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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-10-27 00:07:10 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-10-27 09:23:31 -0300 |
| commit | 51da90c20d54c5098d9e1b01950a43bd2197813d (patch) | |
| tree | 1e034bd07d5cc765b370577af03944c5119fb793 | |
| parent | 2869a2eb9669e8cc1cd019805c419d11e5f3a1d3 (diff) | |
| download | glibc-51da90c20d54c5098d9e1b01950a43bd2197813d.tar.gz glibc-51da90c20d54c5098d9e1b01950a43bd2197813d.tar.xz glibc-51da90c20d54c5098d9e1b01950a43bd2197813d.zip | |
elf: Add a way to check if tunable is set (BZ 27069)
The tunable already keep a field whether it is initialized. Add the TUNABLE_IS_INITIALIZED to query it. Checked on x86_64-linux-gnu.
| -rw-r--r-- | elf/dl-tunables.c | 7 | ||||
| -rw-r--r-- | elf/dl-tunables.h | 12 |
2 files changed, 19 insertions, 0 deletions
diff --git a/elf/dl-tunables.c b/elf/dl-tunables.c index cae67efa0a..fb40d3138a 100644 --- a/elf/dl-tunables.c +++ b/elf/dl-tunables.c @@ -145,6 +145,13 @@ tunable_initialize (tunable_t *cur, const char *strval) do_tunable_update_val (cur, &val, NULL, NULL); } +bool +__tunable_is_initialized (tunable_id_t id) +{ + return tunable_list[id].initialized; +} +rtld_hidden_def (__tunable_is_initialized) + void __tunable_set_val (tunable_id_t id, tunable_val_t *valp, tunable_num_t *minp, tunable_num_t *maxp) diff --git a/elf/dl-tunables.h b/elf/dl-tunables.h index 45c191e021..4187ffc525 100644 --- a/elf/dl-tunables.h +++ b/elf/dl-tunables.h @@ -45,11 +45,13 @@ typedef void (*tunable_callback_t) (tunable_val_t *); extern void __tunables_init (char **); extern void __tunables_print (void); +extern bool __tunable_is_initialized (tunable_id_t); extern void __tunable_get_val (tunable_id_t, void *, tunable_callback_t); 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_is_initialized) rtld_hidden_proto (__tunable_get_val) rtld_hidden_proto (__tunable_set_val) @@ -57,6 +59,8 @@ rtld_hidden_proto (__tunable_set_val) TUNABLE_NAMESPACE are defined. This is useful shorthand to get and set tunables within a module. */ #if defined TOP_NAMESPACE && defined TUNABLE_NAMESPACE +# define TUNABLE_IS_INITIALIZED(__id) \ + TUNABLE_IS_INITIALIZED_FULL(TOP_NAMESPACE, TUNABLE_NAMESPACE, __id) # define TUNABLE_GET(__id, __type, __cb) \ TUNABLE_GET_FULL (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id, __type, __cb) # define TUNABLE_SET(__id, __val) \ @@ -65,6 +69,8 @@ rtld_hidden_proto (__tunable_set_val) TUNABLE_SET_WITH_BOUNDS_FULL (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id, \ __val, __min, __max) #else +# define TUNABLE_IS_INITIALIZED(__top, __ns, __id) \ + TUNABLE_IS_INITIALIZED_FULL(__top, __ns, __id) # define TUNABLE_GET(__top, __ns, __id, __type, __cb) \ TUNABLE_GET_FULL (__top, __ns, __id, __type, __cb) # define TUNABLE_SET(__top, __ns, __id, __val) \ @@ -73,6 +79,12 @@ rtld_hidden_proto (__tunable_set_val) TUNABLE_SET_WITH_BOUNDS_FULL (__top, __ns, __id, __val, __min, __max) #endif +#define TUNABLE_IS_INITIALIZED_FULL(__top, __ns, __id) \ +({ \ + tunable_id_t id = TUNABLE_ENUM_NAME (__top, __ns, __id); \ + __tunable_is_initialized (id); \ +}) + /* Get and return a tunable value. If the tunable was set externally and __CB is defined then call __CB before returning the value. */ #define TUNABLE_GET_FULL(__top, __ns, __id, __type, __cb) \ |