revert of mass delete of the posix subsystem. perhaps there is hope for it yet.

svn path=/trunk/; revision=3674

posix/include/ucontext.h

@@ -0,0 +1,62 @@
+/* $Id: ucontext.h,v 1.4 2002/10/29 04:45:25 rex Exp $
+ */
+/*
+ * ucontext.h
+ *
+ * user context. Conforming to the Single UNIX(r) Specification Version 2,
+ * System Interface & Headers Issue 5
+ *
+ * This file is part of the ReactOS Operating System.
+ *
+ * Contributors:
+ *  Created by KJK::Hyperion <noog@libero.it>
+ *
+ *  THIS SOFTWARE IS NOT COPYRIGHTED
+ *
+ *  This source code is offered for use in the public domain. You may
+ *  use, modify or distribute it freely.
+ *
+ *  This code is distributed in the hope that it will be useful but
+ *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
+ *  DISCLAMED. This includes but is not limited to warranties of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ */
+#ifndef __UCONTEXT_H_INCLUDED__
+#define __UCONTEXT_H_INCLUDED__
+
+/* INCLUDES */
+#include <signal.h>
+
+/* OBJECTS */
+
+/* TYPES */
+typedef void * mcontext_t;
+
+typedef struct __tagucontext_t ucontext_t;
+
+struct __tagucontext_t
+{
+ ucontext_t *uc_link;     /* pointer to the context that will be resumed
+                             when this context returns */
+ sigset_t    uc_sigmask;  /* the set of signals that are blocked when this
+                             context is active */
+ stack_t     uc_stack;    /* the stack used by this context */
+ mcontext_t  uc_mcontext; /* a machine-specific representation of the saved
+                             context */
+};
+
+/* CONSTANTS */
+
+/* PROTOTYPES */
+int  getcontext(ucontext_t *);
+int  setcontext(const ucontext_t *);
+void makecontext(ucontext_t *, (void *)(), int, ...);
+int  swapcontext(ucontext_t *, const ucontext_t *);
+
+/* MACROS */
+
+#endif /* __UCONTEXT_H_INCLUDED__ */
+
+/* EOF */
+