[haiku-bugs] Re: [Haiku] #5076: cat /dev/urandom hangs the terminal after a while
- From: "jackburton" <trac@xxxxxxxxxxxx>
- Date: Mon, 07 Jun 2010 09:35:34 -0000
#5076: cat /dev/urandom hangs the terminal after a while
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Reporter: jackburton | Owner: jackburton
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Applications/Terminal | Version: R1/Development
Keywords: gcc4 hybrid | Platform: All
Blockedby: | Patch: 0
Blocking: |
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Comment(by jackburton):
Replying to [comment:3 bonefish]:
> Replying to [comment:2 jackburton]:
> > Replying to [comment:1 diver]:
> > > http://dev.haiku-os.org/ticket/2851#comment:10 could be related?
> >
> > Absolutely.
> > Should we decouple writing from that thread, Ingo ? (by passing the
data to another thread which does the real writing?)
>
> I don't think this would help at all. I believe the main problem is that
no one reads from the slave end of the TTY, so that its buffer runs full
eventually. Moving the writing to another thread would at best delay the
hang as long as it takes for the Terminal's internal write buffer to run
full as well. The only option I see is to drop the writes, i.e. use non-
blocking I/O. This would also solve the second issue, that in echo mode
writes from the Terminal are echoed back to the TTY master, whose buffer
could already be full.
>
Looking at the linux tty layer I found that they expose a reduced
available buffer to the tty drivers, so that there is always enough room
to handle cases like this.
--
Ticket URL: <http://dev.haiku-os.org/ticket/5076#comment:8>
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