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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

       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).

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.

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

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

VERSIONS

       mmap2() is available since Linux 2.3.31.

CONFORMING TO

       This system call is Linux-specific.

NOTES

       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.

SEE ALSO

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

COLOPHON

       This  page  is  part of release 3.35 of the Linux man-pages project.  A description of the
       project, and information about reporting bugs, can be found at  http://man7.org/linux/man-
       pages/.