mmap2(2)



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

NAME
       mmap2 - map files or devices into memory

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

       _syscall6(void *, mmap2, void *, start, size_t, length,
                 int, prot, int, flags, int, fd, off_t, pgoffset)
                 /* Using syscall(2) may be preferable; see intro(2) */

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

DESCRIPTION
       The  mmap2()  system  call 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 appli-
       cations 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
       mmap2() is available since Linux 2.3.31.  It  is  Linux  specific,  and
       should be avoided in portable applications.  On 32-bit systems, mmap2()
       is used to implement the mmap64() function that  is  part  of  the  LFS
       (Large File Summit).

CONFORMING TO
       This system call is Linux specific.

SEE ALSO
       getpagesize(2), mmap(2), mremap(2), msync(2), shm_open(3)

Linux 2.3.31                      2002-01-31                          MMAP2(2)

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