glibc/include/sys/mman.h

#ifndef _SYS_MMAN_H
#include <misc/sys/mman.h>

/* Now define the internal interfaces.  */
extern void *__mmap (void *__addr, size_t __len, int __prot,
		     int __flags, int __fd, __off_t __offset);
extern void *__mmap64 (void *__addr, size_t __len, int __prot,
		       int __flags, int __fd, __off64_t __offset);
extern int __munmap (void *__addr, size_t __len);
extern int __mprotect (void *__addr, size_t __len, int __prot);

/* This one is Linux specific.  */
extern void *__mremap (void *__addr, size_t __old_len,
		       size_t __new_len, int __flags, ...);

libc_hidden_proto (madvise);

#endif