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UNIX for Dummies Questions & Answers
Access problem.
Post 302272696 by leepan2008 on Wednesday 31st of December 2008 11:40:52 AM
12-31-2008
Access problem.
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LEARN ABOUT MOJAVE
mmap2
MMAP2(2) Linux Programmer's Manual MMAP2(2) NAME
mmap2 - map files or devices into memory SYNOPSIS
#include <sys/mman.h> void *mmap2(void *addr, size_t length, int prot, int flags, int fd, off_t pgoffset); DESCRIPTION
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). 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.) offset * 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
On architectures where this system call is present, the glibc mmap() wrapper function invokes this system call rather than the mmap(2) sys- tem 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. SEE ALSO
getpagesize(2), mmap(2), mremap(2), msync(2), shm_open(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2017-09-15 MMAP2(2)