core(4)                             CLIX                             core(4)



  NAME

    core - Core image file format

  DESCRIPTION

    The CLIX operating system writes a core image of a terminated process when
    certain errors occur.  See signal for the list of reasons; the most common
    are memory violations, illegal instructions, bus errors, and user-
    generated quit signals.  The core image is called core and is written to
    the process' working directory (if allowed; normal access controls apply).
    A process with an effective user ID different from the real user ID does
    not produce a core image.

    The first section of the core image is a copy of the system's per-user
    data for the process, including the registers as they were at the time of
    the fault.  The size of this section depends on the parameter usize, which
    is defined in <sys/param.h>.  The remainder of the image represents the
    actual contents of the user's core area when the core was written
    (excluding the text area).  For a paged image file, the dump of the data
    segment begins after any portion overlapped with the text section.  Each
    segment in the core file begins on a page boundary.

    The format of the information in the first section is described by the
    user structure of the system, defined in <sys/user.h>.  Not included in
    this file are the locations of the registers; these are outlined in
    <sys/reg.h>.

  RELATED INFORMATION

    Commands:  adb(1), dbg(1), sdb(1), nocore(8)

    Functions:  setuid(2), signal(2)





















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