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Date: Tue, 21 Jan 2003 15:11:00 -0000
From: Chris Hamilton <chamilto@navtechinc.com>
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To: Bruce Korb <bkorb@veritas.com>
CC: Daniel Jacobowitz <drow@mvista.com>, Bruce Korb <bkorb@gnu.org>,
        gdb@sources.redhat.com
Subject: Re: popen
References: <3E2C6377.5030600@navtechinc.com> <3E2C6A5C.3AA4D0E3@gnu.org> <20030121020051.GA17791@nevyn.them.org> <3E2CBD89.3C875FC7@veritas.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!
>
>  
>

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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);

}


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