Re: Bizarre x86 segment layout problem causing select() slowdown: solved, sort of
Re: Bizarre x86 segment layout problem causing select() slowdown: solved, sort of
- Subject: Re: Bizarre x86 segment layout problem causing select() slowdown: solved, sort of
- From: glenn andreas <email@hidden>
- Date: Wed, 7 Feb 2007 12:56:40 -0600
On Feb 7, 2007, at 12:49 PM, Jonas Maebe wrote:
setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (void*)32768, sizeof(int));
Shouldn't you pass the address of a variable containing the buffer
size rather than the actual value? Have you tried checking the
return value of that call?
It's still a bug of course if behaviour randomly changes depending
on which erroneous parameter you pass (maybe the kernel doesn't
deal gracefully with a wrong parameter there and uses an
uninitialised value in case it's invalid).
32768 ends up being smack in the middle of the __TEXT segment, so
whatever is at that address is part of the program. Thus adding
dummy routines will change what part of the program that points to,
and thus alter the behavior.
Glenn Andreas email@hidden
<http://www.gandreas.com/> wicked fun!
quadrium2 | build, mutate, evolve, animate | images, textures,
fractals, art
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