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/* Copyright (c) 2021, MariaDB Corporation.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
#include "mariadb.h"
#include "sql_class.h"
#include "debug.h"
/**
Debug utility to do crash after a set number of executions
The user variable, either @debug_crash_counter or @debug_error_counter,
is decremented each time debug_crash() or debug_simulate_error is called
if the keyword is set with @@debug_push, like
@@debug_push="d+frm_data_type_info_emulate"
If the variable is not set or is not an integer it will be ignored.
*/
#ifndef DBUG_OFF
static const LEX_CSTRING debug_crash_counter=
{ STRING_WITH_LEN("debug_crash_counter") };
static const LEX_CSTRING debug_error_counter=
{ STRING_WITH_LEN("debug_error_counter") };
bool debug_decrement_counter(const LEX_CSTRING *name)
{
THD *thd= current_thd;
user_var_entry *entry= (user_var_entry*)
my_hash_search(&thd->user_vars, (uchar*) name->str, name->length);
if (!entry || !entry->value ||
entry->type_handler()->result_type() != INT_RESULT)
return 0;
(*(ulonglong*) entry->value)= (*(ulonglong*) entry->value)-1;
return !*(ulonglong*) entry->value;
}
void debug_crash_here(const char *keyword)
{
DBUG_ENTER("debug_crash_here");
DBUG_PRINT("enter", ("keyword: %s", keyword));
DBUG_EXECUTE_IF(keyword,
if (debug_decrement_counter(&debug_crash_counter))
{
my_printf_error(ER_INTERNAL_ERROR,
"Crashing at %s",
MYF(ME_ERROR_LOG | ME_NOTE), keyword);
DBUG_SUICIDE();
});
DBUG_VOID_RETURN;
}
/*
This can be used as debug_counter to simulate an error at a specific
position.
Typical usage would be
if (debug_simualte_error("keyword"))
error= 1;
*/
bool debug_simulate_error(const char *keyword, uint error)
{
DBUG_ENTER("debug_crash_here");
DBUG_PRINT("enter", ("keyword: %s", keyword));
DBUG_EXECUTE_IF(keyword,
if (debug_decrement_counter(&debug_error_counter))
{
my_printf_error(error,
"Simulating error for '%s'",
MYF(ME_ERROR_LOG), keyword);
DBUG_RETURN(1);
});
DBUG_RETURN(0);
}
#endif /* DBUG_OFF */
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