Index: src/OFFile.m
==================================================================
--- src/OFFile.m
+++ src/OFFile.m
@@ -1088,19 +1088,22 @@
 	if (_fd == -1 || _atEndOfStream)
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length];
 
 #ifndef _WIN32
-	if (write(_fd, buffer, length) < length)
+	if (length > SSIZE_MAX)
+		@throw [OFOutOfRangeException exception];
+
+	if (write(_fd, buffer, length) != (ssize_t)length)
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length
 							     errNo: errno];
 #else
-	if (length > UINT_MAX)
+	if (length > INT_MAX)
 		@throw [OFOutOfRangeException exception];
 
-	if (write(_fd, buffer, (unsigned int)length) < length)
+	if (write(_fd, buffer, (int)length) != (int)length)
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length
 							     errNo: errno];
 #endif
 }

Index: src/OFProcess.m
==================================================================
--- src/OFProcess.m
+++ src/OFProcess.m
@@ -496,11 +496,14 @@
 #ifndef _WIN32
 	if (_writePipe[1] == -1 || _atEndOfStream)
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length];
 
-	if (write(_writePipe[1], buffer, length) < length)
+	if (length > SSIZE_MAX)
+		@throw [OFOutOfRangeException exception];
+
+	if (write(_writePipe[1], buffer, length) != (ssize_t)length)
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length
 							     errNo: errno];
 #else
 	DWORD ret;
@@ -511,11 +514,11 @@
 	if (_writePipe[1] == NULL || _atEndOfStream)
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length];
 
 	if (!WriteFile(_writePipe[1], buffer, (DWORD)length, &ret, NULL) ||
-	    ret < length) {
+	    ret != (DWORD)length) {
 		int errNo = 0;
 
 		if (GetLastError() == ERROR_BROKEN_PIPE)
 			errNo = EPIPE;
 

Index: src/OFStdIOStream.m
==================================================================
--- src/OFStdIOStream.m
+++ src/OFStdIOStream.m
@@ -130,19 +130,22 @@
 	if (_fd == -1 || _atEndOfStream)
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length];
 
 #ifndef _WIN32
-	if (write(_fd, buffer, length) < length)
+	if (length > SSIZE_MAX)
+		@throw [OFOutOfRangeException exception];
+
+	if (write(_fd, buffer, length) != (ssize_t)length)
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length
 							     errNo: errno];
 #else
-	if (length > UINT_MAX)
+	if (length > INT_MAX)
 		@throw [OFOutOfRangeException exception];
 
-	if (write(_fd, buffer, (unsigned int)length) < length)
+	if (write(_fd, buffer, (int)length) != (int)length)
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length
 							     errNo: errno];
 #endif
 }

Index: src/OFStreamSocket.m
==================================================================
--- src/OFStreamSocket.m
+++ src/OFStreamSocket.m
@@ -99,20 +99,23 @@
 		@throw [OFWriteFailedException exceptionWithObject: self
 						   requestedLength: length
 							     errNo: ENOTCONN];
 
 #ifndef _WIN32
-	if (send(_socket, buffer, length, 0) < length)
+	if (length > SSIZE_MAX)
+		@throw [OFOutOfRangeException exception];
+
+	if (send(_socket, buffer, length, 0) != (ssize_t)length)
 		@throw [OFWriteFailedException
 		    exceptionWithObject: self
 			requestedLength: length
 				  errNo: of_socket_errno()];
 #else
-	if (length > UINT_MAX)
+	if (length > INT_MAX)
 		@throw [OFOutOfRangeException exception];
 
-	if (send(_socket, buffer, (unsigned int)length, 0) < length)
+	if (send(_socket, buffer, (int)length, 0) != (int)length)
 		@throw [OFWriteFailedException
 		    exceptionWithObject: self
 			requestedLength: length
 				  errNo: of_socket_errno()];
 #endif

Index: src/OFUDPSocket.m
==================================================================
--- src/OFUDPSocket.m
+++ src/OFUDPSocket.m
@@ -539,22 +539,27 @@
 {
 	if (_socket == INVALID_SOCKET)
 		@throw [OFNotOpenException exceptionWithObject: self];
 
 #ifndef _WIN32
+	if (length > SSIZE_MAX)
+		@throw [OFOutOfRangeException exception];
+
 	if (sendto(_socket, buffer, length, 0,
-	    (struct sockaddr*)&receiver->address, receiver->length) < length)
+	    (struct sockaddr*)&receiver->address,
+	    receiver->length) != (ssize_t)length)
 		@throw [OFWriteFailedException
 		    exceptionWithObject: self
 			requestedLength: length
 				  errNo: of_socket_errno()];
 #else
 	if (length > INT_MAX)
 		@throw [OFOutOfRangeException exception];
 
 	if (sendto(_socket, buffer, (int)length, 0,
-	    (struct sockaddr*)&receiver->address, receiver->length) < length)
+	    (struct sockaddr*)&receiver->address,
+	    receiver->length) != (int)length)
 		@throw [OFWriteFailedException
 		    exceptionWithObject: self
 			requestedLength: length
 				  errNo: of_socket_errno()];
 #endif