Can you point me to code where kernel captures process in signal
handling and code which runs after suspend to ram is finished?
-----Original Message-----
From: Nigel Cunningham [mailto:[email protected]]
Sent: Wednesday, July 18, 2007 7:19 PM
To: Agarwal, Lomesh
Cc: [email protected]
Subject: Re: which signal is sent to freeze process?
Hi.
On Thursday 19 July 2007 09:42:02 Agarwal, Lomesh wrote:
> My understanding is that Linux kernel sends a signal to freeze
processes
> during suspend2ram operation. Which signal is used to achieve this?
> The problem I am facing is that some of the system calls are failing
> with EINTR errno during suspend operation and I want to install a
signal
> handler for freeze signal with SA_RESTART flag. That should make the
> kernel to retry the system calls. Right?
No signal is sent. We tell affected processes that they have a signal
pending,
and capture them in the signal handling code while the suspend to ram is
occuring. After the suspend to ram is finished, we recalculate whether
they
have a signal pending, and let them continue.
Not being a guru on signal handling itself, I won't try to answer the
question
itself :\.
Regards,
Nigel
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