09-19-2002
Quote:
Originally posted by auswipe
While you may not be able to step through the core file, you can identify the app that caused the core and the time that the core was dumped. I would then backtrack and see what could have happened that caused a normally stable app to core out.
Never thought of that - smart a**!
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core(4) Kernel Interfaces Manual core(4)
NAME
core - format of core image file
DESCRIPTION
The HP-UX system writes out a file containing a core image of a terminated process when certain signals are received (see signal(5) for the
list of reasons). The most common causes are memory violations, illegal instructions, floating point exceptions, bus errors, and user-gen-
erated quit signals. The core image file is called and is written in the process's working directory (provided it is allowed by normal
access controls). A process with an effective user ID different from its real user ID does not produce a core image.
The file contains sufficient information to determine what the process was doing at the time of its termination. Core file contents con-
sist of objects that represent different segments of a process. Each object is preceded by a data structure, and each data structure
describes the corresponding object following it. The structure is defined in and includes the following members:
The space and addr members specify the virtual memory address in the process where the described object began. The len member is the
length of the object in bytes.
The following possible values for type are defined in
Process data as it existed at the time the core image was created.
This includes initialized data, uninitialized data, and the heap at the time the core image is generated.
A compiler-dependent data structure containing the exec data structure,
the magic number of the executable file, and the command (see the declaration of the structure in
The version number of the core format produced.
This number changes with each HP-UX release where the core format itself has changed. However, it does not neces-
sarily change with every HP-UX release. can thus be easily used by core-reading tools to determine whether they
are compatible with a given core image. This type is expressed by a four-byte binary integer.
The null-terminated version string associated with the kernel
at the time the core image was generated.
An architecture-dependent data structure
containing per-process information such as hardware register contents. See the declaration of the structure in
Process stack contents at the time the core image was created.
Objects dumped in a image file are not arranged in any particular order. Use information to determine the type of the object that immedi-
ately follows it.
SEE ALSO
adb(1), coreadm(1M), coreadm(2), setuid(2), crt0(3), end(3C), signal(5).
core(4)