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.
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Modified 31 Jan 2002, Michael Kerrisk <mtk.manpages@gmail.com>
Added description of mmap2
Modified, 2004-11-25, mtk -- removed stray #endif in prototype