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docs: admin-guide: Add description of %c corename format

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There is somehow no description of %c corename format specifier for
/proc/sys/kernel/core_pattern. The %c corename format specifier is
used by user-space application such as systemd-coredump, so it should
be documented.

To find where %c is handled in the kernel source code, look at
function format_corename() in fs/coredump.c.

Signed-off-by: HATAYAMA Daisuke <d.hatayama@fujitsu.com>
Link: https://lore.kernel.org/r/TYAPR01MB4014714BB2ACE425BB6EC6B7951A0@TYAPR01MB4014.jpnprd01.prod.outlook.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
d.hatayama@fujitsu.com 2020-02-13 02:51:49 +00:00 committed by Jonathan Corbet
parent 56e6b3b0b3
commit 895f2c20a8
1 changed files with 1 additions and 0 deletions
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Documentation/admin-guide/sysctl/kernel.rst
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@ -213,6 +213,7 @@ core_pattern is used to specify a core dumpfile pattern name.
%h hostname
%e executable filename (may be shortened)
%E executable path
%c maximum size of core file by resource limit RLIMIT_CORE
%<OTHER> both are dropped
* If the first character of the pattern is a '|', the kernel will treat