elf/dl-tunable-types.h

   1 /* Tunable type information.
   2
   3    Copyright (C) 2016-2019 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef _TUNABLE_TYPES_H_
  21 # define _TUNABLE_TYPES_H_
  22 #include <stddef.h>
  23
  24 typedef enum
  25 {
  26   TUNABLE_TYPE_INT_32,
  27   TUNABLE_TYPE_UINT_64,
  28   TUNABLE_TYPE_SIZE_T,
  29   TUNABLE_TYPE_STRING
  30 } tunable_type_code_t;
  31
  32 typedef struct
  33 {
  34   tunable_type_code_t type_code;
  35   int64_t min;
  36   int64_t max;
  37 } tunable_type_t;
  38
  39 typedef union
  40 {
  41   int64_t numval;
  42   const char *strval;
  43 } tunable_val_t;
  44
  45 typedef void (*tunable_callback_t) (tunable_val_t *);
  46
  47 /* Security level for tunables.  This decides what to do with individual
  48    tunables for AT_SECURE binaries.  */
  49 typedef enum
  50 {
  51   /* Erase the tunable for AT_SECURE binaries so that child processes don't
  52      read it.  */
  53   TUNABLE_SECLEVEL_SXID_ERASE = 0,
  54   /* Ignore the tunable for AT_SECURE binaries, but don't erase it, so that
  55      child processes can read it.  */
  56   TUNABLE_SECLEVEL_SXID_IGNORE = 1,
  57   /* Read the tunable.  */
  58   TUNABLE_SECLEVEL_NONE = 2,
  59 } tunable_seclevel_t;
  60
  61
  62 #endif