Re: OT: tell() function in Linux

[fred smith <fredex fcshome stoneham ma us>]

On Fri, Mar 03, 2000 at 05:17:58PM -0800, Brian Wright wrote:
> Hi, all..
> 
> Is there an equivalent to the tell() function from DOS/Windoze?  I'm in the
> process of porting a program over and it does file i/o with open, close, lseek.
>  These are using an int handle, and a file stream will not work for this
> application.  There doesn't appear to be a tell() function though.  The DOS
> function uses io.h, and it's called out as long tell(int handle).  Nothing
> seems to be in the GNU docs for glibc listing a similar function.

If you look carefully at the man page for lseek() you'll see:

RETURN VALUES
       Upon  successful  completion,  lseek returns the resulting
       offset location as measured in bytes from the beginning of
       the file.  Otherwise, a value of (off_t)-1 is returned and
       errno is set to indicate the error.

So, knowing this, if you write code similar to this, you'll have
what I think you're asking for:

	#include <sys/types.h>
	#include <unistd.h>
	long tell (int filedes)
		{
		return (long) lseek (filedes, 0L, SEEK_CUR);
		}

Tell() must be some MS-specific/non-standard extension?


Fred

> 
> Thanks,
> Brian
> _________________________________________________________________________
> Brian Wright                                   Aturna Communications Inc.
> bdw aturna com                                          Internet Services
>                                                 WWW http://www.aturna.net
> _________________________________________________________________________       
> 
> 
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-- 
---- Fred Smith -- fredex fcshome stoneham ma us ----------------------------
   "For the word of God is living and active. Sharper than any double-edged 
   sword, it penetrates even to dividing soul and spirit, joints and marrow; 
              it judges the thoughts and attitudes of the heart."  
---------------------------- Hebrews 4:12 (niv) ------------------------------