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).

RETURN VALUE
       On success, mmap2 returns a pointer to the mapped area. On error -1 is
       returned and errno is set appropriately.

ERRORS
       EFAULT Problem with getting the data from userspace.

NOTES
       The function mmap2 is available since Linux 2.3.31.  It is Linux	 spe-
       cific,  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)