Re: index-pack died on pread

On Thu, 26 Jul 2007, Junio C Hamano wrote:

If you mean the offset associated with fd, we actually do.

Ahh, for some reason I thought we didn't (probably because the user likely 
doesn't care at all), but right you are..

The original HP-UX error is confusing, as we ask pread() to
transfer 428 bytes and it returns 0 (not returning -1 with
EINTR).  Return value of zero is understandable, if the starting
position is at or after the EOF, but the offset is 123601 and
56k objects packed from git.git repository should be longer than
that, so that also sounds implausible.

Yeah. It is suspicious.

If somebody could run git under gdb on HP-UX (preferably compiled 
statically), and just disassemble the pread() thing, it would be 
interesting.

PA-RISC assembly is *almost* entirely unreadable, but it might show 
whether hpux-11.11 actually has a pread() system call or whether it is 
doing the "emulate with lseek" and maybe obviously buggily at that..

It really isn't that complex a system call. So I'm surprised at bugs 
there, and that makes me worry that there is something in git that 
triggers this.

		Linus