solana/sdk/cargo-build-bpf/tests/crates/noop/src/lib.rs

//! Example Rust-based BPF noop program

extern crate solana_program;
use solana_program::{
    account_info::AccountInfo, entrypoint, entrypoint::ProgramResult, pubkey::Pubkey,
};

entrypoint!(process_instruction);
fn process_instruction(
    _program_id: &Pubkey,
    _accounts: &[AccountInfo],
    _instruction_data: &[u8],
) -> ProgramResult {
    Ok(())
}