unbound
0.1
|
Thread safe random functions. More...
Functions | |
void | ub_systemseed (unsigned int seed) |
Initialize the system randomness. More... | |
struct ub_randstate * | ub_initstate (unsigned int seed, struct ub_randstate *from) |
Initialize a random generator state for use. More... | |
long int | ub_random (struct ub_randstate *state) |
Generate next random number from the state passed along. More... | |
long int | ub_random_max (struct ub_randstate *state, long int x) |
Generate random number between 0 and x-1. More... | |
void | ub_randfree (struct ub_randstate *state) |
Delete the random state. More... | |
Thread safe random functions.
Similar to arc4random() with an explicit initialisation routine.
void ub_systemseed | ( | unsigned int | seed | ) |
Initialize the system randomness.
Obtains entropy from the system before a chroot or privilege makes it unavailable. You do not have to call this, otherwise ub_initstate does so.
seed | seed value to create state (if no good entropy is found). |
struct ub_randstate* ub_initstate | ( | unsigned int | seed, |
struct ub_randstate * | from | ||
) |
Initialize a random generator state for use.
seed | seed value to create state contents. (ignored for arc4random). |
from | if not NULL, the seed is taken from this random structure. can be used to seed random states via a parent-random-state that is itself seeded with entropy. |
Referenced by daemon_create_workers(), libworker_setup(), rnd_test(), ub_ctx_create_nopipe(), and worker_create().
long int ub_random | ( | struct ub_randstate * | state | ) |
Generate next random number from the state passed along.
Thread safe, so random numbers are repeatable.
state | must have been initialised with ub_initstate. |
Referenced by libworker_setup(), pending_tcp_query(), rnd_test(), select_id(), and serviced_perturb_qname().
long int ub_random_max | ( | struct ub_randstate * | state, |
long int | x | ||
) |
Generate random number between 0 and x-1.
No modulo bias.
state | must have been initialised with ub_initstate. |
x | an upper limit. not (negative or zero). must be smaller than 2**31. |
Referenced by calc_next_probe(), iter_ns_probability(), iter_server_selection(), pick_outgoing_tcp(), rnd_test(), and select_ifport().
void ub_randfree | ( | struct ub_randstate * | state | ) |
Delete the random state.
state | to delete. |
Referenced by daemon_delete(), libworker_delete_env(), rnd_test(), ub_ctx_create(), ub_ctx_create_nopipe(), and ub_ctx_delete().