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-rw-r--r--lib/erl_interface/src/legacy/global_whereis.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/lib/erl_interface/src/legacy/global_whereis.c b/lib/erl_interface/src/legacy/global_whereis.c
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+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 1998-2009. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+#include <stdlib.h>
+#include <string.h>
+#include "eidef.h"
+#include "eiext.h"
+#include "eisend.h"
+#include "eirecv.h"
+#include "ei_connect_int.h"
+#include "erl_interface.h"
+#include "erl_connect.h"
+
+/* return the ETERM pid corresponding to name. If caller
+ * provides non-NULL node, nodename will be returned there
+ */
+/* global:whereis_name(name) -> pid */
+
+ETERM *erl_global_whereis(int fd, const char *name, char *node)
+{
+ char buf[EISMALLBUF];
+ char *bufp=buf;
+ char tmpbuf[64];
+ int index = 0;
+ erlang_pid *self = erl_self();
+ erlang_pid epid;
+ ETERM *opid;
+ erlang_msg msg;
+ int i;
+ int version,arity,msglen;
+
+ self->num = fd; /* FIXME looks strange to change something?! */
+
+ ei_encode_version(buf,&index);
+ ei_encode_tuple_header(buf,&index,2);
+ ei_encode_pid(buf,&index,self); /* PidFrom */
+ ei_encode_tuple_header(buf,&index,5);
+ ei_encode_atom(buf,&index,"call"); /* call */
+ ei_encode_atom(buf,&index,"global"); /* Mod */
+ ei_encode_atom(buf,&index,"whereis_name"); /* Fun */
+ ei_encode_list_header(buf,&index,1); /* Args: [ name ] */
+ ei_encode_atom(buf,&index,name);
+ ei_encode_empty_list(buf,&index);
+ ei_encode_atom(buf,&index,"user"); /* user */
+
+ /* make the rpc call */
+ if (ei_send_reg_encoded(fd,self,"rex",buf,index)) return NULL;
+
+ while (1) {
+ index = EISMALLBUF;
+ if (!(i = ei_recv_internal(fd,&bufp,&index,&msg,&msglen,1,0))) continue;
+ else break;
+ }
+
+ if (i != ERL_SEND) return NULL;
+
+ /* expecting { rex, pid } */
+ index = 0;
+ if (ei_decode_version(buf,&index,&version)
+ || ei_decode_tuple_header(buf,&index,&arity)
+ || (arity != 2)
+ || ei_decode_atom(buf,&index,tmpbuf)
+ || strcmp(tmpbuf,"rex")
+ || ei_decode_pid(buf,&index,&epid))
+ return NULL; /* bad response from other side */
+
+ /* put the pid into a format for the caller */
+ index = 0;
+ ei_encode_pid(buf,&index,&epid);
+ opid = erl_decode((unsigned char*)buf);
+
+ /* extract the nodename for the caller */
+ if (node) strcpy(node,epid.node);
+
+ return opid;
+}