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Full Discussion: Problems and doubts with sockets and timeouts
Special Forums IP Networking Problems and doubts with sockets and timeouts Post 302966190 by Kovalevski on Tuesday 9th of February 2016 08:14:36 AM
Old 02-09-2016
Problems and doubts with sockets and timeouts
Hi! I need some help to understand a little bit more the behaviour about socket and TCP connections...
Here is my problem I have a client and a server that were written in python. The server program wait
until a message arrive and then print the message but if the message not arrive in a second (a timeout of a second)
the connection is reset. In the other side the client sends a message in a random time and a "Still alive" message in about 0.4 seconds to the server.

For unexplained reasons randomly a timeout happen in the server Smilie although that I send the message just in time ,
I don't understand why this happen. I tried deactivate the Nagle's algorithm but the only change that I saw was the
time in appear another time out (in fact more larger) . I thought that if I can't avoid that problem about time outs
I must send the message again if the message was not received, but this produce me a few questions

Where are the messages that were lost in time out?
Can I have repeated messages after the time out? I mean If the timeout occurs, the message I sent can arrive later?
Why timeouts occur if I send correctly and timely message?

Thanks!
 

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LEARN ABOUT CENTOS

usb_control_msg

USB_CONTROL_MSG(9)						   USB Core APIs						USB_CONTROL_MSG(9)

NAME

       usb_control_msg - Builds a control urb, sends it off and waits for completion

SYNOPSIS

       int usb_control_msg(struct usb_device * dev, unsigned int pipe, __u8 request, __u8 requesttype, __u16 value, __u16 index, void * data,
			   __u16 size, int timeout);

ARGUMENTS

       dev
	   pointer to the usb device to send the message to

       pipe
	   endpoint "pipe" to send the message to

       request
	   USB message request value

       requesttype
	   USB message request type value

       value
	   USB message value

       index
	   USB message index value

       data
	   pointer to the data to send

       size
	   length in bytes of the data to send

       timeout
	   time in msecs to wait for the message to complete before timing out (if 0 the wait is forever)

CONTEXT

       !in_interrupt ()

DESCRIPTION

       This function sends a simple control message to a specified endpoint and waits for the message to complete, or timeout.

       Don't use this function from within an interrupt context, like a bottom half handler. If you need an asynchronous message, or need to send
       a message from within interrupt context, use usb_submit_urb. If a thread in your driver uses this call, make sure your disconnect method
       can wait for it to complete. Since you don't have a handle on the URB used, you can't cancel the request.

RETURN

       If successful, the number of bytes transferred. Otherwise, a negative error number.

COPYRIGHT

Kernel Hackers Manual 3.10					     June 2014							USB_CONTROL_MSG(9)
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