extern "C" {
#endif
+#include <features.h>
+
#include <signal.h>
-#ifdef _GNU_SOURCE
-#define ucontext __ucontext
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+#define NGREG (sizeof(gregset_t)/sizeof(greg_t))
#endif
struct __ucontext;
int getcontext(struct __ucontext *);
-void makecontext(struct __ucontext *, void (*)(void), int, ...);
+void makecontext(struct __ucontext *, void (*)(), int, ...);
int setcontext(const struct __ucontext *);
int swapcontext(struct __ucontext *, const struct __ucontext *);