mmap2(2) -- Linux man page
NAMEmmap2 - map files or devices into memory
_syscall6(void *, start, size_t, length, int, prot, int, flags, int, fd, off_t, pgoffset);
void * mmap2(void *start, size_t length, int prot, int flags, int fd, off_t pgoffset);
DESCRIPTIONThe function mmap2 operates in exactly the same way as mmap(2), except that the final argument specifies the offset into the file in units of the system page size (instead of bytes). This enables applications that use a 32-bit off_t to map larger files (typically up to 2^44 bytes).
RETURN VALUEOn success, mmap2 returns a pointer to the mapped area. On error -1 is returned and errno is set appropriately.
NOTESThe function mmap2 is available since Linux 2.3.31. It is Linux specific, and should be avoided in portable applications. See also the mmap64() function that is part of the LFS (Large File Summit).
SEE ALSOgetpagesize(2), mmap(2), mremap(2), msync(2), shm_open(2)