[ новости /+++ | форум | теги | ]

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),

Партнёры:

Хостинг: