Description:
mysql_prepare fails with a SIGSEGV signal. The attached is a slightly modified version of the example for prepared statements API calls. It used to work, but now crashes every time.
How to repeat:
/* Headers for standard C library routines */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string>
#include <mysql.h>
#include <errmsg.h>
#define STRING_SIZE 50
#define SELECT_SAMPLE "SELECT module_key,module_name,timestamp FROM zUtlModule"
int main(int argc, char **argv)
{
MYSQL mysql;
MYSQL_STMT *stmt;
MYSQL_BIND bind[4];
MYSQL_RES *prepare_meta_result;
MYSQL_TIME ts;
unsigned long length[4];
int param_count, column_count, row_count;
char small_data[4];
int int_data;
char str_data[STRING_SIZE];
my_bool is_null[4];
mysql_init(&mysql);
mysql_options(&mysql,MYSQL_OPT_COMPRESS,0);
/* Prepare a SELECT query to fetch data from test_table */
stmt = mysql_prepare(&mysql, SELECT_SAMPLE, strlen(SELECT_SAMPLE));
if (!stmt)
{
fprintf(stderr, " mysql_prepare(), SELECT failed\n");
fprintf(stderr, " %s\n", mysql_error(&mysql));
exit(0);
}
fprintf(stdout, " prepare, SELECT successful\n");
/* Get the parameter count from the statement */
param_count= mysql_param_count(stmt);
fprintf(stdout, " total parameters in SELECT: %d\n", param_count);
if (param_count != 0) /* validate parameter count */
{
fprintf(stderr, " invalid parameter count returned by MySQL\n");
exit(0);
}
/* Fetch result set meta information */
prepare_meta_result = mysql_get_metadata(stmt);
if (!prepare_meta_result)
{
fprintf(stderr, " mysql_get_metadata(), returned no meta information\n");
fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
exit(0);
}
/* Get total columns in the query */
column_count= mysql_num_fields(prepare_meta_result);
fprintf(stdout, " total columns in SELECT statement: %d\n", column_count);
if (column_count != 3) /* validate column count */
{
fprintf(stderr, " invalid column count returned by MySQL\n");
exit(0);
}
/* Execute the SELECT query */
if (mysql_execute(stmt))
{
fprintf(stderr, " mysql_execute(), failed\n");
fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
exit(0);
}
/* Bind the result buffers for all 4 columns before fetching them */
/* INTEGER COLUMN */
bind[0].buffer_type= MYSQL_TYPE_LONG;
bind[0].buffer= (char *)&int_data;
bind[0].is_null= &is_null[0];
bind[0].length= &length[0];
/* STRING COLUMN */
bind[1].buffer_type= MYSQL_TYPE_VAR_STRING;
bind[1].buffer= (char *)str_data;
bind[1].buffer_length= STRING_SIZE;
bind[1].is_null= &is_null[1];
bind[1].length= &length[1];
/* TIMESTAMP COLUMN */
bind[3].buffer_type= MYSQL_TYPE_TIMESTAMP;
bind[3].buffer= (char *)&ts;
bind[3].is_null= &is_null[3];
bind[3].length= &length[3];
/* Bind the result buffers */
if (mysql_bind_result(stmt, bind))
{
fprintf(stderr, " mysql_bind_result() failed\n");
fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
exit(0);
}
/* Now buffer all results to client */
if (mysql_stmt_store_result(stmt))
{
fprintf(stderr, " mysql_stmt_store_result() failed\n");
fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
exit(0);
}
/* Fetch all rows */
row_count= 0;
fprintf(stdout, "Fetching results ...\n");
while (!mysql_fetch(stmt))
{
row_count++;
fprintf(stdout, " row %d\n", row_count);
/* column 1 */
fprintf(stdout, " column1 (integer) : ");
if (is_null[0])
fprintf(stdout, " NULL\n");
else
fprintf(stdout, " %d(%ld)\n", int_data, length[0]);
/* column 2 */
fprintf(stdout, " column2 (string) : ");
if (is_null[1])
fprintf(stdout, " NULL\n");
else
fprintf(stdout, " %s(%ld)\n", str_data, length[1]);
/* column 4 */
fprintf(stdout, " column4 (timestamp): ");
if (is_null[3])
fprintf(stdout, " NULL\n");
else
fprintf(stdout, " %04d-%02d-%02d %02d:%02d:%02d (%ld)\n",
ts.year, ts.month, ts.day,
ts.hour, ts.minute, ts.second,
length[3]);
fprintf(stdout, "\n");
}
/* Validate rows fetched */
fprintf(stdout, " total rows fetched: %d\n", row_count);
/* Free the prepared result metadata */
mysql_free_result(prepare_meta_result);
/* Close the statement */
if (mysql_stmt_close(stmt))
{
fprintf(stderr, " failed while closing the statement\n");
fprintf(stderr, " %s\n", mysql_stmt_error(stmt));
exit(0);
}
}
Description: mysql_prepare fails with a SIGSEGV signal. The attached is a slightly modified version of the example for prepared statements API calls. It used to work, but now crashes every time. How to repeat: /* Headers for standard C library routines */ #include <stdlib.h> #include <stdio.h> #include <time.h> #include <string> #include <mysql.h> #include <errmsg.h> #define STRING_SIZE 50 #define SELECT_SAMPLE "SELECT module_key,module_name,timestamp FROM zUtlModule" int main(int argc, char **argv) { MYSQL mysql; MYSQL_STMT *stmt; MYSQL_BIND bind[4]; MYSQL_RES *prepare_meta_result; MYSQL_TIME ts; unsigned long length[4]; int param_count, column_count, row_count; char small_data[4]; int int_data; char str_data[STRING_SIZE]; my_bool is_null[4]; mysql_init(&mysql); mysql_options(&mysql,MYSQL_OPT_COMPRESS,0); /* Prepare a SELECT query to fetch data from test_table */ stmt = mysql_prepare(&mysql, SELECT_SAMPLE, strlen(SELECT_SAMPLE)); if (!stmt) { fprintf(stderr, " mysql_prepare(), SELECT failed\n"); fprintf(stderr, " %s\n", mysql_error(&mysql)); exit(0); } fprintf(stdout, " prepare, SELECT successful\n"); /* Get the parameter count from the statement */ param_count= mysql_param_count(stmt); fprintf(stdout, " total parameters in SELECT: %d\n", param_count); if (param_count != 0) /* validate parameter count */ { fprintf(stderr, " invalid parameter count returned by MySQL\n"); exit(0); } /* Fetch result set meta information */ prepare_meta_result = mysql_get_metadata(stmt); if (!prepare_meta_result) { fprintf(stderr, " mysql_get_metadata(), returned no meta information\n"); fprintf(stderr, " %s\n", mysql_stmt_error(stmt)); exit(0); } /* Get total columns in the query */ column_count= mysql_num_fields(prepare_meta_result); fprintf(stdout, " total columns in SELECT statement: %d\n", column_count); if (column_count != 3) /* validate column count */ { fprintf(stderr, " invalid column count returned by MySQL\n"); exit(0); } /* Execute the SELECT query */ if (mysql_execute(stmt)) { fprintf(stderr, " mysql_execute(), failed\n"); fprintf(stderr, " %s\n", mysql_stmt_error(stmt)); exit(0); } /* Bind the result buffers for all 4 columns before fetching them */ /* INTEGER COLUMN */ bind[0].buffer_type= MYSQL_TYPE_LONG; bind[0].buffer= (char *)&int_data; bind[0].is_null= &is_null[0]; bind[0].length= &length[0]; /* STRING COLUMN */ bind[1].buffer_type= MYSQL_TYPE_VAR_STRING; bind[1].buffer= (char *)str_data; bind[1].buffer_length= STRING_SIZE; bind[1].is_null= &is_null[1]; bind[1].length= &length[1]; /* TIMESTAMP COLUMN */ bind[3].buffer_type= MYSQL_TYPE_TIMESTAMP; bind[3].buffer= (char *)&ts; bind[3].is_null= &is_null[3]; bind[3].length= &length[3]; /* Bind the result buffers */ if (mysql_bind_result(stmt, bind)) { fprintf(stderr, " mysql_bind_result() failed\n"); fprintf(stderr, " %s\n", mysql_stmt_error(stmt)); exit(0); } /* Now buffer all results to client */ if (mysql_stmt_store_result(stmt)) { fprintf(stderr, " mysql_stmt_store_result() failed\n"); fprintf(stderr, " %s\n", mysql_stmt_error(stmt)); exit(0); } /* Fetch all rows */ row_count= 0; fprintf(stdout, "Fetching results ...\n"); while (!mysql_fetch(stmt)) { row_count++; fprintf(stdout, " row %d\n", row_count); /* column 1 */ fprintf(stdout, " column1 (integer) : "); if (is_null[0]) fprintf(stdout, " NULL\n"); else fprintf(stdout, " %d(%ld)\n", int_data, length[0]); /* column 2 */ fprintf(stdout, " column2 (string) : "); if (is_null[1]) fprintf(stdout, " NULL\n"); else fprintf(stdout, " %s(%ld)\n", str_data, length[1]); /* column 4 */ fprintf(stdout, " column4 (timestamp): "); if (is_null[3]) fprintf(stdout, " NULL\n"); else fprintf(stdout, " %04d-%02d-%02d %02d:%02d:%02d (%ld)\n", ts.year, ts.month, ts.day, ts.hour, ts.minute, ts.second, length[3]); fprintf(stdout, "\n"); } /* Validate rows fetched */ fprintf(stdout, " total rows fetched: %d\n", row_count); /* Free the prepared result metadata */ mysql_free_result(prepare_meta_result); /* Close the statement */ if (mysql_stmt_close(stmt)) { fprintf(stderr, " failed while closing the statement\n"); fprintf(stderr, " %s\n", mysql_stmt_error(stmt)); exit(0); } }