Manpage of MMAP2
MMAP2Section: Linux Programmer's Manual (2)
NAMEmmap2 - map files or devices into memory
#include <sys/mman.h>void *mmap2(void *addr, size_t length, int prot, int flags, int fd, off_t pgoffset);
DESCRIPTIONThis is probably not the system call that you are interested in; instead, see mmap(2), which describes the glibc wrapper function that invokes this system call.
The mmap2() system call provides the same interface 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_tto map large files (up to 2^44 bytes).
RETURN VALUEOn success, mmap2() returns a pointer to the mapped area. On error, -1 is returned and errnois set appropriately.
- Problem with getting the data from user space.
- (Various platforms where the page size is not 4096 bytes.) offset * 4096is not a multiple of the system page size.
mmap2() can also return any of the errors described in mmap(2).
VERSIONSmmap2() is available since Linux 2.3.31.
CONFORMING TOThis system call is Linux-specific.
NOTESOn architectures where this system call is present, the glibc mmap() wrapper function invokes this system call rather than the mmap(2) system call.
This system call does not exist on x86-64.
SEE ALSOgetpagesize(2), mmap(2), mremap(2), msync(2), shm_open(3)
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