core_pattern is used to specify a core dumpfile pattern name.
- max length 128 characters; default value is “core”
- core_pattern is used as a pattern template for the output filename; certain string patterns (beginning with ‘%’) are substituted with their actual values.
- backward compatibility with core_uses_pid: If core_pattern does not include “%p” (default does not) and core_uses_pid is set, then .PID will be appended to the filename.
- corename format specifiers:
%<NUL> '%' is dropped
%% output one '%'
%P global pid (init PID namespace)
%I global tid (init PID namespace)
%u uid (in initial user namespace)
%g gid (in initial user namespace)
%d dump mode, matches PR_SET_DUMPABLE and
%s signal number
%t UNIX time of dump
%e executable filename (may be shortened)
%E executable path
%<OTHER> both are dropped
- If the first character of the pattern is a ‘|’, the kernel will treat the rest of the pattern as a command to run. The core dump will be written to the standard input of that program instead of to a file.