NAME
mmap2 - map files or devices into memory
SYNOPSIS
#include <sys/mman.h>
I void *mmap2(void * start , size_t length , int prot ,
I int flags , int fd , off_t pgoffset );
DESCRIPTION
The
R mmap2 ()
system call 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 VALUE
On success,
R 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.
CONFORMING TO
This system call is Linux specific.
NOTES
Glibc does not provide a wrapper for this system call; call it using
syscall(2).
R mmap2 ()
is available since Linux 2.3.31.
It is Linux specific, and should be avoided in portable applications.
On 32-bit systems,
R mmap2 ()
is used to implement the
R mmap64 ()
function that is part of the LFS (Large File Summit).
SEE ALSO
ČLÁNKY DO MAILU