Re: popen

[Chris Hamilton <chamilto@navtechinc.com>]

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The problem seems to come when I include the odbc libraries included 
with redhat 7.3.  I've included a test .c file that will cause the 
problem when run with:
cc popen_test.c -o a.out -g -lodbc


Bruce Korb wrote:

>Daniel Jacobowitz wrote:
>  
>
>>On Mon, Jan 20, 2003 at 01:30:04PM -0800, Bruce Korb wrote:
>>    
>>
>>>Chris Hamilton wrote:
>>>      
>>>
>>>>Bruce,
>>>>I came across your September 24th posting about gdb throwing off a
>>>>"Cannot find thread 2049" when it hits a popen
>>>>(http://sources.redhat.com/ml/insight/2002-q3/msg00185.html).
>>>>I'm currently experiencing the same problem in my application, and I was
>>>>wondering if you had any advice on how to solve it.
>>>>        
>>>>
>
>  
>
>>Popen should not present this problem.  I don't know why it does, so we
>>need more information.
>>    
>>
>
>It seems to occur when using popen, but not when I do all
>the fork/exec stuff myself.  I'll see if a trivial popen
>example duplicates the problem, but I would guess that many
>would have complained by now if it were that easy.
>
>  
>
>>Meanwhile multi-process debugging is forthcoming.  The Linux kernel
>>patches are already in and I have more GDB patches queued.
>>    
>>
>
>Excellent!!  Thank you very much!
>
>  
>

[-- Attachment #2: popen_test.c --]
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#include <stdio.h>

int main()
{

FILE *tpPipeFp;

if((tpPipeFp = popen("test", "w")) == NULL)
    {
    printf("Can't open pipe\n");
    exit();
    }
else
    printf("I've opened the pipe\n");

pclose(tpPipeFp);

}