MMAP2(2)                  (2017-09-15)                   MMAP2(2)

     NAME
          mmap2 - map files or devices into memory

     SYNOPSIS
          #include <sys/mman.h>

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

     DESCRIPTION
          This is probably not the system call that you are interested
          in; instead, see mmap(2), which describes the glibc wrapper
          function that invokes this system call.

          The mmap2() system call provides the same interface 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).

     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 user space.

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

          mmap2() can also return any of the errors described in
          mmap(2).

     VERSIONS
          mmap2() is available since Linux 2.3.31.

     CONFORMING TO
          This system call is Linux-specific.

     NOTES
          On architectures where this system call is present, the
          glibc mmap() wrapper function invokes this system call
          rather than the mmap(2) system call.

          This system call does not exist on x86-64.

          On ia64, the unit for offset is actually the system page

     Page 1                        Linux             (printed 5/22/22)

     MMAP2(2)                  (2017-09-15)                   MMAP2(2)

          size, rather than 4096 bytes.

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

     COLOPHON
          This page is part of release 5.10 of the Linux man-pages
          project.  A description of the project, information about
          reporting bugs, and the latest version of this page, can be
          found at https://www.kernel.org/doc/man-pages/.

     Page 2                        Linux             (printed 5/22/22)