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/* Copyright (C) 2000-2003 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#ifndef ERROR_INJECT_SUPPORT
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* Simple compile-time error injection module to enable easy
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* error printing in case of a crash
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#ifndef DRIZZLE_SERVER_ERROR_INJECTION_H
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#define DRIZZLE_SERVER_ERROR_INJECTION_H
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Error injector Macros to enable easy testing of recovery after failures
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in various error cases.
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#define ERROR_INJECT(x) 0
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#define ERROR_INJECT_ACTION(x,action) 0
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#define ERROR_INJECT_CRASH(x) 0
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#define ERROR_INJECT_VALUE(x) 0
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#define ERROR_INJECT_VALUE_ACTION(x,action) 0
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#define ERROR_INJECT_VALUE_CRASH(x) 0
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#define SET_ERROR_INJECT_VALUE(x)
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inline bool check_and_unset_keyword(const char *dbug_str)
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const char *extra_str= "-d,";
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if (_db_strict_keyword_ (dbug_str))
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strxmov(total_str, extra_str, dbug_str, NullS);
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check_and_unset_inject_value(int value)
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THD *thd= current_thd;
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if (thd->error_inject_value == (uint)value)
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thd->error_inject_value= 0;
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These macros are used to insert macros from the application code.
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The event that activates those error injections can be activated
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SET SESSION dbug=+d,code;
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After the error has been injected, the macros will automatically
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remove the debug code, thus similar to using:
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SET SESSION dbug=-d,code
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ERROR_INJECT_CRASH will inject a crash of the MySQL Server if code
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is set when macro is called. ERROR_INJECT_CRASH can be used in
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if-statements, it will always return false unless of course it
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crashes in which case it doesn't return at all.
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ERROR_INJECT_ACTION will inject the action specified in the action
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parameter of the macro, before performing the action the code will
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be removed such that no more events occur. ERROR_INJECT_ACTION
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can also be used in if-statements and always returns FALSE.
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ERROR_INJECT can be used in a normal if-statement, where the action
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part is performed in the if-block. The macro returns TRUE if the
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error was activated and otherwise returns FALSE. If activated the
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Sometimes it is necessary to perform error inject actions as a serie
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of events. In this case one can use one variable on the THD object.
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Thus one sets this value by using e.g. SET_ERROR_INJECT_VALUE(100).
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Then one can later test for it by using ERROR_INJECT_CRASH_VALUE,
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ERROR_INJECT_ACTION_VALUE and ERROR_INJECT_VALUE. This have the same
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behaviour as the above described macros except that they use the
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error inject value instead of a code used by debug macros.
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#define SET_ERROR_INJECT_VALUE(x) \
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current_thd->error_inject_value= (x)
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#define ERROR_INJECT_ACTION(code, action) \
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(check_and_unset_keyword(code) ? ((action), 0) : 0)
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#define ERROR_INJECT(code) \
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check_and_unset_keyword(code)
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#define ERROR_INJECT_VALUE(value) \
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check_and_unset_inject_value(value)
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#define ERROR_INJECT_VALUE_ACTION(value,action) \
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(check_and_unset_inject_value(value) ? (action) : 0)
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#define ERROR_INJECT_VALUE_CRASH(value) \
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ERROR_INJECT_VALUE_ACTION(value, (abort(), 0))
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#endif /* DRIZZLE_SERVER_ERROR_INJECTION_H */
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#endif /* ERROR_INJECT_SUPPORT */
added
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drizzled/error_injection.h
