RE: cannot lseek

Yes. I am running 32 bit ver. only. But I could able to copy >2GB files from
NFS mounted file systems to local file system. It is giving this error only
when I copy to NFS file system. 

Regards,
Prasad

-----Original Message-----
From: Kenneth Goodwin [mailto:[email protected]] 
Sent: Thursday, August 21, 2003 5:14 AM
To: [email protected]
Subject: RE: cannot lseek

Your answer is -
	you are running on a 32 bit version of the kernel
	File sizes are usually limited to 2GB unless you have
special
	64 bit file IO routines, arithmetic, and Inodes hacked into
the kernel.

	lseek(fildes, offset, whence);

	On a 32bit system, lseek  offsets are 32 bit signed long
integers
	1 bit to indicate numeric sign (+/-) and 31 bits carrying
the value.
	The sign bit (bit 31 base 0) is used for forward/backward
seek control
	especially in relative and end of file based seeks (whence
flag)

	2 raised to the power of 31 is 2,147,483,648  (2GB) which
is the
	maximum file size.

	You want bigger files, move to a full 64 bit kernel which
may or may not
	run on 32 bit hardware. Depends on whether they added in
the assembler code to
	handle 64 bit arithmetic on a 32 bit machine using 32 bit
integers.

	Hint -  unsigned long double_long_integer[2];  a[0] is
treated as a
	signed 32 bit integer, a[1] is treated as a unsigned 32 bit
integer
	and then you manage the carry forward's/backward's between
the
	two halves when doing math operations.



>
>
>  do you currently have any files on your system over 2GB?
My
>  mail files will not
>  cross 2GB.  Found out hard way.
>
>  Pamarthi Prasad wrote:
>  > Hi All,
>  >
>  > I am getting "cp: cannot lseek " error while copying a
>  file of size
>  > around 3 GB over NFS. It gives this error and stops
>  copying the file
>  > after copying     only 2 GB. Both NFS server and client
>  are running
>  > with*** NFS ver.3*.
>  >
>  >  Can somebody give me a hint...?
>  >
>  > TIA
>  >
>  > Regards,
>  >
>  > Prasad
>  >
>  >
>  >
>  >
>
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