1 .\" Hey Emacs! This file is -*- nroff -*- source.
3 .\" Copyright (C) 2002, Michael Kerrisk
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25 .\" Modified 31 Jan 2002, Michael Kerrisk <mtk.manpages@gmail.com>
26 .\" Added description of mmap2
27 .\" Modified, 2004-11-25, mtk -- removed stray #endif in prototype
29 .TH MMAP2 2 2007-07-08 "Linux" "Linux Programmer's Manual"
31 mmap2 \- map files or devices into memory
34 .B #include <sys/mman.h>
36 .BI "void *mmap2(void *" start ", size_t " length ", int " prot ,
37 .BI " int " flags ", int " fd ", off_t " pgoffset );
42 system call operates in exactly the same way as
44 except that the final argument specifies the offset into the
45 file in 4096-byte units (instead of bytes, as is done by
47 This enables applications that use a 32-bit
49 to map large files (up to 2^44 bytes).
53 returns a pointer to the mapped area.
54 On error \-1 is returned and
60 Problem with getting the data from userspace.
63 (Various platforms where the page size is not 4096 bytes.)
65 is not a multiple of the system page size.
68 can return any of the same errors as
72 is available since Linux 2.3.31.
74 This system call is Linux-specific.
78 wrapper function invokes this system call rather than the
84 is actually the system page size, rather than 4096 bytes.
85 .\" ia64 can have page sizes ranging from 4kB to 64kB.
86 .\" On cris, it looks like the unit might also be the page size,
87 .\" which is 8192 bytes. -- mtk, June 2007