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