From: Kem Mason <bulbous@...>
Date: 2008-11-14T06:36:18+09:00
Subject: Re: How to set socket option SO_RCVTIMEO


I tried something like that, and it never timed out -- so after your 
post, I tried the following (the server I'm connecting to reads a CRLF 
terminated string, and returns a response after X seconds (150 in this 
case))

sock = TCPSocket.new('foodlinux', 3232)
=> #<TCPSocket:0x2be080>
opt = [1, 1].pack("I_2")
=> "\001\000\000\000\001\000\000\000"
sock.setsockopt(Socket::SOL_SOCKET, Socket::SO_RCVTIMEO, opt)
=> 0
sock.write("150\r\n")
=> 5
puts "read: #{sock.gets}"
....

it never times out -- seems like it should return after 1.000001 seconds 
regardless of the byte ordering.

What am I missing here?





Brian Candler wrote:
> Zakaria wrote:
>> How to set socket option SO_RCVTIMEO in Windows XP?
>> The C version use somekind struct.
> 
> First, read the option:
> 
> irb(main):001:0> require 'socket'
> => true
> irb(main):002:0> s = TCPServer.new(1234)
> => #<TCPServer:0xb7d246d4>
> irb(main):003:0> s.getsockopt(Socket::SOL_SOCKET, Socket::SO_RCVTIMEO)
> => "\000\000\000\000\000\000\000\000"
> 
> So if it's a struct timeval, that's a 32-bit tv_sec followed by a 32-bit 
> tv_usec. Not clear about the byte order, though, since it's all zero 
> here.
> 
> So let's try native byte ordering, to set a timeout of 1.5 seconds (1 
> second + 500,000 microseconds):
> 
> irb(main):008:0> n = [1, 500_000].pack("I_2")
> => "\001\000\000\000 \241\a\000"
> irb(main):009:0> s.setsockopt(Socket::SOL_SOCKET, Socket::SO_RCVTIMEO, n 
> )
> => 0
> irb(main):010:0> s.accept
> Errno::EAGAIN: Resource temporarily unavailable
>   from (irb):10:in `accept'
>   from (irb):10
>   from :0
> 
> Yep, there was a pause of 1.5 seconds before the exception was raised.
> 
> Look OK?

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