Index: src/OFStdIOStream+Private.h
==================================================================
--- src/OFStdIOStream+Private.h
+++ src/OFStdIOStream+Private.h
@@ -17,9 +17,15 @@
 #import "OFStdIOStream.h"
 
 OF_ASSUME_NONNULL_BEGIN
 
 @interface OFStdIOStream ()
+#if !defined(OF_MORPHOS) || defined(OF_IXEMUL)
 - (instancetype)of_initWithFileDescriptor: (int)fd OF_METHOD_FAMILY(init);
+#else
+- (instancetype)of_initWithFileDescriptor: (long)handle
+				 closable: (bool)closable
+    OF_METHOD_FAMILY(init);
+#endif
 @end
 
 OF_ASSUME_NONNULL_END

Index: src/OFStdIOStream.h
==================================================================
--- src/OFStdIOStream.h
+++ src/OFStdIOStream.h
@@ -29,11 +29,16 @@
 #ifdef OF_STDIO_STREAM_WIN32_CONSOLE_H
 OF_SUBCLASSING_RESTRICTED
 #endif
 @interface OFStdIOStream: OFStream
 {
-	int  _fd;
+#if !defined(OF_MORPHOS) || defined(OF_IXEMUL)
+	int _fd;
+#else
+	long _fd;
+	bool _closable;
+#endif
 	bool _atEndOfStream;
 }
 
 - init OF_UNAVAILABLE;
 

Index: src/OFStdIOStream.m
==================================================================
--- src/OFStdIOStream.m
+++ src/OFStdIOStream.m
@@ -47,11 +47,10 @@
 
 # define INVALID_FD 0
 # define getpid() ((int)SysBase->ThisTask)
 # define read(fd, buf, len) Read(fd, buf, len)
 # define write(fd, buf, len) Write(fd, buf, len)
-# define close(fd) Close(fd)
 
 extern struct ExecBase *SysBase;
 #endif
 
 #ifndef INVALID_FD
@@ -68,10 +67,19 @@
 #endif
 
 OFStdIOStream *of_stdin = nil;
 OFStdIOStream *of_stdout = nil;
 OFStdIOStream *of_stderr = nil;
+
+#if defined(OF_MORPHOS) && !defined(OF_IXEMUL)
+OF_DESTRUCTOR()
+{
+	[of_stdin dealloc];
+	[of_stdout dealloc];
+	[of_stderr dealloc];
+}
+#endif
 
 void
 of_log(OFConstantString *format, ...)
 {
 	void *pool = objc_autoreleasePoolPush();
@@ -101,30 +109,76 @@
 # if !defined(OF_MORPHOS) || defined(OF_IXEMUL)
 	of_stdin = [[OFStdIOStream alloc] of_initWithFileDescriptor: 0];
 	of_stdout = [[OFStdIOStream alloc] of_initWithFileDescriptor: 1];
 	of_stderr = [[OFStdIOStream alloc] of_initWithFileDescriptor: 2];
 # else
-	of_stdin = [[OFStdIOStream alloc] of_initWithFileDescriptor: Input()];
-	of_stdout = [[OFStdIOStream alloc] of_initWithFileDescriptor: Output()];
-	of_stderr = [[OFStdIOStream alloc] of_initWithFileDescriptor: Output()];
+	BPTR input = Input(), output = Output();
+	BPTR error = ((struct Process *)SysBase->ThisTask)->pr_CES;
+	bool inputClosable = false, outputClosable = false,
+	    errorClosable = false;
+
+	if (input == INVALID_FD) {
+		input = Open("*", MODE_OLDFILE);
+		inputClosable = true;
+	}
+
+	if (output == INVALID_FD) {
+		output = Open("*", MODE_OLDFILE);
+		outputClosable = true;
+	}
+
+	if (error == INVALID_FD) {
+		error = Open("*", MODE_OLDFILE);
+		errorClosable = true;
+	}
+
+	of_stdin = [[OFStdIOStream alloc]
+	    of_initWithFileDescriptor: input
+			     closable: inputClosable];
+	of_stdout = [[OFStdIOStream alloc]
+	    of_initWithFileDescriptor: output
+			     closable: outputClosable];
+	of_stderr = [[OFStdIOStream alloc]
+	    of_initWithFileDescriptor: error
+			     closable: errorClosable];
 # endif
 }
 #endif
 
 - init
 {
 	OF_INVALID_INIT_METHOD
 }
 
+#if !defined(OF_MORPHOS) || defined(OF_IXEMUL)
 - (instancetype)of_initWithFileDescriptor: (int)fd
 {
 	self = [super init];
 
 	_fd = fd;
 
 	return self;
 }
+#else
+- (instancetype)of_initWithFileDescriptor: (long)fd
+				 closable: (bool)closable
+{
+	self = [super init];
+
+	_fd = fd;
+	_closable = closable;
+
+	return self;
+}
+#endif
+
+- (void)dealloc
+{
+	[self close];
+
+	[super dealloc];
+}
 
 - (bool)lowlevelIsAtEndOfStream
 {
 	if (_fd == INVALID_FD)
 		return true;
@@ -200,12 +254,17 @@
 }
 #endif
 
 - (void)close
 {
+#if !defined(OF_MORPHOS) || defined(OF_IXEMUL)
 	if (_fd != INVALID_FD)
 		close(_fd);
+#else
+	if (_closable && _fd != INVALID_FD)
+		Close(_fd);
+#endif
 
 	_fd = INVALID_FD;
 
 	[super close];
 }
@@ -227,15 +286,10 @@
 - (unsigned int)retainCount
 {
 	return OF_RETAIN_COUNT_MAX;
 }
 
-- (void)dealloc
-{
-	OF_DEALLOC_UNSUPPORTED
-}
-
 - (int)columns
 {
 #if defined(HAVE_SYS_IOCTL_H) && defined(TIOCGWINSZ)
 	struct winsize ws;