Programming with Rudiments using the unixsocketserver class

Daemons are commonly used to serve data to clients over a network but they can also be used to serve data to processes running on the local machine. This can be done using the inetsocketserver class but if your platform supports unix sockets, then it can be done much faster and more efficiently using the unixsocketserver class. The example below listens on a unix socket for a client connection, receives a string from the client, and writes a response back.

#include <rudiments/unixsocketserver.h>
#include <rudiments/charstring.h>
#include <rudiments/permissions.h>
#include <rudiments/stdio.h>

int main(int argc, const char **argv) {

	// create a server socket and listen on a unix socket file
	unixsocketserver	server;
	if (!server.listen("/tmp/testsocket",0,15)) {
		stdoutput.write("failed to listen on /tmp/testsocket\n");
		return 1;
	}
	stdoutput.write("listening on /tmp/testsocket...\n");


	// accept a client connection
	filedescriptor	*clientsock=server.accept();
	if (!clientsock) {
		stdoutput.write("failed to accept connection\n");
		return 1;
	}
	stdoutput.write("accepted a connection\n");


	// read a message from the client
	char	buf[1024];
	ssize_t	bytesread=clientsock->read(buf,sizeof(buf)-1);
	if (bytesread>0) {
		buf[bytesread]='\0';
		stdoutput.printf("received: %s\n",buf);
	}


	// send a response back to the client
	const char	*response="hello from the unix server";
	clientsock->write(response,charstring::getLength(response));
	stdoutput.write("sent response\n");


	// close and clean up
	delete clientsock;
	server.close();
}

See the unixsocketclient example for a client that can communicate with this server.

Copyright 2017 - David Muse - Contact