From a8dc90eaaa5e6474beac828558d969b1aafee4af Mon Sep 17 00:00:00 2001
From: Florian Fainelli <florian@openwrt.org>
Date: Wed, 9 Jan 2013 16:17:21 +0100
Subject: libc: add {get,set,swap,make}context user context manipulation
functions
Add the obsolescent SUSv3 family of user context manipulating functions
for arm, i386, mips, x86_64.
Signed-off-by: Timon ter Braak <timonterbraak@gmail.com>
Signed-off-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
---
include/ucontext.h | 32 +++++++++++++++++++++++++++++---
1 file changed, 29 insertions(+), 3 deletions(-)
(limited to 'include')
diff --git a/include/ucontext.h b/include/ucontext.h
index 14a12704e..f11db7794 100644
--- a/include/ucontext.h
+++ b/include/ucontext.h
@@ -15,17 +15,43 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
+/* The System V ABI user-level context switching support functions
+ are marked obsolescent by SuSv3. */
+
#ifndef _UCONTEXT_H
#define _UCONTEXT_H 1
#include <features.h>
+#ifdef __UCLIBC_HAS_CONTEXT_FUNCS__
+
/* Get machine dependent definition of data structures. */
#include <sys/ucontext.h>
-/* The System V ABI user-level context switching support functions
- * are marked obsolescent by SuSv3, and are not implemented by
- * uClibc. This header is therefore empty. */
+__BEGIN_DECLS
+
+/* Get user context and store it in variable pointed to by UCP. */
+extern int getcontext (ucontext_t *__ucp) __THROW;
+
+/* Set user context from information of variable pointed to by UCP. */
+extern int setcontext (const ucontext_t *__ucp) __THROW;
+
+/* Save current context in context variable pointed to by OUCP and set
+ context from variable pointed to by UCP. */
+extern int swapcontext (ucontext_t *__restrict __oucp,
+ const ucontext_t *__restrict __ucp) __THROW;
+
+/* Manipulate user context UCP to continue with calling functions FUNC
+ and the ARGC-1 parameters following ARGC when the context is used
+ the next time in `setcontext' or `swapcontext'.
+
+ We cannot say anything about the parameters FUNC takes; `void'
+ is as good as any other choice. */
+extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
+ int __argc, ...) __THROW;
+
+__END_DECLS
+#endif
#endif /* ucontext.h */
--
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