From a8dc90eaaa5e6474beac828558d969b1aafee4af Mon Sep 17 00:00:00 2001 From: Florian Fainelli 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 Signed-off-by: Florian Fainelli Signed-off-by: Bernhard Reutner-Fischer Signed-off-by: Natanael Copa Signed-off-by: Bernhard Reutner-Fischer --- 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 . */ +/* The System V ABI user-level context switching support functions + are marked obsolescent by SuSv3. */ + #ifndef _UCONTEXT_H #define _UCONTEXT_H 1 #include +#ifdef __UCLIBC_HAS_CONTEXT_FUNCS__ + /* Get machine dependent definition of data structures. */ #include -/* 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 */ -- cgit v1.2.3