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MMAP2(2) Linux Programmer's Manual MMAP2(2)
NAME
mmap2 - map files or devices into memory
SYNOPSIS
#include <sys/mman.h>
#include <syscall.h>
#include <errno.h>
_syscall6(void *, mmap2, void *, start, size_t, length,
int, prot, int, flags, int, fd, off_t, pgoffset)
/* Using syscall(2) may be preferable; see intro(2) */
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 appli-
cations 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.
NOTES
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)
Linux 2.3.31 2002-01-31 MMAP2(2)
Man(1) output converted with
man2html and wrapped by fishsponge
This page was generated on Tue Feb 13 02:17:37 GMT 2007
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