Thanks, I will try setting errno, but I don't think it is signals.
I have been running truss on the process. The relevant part is
gettimeofday(0xbfbffa54,0x0) = 0 (0x0)
select(0x50,0x93f8c90,0x0,0x0,0xbfbffa74) = 3 (0x3)
read(0x16,0xa2da000,0x8000) ERR#60 'Operation timed out'
In fact there are no signals in the whole truss output
Graham.
On Thu, Jun 07, 2001 at 09:53:54AM -0700, Matt Dillon wrote:
> :A while ago our systems were upgraded from 4.2 to 4.3-RC, and at
> :this time we started seeing problems that I am having a difficult
> :time tracking down.
> :
> :We have a server process which is connected to by many other
> :machines, each of them streams data in via tcp/ip. These connections
> :are pretty much permanent.
> :
> :All had been running fine for a long time before the upgrade, but
> :now we have a problem with read(2) returning an error ETIMEDOUT,
> :which causes our code to close the connection.
> :
> :The strange thing is that things are fine for a few hours, then
> :all of a sudden we see each of the connections fail with this error.
> :Then after the clients have reconnected, all is fine for a few
> :hours and then they all do it again.
> :
> :The problem I am having in tracking this down is that man 2 read
> :does not specify ETIMEDOUT as an error that can be returned from
> :read(2) and man errno specifies that it would be returned from
> :connect(2) or send(2)
> :
> :So, here is my question. Does anyone know under what circumstance
> :ETIMEDOUT may be returned from read(2) or is this a potential bug
> :somewhere ?
> :
> :Thanks,
> :Graham.
>
> This seems very odd. I recommend setting errno to 0 prior to calling
> read() to make sure that it is actually read() that is setting the
> errno. You should also sift through your code and look closely at any
> signal handlers you might have - system calls made from inside a signal
> handler can rip errno right out from under the code the signal
> interrupted.
>
> -Matt
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