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Re: remote syslog support in Redboot?


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Jon Ringle wrote:
> On Thursday, May 10, 2007 7:56 AM, Andrew Lunn wrote:
>> On Wed, May 09, 2007 at 03:12:29PM -0400, Jon Ringle wrote:
>>> Has anyone implemented the ability to have diag_printf() messages be
>>> sent to a remote syslog server in Redboot/ecos?
>> You will have to be careful when doing this. diag_printf() uses a very
>> simple polled IO, blocking serial device driver. The idea is that it
>> should always work, in any context. So you can do a diag_printf() in
>> an ISR or a DSR, not just a thread. It is also guaranteed the output
>> will be out the serial port before diag_printf() returns.
> 
> How is this guaranteed if I connect to Redboot on tcp port 9000?

RedBoot uses a polled TCP connection, thus when you make a
call to diag_printf() that channels through RedBoot, it _will_
complete at the receiver before continuing.  Interrupts are
off during this time, so it's safe even in ISR/DSR context.

Note: there can be issues if you try to send such messages from
within the network stack/drivers and these are routed
directly to the serial console, not over the network.

- --
- ------------------------------------------------------------
Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
- ------------------------------------------------------------
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