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    The following form allows you to view linux man pages.

    Command:

    remap_file_pages

    
    
    

    SYNOPSIS

           #define _GNU_SOURCE         /* See feature_test_macros(7) */
           #include <sys/mman.h>
    
           int remap_file_pages(void *addr, size_t size, int prot,
                                ssize_t pgoff, int flags);
    
    
    

    DESCRIPTION

           The  remap_file_pages()  system call is used to create a nonlinear map-
           ping, that is, a mapping in which the pages of the file are mapped into
           a   nonsequential   order   in   memory.    The   advantage   of  using
           remap_file_pages() over using repeated calls to  mmap(2)  is  that  the
           former  approach  does  not require the kernel to create additional VMA
           (Virtual Memory Area) data structures.
    
           To create a nonlinear mapping we perform the following steps:
    
           1. Use mmap(2) to create a mapping (which is initially  linear).   This
              mapping must be created with the MAP_SHARED flag.
    
           2. Use  one or more calls to remap_file_pages() to rearrange the corre-
              spondence between the pages of the mapping  and  the  pages  of  the
              file.   It  is possible to map the same page of a file into multiple
              locations within the mapped region.
    
           The pgoff and size arguments specify the region of the file that is  to
           be relocated within the mapping: pgoff is a file offset in units of the
           system page size; size is the length of the region in bytes.
    
           The addr argument serves two purposes.  First, it identifies  the  map-
           ping  whose  pages we want to rearrange.  Thus, addr must be an address
           that falls within a region previously mapped  by  a  call  to  mmap(2).
           Second,  addr  specifies the address at which the file pages identified
           by pgoff and size will be placed.
    
           The values specified in addr and size should be multiples of the system
           page size.  If they are not, then the kernel rounds both values down to
           the nearest multiple of the page size.
    
           The prot argument must be specified as 0.
    
           The flags argument has the same meaning as for mmap(2), but  all  flags
           other than MAP_NONBLOCK are ignored.
    
    
    

    RETURN VALUE

           On  success,  remap_file_pages()  returns 0.  On error, -1 is returned,
           and errno is set appropriately.
    
    
    

    ERRORS

           EINVAL addr does  not  refer  to  a  valid  mapping  created  with  the
                  MAP_SHARED flag.
    
    
    

    Linux 2008-04-22 REMAP_FILE_PAGES(2)

    
    
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