Add ercp_connect() call to ERCP interface

This is used by sesman to connect to sockets in the restart
directory.

libipm/ercp.c

@@ -81,6 +81,32 @@ ercp_trans_from_eicp_trans(struct trans *trans,
 
 /*****************************************************************************/
 
+struct trans *
+ercp_connect(const  char *port, int (*term_func)(void))
+{
+    struct trans *t;
+
+    if ((t = trans_create(TRANS_MODE_UNIX, 128, 128)) != NULL)
+    {
+        t->is_term = term_func;
+
+        if (trans_connect(t, NULL, port, 3000) != 0)
+        {
+            trans_delete(t);
+            t = NULL;
+        }
+        else if (ercp_init_trans(t) != 0)
+        {
+            trans_delete(t);
+            t = NULL;
+        }
+    }
+
+    return t;
+}
+
+/*****************************************************************************/
+
 int
 ercp_msg_in_check_available(struct trans *trans, int *available)
 {

libipm/ercp.h

@@ -88,6 +88,16 @@ ercp_trans_from_eicp_trans(struct trans *trans,
                            ttrans_data_in callback_func,
                            void *callback_data);
 
+/**
+ * Connects to an ERCP endpoint.
+ *
+ * @param port Path to UDS object in filesystem
+ * @param term_func Function to poll during connection for program
+ *         termination, or NULL for none.
+ */
+struct trans *
+ercp_connect(const char *port,
+             int (*term_func)(void));
 
 /**
  * Checks an ERCP transport to see if a complete message is