Name
mmap2 — map files or devices into memory
Synopsis
#include <sys/mman.h>
void
*mmap2( |
void * |
start, |
|
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 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, 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).
mmap2
() is available since
Linux 2.3.31. It is Linux specific, and should be avoided in
portable applications. On 32-bit systems, mmap2
() is used to implement the
mmap64
() function that is part
of the LFS (Large File Summit).
SEE ALSO
getpagesize(2), mmap(2), mremap(2), msync(2), shm_open(3)
Copyright (C) 2002, Michael Kerrisk
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entire resulting derived work is distributed under the terms of a
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Since the Linux kernel and libraries are constantly changing, this
manual page may be incorrect or out-of-date. The author(s) assume no
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Formatted or processed versions of this manual, if unaccompanied by
the source, must acknowledge the copyright and authors of this work.
Modified 31 Jan 2002, Michael Kerrisk <mtk-manpages@gmx.net>
Added description of mmap2
Modified, 2004-11-25, mtk -- removed stray #endif in prototype
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