/* The tunable framework. See the README to know how to use the tunable in
a glibc module.
- Copyright (C) 2016-2018 Free Software Foundation, Inc.
+ Copyright (C) 2016-2022 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
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/>. */
+ <https://www.gnu.org/licenses/>. */
#ifndef _TUNABLES_H_
#define _TUNABLES_H_
/* This is optimized out if tunables are not enabled. */
}
#else
-
+# include <stdbool.h>
# include <stddef.h>
-# include "dl-tunable-types.h"
+# include <stdint.h>
+
+typedef intmax_t tunable_num_t;
-/* A tunable. */
-struct _tunable
+typedef union
{
- const char *name; /* Internal name of the tunable. */
- tunable_type_t type; /* Data type of the tunable. */
- tunable_val_t val; /* The value. */
- bool initialized; /* Flag to indicate that the tunable is
- initialized. */
- 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;
+ tunable_num_t numval;
+ const char *strval;
+} tunable_val_t;
+
+typedef void (*tunable_callback_t) (tunable_val_t *);
/* Full name for a tunable is top_ns.tunable_ns.id. */
# define TUNABLE_NAME_S(top,ns,id) #top "." #ns "." #id
# include "dl-tunable-list.h"
extern void __tunables_init (char **);
+extern void __tunables_print (void);
extern void __tunable_get_val (tunable_id_t, void *, tunable_callback_t);
-extern void __tunable_set_val (tunable_id_t, void *);
+extern void __tunable_set_val (tunable_id_t, tunable_val_t *, tunable_num_t *,
+ tunable_num_t *);
rtld_hidden_proto (__tunables_init)
+rtld_hidden_proto (__tunables_print)
rtld_hidden_proto (__tunable_get_val)
+rtld_hidden_proto (__tunable_set_val)
/* Define TUNABLE_GET and TUNABLE_SET in short form if TOP_NAMESPACE and
TUNABLE_NAMESPACE are defined. This is useful shorthand to get and set
#if defined TOP_NAMESPACE && defined TUNABLE_NAMESPACE
# define TUNABLE_GET(__id, __type, __cb) \
TUNABLE_GET_FULL (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id, __type, __cb)
-# define TUNABLE_SET(__id, __type, __val) \
- TUNABLE_SET_FULL (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id, __type, __val)
+# define TUNABLE_SET(__id, __val) \
+ TUNABLE_SET_FULL (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id, __val)
+# define TUNABLE_SET_WITH_BOUNDS(__id, __val, __min, __max) \
+ TUNABLE_SET_WITH_BOUNDS_FULL (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id, \
+ __val, __min, __max)
#else
# define TUNABLE_GET(__top, __ns, __id, __type, __cb) \
TUNABLE_GET_FULL (__top, __ns, __id, __type, __cb)
-# define TUNABLE_SET(__top, __ns, __id, __type, __val) \
- TUNABLE_SET_FULL (__top, __ns, __id, __type, __val)
+# define TUNABLE_SET(__top, __ns, __id, __val) \
+ TUNABLE_SET_FULL (__top, __ns, __id, __val)
+# define TUNABLE_SET_WITH_BOUNDS(__top, __ns, __id, __val, __min, __max) \
+ TUNABLE_SET_WITH_BOUNDS_FULL (__top, __ns, __id, __val, __min, __max)
#endif
/* Get and return a tunable value. If the tunable was set externally and __CB
})
/* Set a tunable value. */
-# define TUNABLE_SET_FULL(__top, __ns, __id, __type, __val) \
+# define TUNABLE_SET_FULL(__top, __ns, __id, __val) \
+({ \
+ __tunable_set_val (TUNABLE_ENUM_NAME (__top, __ns, __id), \
+ & (tunable_val_t) {.numval = __val}, NULL, NULL); \
+})
+
+/* Set a tunable value together with min/max values. */
+# define TUNABLE_SET_WITH_BOUNDS_FULL(__top, __ns, __id,__val, __min, __max) \
({ \
__tunable_set_val (TUNABLE_ENUM_NAME (__top, __ns, __id), \
- & (__type) {__val}); \
+ & (tunable_val_t) {.numval = __val}, \
+ & (tunable_num_t) {__min}, \
+ & (tunable_num_t) {__max}); \
})
/* Namespace sanity for callback functions. Use this macro to keep the
/* The default value for TUNABLES_FRONTEND. */
# define TUNABLES_FRONTEND_yes TUNABLES_FRONTEND_valstring
+static __always_inline bool
+tunable_val_lt (tunable_num_t lhs, tunable_num_t rhs, bool unsigned_cmp)
+{
+ if (unsigned_cmp)
+ return (uintmax_t) lhs < (uintmax_t) rhs;
+ else
+ return lhs < rhs;
+}
+
+static __always_inline bool
+tunable_val_gt (tunable_num_t lhs, tunable_num_t rhs, bool unsigned_cmp)
+{
+ if (unsigned_cmp)
+ return (uintmax_t) lhs > (uintmax_t) rhs;
+ else
+ return lhs > rhs;
+}
+
/* Compare two name strings, bounded by the name hardcoded in glibc. */
-static inline bool
-__always_inline
+static __always_inline bool
tunable_is_name (const char *orig, const char *envname)
{
for (;*orig != '\0' && *envname != '\0'; envname++, orig++)
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