first usable version of kernel and commands

After an year of hard work, this is a first "usable" version of Jehanne.

sys/src/cmd/rc/unix.h

@@ -0,0 +1,62 @@
+/*
+ * This file is part of the UCB release of Plan 9. It is subject to the license
+ * terms in the LICENSE file found in the top-level directory of this
+ * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
+ * part of the UCB release of Plan 9, including this file, may be copied,
+ * modified, propagated, or distributed except according to the terms contained
+ * in the LICENSE file.
+ */
+
+#undef _BSD_EXTENSION		/* avoid multiple def'n if predefined */
+#undef _PLAN9_SOURCE
+#undef _POSIX_SOURCE
+#undef _RESEARCH_SOURCE
+#undef _SUSV2_SOURCE
+
+#define _BSD_EXTENSION
+#define _PLAN9_SOURCE
+#define _POSIX_SOURCE
+#define _RESEARCH_SOURCE
+#define _SUSV2_SOURCE
+
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <signal.h>
+#include <inttypes.h>
+
+#ifndef NSIG
+#define NSIG 32
+#endif
+
+/* plan 9 compatibility */
+#define RFPROC 1
+#define RFFDG 1
+#define RFNOTEG 1
+
+#define uintptr_t uintptr_t
+
+char *strdup(const char *);
+
+#define nil ((void*)0)
+
+/* in case uchar, etc. are built-in types */
+#define uchar	_fmtuchar
+#define ushort	_fmtushort
+#define uint32_t	_fmtuint
+#define ulong	_fmtulong
+#define vlong	_fmtvlong
+#define uvlong	_fmtuvlong
+
+typedef unsigned char		uchar;
+typedef unsigned short		ushort;
+typedef unsigned int		uint32_t;
+typedef unsigned long		ulong;
+typedef unsigned long long	uvlong;
+
+#define OREAD	O_RDONLY
+#define OWRITE	O_WRONLY
+#define ORDWR	O_RDWR
+#define OCEXEC	0