Out of gas in subcontract

Question

If I send ether from contractB to contractA, then get error "out of gas".

Increase the amount of gas does not help.

In "VM Trace Transaction" http://testnet.etherscan.io/vmtrace?txhash=0x24269877942122ea5e022833e2dbd80f543458be2195ad2df222387cff7f5382 I see, then call "contractA.send(msg.value);" don't send gas to subcontract.

How to make these contracts work?

contract contractA {
    function() {
        for(uint i = 0;i<10; ++i)
            msg.sender.send(msg.value/10);
    }
}

contract contractB
{
    address contractA = 0x2EA16ad451ca2aA32E06f476691D1529cF11BaC7; // TestNet!!!
    function() {
        if (msg.sender != contractA) {
            contractA.send(msg.value);
        }
    }
}

Tjaden Hess · Accepted Answer · 2016-06-24T15:46:46.383

4

You need to add gas to the transaction by calling msg.sender.call.gas(10000).value(msg.value/10)().

Be Careful: this could be vulnerable to recursive call attacks. In your case it isn't, but just be aware when sending gas to unknown contracts.

edited Jun 24 '16 at 15:46

answered Jun 24 '16 at 13:19

Tjaden Hess

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Where can I read the documentation for this command? Maybe contractA.call.gas(10000).value(msg.value)? – SkyN Jun 24 '16 at 15:45
http://solidity.readthedocs.io/en/latest/types.html#address – Tjaden Hess Jun 24 '16 at 15:46
And yes, for the call to contractA that would be correct, except you're missing the parentheses at the end. – Tjaden Hess Jun 24 '16 at 15:48
call returns a boolean :) – SkyN Jun 24 '16 at 15:50

Out of gas in subcontract

1 Answers1