NAME

       gfs_pio_set_view_index - change file view to an individual fragment

SYNOPSIS

       #include <gfarm/gfarm.h>

       char  *gfs_pio_set_view_index  (GFS_File gf, int fragment_number, int fragment_index, char
       *host, int flags);

DESCRIPTION

       gfs_pio_set_view_index() changes the process's view of the data in the file  specified  by
       gf to a file fragment with the index fragment_index.

       When  creating  a  new file, it is necessary to specify the total number of file fragments
       fragment_number.  Every parallel process should specify the same fragment_number  for  the
       corresponding  file.   When  the  file  exists,  GFARM_FILE_DONTCARE can be specified.  If
       fragment_number is different from the total fragment number of the existent  file,  it  is
       erroneous.

       host  is  used  for explicitly specifying a filesystem node.  If host is NULL, appropriate
       filesystem node is chosen.

       Values of flag are constructed by a bitwise-inclusive-OR of the following list.

       GFARM_FILE_SEQUENTIAL
              File will be accessed sequentially.

       GFARM_FILE_REPLICATE
              File may be replicated to a local filesystem when accessing  remotely.   This  flag
              cannot be specified with GFARM_FILE_NOT_REPLICATE.

       GFARM_FILE_NOT_REPLICATE
              File  may  not  be  replicated to a local filesystem when accessing remotely.  This
              flag cannot be specified with GFARM_FILE_REPLICATE.

       By default, Gfarm files are accessed as a whole  file  in  global  file  view  where  each
       fragment can be seamlessly accessed.

RETURN VALUES

       NULL   The function terminated successfully.

       GFARM_ERR_NO_MEMORY
              Insufficient memory was available.

       GFARM_ERR_OPERATION_NOT_PERMITTED
              The file is not a regular fragmented file.

       GFARM_ERR_FRAGMENT_NUMBER_DOES_NOT_MATCH
              The total number of file fragments is different from the existence one.

       GFARM_ERR_INVALID_ARGUMENT
              Invalid  arguments are specified, for instance, GFARM_FILE_DONTCARE is specified as
              the total number of fragments of a newly created file.

       Others An error except the above occurred.  The reason is shown by its pointed strings.

SEE ALSO

       gfs_pio_create(3), gfs_pio_open(3), gfs_pio_set_view_local(3)