Current File : //usr/include/mysql/server/mysql/service_thd_rnd.h
#ifndef MYSQL_SERVICE_THD_RND_INCLUDED
/* Copyright (C) 2017 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, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/**
@file
This service provides access to the thd-local random number generator.
It's preferable over the global one, because concurrent threads
can generate random numbers without fighting each other over the access
to the shared rnd state.
*/
#ifdef __cplusplus
extern "C" {
#endif
#ifndef MYSQL_ABI_CHECK
#include <stdlib.h>
#endif
extern struct thd_rnd_service_st {
double (*thd_rnd_ptr)(MYSQL_THD thd);
void (*thd_c_r_p_ptr)(MYSQL_THD thd, char *to, size_t length);
} *thd_rnd_service;
#ifdef MYSQL_DYNAMIC_PLUGIN
#define thd_rnd(A) thd_rnd_service->thd_rnd_ptr(A)
#define thd_create_random_password(A,B,C) thd_rnd_service->thd_c_r_p_ptr(A,B,C)
#else
double thd_rnd(MYSQL_THD thd);
/**
Generate string of printable random characters of requested length.
@param to[out] Buffer for generation; must be at least length+1 bytes
long; result string is always null-terminated
@param length[in] How many random characters to put in buffer
*/
void thd_create_random_password(MYSQL_THD thd, char *to, size_t length);
#endif
#ifdef __cplusplus
}
#endif
#define MYSQL_SERVICE_THD_RND_INCLUDED
#endif
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