man(1) Manual page archive

     CORE(5)                                                   CORE(5)

          core - format of memory image file

          A memory image of a terminated process is written into file
          when any of various errors occur; see signal(2). The memory
          image is written in the process's working directory, if it
          can be; normal access controls apply.

          A core file consists of a copy of the user block for the
          terminated process, followed by an image of its data and
          stack segments.  The user block, which occupies 5K bytes,
          contains descriptive information about the process and a
          stack used by the operating system when serving the process;
          see the include file <sys/user.h>.

          adb(1), pi(9.1), bigcore(1), signal(2)