[PATCH] core.5: document the %f and %C core_pattern specifiers

[PATCH] core.5: document the %f and %C core_pattern specifiers

[Emanuele Rocca]

Whilst going through the relevant kernel code in fs/coredump.c, I noticed that
two core pattern specifiers supported by Linux are missing from man5/core.5.
Document them now.

Signed-off-by: Emanuele Rocca <emanuele.rocca@arm.com>
---
 man/man5/core.5 | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/man/man5/core.5 b/man/man5/core.5
index 8c26aa07e..4da5819b6 100644
--- a/man/man5/core.5
+++ b/man/man5/core.5
@@ -154,6 +154,11 @@ A single % character.
 %c
 Core file size soft resource limit of crashing process (since Linux 2.6.24).
 .TP
+%C
+CPU the task ran on
+.\" commit 8603b6f58637ce196d68f7749633ea81af196d66
+(since Linux 6.2).
+.TP
 %d
 .\" Added in git commit 12a2b4b2241e318b4f6df31228e4272d2c2968a1
 Dump mode\[em]same as value returned by
@@ -179,6 +184,11 @@ Pathname of executable,
 with slashes (\[aq]/\[aq]) replaced by exclamation marks (\[aq]!\[aq])
 (since Linux 3.0).
 .TP
+%f
+Actual filename of executable, which may differ from %e
+.\" commit f38c85f1ba6902e4e2e2bf1b84edf065a904cdeb
+(since Linux 5.9).
+.TP
 %F
 PIDFD of dumped process
 .\" commit b5325b2a270fcaf7b2a9a0f23d422ca8a5a8bdea
-- 
2.47.3

Re: [PATCH] core.5: document the %f and %C core_pattern specifiers

[Oleksandr Natalenko]

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On pátek 13. března 2026 20:15:54, středoevropský standardní čas Emanuele Rocca wrote:
> Whilst going through the relevant kernel code in fs/coredump.c, I noticed that
> two core pattern specifiers supported by Linux are missing from man5/core.5.
> Document them now.
> 
> Signed-off-by: Emanuele Rocca <emanuele.rocca@arm.com>
> ---
>  man/man5/core.5 | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/man/man5/core.5 b/man/man5/core.5
> index 8c26aa07e..4da5819b6 100644
> --- a/man/man5/core.5
> +++ b/man/man5/core.5
> @@ -154,6 +154,11 @@ A single % character.
>  %c
>  Core file size soft resource limit of crashing process (since Linux 2.6.24).
>  .TP
> +%C
> +CPU the task ran on
> +.\" commit 8603b6f58637ce196d68f7749633ea81af196d66
> +(since Linux 6.2).
> +.TP

For this part:

Acked-by: Oleksandr Natalenko <oleksandr@natalenko.name>

Thank you.

>  %d
>  .\" Added in git commit 12a2b4b2241e318b4f6df31228e4272d2c2968a1
>  Dump mode\[em]same as value returned by
> @@ -179,6 +184,11 @@ Pathname of executable,
>  with slashes (\[aq]/\[aq]) replaced by exclamation marks (\[aq]!\[aq])
>  (since Linux 3.0).
>  .TP
> +%f
> +Actual filename of executable, which may differ from %e
> +.\" commit f38c85f1ba6902e4e2e2bf1b84edf065a904cdeb
> +(since Linux 5.9).
> +.TP
>  %F
>  PIDFD of dumped process
>  .\" commit b5325b2a270fcaf7b2a9a0f23d422ca8a5a8bdea
> 


-- 
Oleksandr Natalenko, MSE

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Re: [PATCH] core.5: document the %f and %C core_pattern specifiers

[lepton]

On Fri, Mar 13, 2026 at 1:29 PM Oleksandr Natalenko
<oleksandr@natalenko.name> wrote:
>
> On pátek 13. března 2026 20:15:54, středoevropský standardní čas Emanuele Rocca wrote:
> > Whilst going through the relevant kernel code in fs/coredump.c, I noticed that
> > two core pattern specifiers supported by Linux are missing from man5/core.5.
> > Document them now.
> >
> > Signed-off-by: Emanuele Rocca <emanuele.rocca@arm.com>
> > ---
> >  man/man5/core.5 | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> > diff --git a/man/man5/core.5 b/man/man5/core.5
> > index 8c26aa07e..4da5819b6 100644
> > --- a/man/man5/core.5
> > +++ b/man/man5/core.5
> > @@ -154,6 +154,11 @@ A single % character.
> >  %c
> >  Core file size soft resource limit of crashing process (since Linux 2.6.24).
> >  .TP
> > +%C
> > +CPU the task ran on
> > +.\" commit 8603b6f58637ce196d68f7749633ea81af196d66
> > +(since Linux 6.2).
> > +.TP
>
> For this part:
>
> Acked-by: Oleksandr Natalenko <oleksandr@natalenko.name>
>
> Thank you.
>
> >  %d
> >  .\" Added in git commit 12a2b4b2241e318b4f6df31228e4272d2c2968a1
> >  Dump mode\[em]same as value returned by
> > @@ -179,6 +184,11 @@ Pathname of executable,
> >  with slashes (\[aq]/\[aq]) replaced by exclamation marks (\[aq]!\[aq])
> >  (since Linux 3.0).
> >  .TP
> > +%f
> > +Actual filename of executable, which may differ from %e
> > +.\" commit f38c85f1ba6902e4e2e2bf1b84edf065a904cdeb
> > +(since Linux 5.9).
> > +.TP
For this part:

Acked-by: Lepton Wu <ytht.net@gmail.com>

Thanks!
> >  %F
> >  PIDFD of dumped process
> >  .\" commit b5325b2a270fcaf7b2a9a0f23d422ca8a5a8bdea
> >
>
>
> --
> Oleksandr Natalenko, MSE

Re: [PATCH] core.5: document the %f and %C core_pattern specifiers

[Alejandro Colomar]

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Hi all,

On 2026-03-13T13:51:56-0700, lepton wrote:
> On Fri, Mar 13, 2026 at 1:29 PM Oleksandr Natalenko
> <oleksandr@natalenko.name> wrote:
> >
> > On pátek 13. března 2026 20:15:54, středoevropský standardní čas Emanuele Rocca wrote:
> > > Whilst going through the relevant kernel code in fs/coredump.c, I noticed that
> > > two core pattern specifiers supported by Linux are missing from man5/core.5.
> > > Document them now.
> > >
> > > Signed-off-by: Emanuele Rocca <emanuele.rocca@arm.com>

Thanks!  I've applied the patch,

> > > ---
[...]
> > > +%C
> > > +CPU the task ran on
> > > +.\" commit 8603b6f58637ce196d68f7749633ea81af196d66
> > > +(since Linux 6.2).
> > > +.TP
> >
> > For this part:
> >
> > Acked-by: Oleksandr Natalenko <oleksandr@natalenko.name>
> >
> > Thank you.
> >
[...]
> > > +%f
> > > +Actual filename of executable, which may differ from %e
> > > +.\" commit f38c85f1ba6902e4e2e2bf1b84edf065a904cdeb
> > > +(since Linux 5.9).
> > > +.TP
> For this part:
> 
> Acked-by: Lepton Wu <ytht.net@gmail.com>

And both ACKs.


Have a lovely night!
Alex

> 
> Thanks!
> > >  %F
> > >  PIDFD of dumped process
> > >  .\" commit b5325b2a270fcaf7b2a9a0f23d422ca8a5a8bdea
> > >
> >
> >
> > --
> > Oleksandr Natalenko, MSE

-- 
<https://www.alejandro-colomar.es>

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