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/* The tunable framework. See the README to know how to use the tunable in
a glibc module.
Copyright (C) 2016-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef _TUNABLES_H_
#define _TUNABLES_H_
#if !HAVE_TUNABLES
static inline void
__always_inline
__tunables_init (char **unused __attribute__ ((unused)))
{
/* This is optimized out if tunables are not enabled. */
}
#else
# include <stddef.h>
# include "dl-tunable-types.h"
/* A tunable. */
struct _tunable
{
const char *name; /* Internal name of the tunable. */
tunable_type_t type; /* Data type of the tunable. */
tunable_val_t val; /* The value. */
const char *strval; /* The string containing the value,
points into envp. */
tunable_seclevel_t security_level; /* Specify the security level for the
tunable with respect to AT_SECURE
programs. See description of
tunable_seclevel_t to see a
description of the values.
Note that even if the tunable is
read, it may not get used by the
target module if the value is
considered unsafe. */
/* Compatibility elements. */
const char *env_alias; /* The compatibility environment
variable name. */
};
typedef struct _tunable tunable_t;
/* Full name for a tunable is top_ns.tunable_ns.id. */
# define TUNABLE_NAME_S(top,ns,id) #top "." #ns "." #id
# define TUNABLE_ENUM_NAME(top,ns,id) TUNABLE_ENUM_NAME1 (top,ns,id)
# define TUNABLE_ENUM_NAME1(top,ns,id) top ## _ ## ns ## _ ## id
# include "dl-tunable-list.h"
extern void __tunables_init (char **);
extern void __tunable_set_val (tunable_id_t, void *, tunable_callback_t);
rtld_hidden_proto (__tunables_init)
rtld_hidden_proto (__tunable_set_val)
/* Check if the tunable has been set to a non-default value and if it is, copy
it over into __VAL. */
# define TUNABLE_SET_VAL(__id,__val) \
({ \
__tunable_set_val \
(TUNABLE_ENUM_NAME (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id), (__val), \
NULL); \
})
/* Same as TUNABLE_SET_VAL, but also call the callback function __CB. */
# define TUNABLE_SET_VAL_WITH_CALLBACK(__id,__val,__cb) \
({ \
__tunable_set_val \
(TUNABLE_ENUM_NAME (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id), (__val), \
DL_TUNABLE_CALLBACK (__cb)); \
})
/* Namespace sanity for callback functions. Use this macro to keep the
namespace of the modules clean. */
# define DL_TUNABLE_CALLBACK(__name) _dl_tunable_ ## __name
# define TUNABLES_FRONTEND_valstring 1
/* The default value for TUNABLES_FRONTEND. */
# define TUNABLES_FRONTEND_yes TUNABLES_FRONTEND_valstring
#endif
#endif
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