rvbugs0 To what port number should be bind the server to ?
repentant Loopback address(127.0.0.1)
sanketkadarkar I think it is only IP, what is the port number?
xenomacx Can you provide some helper functions for Java as for C/C++?
williampinho I've solved this problem in Java. Please have a look at
Another thing: don't try to write everything at once to the output. Write to the output stream the same quantity of bytes that is being read from the input stream.
sebdas Thanks for your helpful hints. The link you posted seems to be broken, but the project is accessible through https://github.com/kohlschutter/junixsocket.
kumaranSR4 Answer:
Python
def write_string_to_socket(connection, message): connection.send(message)
def read_string_from_socket(connection): return connection.recv(1024)
def process_client_connection(connection):
while True: # read message message = read_string_from_socket(connection) print "Message received = ", message sys.stdout.flush() if message == "END": break write_string_to_socket(connection, message)
matteoolivi7 "This challenge tests your understanding of Sockets and Multi-Threaded programming"
If you choose to use C, the only thing you have to do is add the logic to the function
void * process_client_connection(void * ptr)
which will be executed by the threads created when a connection is received. It doesn't really involve any Multi-Threaded programming since you never access variables that could be shared between threads. Or am I missing something?
jklebes Python: I had difficulty understanding what it wants me to do.
It simply wants you to define the methods read_string_from_socket, write_string_to_socket to call the appropriate methods on the socket. The socket is created, bound, etc for you and is passed to you as 'connection'.
The same thing (socket.send(), socket.recv(size)) works in Python 2 but not Python 3 - can someone tell me what has changed?
Smaheshwari I'm doing this in C++14
I get following error on client
Traceback (most recent call last): File "/custom-lA6iT6IrH3LpFHyXDtxY/solution.py", line 66, in <module> readThread.start() File "/usr/lib/python2.7/threading.py", line 745, in start _start_new_thread(self.__bootstrap, ()) thread.error: can't start new thread
When I read string from socket in server I do not get any string. What I might be doing wrong? Could any of you who did in C/C++ share me your solution? Thanks.
kj20009 Completed the challenge in c++.
It should be noted that all the messages from the clients have header - an unsigned int denoting the length (4byte) of each message and a tail - single char '/r' (0x13).
No multithreading is needed.
jbrewer Simplely creating a write_string_to_socket call seems to pass the test without regard to multithreading in C++.
I'm pretty sure this isn't the answer they want, but I'm not sure what the correct answer would look like.
kyte1021 I wanted to mention that it's actually already using pthreads for you in the C++ version. Look at the function layout and the thread exit at the bottom. Without seeing all the code that it doesn't show you it can be confusing!
enzeart I'm getting nothing from STDIN for the java setup, can't figure out what I'm doing wrong
rodrigoijk Same here. This is not printing anything:
Scanner sc = new Scanner(System.in); while(sc.hasNext()) { System.out.println(sc.next()); }
williampinho Try to read from the socket. Example:
Socket socket = server.accept(); InputStream is = socket.getInputStream(); byte[] buf = new byte[10000]; int read; while ((read = is.read(buf)) != -1) { // do something with buf here }Don't forget that part of this code must be in the implementation of the thread.
ufoscout This problem cannot be resolved in Java as there is no support for UDS. The only way could be through JNI but the complexity would be by far higher the supposed one.
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