It seems to me that you should construct the unique ID corresponding to your requirements. This ID can be constructed as a hash (like MD5, SHA1 or SHA512) from the information which is important for you (some information about software and hardware component). You can make your solution more secure if you sign such hash … Read more
It’s easy to share named POSIX semaphores Choose a name for your semaphore #define SNAME “/mysem” Use sem_open with O_CREAT in the process that creates them sem_t *sem = sem_open(SNAME, O_CREAT, 0644, 3); /* Initial value is 3. */ Open semaphores in the other processes sem_t *sem = sem_open(SEM_NAME, 0); /* Open a preexisting semaphore. … Read more
To view the message contents you must add a source for System.ServiceModel.MessageLogging in your configuration file. The message tab in the Trace Viewer will show the full message for a particular service call. Here is a sample configuration file: <configuration> … <system.diagnostics> <sources> <source name=”System.ServiceModel” switchValue=”All” propagateActivity=”true”> <listeners> <add name=”traceListener” /> </listeners> </source> <source name=”System.ServiceModel.MessageLogging” … Read more
“struct sockaddr” is a generic definition. It’s used by any socket function that requires an address. “struct sockaddr_un” (a “Unix sockets” address) is a specific kind of address family. The more commonly seen “struct sockaddr_in” (an “Internet socket” address) is another specific kind of address family. The cast is what allows the sockets APIs to … Read more
I’ve used Beej’s Guide to Network Programming in the past. It’s in C, not C++, but the examples are good. Go directly to section 6 for the simple client and server example programs.
Archie1986’s answer was good but has become outdated with socketio updates (more specifically, its protocol : https://github.com/LearnBoost/socket.io-spec)… as far as i can tell, you need to perform the handshake manually before you can ask for a transport (e.g., websockets) connection… note that the code below is incomplete and insecure… for one, it ignores the list … Read more
The new socket is an application-level concept introduced because each established connection needs a unique file descriptor (also distinct from the listening file descriptor), which maps to, but isn’t the same as, a TCP session. The session itself is identified by the combination of source and destination address and port. The source (client) port is … Read more
Couple of considerations for choosing one big vs several small: In the single request case, you can’t do progressive data processing as the data arrives; you need to wait for the full packet to arrive before you can do anything. If it fails, you need to start everything from scratch. In the multiple requests case, … Read more
If a class does not explicitly define a private static final long serialVersionUID in the code it will be autogenerated, and there is no guarantee that different machines will generate the same id; it looks like that is exactly what happened. Also if the classes are different in any way (using different versions of the … Read more
It’s kinda like: +——————————————————-+ | client network server | +—————–+ +——————–| | (connect) | —- SYN —-> | | | | <– SYN,ACK — | (accepted) | | (connected) | —- ACK —-> | | \_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/ when client sends… \_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/\_/ | | | | | (send) | —- data —> | | | | <—- … Read more