Re: [PATCH 4/4] Document the new "-a" argument for gcore

[John Baldwin <jhb at freebsd dot org>]

On Tuesday, November 28, 2017 06:35:37 PM Eli Zaretskii wrote:
> > From: Sergio Lopez <slp@redhat.com>
> > Cc: Sergio Lopez <slp@redhat.com>
> > Date: Tue, 28 Nov 2017 14:21:48 +0100
> > 
> > +@item -a
> > +Instruct GDB to unconditionally dump all sections (except IO), ignoring the
>             ^^^
> "@value{GDBN}"
> 
> > +value of @file{/proc/@var{pid}/coredump_filter} and the VM_DONTDUMP flag.
> 
> Is this Linux-specific?  Because AFAIK 'gcore' isn't, and so we need
> to document that this switch and the details you've put into its
> description are specific to Linux.
> 
> Also, VM_DONTDUMP should be in @code.

It is OS-specific.  FreeBSD has a similar notion (it excludes memory regions
marked with a KVME_FLAG_NOCOREDUMP in fbsd_find_memory_regions in fbsd-nat.c
that are created by passing MAP_NOCORE to mmap()).  I could make FreeBSD's
native target honor the same flag name once this is pushed in, though
FreeBSD's kernel always honors the NOCOREDUMP flag (there is no way to force
a kernel-generated coredump to include those regions).

-- 
John Baldwin