redhat man page for mmap2

MMAP2(2)						     Linux Programmer's Manual							  MMAP2(2)

NAME
       mmap2 - map files or devices into memory

SYNOPSIS
       #include <sys/mman.h>
       #include <syscall.h>

       _syscall6(void *, start, size_t, length, int, prot, int, flags, int, fd, off_t, pgoffset);

       void * mmap2(void *start, size_t length, int prot, int flags, int fd, off_t pgoffset);

       #endif

DESCRIPTION
       The  function mmap2 operates in exactly the same way as mmap(2), except that the final argument specifies the offset into the file in units
       of the system page size (instead of bytes).  This enables applications that use a 32-bit off_t to map larger files (typically  up  to  2^44
       bytes).

NOTES
       The  function  mmap2  is available since Linux 2.3.31.  It is Linux specific, and should be avoided in portable applications.  See also the
       mmap64() function that is part of the LFS (Large File Summit).

SEE ALSO
       getpagesize(2), mmap(2), mremap(2), msync(2), shm_open(2)

Linux 2.3.31							    2002-01-31								  MMAP2(2)