1 files changed, 43 insertions, 0 deletions
diff --git a/src/internal/libc.h b/src/internal/libc.h
new file mode 100644
index 00000000..e353f363
--- /dev/null
+++ b/src/internal/libc.h
@@ -0,0 +1,43 @@
+#ifndef LIBC_H
+#define LIBC_H
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#define libc __libc
+extern struct libc {
+	void (*lock)(volatile int *);
+	void (*cancelpt)(int);
+	int (*atexit)(void (*)(void));
+	void (*fini)(void);
+	void (*ldso_fini)(void);
+	int *(*errno_location)(void);
+	volatile int threads_minus_1;
+	int (*rsyscall)(int, long, long, long, long, long, long);
+	void (**tsd_keys)(void *);
+} libc;
+
+
+/* Designed to avoid any overhead in non-threaded processes */
+void __lock(volatile int *);
+#define LOCK(x) (libc.threads_minus_1 ? (__lock(x),1) : ((void)(x),1))
+#define UNLOCK(x) (*(x)=0)
+#define CANCELPT(x) (libc.cancelpt ? libc.cancelpt((x)),0 : (void)(x),0)
+#define CANCELPT_BEGIN CANCELPT(1)
+#define CANCELPT_END CANCELPT(0)
+
+extern char **__environ;
+#define environ __environ
+
+#undef weak_alias
+#define weak_alias(old, new) \
+	extern __typeof(old) new __attribute__((weak, alias(#old)))
+
+#undef LFS64_2
+//#define LFS64_2(x, y) weak_alias(x, y)
+#define LFS64_2(x, y) extern __typeof(x) y
+
+#undef LFS64
+#define LFS64(x) LFS64_2(x, x##64)
+
+#endif