Index: libc/arch/ia32/src/syscall.c
===================================================================
--- libc/arch/ia32/src/syscall.c	(revision cc6f688f354a22e73aa08bf66a55f9faa4fea32c)
+++ libc/arch/ia32/src/syscall.c	(revision 7e557805bf047a9f3c55433d9e77f3cb63325752)
@@ -29,7 +29,7 @@
 #include <libc.h>
 
-unsigned int __syscall(const syscall_t id, const unsigned int p1, const unsigned int p2, const unsigned int p3)
+sysarg_t __syscall(const syscall_t id, const sysarg_t p1, const sysarg_t p2, const sysarg_t p3)
 {
-	unsigned int ret;
+	sysarg_t ret;
 	
 	asm volatile (
Index: libc/arch/mips32el/src/syscall.c
===================================================================
--- libc/arch/mips32el/src/syscall.c	(revision cc6f688f354a22e73aa08bf66a55f9faa4fea32c)
+++ libc/arch/mips32el/src/syscall.c	(revision 7e557805bf047a9f3c55433d9e77f3cb63325752)
@@ -29,11 +29,11 @@
 #include <libc.h>
 
-unsigned int __syscall(const syscall_t id, const unsigned int p1, const unsigned int p2, const unsigned int p3)
+sysarg_t __syscall(const syscall_t id, const sysarg_t p1, const sysarg_t p2, const sysarg_t p3)
 {
-	register unsigned int __mips_reg_a0 asm("$4") = p1;
-	register unsigned int __mips_reg_a1 asm("$5") = p2;
-	register unsigned int __mips_reg_a2 asm("$6") = p3;
-	register unsigned int __mips_reg_a3 asm("$7") = id;
-	register unsigned int __mips_reg_v0 asm("$2");
+	register sysarg_t __mips_reg_a0 asm("$4") = p1;
+	register sysarg_t __mips_reg_a1 asm("$5") = p2;
+	register sysarg_t __mips_reg_a2 asm("$6") = p3;
+	register sysarg_t __mips_reg_a3 asm("$7") = id;
+	register sysarg_t __mips_reg_v0 asm("$2");
 	
 	asm volatile (
Index: libc/generic/io.c
===================================================================
--- libc/generic/io.c	(revision cc6f688f354a22e73aa08bf66a55f9faa4fea32c)
+++ libc/generic/io.c	(revision 7e557805bf047a9f3c55433d9e77f3cb63325752)
@@ -44,4 +44,4 @@
 ssize_t write(int fd, const void * buf, size_t count)
 {
-	return __syscall(SYS_IO, (sysarg_t) fd, (sysarg_t) buf, (sysarg_t) count);
+	return (ssize_t) __syscall(SYS_IO, (sysarg_t) fd, (sysarg_t) buf, (sysarg_t) count);
 }
Index: libc/include/libc.h
===================================================================
--- libc/include/libc.h	(revision cc6f688f354a22e73aa08bf66a55f9faa4fea32c)
+++ libc/include/libc.h	(revision 7e557805bf047a9f3c55433d9e77f3cb63325752)
@@ -41,5 +41,5 @@
 extern void __main(void);
 extern void __exit(void);
-extern unsigned int __syscall(const syscall_t id, const sysarg_t p1, const sysarg_t p2, const sysarg_t p3);
+extern sysarg_t __syscall(const syscall_t id, const sysarg_t p1, const sysarg_t p2, const sysarg_t p3);
 
 
Index: libc/include/unistd.h
===================================================================
--- libc/include/unistd.h	(revision 7e557805bf047a9f3c55433d9e77f3cb63325752)
+++ libc/include/unistd.h	(revision 7e557805bf047a9f3c55433d9e77f3cb63325752)
@@ -0,0 +1,38 @@
+/*
+ * Copyright (C) 2005 Martin Decky
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __LIBC__UNISTD_H__
+#define __LIBC__UNISTD_H__
+
+#include <types.h>
+
+#define NULL 0
+
+extern ssize_t write(int fd, const void * buf, size_t count);
+
+#endif