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- CORE(5) FILE FORMATS CORE(5)
-
-
-
- NAME
- core - format of memory image file
-
- SYNOPSIS
- #include <sys/core.h>
-
- DESCRIPTION
- The operating system writes out a memory image of a ter-
- minated process when any of various errors occur. See
- sigvec(2) for the list of reasons; the most common are
- memory violations, illegal instructions, bus errors, and
- user-generated quit signals. The memory image is called
- core and is written in the process's working directory (pro-
- vided it can be; normal access controls apply). Set-user-ID
- and set-group-ID programs do not produce core files when
- they terminate as this would cause a security loophole.
-
- The maximum size of a core file is limited by setrlimit (see
- getrlimit(2)). Files which would be larger than the limit
- are not created.
-
- The core file consists of a core structure, as defined in
- the <sys/core.h> file, followed by the data pages and then
- the stack pages of the process image. The core structure
- includes the program's header, the size of the text, data,
- and stack segments, the name of the program and the number
- of the signal that terminated the process. The program's
- header is described by the exec structure defined in the
- <sys/exec.h> file, except on Sun386i systems.
-
- struct core {
- int c_magic; /* Corefile magic number */
- int c_len; /* Sizeof (struct core) */
- struct regs c_regs;/* General purpose registers */
- struct exec c_aouthdr;/* A.out header */
- int c_signo; /* Killing signal, if any */
- int c_tsize; /* Text size (bytes) */
- int c_dsize; /* Data size (bytes) */
- int c_ssize; /* Stack size (bytes) */
- char c_cmdname[CORE_NAMELEN + 1]; /* Command name */
- struct fpu c_fpu;/* external FPU state */
- int c_ucode; /* Exception no. from u_code */
- };
-
- The members of the structure are:
-
- c_magic The magic number CORE_MAGIC , as defined in
- <sys/core.h>.
-
- c_len The length of the core structure in the core
- file. This need not be equal to the current
- size of a core structure as defined in
-
-
-
- Sun Release 4.1 Last change: 18 February 1988 1
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-
-
- CORE(5) FILE FORMATS CORE(5)
-
-
-
- <sys/core.h>, as the core file may have been
- produced on a different release of the SunOS
- operating system.
-
- c_regs The general purpose registers at the time the
- core file was produced. This structure is
- machine-dependent.
-
- c_aouthdr The executable image header of the program.
-
- c_signo The number of the signal that terminated the
- process; see sigvec(2).
-
- c_tsize The size of the text segment of the process
- at the time the core file was produced.
-
- c_dsize The size of the data segment of the process
- at the time the core file was produced. This
- gives the amount of data space image in the
- core file.
-
- c_ssize The size of the stack segment of the process
- at the time the core file was produced. This
- gives the amount of stack space image in the
- core file.
-
- c_cmdname The first CORE_NAMELEN characters of the last
- component of the path name of the program.
-
- c_fpu The status of the floating point hardware at
- the time the core file was produced.
-
- c_ucode The signal code of the signal that terminated
- the process, if any. See sigvec(2).
-
- SEE ALSO
- adb(1), dbx(1), getrlimit(2), sigvec(2)
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- Sun Release 4.1 Last change: 18 February 1988 2
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