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From venki <...@silistix.com>
Subject Re: org.apache.tools.ant.taskdefs.Execute and segafult
Date Thu, 13 Sep 2007 21:02:22 GMT

Thanks. I will write SIGSEGV handler in the C program and see how it works.


Bruce Atherton wrote:
> 
> It is entirely possible that the output never reaches Ant. The standard 
> C library is typically set up to buffer data on the standard file 
> handles, for efficiency purposes.
> 
> To get around this, you could:
> 
>   1) do a flush() on the stdout and stderr streams before the 
> segmentation fault (assuming you know where it is).
>   2) replace the standard file handles with ones that do not buffer 
> anything.
>   3) you might be able to write a signal handler for SIGSEGV to do the 
> flush(), I'm not sure.
> 
> If this is a C program that you can't alter the code for, then the only 
> place you might be able to find what was output is somewhere inside the 
> core dump, which isn't terribly practical.
> 
> As for detecting the segmentation fault, you could always look for the 
> core dump file, assuming the system generates one.
> 
> venki wrote:
>> Hi,
>> I am using org.apache.tools.ant.taskdefs.Execute combined with
>> org.apache.tools.ant.taskdefs.PumpStreamHandler to execute an external C
>> program. When the external C program segfaults, I am not able to to see
>> any
>> output that came from the external C program before it segfaults. Also, I
>> am
>> not able to see the 'segmentation fault' message in the stream output.
>> Any
>> help to solve this would be useful.
>>
>> Thanks.
>>
>> Venki
>>
>>   
> 
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