NAME
mmap2 - map files or devices into memory SYNOPSIS
#include
void *mmap2(void *addr, sizet length, int prot, int flags, int fd, offt pgoffset); DESCRIPTION This is probably not the system call you are interested; 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 applica‐
tions that use a 32-bit offt 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 user space. EINVAL (Various platforms where the page size is not 4096 bytes.) off‐ set * 4096 is not a multiple of the system page size. mmap2() can also return any of the errors described in 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. SEE ALSO getpagesize(2), mmap(2), mremap(2), msync(2), shmopen(3) COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2012-04-16 MMAP2(2)