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MMAP2(2)                   Linux Programmer's ManualMMAP2(2)NAME       mmap2 - map files or devices into memorySYNOPSIS       #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; in-       stead, seemmap(2), which describes the glibc wrapper function that in-       vokes this system call.       The  mmap2() system call provides the same interface asmmap(2), except       that the final argument specifies the offset into the file in 4096-byte       units (instead of bytes, as is done bymmap(2)).  This enables applica-       tions 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.)  off-              set * 4096 is not a multiple of the system page size.       mmap2() can also return any of the errors described inmmap(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 themmap(2) sys-       tem call.       This system call does not exist on x86-64.       On ia64, the unit for offset is actually the system page  size,  rather       than 4096 bytes.SEE ALSOgetpagesize(2),mmap(2),mremap(2),msync(2),shm_open(3)COLOPHON       This  page  is  part of release 5.05 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/.Linux                             2017-09-15MMAP2(2)