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mmap2 (2)
  • mmap2 (2) ( Русские man: Системные вызовы )
  • >> mmap2 (2) ( Linux man: Системные вызовы )
  •  

    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

    The mmap2() system call operates in exactly the same way 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 userspace.
    EINVAL
    (Various platforms where the page size is not 4096 bytes.) offset * 4096 is not a multiple of the system page size.

    mmap2() can return any of the same errors as 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), shm_open(3)  

    COLOPHON

    This page is part of release 3.14 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/.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    RETURN VALUE
    ERRORS
    VERSIONS
    CONFORMING TO
    NOTES
    SEE ALSO
    COLOPHON


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