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Re: [Qemu-devel] Missing system calls retries in case of EINTR

From: Rob Landley
Subject: Re: [Qemu-devel] Missing system calls retries in case of EINTR
Date: Fri, 6 Jul 2007 14:57:07 -0400
User-agent: KMail/1.9.6

On Monday 25 June 2007 20:14:24 Yigael Fleishman wrote:
> Running qemu on a Ubuntu Feisty host I've encountered an occasional
> failure-to-launch problem.
> I've used the "-serial /dev/ttyS0" at the command line, and qemu would
> often exit printing "could not open serial device".
> Looking in the srcs I've noticed that  qemu_chr_open_tty does not retry the
> 'open' syscall if it fails and errno=EINTR.
> I've added a retry for such case and it seems to solve that specific
> problem (see the following patch).
> Furthermore, I've noticed that all open, read and some write calls in
> vl.care not retried in such cases.

Please don't play whack-a-mole with this.  You probably want 
sigaction(SA_RESTART) when running system emulation.

"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.

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