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2004 Feb 15 19:03

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Re: [vox-tech] core files
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Re: [vox-tech] core files

On 2004.02.15 17:57, Peter Jay Salzman wrote:
> On Sun 15 Feb 04,  5:53 PM, mrp <mrp@sonic.net> said:
> > On Sun, Feb 15, 2004 at 05:38:47PM -0800, Peter Jay Salzman wrote:
> > > I've noticed some core files have a number appended to them, like:
> > > 
> > >    core.2342
> > > 
> > > The number is most likely a pid, but I'm curious how the core file got
> > > named this way.  Is there a libc function that sets the name of a
> > > possible future core file?
> > 
> > I think it's probably a function of the default signal handler for 
> > the SIGABORT signal.
> i've used abort() tonight in one of my programs and it just gave a file
> named "core".
> > I don't know why it would use "core" sometimes and 
> > "core.<pid>" other times.. maybe if there is already a core file it uses
> > the second form instead to avoid overwriting an existing core file.
> can't be this.  i've had MANY core files written in my life.  ;-)  core
> files are just overwritten, not renamed (permission granting).
> i've noticed that whenever opera dumps core, the corefile always has the
> number in its name.  that's kind of why i figured it might be a libc
> thing that you can control.


This appears to be the default behavior for multithreaded programs

I also found a file /proc/sys/kernel/core_uses_pid that can make this the default for single-threaded programs by echo 1 > /proc/sys/kernel/core_uses_pid 

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