mmap64(3)

1MMAP2(2)                   Linux Programmer's Manual                  MMAP2(2)
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NAME

6       mmap2 - map files or devices into memory
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SYNOPSIS

9       #include <sys/mman.h>
10       #include <syscall.h>
11       #include <errno.h>
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13       _syscall6(void *, mmap2, void *, start, size_t, length,
14                 int, prot, int, flags, int, fd, off_t, pgoffset)
15                 /* Using syscall(2) may be preferable; see intro(2) */
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17       void * mmap2(void *start, size_t length, int prot,
18                    int flags, int fd, off_t pgoffset);
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DESCRIPTION

21       The  mmap2()  system  call operates in exactly the same way as mmap(2),
22       except that the final argument specifies the offset into  the  file  in
23       4kB  units  (instead  of  bytes).  This enables applications that use a
24       32-bit off_t to map larger files (typically up to 2^44 bytes).
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RETURN VALUE

27       On success, mmap2() returns a pointer to the mapped area. On  error  -1
28       is returned and errno is set appropriately.
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ERRORS

31       EFAULT
32              Problem with getting the data from userspace.
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NOTES

35       mmap2()  is  available  since  Linux 2.3.31.  It is Linux specific, and
36       should be avoided in portable applications.  On 32-bit systems, mmap2()
37       is  used  to  implement  the  mmap64() function that is part of the LFS
38       (Large File Summit).
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CONFORMING TO

41       This system call is Linux specific.
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