Unix IPC: Unix Sockets
25 Nov 2012Unix sockets talk locally on the machine. Their operation is very similar to standard socket operations (as they are the same in every way). This snippet will show you a server and client.
int s, s2, t, len;
struct sockaddr_un local, remote;
char str[100];
/* --- as a server --- */
/* create the socket to serve on */
s = socket(AF_UNIX, SOCK_STREAM, 0);
/* fill out the address struct to listen on */
local.sun_family = AF_UNIX;
strcpy(local.sun_path, SOCK_PATH);
unlink(local.sun_path);
len = strlen(local.sun_path) + sizeof(local.sun_family);
/* bind the socket to this name */
bind(s, (struct sockaddr *)&local, len);
/* listen on this socket */
listen(s, 5);
/* accept any incoming connection */
s2 = accept(s, (struct sockaddr *)&remote, &t));
/* receive some data */
n = recv(s2, str, 100, 0);
/* close the client */
close(s2);
/* --- as a client --- */
/* create a socket to connect on */
s = socket(AF_UNIX, SOCK_STREAM, 0);
/* fill out the address struct to connect to */
remote.sun_family = AF_UNIX;
strcpy(remote.sun_path, SOCK_PATH);
len = strlen(remote.sun_path) + sizeof(remote.sun_family);
/* connect on this socket */
connect(s, (struct sockaddr *)&remote, len);
/* send some data */
send(s, str, strlen(str), 0);
/* close the socket */
close(s);