShare.Delete);
			// Better than nothing
			// But preferably should take own access method into account
			switch (share)
			{
				case FileShare.None:
					sh = LOCK_EX;
					break;

				case FileShare.Read:
				case FileShare.Write:
				case FileShare.ReadWrite:
				case FileShare.Delete:
					sh = LOCK_SH;
					break;
			}

			if (0 != sh && fd >= 0)
			{
				sh |= LOCK_NB;
				if (flock(fd, sh) < 0)
				{
					var exc = new Win32Exception();
					if (LogLevelLeast(DBG) && !path.Contains("lockfile"))
						Log($"Lock fail: {path} : {fd} : {sh} : {exc.NativeErrorCode}");

					if (EAGAIN == exc.NativeErrorCode)
						throw new IOException($"File is locked: {path}");

					throw new IOException($"Failed to take {(LOCK_EX == sh ? "Exclusive" : "Shared")} Lock for file: {path}, code: {exc.NativeErrorCode}");
				}

				if (LogLevelLeast(DBG))
					Log($"Lock ok: {path} : {fd} : {sh}");
			}
		}