Struct solana_rbpf::syscalls::BpfRand

pub struct BpfRand {}

Returns a random u64 value comprised between min and max values (inclusive). Arguments 3 to 5 are unused.

Relies on rand() function from libc, so libc::srand() should be called once before this syscall is used.

Examples

extern crate libc;
extern crate solana_rbpf;
extern crate time;

use solana_rbpf::syscalls::{BpfRand, Result};
use solana_rbpf::memory_region::{MemoryRegion, MemoryMapping};
use solana_rbpf::vm::{Config, SyscallObject};
use solana_rbpf::user_error::UserError;

unsafe {
    libc::srand(time::precise_time_ns() as u32)
}

let mut result: Result = Ok(0);
let config = Config::default();
let memory_mapping = MemoryMapping::new::<UserError>(vec![MemoryRegion::default()], &config).unwrap();
BpfRand::call(&mut BpfRand {}, 3, 6, 0, 0, 0, &memory_mapping, &mut result);
let n = result.unwrap();
assert!(3 <= n && n <= 6);

Trait Implementations

impl SyscallObject<UserError> for BpfRand

fn call(
    &mut self,
    min: u64,
    max: u64,
    _arg3: u64,
    _arg4: u64,
    _arg5: u64,
    _memory_mapping: &MemoryMapping<'_>,
    result: &mut Result
)

Call the syscall function