1 files changed, 99 insertions, 0 deletions
diff --git a/system/doc/tutorial/cnode_s.c b/system/doc/tutorial/cnode_s.c
new file mode 100644
index 0000000000..f79d096ced
--- /dev/null
+++ b/system/doc/tutorial/cnode_s.c
@@ -0,0 +1,99 @@
+/* cnode_s.c */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include "erl_interface.h"
+#include "ei.h"
+
+#define BUFSIZE 1000
+
+int main(int argc, char **argv) {
+  int port;                                /* Listen port number */
+  int listen;                              /* Listen socket */
+  int fd;                                  /* fd to Erlang node */
+  ErlConnect conn;                         /* Connection data */
+
+  int loop = 1;                            /* Loop flag */
+  int got;                                 /* Result of receive */
+  unsigned char buf[BUFSIZE];              /* Buffer for incoming message */
+  ErlMessage emsg;                         /* Incoming message */
+
+  ETERM *fromp, *tuplep, *fnp, *argp, *resp;
+  int res;
+
+  port = atoi(argv[1]);
+
+  erl_init(NULL, 0);
+
+  if (erl_connect_init(1, "secretcookie", 0) == -1)
+    erl_err_quit("erl_connect_init");
+
+  /* Make a listen socket */
+  if ((listen = my_listen(port)) <= 0)
+    erl_err_quit("my_listen");
+
+  if (erl_publish(port) == -1)
+    erl_err_quit("erl_publish");
+
+  if ((fd = erl_accept(listen, &conn)) == ERL_ERROR)
+    erl_err_quit("erl_accept");
+  fprintf(stderr, "Connected to %s\n\r", conn.nodename);
+
+  while (loop) {
+
+    got = erl_receive_msg(fd, buf, BUFSIZE, &emsg);
+    if (got == ERL_TICK) {
+      /* ignore */
+    } else if (got == ERL_ERROR) {
+      loop = 0;
+    } else {
+
+      if (emsg.type == ERL_REG_SEND) {
+	fromp = erl_element(2, emsg.msg);
+	tuplep = erl_element(3, emsg.msg);
+	fnp = erl_element(1, tuplep);
+	argp = erl_element(2, tuplep);
+
+	if (strncmp(ERL_ATOM_PTR(fnp), "foo", 3) == 0) {
+	  res = foo(ERL_INT_VALUE(argp));
+	} else if (strncmp(ERL_ATOM_PTR(fnp), "bar", 3) == 0) {
+	  res = bar(ERL_INT_VALUE(argp));
+	}
+
+	resp = erl_format("{cnode, ~i}", res);
+	erl_send(fd, fromp, resp);
+
+	erl_free_term(emsg.from); erl_free_term(emsg.msg);
+	erl_free_term(fromp); erl_free_term(tuplep);
+	erl_free_term(fnp); erl_free_term(argp);
+	erl_free_term(resp);
+      }
+    }
+  } /* while */
+}
+
+  
+int my_listen(int port) {
+  int listen_fd;
+  struct sockaddr_in addr;
+  int on = 1;
+
+  if ((listen_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
+    return (-1);
+
+  setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+
+  memset((void*) &addr, 0, (size_t) sizeof(addr));
+  addr.sin_family = AF_INET;
+  addr.sin_port = htons(port);
+  addr.sin_addr.s_addr = htonl(INADDR_ANY);
+
+  if (bind(listen_fd, (struct sockaddr*) &addr, sizeof(addr)) < 0)
+    return (-1);
+
+  listen(listen_fd, 5);
+  return listen_fd;
+}