[Zope-dev] recipe for trapping SIGSEGV and SIGILL signals on solaris

[Joseph Wayne Norton]

Matt -

Well, your patch seems fine in our testing environment.
Unfortunately, we do not see any restarts in the testing environment
... always in production.  I had to rebuild our entire software base
because we are using other products that use extensions class and they
are not included under the main zope installation.  It caused a bus
error the first time (with only running wo_pcgi.py).

As I mentioned in my prior e-mail, I modified the patch slightly to
exactly match the struct in Python's object.h.  Please review this
patch.  I will apply the patch in production tomorrow morning, 12/13,
(Japan Standard Time or GMT+9) and monitor the system.  If zope does
not restart during the day, then I think you have fixed the problem.

I'm using Zope 2.4.3 and Python 2.1.1 with pymalloc disabled on the
solaris platform.

thanks and regards,

- joe n.

p.s. I looked **briefly** at the Zope 2.5 source and this patch will
not be compatible since there doesn't seem to be a standard among the
different extension classes on whether to include or not include the
COUNT_ALLOCS define.  The cAccessControl class seems to be the
exception.



*** ExtensionClass.h.bak        Fri Nov 16 10:37:11 2001
--- ExtensionClass.h    Wed Dec 12 15:10:03 2001
***************
*** 136,154 ****
        PySequenceMethods *tp_as_sequence;
        PyMappingMethods *tp_as_mapping;
  
!       /* More standard operations (at end for binary compatibility) */
  
        hashfunc tp_hash;
        ternaryfunc tp_call;
        reprfunc tp_str;
        getattrofunc tp_getattro;
        setattrofunc tp_setattro;
!       /* Space for future expansion */
!       long tp_xxx3;
!       long tp_xxx4;
  
        char *tp_doc; /* Documentation string */
  
  #ifdef COUNT_ALLOCS
        /* these must be last */
        int tp_alloc;
--- 136,169 ----
        PySequenceMethods *tp_as_sequence;
        PyMappingMethods *tp_as_mapping;
  
!       /* More standard operations (here for binary compatibility) */
  
        hashfunc tp_hash;
        ternaryfunc tp_call;
        reprfunc tp_str;
        getattrofunc tp_getattro;
        setattrofunc tp_setattro;
! 
!       /* Functions to access object as input/output buffer */
!       PyBufferProcs *tp_as_buffer;
!       
!       /* Flags to define presence of optional/expanded features */
!       long tp_flags;
  
        char *tp_doc; /* Documentation string */
  
+       /* call function for all accessible objects */
+       traverseproc tp_traverse;
+       
+       /* delete references to contained objects */
+       inquiry tp_clear;
+ 
+       /* rich comparisons */
+       richcmpfunc tp_richcompare;
+ 
+       /* weak reference enabler */
+       long tp_weaklistoffset;
+ 
  #ifdef COUNT_ALLOCS
        /* these must be last */
        int tp_alloc;
***************
*** 302,308 ****
     { PyExtensionClassCAPI->Export(D,N,&T); }
  
  /* Convert a method list to a method chain.  */
! #define METHOD_CHAIN(DEF) { DEF, NULL }
  
  /* The following macro checks whether a type is an extension class: */
  #define PyExtensionClass_Check(TYPE) \
--- 317,330 ----
     { PyExtensionClassCAPI->Export(D,N,&T); }
  
  /* Convert a method list to a method chain.  */
! /* MTK -- make it pad the type structure out -- presumes only use is in
! ** type structure initialization
! */
! #ifdef COUNT_ALLOCS
! #define METHOD_CHAIN(DEF) 0,0,0,0,0,0,0,0,{ DEF, NULL }
! #else
! #define METHOD_CHAIN(DEF) 0,0,0,0,{ DEF, NULL }
! #endif
  
  /* The following macro checks whether a type is an extension class: */
  #define PyExtensionClass_Check(TYPE) \
***************
*** 336,342 ****
  #define PURE_MIXIN_CLASS(NAME,DOC,METHODS) \
  static PyExtensionClass NAME ## Type = { PyObject_HEAD_INIT(NULL) \
        0, # NAME, sizeof(PyPureMixinObject), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
!       0, 0, 0, 0, 0, 0, 0, DOC, {METHODS, NULL}, \
          EXTENSIONCLASS_BASICNEW_FLAG}
  
  /* The following macros provide limited access to extension-class
--- 358,364 ----
  #define PURE_MIXIN_CLASS(NAME,DOC,METHODS) \
  static PyExtensionClass NAME ## Type = { PyObject_HEAD_INIT(NULL) \
        0, # NAME, sizeof(PyPureMixinObject), 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
!       0, 0, 0, 0, 0, 0, 0, DOC, METHOD_CHAIN(METHODS), \
          EXTENSIONCLASS_BASICNEW_FLAG}
  
  /* The following macros provide limited access to extension-class