+extern void linux_ptrace_attach_warnings (pid_t pid, struct buffer *buffer);
+extern void linux_ptrace_init_warnings (void);
+extern void linux_enable_event_reporting (pid_t pid);
+extern int linux_supports_tracefork (void);
+extern int linux_supports_traceclone (void);
+extern int linux_supports_tracevforkdone (void);
+extern int linux_supports_tracesysgood (void);
+