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gdb: gcore man

 
 gcore
 =====
 
 gcore [-a] [-o PREFIX] PID1 [PID2...PIDN]
 
    Generate core dumps of one or more running programs with process IDs
 PID1, PID2, etc.  A core file produced by 'gcore' is equivalent to one
 produced by the kernel when the process crashes (and when 'ulimit -c'
 was used to set up an appropriate core dump limit).  However, unlike
 after a crash, after 'gcore' finishes its job the program remains
 running without any change.
 
 '-a'
      Dump all memory mappings.  The actual effect of this option depends
      on the Operating System.  On GNU/Linux, it will disable
      'use-coredump-filter' (set use-coredump-filter) and enable
      'dump-excluded-mappings' (set dump-excluded-mappings).
 
 '-o PREFIX'
      The optional argument PREFIX specifies the prefix to be used when
      composing the file names of the core dumps.  The file name is
      composed as 'PREFIX.PID', where PID is the process ID of the
      running program being analyzed by 'gcore'.  If not specified,
      PREFIX defaults to GCORE.
 

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