C Tips: Generating a Bugcheck; Triggering a System Crash

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http://64.223.189.234/node/471

Submitted by Hoff on August 15, 2007 - 00:39.

Tagged: C • OpenVMS • OpenVMS Alpha • OpenVMS I64 • Porting • Programming • Tips

The following describes how to trigger a bugcheck…

By default, a system bugcheck can only be triggered in executive or kernel mode. Outer-mode bugchecks will trigger application exit, but will only trigger a system crash if the OpenVMS system parameter BUGCHEKFATAL is set to promote non-privileged bugcheck requests into system bugchecks.

In a C application, an OpenVMS Alpha routine that calls the bug_check macro looks like this:

#define __NEW_STARLET#include <ssdef.h>#include <starlet.h>#include <stdlib.h>#include <vms_macros.h> /* from sys$lib_c.tlb */int ByeByeBugCheck()  {  bug_check( INCONSTATE, FATAL, COLD );  return SSC Tips: Generating a Bugcheck; Triggering a System Crash
http://64.223.189.234/node/471
Submitted by Hoff on August 15, 2007 - 00:39.Tagged: C  •  OpenVMS  •  OpenVMS Alpha  •  OpenVMS I64  •  Porting  •  Programming  •  Tips 
The following describes how to trigger a bugcheck…
By default, a system bugcheck can only be triggered in executive or kernel mode. Outer-mode bugchecks will trigger application exit, but will only trigger a system crash if the OpenVMS system parameter BUGCHEKFATAL is set to promote non-privileged bugcheck requests into system bugchecks.
In a C application, an OpenVMS Alpha routine that calls the bug_check macro looks like this:
___FCKpd___0
The CC compilation command for the above source code module is CC module_name.c + SYS$LIBRARY:SYS$LIB_C.TLB/LIBRARY.
CMKRNL privilege is required for the sys$cmkrnl call.
Both OpenVMS Alpha and OpenVMS I64 also support the following construct:
#include <pal_builtins.h>
void __PAL_BUGCHK( bugcheck_code );
This PAL call replaces the bug_check call shown above, and you'll need to add the required include file.
The __PAL_BUGCHK call is an SRM firmware PAL call on OpenVMS Alpha, and translated into a compiler break directive available within the OpenVMS I64 C compiler. 
BUGCHECK;  }main()  {  unsigned int ArghList[] = { 0 };  int RetStat;  RetStat = sys$cmkrnl( ByeByeBugCheck, ArghList);  exit( EXIT_FAILURE );  }

The CC compilation command for the above source code module is CC module_name.c + SYS$LIBRARY:SYS$LIB_C.TLB/LIBRARY.

CMKRNL privilege is required for the sys$cmkrnl call.

Both OpenVMS Alpha and OpenVMS I64 also support the following construct:
#include <pal_builtins.h> void __PAL_BUGCHK( bugcheck_code );
This PAL call replaces the bug_check call shown above, and you'll need to add the required include file.

The __PAL_BUGCHK call is an SRM firmware PAL call on OpenVMS Alpha, and translated into a compiler break directive available within the OpenVMS I64 C compiler.