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Full Discussion: core dump
Top Forums UNIX for Dummies Questions & Answers core dump Post 20785 by Perderabo on Friday 3rd of May 2002 03:20:33 PM
Old 05-03-2002
Whoa! I think you may have your core files mixed up.

One type of corefiles is a file called "core" that appears in various directories around your system. When a process aborts as the result of a default action of certain uncaught signals, it tries to write a file called "core" in the current directory. This type of core file is just the stack and data segments of the process that aborted.

A second type of corefile occurs when the kernel detects a massive problem. The kernel will call an internal routine called "panic". panic will try to dump all of main memory to the swap area. Then is will halt or reboot depending on your config. When the box finally does boot, savecore will copy the corefile into the file system.

adb can be used on both types of corefiles. Type two is the type that needs a copy on vmunix. Type one on ethe other hand will need the executable that was running to cause the core file.
 

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GCORE(1)						      General Commands Manual							  GCORE(1)

NAME
gcore - get core image of running process SYNOPSIS
gcore [-s][-c core] pid DESCRIPTION
gcore creates a core image of each specified process, suitable for use with adb(1). By default the core image is written to the file <pid>.core. The options are: -c Write the core file to the specified file instead of <pid>.core. -s Stop the process while creating the core image and resume it when done. This makes sure that the core dump will be in a consistent state. The process is resumed even if it was already stopped. Of course, you can obtain the same result by manually stopping the process with kill(1). The core image name was changed from core.<pid> to <pid>.core to prevent matching names like core.h and core.c when using programs such as find(1). FILES
<process-id>.core The core image. BUGS
If gcore encounters an error while creating the core image and the -s option was used the process will remain stopped. Swapped out processes and system processes (the swapper) may not be gcore'd. 4.2 Berkeley Distribution April 15, 1994 GCORE(1)
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