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

       mmap2 - map files or devices into memory

       #include <sys/mman.h>

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

       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
       4096-byte  units	 (instead  of  bytes,  as  is  done by mmap(2)).  This
       enables applications that use a 32-bit off_t to map large files (up  to
       2^44 bytes).

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

       EFAULT Problem with getting the data from userspace.

       EINVAL (Various platforms where the page size is not 4096 bytes.)  off‐
	      set * 4096 is not a multiple of the system page size.

       mmap2() can return any of the same errors as mmap(2).

       mmap2() is available since Linux 2.3.31.

       This system call is Linux-specific.

       Nowadays,  the  glibc  mmap() wrapper function invokes this system call
       rather than the mmap(2) system call.

       On ia64, the unit for offset is actually the system page	 size,	rather
       than 4096 bytes.

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

       This  page  is  part of release 3.22 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

Linux				  2008-04-22			      MMAP2(2)

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