Re: negative timeout can be set up by setsockopt system call

[linux-os (Dick Johnson)]

On Fri, 4 Nov 2005, Ram Gupta wrote:

> I observed that the the setsockopt system call can  setup negative
> timeout. As a matter of fact the function sock_set_timeout checks for
> zero timeout but does not check for negative timeouts. I tested this
> against 2.6.14  kernel but it is so in all previous release also. So I
> am wondering if it is a bug or there is some reason for keeping it that
> way which I am missing.
>
> Regards
> Ram gupta

As a parameter it takes a void pointer to the value plus a
length of the object to which the value points. Given this,
I don't understand "negative". The pointer can point to
anything of a specified size so it doesn't have a sense
of +/-.

If the socket call itself checked for sign it would
severly limit what options could be adjusted. Perhaps
the SO_SNDTIMEO/SO_RCVTIMEO might do some checking, but
I think it's valid to set the timeout to -1, meaning it
never times-out.


Cheers,
Dick Johnson
Penguin : Linux version 2.6.13.4 on an i686 machine (5589.55 BogoMips).
Warning : 98.36% of all statistics are fiction.
.

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