Re: [Qemu-devel] Missing system calls retries in case of EINTR
Rob Thanks for the background info. I wasn't very specific in my last question. Actually I meant to ask why doesn't qemu code set sigaction(SA_RESTART) for _all_ signals when running in system emulation mode (or maybe it does, which means there's even larger problem...) --Yigael On 7/11/07, Rob Landley [EMAIL PROTECTED] wrote: Talking about sigaction(SA_RESTART) vs looping around -EINTR everywhere: On Tuesday 10 July 2007 8:57:34 pm Yigael Fleishman wrote: Rob, Thanks, that should also work. Seems do_sigaction() in linux-user/signal.c has some code which does that (though obviously not for the signal that I'm receiving). Any idea why SA_RESTART calls are not invoked by default to restart syscalls for all signals? Fallout from old 1980's-era Unixes that didn't implement SA_RESTART, basically. Standards like SUSv3 say to humor them, because they paid for the standard... http://www.ussg.iu.edu/hypermail/linux/kernel/0507.1/1065.html --Yigael Rob -- One of my most productive days was throwing away 1000 lines of code. - Ken Thompson.
Re: [Qemu-devel] Missing system calls retries in case of EINTR
Rob, Thanks, that should also work. Seems do_sigaction() in linux-user/signal.c has some code which does that (though obviously not for the signal that I'm receiving). Any idea why SA_RESTART calls are not invoked by default to restart syscalls for all signals? --Yigael On 7/6/07, Rob Landley [EMAIL PROTECTED] wrote: 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. Rob -- One of my most productive days was throwing away 1000 lines of code. - Ken Thompson.
[Qemu-devel] USB-Bluetooth dongle problem on linux guest
Hi All I've posted a message in the QEMU For linux forum regarding a USB-Bluetooth dongle problem I've been experiencing on a linux guest system. The response I received did not help much. I guess the developers mailing list might be a better place for this question. The message is located att: http://qemu-forum.ipi.fi/viewtopic.php?t=3150 I hope someone has an idea how can I resolve this problem. Thanks! --Yigael
