Messages in this thread | | | Date | Tue, 1 Jul 2008 20:16:11 +0200 | From | "Michael Kerrisk" <> | Subject | Re: mmap'ed memory in core files ? |
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On 7/1/08, Philippe De Muyter <phdm@macqel.be> wrote: > Hello everybody, > > I develop video acquisition software using the video1394 interface. > The images grabbed by the camera and iee1394 bus are kept in kernel > memory and made available to the user program through a mmap call done > in the libdc1394 library : > > dma_ring_buffer= mmap(0, vmmap.nb_buffers * vmmap.buf_size, > PROT_READ|PROT_WRITE,MAP_SHARED, craw->capture.dma_fd, 0); > > Sometimes, my program crashes and produces a core file :) It seems to > me that the core file does not contain the mmap'ed memory and hence > I cannot replay my program with the same image for debugging purpose. > > Is it possible to configure the kernel through /proc, or through the mmap > system call to have that mmapped segment in the core file, or do I need > to modify the kernel itself to obtain the behaviour I want ? If I > need to modify the kernel, can some kind soul provide me some pointers ?
Have a look at the section "Controlling which mappings are written to the core dump" in a recent core.5 man page: http://www.kernel.org/doc/man-pages/online/pages/man5/core.5.html
Cheers,
Michael
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