diff options
Diffstat (limited to 'elf/dl-tunables.h')
| -rw-r--r-- | elf/dl-tunables.h | 53 |
1 files changed, 34 insertions, 19 deletions
diff --git a/elf/dl-tunables.h b/elf/dl-tunables.h index 20ee512..6c49dcb 100644 --- a/elf/dl-tunables.h +++ b/elf/dl-tunables.h @@ -39,8 +39,8 @@ struct _tunable const char *name; /* Internal name of the tunable. */ tunable_type_t type; /* Data type of the tunable. */ tunable_val_t val; /* The value. */ - const char *strval; /* The string containing the value, - points into envp. */ + 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 @@ -61,37 +61,52 @@ typedef struct _tunable tunable_t; /* Full name for a tunable is top_ns.tunable_ns.id. */ # define TUNABLE_NAME_S(top,ns,id) #top "." #ns "." #id -# define TUNABLE_ENUM_NAME(top,ns,id) TUNABLE_ENUM_NAME1 (top,ns,id) -# define TUNABLE_ENUM_NAME1(top,ns,id) top ## _ ## ns ## _ ## id +# define TUNABLE_ENUM_NAME(__top,__ns,__id) TUNABLE_ENUM_NAME1 (__top,__ns,__id) +# define TUNABLE_ENUM_NAME1(__top,__ns,__id) __top ## _ ## __ns ## _ ## __id # include "dl-tunable-list.h" extern void __tunables_init (char **); -extern void __tunable_set_val (tunable_id_t, void *, tunable_callback_t); - +extern void __tunable_get_val (tunable_id_t, void *, tunable_callback_t); +extern void __tunable_set_val (tunable_id_t, void *); rtld_hidden_proto (__tunables_init) -rtld_hidden_proto (__tunable_set_val) +rtld_hidden_proto (__tunable_get_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 + tunables within a module. */ +#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) +#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) +#endif -/* Check if the tunable has been set to a non-default value and if it is, copy - it over into __VAL. */ -# define TUNABLE_SET_VAL(__id,__val) \ +/* 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) \ ({ \ - __tunable_set_val \ - (TUNABLE_ENUM_NAME (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id), (__val), \ - NULL); \ + tunable_id_t id = TUNABLE_ENUM_NAME (__top, __ns, __id); \ + __type ret; \ + __tunable_get_val (id, &ret, __cb); \ + ret; \ }) -/* Same as TUNABLE_SET_VAL, but also call the callback function __CB. */ -# define TUNABLE_SET_VAL_WITH_CALLBACK(__id,__val,__cb) \ +/* Set a tunable value. */ +# define TUNABLE_SET_FULL(__top, __ns, __id, __type, __val) \ ({ \ - __tunable_set_val \ - (TUNABLE_ENUM_NAME (TOP_NAMESPACE, TUNABLE_NAMESPACE, __id), (__val), \ - DL_TUNABLE_CALLBACK (__cb)); \ + __tunable_set_val (TUNABLE_ENUM_NAME (__top, __ns, __id), \ + & (__type) {__val}); \ }) /* Namespace sanity for callback functions. Use this macro to keep the namespace of the modules clean. */ -# define DL_TUNABLE_CALLBACK(__name) _dl_tunable_ ## __name +# define TUNABLE_CALLBACK(__name) _dl_tunable_ ## __name # define TUNABLES_FRONTEND_valstring 1 /* The default value for TUNABLES_FRONTEND. */ |