Add bool return to entrypoint signature to permit programs to fail transactions

programs/native/move_funds/src/lib.rs

@@ -5,16 +5,18 @@ use bincode::deserialize;
 use solana_program_interface::account::KeyedAccount;
 
 #[no_mangle]
-pub extern "C" fn process(infos: &mut Vec<KeyedAccount>, data: &[u8]) {
+pub extern "C" fn process(infos: &mut Vec<KeyedAccount>, data: &[u8]) -> bool {
     let tokens: i64 = deserialize(data).unwrap();
     if infos[0].account.tokens >= tokens {
         infos[0].account.tokens -= tokens;
         infos[1].account.tokens += tokens;
+        true
     } else {
         println!(
             "Insufficient funds, asked {}, only had {}",
             tokens, infos[0].account.tokens
         );
+        false
     }
 }
 

programs/native/noop/src/lib.rs

@@ -3,7 +3,8 @@ extern crate solana_program_interface;
 use solana_program_interface::account::KeyedAccount;
 
 #[no_mangle]
-pub extern "C" fn process(infos: &mut Vec<KeyedAccount>, data: &[u8]) {
+pub extern "C" fn process(infos: &mut Vec<KeyedAccount>, data: &[u8]) -> bool {
     println!("noop: AccountInfos: {:#?}", infos);
     println!("noop: data: {:#?}", data);
+    true
 }

programs/native/solua/src/lib.rs

@@ -45,10 +45,11 @@ fn run_lua(keyed_accounts: &mut Vec<KeyedAccount>, code: &str, data: &[u8]) -> R
 }
 
 #[no_mangle]
-pub extern "C" fn process(keyed_accounts: &mut Vec<KeyedAccount>, data: &[u8]) {
+pub extern "C" fn process(keyed_accounts: &mut Vec<KeyedAccount>, data: &[u8]) -> bool {
     let code_data = keyed_accounts[0].account.userdata.clone();
     let code = str::from_utf8(&code_data).unwrap();
     run_lua(keyed_accounts, &code, data).unwrap();
+    true
 }
 
 #[cfg(test)]