5 element {struct ucontext_t} {ucontext_t*} uc_link
6 element {struct ucontext_t} sigset_t uc_sigmask
7 element {struct ucontext_t} stack_t uc_stack
8 element {struct ucontext_t} mcontext_t uc_mcontext
13 function int getcontext (ucontext_t*)
14 function int setcontext (const ucontext_t*)
15 function void makecontext (ucontext_t*, void(*)(void), int, ...)
16 function int swapcontext (ucontext_t*, const ucontext_t*)