Re: [tarantool-patches] Re: [PATCH 07/11] coio: fix file descriptor leak on accept

[Vladislav Shpilevoy <v.shpilevoy@tarantool.org>]

On 03/12/2018 19:16, Vladimir Davydov wrote:
> On Fri, Nov 30, 2018 at 06:39:39PM +0300, Vladislav Shpilevoy wrote:
>> @@ -90,44 +92,46 @@ evio_setsockopt_keepalive(int fd)
>>   	 */
>>   	int keepcnt = 5;
>>   	if (sio_setsockopt(fd, IPPROTO_TCP, TCP_KEEPCNT, &keepcnt,
>> -		       sizeof(int)))
>> -		diag_raise();
>> +			   sizeof(int)) != 0)
>> +		return -1;
>>   	int keepidle = 30;
>>   
>>   	if (sio_setsockopt(fd, IPPROTO_TCP, TCP_KEEPIDLE, &keepidle,
>> -		       sizeof(int)))
>> -		diag_raise();
>> +			   sizeof(int)) != 0)
>> +		return -1;
>>   
>>   	int keepintvl = 60;
>>   	if (sio_setsockopt(fd, IPPROTO_TCP, TCP_KEEPINTVL, &keepintvl,
>> -		       sizeof(int)))
>> -		diag_raise();
>> +			   sizeof(int)) != 0)
>> +		return -1;
>>   #endif
>> +	return 0;
>>   }
>>   
>>   /** Set common client socket options. */
>> -void
>> +int
>>   evio_setsockopt_client(int fd, int family, int type)
>>   {
>>   	int on = 1;
>> -	/* In case this throws, the socket is not leaked. */
>>   	if (sio_setfl(fd, O_NONBLOCK) != 0)
>> -		diag_raise();
>> +		return -1;
>>   	if (type == SOCK_STREAM && family != AF_UNIX) {
>>   		/*
>>   		 * SO_KEEPALIVE to ensure connections don't hang
>>   		 * around for too long when a link goes away.
>>   		 */
>> -		evio_setsockopt_keepalive(fd);
>> +		if (evio_setsockopt_keepalive(fd) != 0)
>> +			return -1;
>>   		/*
>>   		 * Lower latency is more important than higher
>>   		 * bandwidth, and we usually write entire
>>   		 * request/response in a single syscall.
>>   		 */
>>   		if (sio_setsockopt(fd, IPPROTO_TCP, TCP_NODELAY,
>> -				   &on, sizeof(on)))
>> -			diag_raise();
>> +				   &on, sizeof(on)) != 0)
>> +			return -1;
>>   	}
>> +	return 0;
>>   }
>>   
>>   /** Set options for server sockets. */
>> @@ -150,8 +154,9 @@ evio_setsockopt_server(int fd, int family, int type)
>>   	if (sio_setsockopt(fd, SOL_SOCKET, SO_LINGER,
>>   		       &linger, sizeof(linger)))
>>   		diag_raise();
>> -	if (type == SOCK_STREAM && family != AF_UNIX)
>> -		evio_setsockopt_keepalive(fd);
>> +	if (type == SOCK_STREAM && family != AF_UNIX &&
>> +	    evio_setsockopt_keepalive(fd) != 0)
>> +		diag_raise();
>>   }
> 
> I don't like this patch, because apart from fixing the leak, it also
> removes exceptions from some evio functions, but not all of them, e.g.
> evio_setsockopt_keepalive and evio_setsockopt_client are now exception
> free while evio_setsockopt_server is not. And then you have a separate
> patch that removes the rest of exception from evio.
> 
> Let's please first remove all exceptions from evio in one go, and only
> then fix the leak?
> 

Done. See v2.