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- Notes for release 1.8 of Crashme. 27-SEP-1991 GJC@MITECH.COM
-
- Many people have suggested that the output of previous versions was
- far too verbose, and that that was not only anoying but also
- effectively slowing down the program. Therefore there is a new argument
- available after the subprocess control argument, which is a verboseness
- level from 0 to 5. Using a level of 2 will print out only summary
- information about the runs. e.g.
-
- $ crashme +2000 666 50 00:30:00 2
- Crashme: (c) Copyright 1990, 1991 George J. Carrette
- Version: 1.7 25-SEP-1991
- Subprocess run for 1800 seconds (0 00:30:00)
- Test complete, total real time: 1801 seconds (0 00:30:01)
- exit status ... number of cases
- 1100 ... 2
- 3522652 ... 4
- 1036 ... 1
- 1084 ... 7
- 1108 ... 19
- 1 ... 432
- 12 ... 137
-
- The table of exit status codes and frequencies is a new interesting
- aspect of the test. This test was run on a VMS system, so that we have
- a normal process exit 432 times, access violation 137 times,
- and reserved operand fault 19 times, etc. As the number of tries goes
- up (50 in this case) we would expect that the number of normal process
- exits to go down.
-
- Here is some output supplied by nik@infonode.ingr.com on one of his machines.
-
- Processor : Intergraph Clipper C300 RISC processor
- 16Mb memory + 4k I cache and 4K D cache
-
- Operating System: CLIX Version c.5.3.2
- derived from AT&T SVR 3.1 with BSD enhancements.
-
- Crashme: (c) Copyright 1990, 1991 George J. Carrette
- Version: 1.7 25-SEP-1991
- Subprocess run for 9000 seconds (0 02:30:00)
- Test complete, total real time: 9004 seconds (0 02:30:04)
- exit status ... number of cases
- 136 ... 1
- 24576 ... 1
- 14 ... 1
- 138 ... 11
- 135 ... 27
- 140 ... 26
- 132 ... 430
- 139 ... 18
- 12800 ... 567
-
- The status values here could be decoded by reading the documentation
- for the "wait" system procedure, and looking up the correct part of
- the value in the sys_errlist[] array. That is left as an exersize for the
- reader.
-
- ------------------------------------------------------------------------
-
- To compile, some systems may need #include <sys/types.h>.
-
- Also, note the conditionalized code in bad_malloc. If your system
- only gets the signal "segmentation violation" then you may need
- to consider conditionalizations along this line.
-
- However, on a machine with a segmented address space, that has
- "instructions" in one segment and "data" in another, it is highly
- unlikely that the code for setting up and invoking the "void (*badboy)()"
- will have any interesting effect. Nothing other than an easily
- handled SIGSEGV will result in the inner testing loop.
-
- Some INTEL 80386 and DEC PDP-11 systems would be examples of this situation.
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