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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | VERSIONS | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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mmap2(2) System Calls Manual mmap2(2)
mmap2 - map files or devices into memory
Standard C library (libc, -lc)
#include <sys/mman.h> /* Definition of MAP_* and PROT_* constants */
#include <sys/syscall.h> /* Definition of SYS_* constants */
#include <unistd.h>
void *syscall(SYS_mmap2, unsigned long addr, unsigned long length,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoffset);
This 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_t to map large
files (up to 2^44 bytes).
On success, mmap2() returns a pointer to the mapped area. On
error, -1 is returned and errno is set to indicate the error.
EFAULT Problem with getting the data from user space.
EINVAL (Various platforms where the page size is not 4096 bytes.)
offset * 4096 is not a multiple of the system page size.
mmap2() can also return any of the errors described in mmap(2).
On 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.
On ia64, the unit for offset is actually the system page size,
rather than 4096 bytes.
Linux.
Linux 2.3.31.
getpagesize(2), mmap(2), mremap(2), msync(2), shm_open(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.9.1.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 mmap2(2)
Pages that refer to this page: mmap(2), remap_file_pages(2), syscalls(2)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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