10654 savecore(1M) should be able to work on read-only dump devices
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: John Levon <john.levon@joyent.com>
Reviewed by: Andy Stormont <astormont@racktopsystems.com>
Reviewed by: Gergő Doma <domag02@gmail.com>
Reviewed by: Toomas Soome <tsoome@me.com>

*** 4,14 ****
  
  NAME
         savecore - save a crash dump of the operating system
  
  SYNOPSIS
!        /usr/bin/savecore [-Lvd] [-f dumpfile] [directory]
  
  
  DESCRIPTION
         The savecore utility saves a crash dump of the kernel (assuming that
         one was made) and writes a reboot message in the shutdown log. By
--- 4,14 ----
  
  NAME
         savecore - save a crash dump of the operating system
  
  SYNOPSIS
!        /usr/bin/savecore [-L | -r] [-vd] [-f dumpfile] [directory]
  
  
  DESCRIPTION
         The savecore utility saves a crash dump of the kernel (assuming that
         one was made) and writes a reboot message in the shutdown log. By
*** 71,80 ****
--- 71,88 ----
                        of memory continue to change while the dump is saved.
                        This means that live crash dumps are not fully self-
                        consistent.
  
  
+        -r
+                       Open the dump device or file as read-only, and don't
+                       update the dump header or do anything else that might
+                       modify the crash dump. This option can be used to
+                       recover a crash dump from a read-only device. This flag
+                       cannot be used in conjunction with -L.
+ 
+ 
         -v
                        Verbose. Enables verbose error messages from savecore.
  
  
  OPERANDS
*** 134,139 ****
         savecore very soon after booting, before the swap space containing the
         crash dump is overwritten by programs currently running.
  
  
  
!                                January 30, 2013                   SAVECORE(1M)
--- 142,147 ----
         savecore very soon after booting, before the swap space containing the
         crash dump is overwritten by programs currently running.
  
  
  
!                                February 22, 2019                  SAVECORE(1M)