From b14a87a785e4607559d0832b4af3550ffae64321 Mon Sep 17 00:00:00 2001
From: microcai <microcaicai@gmail.com>
Date: Mon, 6 Jan 2025 00:05:30 +0800
Subject: [PATCH] debug and fix iocp_asio

---
 example/unbufcpy/unbufcp5/unbufcp5.cpp | 32 +++++++++++---------------
 iocp_asio/src/iocp.cpp                 | 14 +++++++----
 2 files changed, 24 insertions(+), 22 deletions(-)

diff --git a/example/unbufcpy/unbufcp5/unbufcp5.cpp b/example/unbufcpy/unbufcp5/unbufcp5.cpp
index 21855d2..a2823b1 100644
--- a/example/unbufcpy/unbufcp5/unbufcp5.cpp
+++ b/example/unbufcpy/unbufcp5/unbufcp5.cpp
@@ -165,16 +165,10 @@ class FiberChannel
 	std::deque<FiberOVERLAPPED*> m_push_awaiting;
 };
 
-struct OverlappedBuffer : public FiberOVERLAPPED
-{
-	IOBuffer buf;
-};
-
 struct FileCopyer
 {
 	uint64_t cur_pos = 0;
 
-	std::array<OverlappedBuffer, PENDING_IO> buffers;
 	FiberChannel<int> chan;
 
 	FileCopyer(HANDLE iocp)
@@ -182,28 +176,30 @@ struct FileCopyer
 	{ 
 	}
 
-	void buffer_carrier(int buffer_index, HANDLE srcFile, HANDLE destFile, FiberChannel<int>& chan)
+	void buffer_carrier(HANDLE srcFile, HANDLE destFile, FiberChannel<int>& chan)
 	{
 		for (;;)
 		{
-			buffers[buffer_index].set_offset(cur_pos);
+			IOBuffer buf;
+			FiberOVERLAPPED ov;
+			ov.set_offset(cur_pos);
 			cur_pos += BUFFER_SIZE;
 
 			DWORD readbytes = 0;
-			auto ret = ReadFile(srcFile, buffers[buffer_index].buf, BUFFER_SIZE, &readbytes, &buffers[buffer_index]);
-			buffers[buffer_index].last_error = GetLastError();
-			if (!(!ret && buffers[buffer_index].last_error != ERROR_IO_PENDING))
-				readbytes = get_overlapped_result(buffers[buffer_index]);
-			if (buffers[buffer_index].last_error)
+			auto ret = ReadFile(srcFile, buf, BUFFER_SIZE, &readbytes, &ov);
+			ov.last_error = GetLastError();
+			if (!(!ret && ov.last_error != ERROR_IO_PENDING))
+				readbytes = get_overlapped_result(ov);
+			if (ov.last_error)
 			{
 				chan.push(1);
 				return;
 			}
 			DWORD written = 0;
-			ret = WriteFile(destFile, buffers[buffer_index].buf, (readbytes + PageSize - 1) & ~(PageSize - 1), &written, &buffers[buffer_index]);
-			buffers[buffer_index].last_error = GetLastError();
-			if (!(!ret && buffers[buffer_index].last_error != ERROR_IO_PENDING))
-				readbytes = get_overlapped_result(buffers[buffer_index]);
+			ret = WriteFile(destFile, buf, (readbytes + PageSize - 1) & ~(PageSize - 1), &written, &ov);
+			ov.last_error = GetLastError();
+			if (!(!ret && ov.last_error != ERROR_IO_PENDING))
+				written = get_overlapped_result(ov);
 		}
 	}
 
@@ -212,7 +208,7 @@ struct FileCopyer
 
 		for (int i = 0; i < PENDING_IO; i++)
 		{
-			create_detached_coroutine(std::bind(&FileCopyer::buffer_carrier, this, i, srcFile, destFile, std::ref(chan)));
+			create_detached_coroutine(std::bind(&FileCopyer::buffer_carrier, this, srcFile, destFile, std::ref(chan)));
 		}
 
 		// wait until completed.
diff --git a/iocp_asio/src/iocp.cpp b/iocp_asio/src/iocp.cpp
index 7613ea3..ec48cc9 100644
--- a/iocp_asio/src/iocp.cpp
+++ b/iocp_asio/src/iocp.cpp
@@ -888,6 +888,12 @@ IOCP_DECL BOOL ReadFile(
 	if (lpNumberOfBytesRead)
 		*lpNumberOfBytesRead = readed;
 
+	if (readed == 0)
+	{
+		SetLastError(ERROR_HANDLE_EOF);
+		return FALSE;
+	}
+
 	asio_operation* op = new asio_operation;
 	// op->lpCompletionRoutine = lpCompletionRoutine;
 	op->overlapped_ptr = lpOverlapped;
@@ -901,7 +907,7 @@ IOCP_DECL BOOL ReadFile(
 
 	SetLastError(ERROR_IO_PENDING);
 
-	return readed > 0;
+	return FALSE;
 }
 
 IOCP_DECL BOOL WriteFile(
@@ -921,7 +927,7 @@ IOCP_DECL BOOL WriteFile(
 
 	iocp_handle_emu_class* iocp = s->_iocp;
 
-	auto write_ret = write(s->native_handle(), lpBuffer, nNumberOfBytesToWrite);
+	auto write_ret = pwrite(s->native_handle(), lpBuffer, nNumberOfBytesToWrite, lpOverlapped->offset_64);
 
 	if (lpNumberOfBytesWritten)
 		*lpNumberOfBytesWritten = write_ret;
@@ -933,7 +939,7 @@ IOCP_DECL BOOL WriteFile(
 	op->overlapped_ptr = lpOverlapped;
 	lpOverlapped->Internal = reinterpret_cast<ULONG_PTR>(op);
 	op->CompletionKey = s->_completion_key;
-	op->last_error = errno;
+	op->last_error = write_ret <0 ? errno : 0;
 	op->NumberOfBytes = write_ret;
 
 	std::scoped_lock<std::mutex> l(iocp->result_mutex);
@@ -941,7 +947,7 @@ IOCP_DECL BOOL WriteFile(
 
 	SetLastError(ERROR_IO_PENDING);
 
-	return write_ret > 0;
+	return FALSE;
 }
 
 asio::io_context SOCKET_emu_class::internal_fake_io_context;