glibc/include/stdio.h

#ifdef USE_IN_LIBIO
#ifdef __need_FILE
# include <libio/stdio.h>
#else
# include <libio/stdio.h>

/* Now define the internal interfaces.  */
extern int __fcloseall __P ((void));
extern int __snprintf __P ((char *__restrict __s, size_t __maxlen,
			    __const char *__restrict __format, ...))
     __attribute__ ((__format__ (__printf__, 3, 4)));
extern int __vfscanf __P ((FILE *__restrict __s,
			   __const char *__restrict __format,
			   _G_va_list __arg))
     __attribute__ ((__format__ (__scanf__, 2, 0)));
extern int __vscanf __P ((__const char *__restrict __format,
			  _G_va_list __arg))
     __attribute__ ((__format__ (__scanf__, 1, 0)));
extern _IO_ssize_t __getline __P ((char **__lineptr, size_t *__n,
				   FILE *__stream));

#endif
#else
#include <stdio/stdio.h>
#endif