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Sun Studio 12: Fortran Library Reference

1.4.14.1 fseeko64: Reposition a File on a Logical Unit

The function is called by:

INTEGER fseeko64

n = fseeko64( lunit, offset64, from )

lunit

INTEGER*4

Input 

Open logical unit 

offset64

INTEGER*8

Input 

64-bit offset in bytes relative to position specified by from

from

INTEGER*4

Input 

0=Beginning of file 

1=Current position 

2=End of file 

Return value 

INTEGER*4

Output 

n=0: OK; n>0: System error code

Note –

On sequential files, following a call to fseeko64 by an output operation (for example, WRITE) causes all data records following the fseek 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.

Example: fseeko64()—Reposition MyFile to two bytes from the beginning:


       INTEGER fseeko64, lunit/1/, from/0/, n
       INTEGER*8 offset/200/
       open( UNIT=lunit, FILE=’MyFile’ )
       n = fseeko64( lunit, offset, from )
       if ( n .gt. 0 ) stop ’fseek error’
       end