To begin using coreadm, you will first need to run it wit the “-g” option to specify where core files should be stored, and the pattern that should be used when creating the core file:
$ coreadm -g /var/core/core.%f.%p
Once a directory and file pattern are specified, you can optionally adjust which portions of the processes address space (e.g., text segment, heap, ISM, etc.) will be written to the core file. To ease debugging, I like to configure coreadm to dump everything with the”-G all” option:
$ coreadm -G all
Since core files are typically created at odd working hours, I also like to configure coreadm to log messages to syslog indicating that a core file was created. This can be done by using the coreadm “-e log” option:
$ coreadm -e log
After these settings are adjusted, the coreadm “-e global” option can be used to enable global core file generation, and the coreadm utility can be run without any arguments to view the settings (which are stored in /etc/coreadm.conf):
$ coreadm -e global
$ coreadm
global core file pattern: /var/core/core.%f.%p
global core file content: all
init core file pattern: core
init core file content: default
global core dumps: enabled
per-process core dumps: enabled
global setid core dumps: disabled
per-process setid core dumps: disabled
global core dump logging: enabled
Once global core file support is enabled, each time a process receives a deadly signal (e.g., SIGSEGV, SIGBUS, etc.):
$ kill -SIGSEGV 4652
A core file will be written to /var/core:
$ ls -al /var/core/*4652
-rw------- 1 root root 4163953 Mar 9 11:51 /var/core/core.inetd.4652
