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The patch adds two new macros, TUNABLE_GET_DEFAULT and TUNABLE_IS_INITIALIZED, here the former get the default value with a signature similar to TUNABLE_GET, while the later returns whether the tunable was set by the environment variable. Checked on x86_64-linux-gnu. Reviewed-by: DJ Delorie <dj@redhat.com> Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/* Internal representation of tunables.
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Copyright (C) 2016-2023 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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<https://www.gnu.org/licenses/>. */
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#ifndef _TUNABLE_TYPES_H_
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#define _TUNABLE_TYPES_H_
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/* Note: This header is included in the generated dl-tunables-list.h and
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only used internally in the tunables implementation in dl-tunables.c. */
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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typedef enum
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{
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TUNABLE_TYPE_INT_32,
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TUNABLE_TYPE_UINT_64,
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TUNABLE_TYPE_SIZE_T,
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TUNABLE_TYPE_STRING
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} tunable_type_code_t;
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typedef struct
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{
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tunable_type_code_t type_code;
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tunable_num_t min;
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tunable_num_t max;
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} tunable_type_t;
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/* Security level for tunables. This decides what to do with individual
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tunables for AT_SECURE binaries. */
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typedef enum
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{
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/* Erase the tunable for AT_SECURE binaries so that child processes don't
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read it. */
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TUNABLE_SECLEVEL_SXID_ERASE = 0,
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/* Ignore the tunable for AT_SECURE binaries, but don't erase it, so that
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child processes can read it. */
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TUNABLE_SECLEVEL_SXID_IGNORE = 1,
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/* Read the tunable. */
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TUNABLE_SECLEVEL_NONE = 2,
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} tunable_seclevel_t;
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/* A tunable. */
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struct _tunable
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{
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const char name[TUNABLE_NAME_MAX]; /* Internal name of the tunable. */
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tunable_type_t type; /* Data type of the tunable. */
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const tunable_val_t def; /* The value. */
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tunable_val_t val; /* The value. */
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bool initialized; /* Flag to indicate that the tunable is
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initialized. */
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/* Compatibility elements. */
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const char env_alias[TUNABLE_ALIAS_MAX]; /* 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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static __always_inline bool
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unsigned_tunable_type (tunable_type_code_t t)
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{
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switch (t)
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{
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case TUNABLE_TYPE_INT_32:
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return false;
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case TUNABLE_TYPE_UINT_64:
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case TUNABLE_TYPE_SIZE_T:
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return true;
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case TUNABLE_TYPE_STRING:
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default:
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break;
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}
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__builtin_unreachable ();
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}
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#endif
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