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ftello64 (3)
  • >> ftello64 (3) ( Solaris man: Библиотечные вызовы )
  • 
    NAME
         fseek, fseeko64, ftell, ftello64 - reposition a  file  on  a
         logical unit
    
    SYNOPSIS
         integer*4 function fseek (lunit, offset, from)
         integer*4 offset
            integer*8 offset in 64-bit environments
         integer*4 from
    
         integer*4 function fseeko64 (lunit, offset, from)
         integer*8 offset
         integer*4 from
    
         integer*4 function ftell (lunit)
            integer*8 function ftell (lunit) in 64-bit environments
    
         integer*8 function ftello64 (lunit)
    
    DESCRIPTION
         lunit must refer to an open  logical  unit.   offset  is  an
         offset  in bytes relative to the position specified by from.
         Valid values for from are:
              0 meaning 'beginning of the file'
              1 meaning 'the current position'
              2 meaning 'the end of the file'
    
         The value returned by fseek is 0  if  successful,  a  system
         error code otherwise.  See perror(3F).
    
         The function ftell returns the current position of the  file
         associated with the specified logical unit.  The value is an
         offset, in bytes, from the beginning of the  file.   If  the
         value returned is negative, it indicates an error and is the
         negation of the system error code.  See perror(3F).
    
         The offset returned by ftell can be used by fseek at a later
         time  in  the  program  to  reposition the file to that same
         place for reading.
    
         CAUTION: On sequential files, following a call to  fseek  by
         an  output  operation  (e.g.  WRITE) causes all data records
         following the new position to be deleted and replaced by the
         new  data  record  (and  an  end-of-file  mark). Rewriting a
         record in place can only be done with direct access files.
    
         fseeko64 and ftello64 operate identically to fseek and ftell
         respectively,  except  that  the  first  two  routines  will
         operate on "large files" as well -- files with size in bytes
         greater  than the range of INTEGER*4 data (2 Gb). Large file
         support  was  introduced  with  the  Solaris  2.6  operating
         environment.
         When used with a large  file,  the  variable  receiving  the
         result  from  ftello64  must  also  be declared INTEGER*8 to
         avoid truncation.
    
    NOTES
         When compiled to run in a 64-bit environment (with the  com-
         piler option -xarch=v9 or v9a) the offset variable passed to
         fseek must be declared INTEGER*8, and the ftell function and
         the  variables  receiving  the  result must also be declared
         INTEGER*8.
    
         The  64-bit versions, fseeko64 and ftello64, are provided to
         make  portability  between  32-bit  and  64-bit environments
         easier.
    
    FILES
         libF77.a
    
    SEE ALSO
         fseek(3S), perror(3F),
    
    
    
    


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