From 84adefa331c4159d432d22840663c38f155cd4c1 Mon Sep 17 00:00:00 2001
From: Erlang/OTP <otp@erlang.org>
Date: Fri, 20 Nov 2009 14:54:40 +0000
Subject: The R13B03 release.

---
 lib/erl_interface/src/legacy/global_unregister.c | 102 +++++++++++++++++++++++
 1 file changed, 102 insertions(+)
 create mode 100644 lib/erl_interface/src/legacy/global_unregister.c

(limited to 'lib/erl_interface/src/legacy/global_unregister.c')

diff --git a/lib/erl_interface/src/legacy/global_unregister.c b/lib/erl_interface/src/legacy/global_unregister.c
new file mode 100644
index 0000000000..514dbc3c68
--- /dev/null
+++ b/lib/erl_interface/src/legacy/global_unregister.c
@@ -0,0 +1,102 @@
+/*
+ * %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 <string.h>
+#include "eidef.h"		/* Has to be first */
+#include "eiext.h"
+#include "eisend.h"
+#include "eirecv.h"
+#include "ei_connect_int.h"
+#include "erl_interface.h"
+#include "erl_connect.h"
+
+/* remove the association between name and its pid */
+/* global:unregister_name(name) -> ok */
+int erl_global_unregister(int fd, const char *name)
+{
+  char buf[EISMALLBUF];
+  char *bufp=buf;
+  char tmpbuf[64];
+  int index = 0;
+  erlang_pid *self = erl_self();
+  erlang_msg msg;
+  int i;
+  int version,arity,msglen;
+  int needunlink, needatom;
+
+  /* make a self pid */
+  self->num = fd;
+  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,"unregister_name_external");    /* 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 -1;
+
+  /* get the reply: expect unlink and an atom, or just an atom */
+  needunlink = needatom = 1;
+  while (1) {
+    /* get message */
+    while (1) {
+      index = EISMALLBUF;
+      if (!(i = ei_recv_internal(fd,&bufp,&index,&msg,&msglen,1,0))) continue;
+      else break;
+    }
+
+    switch (i) {
+    case ERL_UNLINK:
+      /* got link */
+      if (!needunlink) return -1;
+      needunlink = 0;
+      break;
+
+    case ERL_SEND:
+      /* got message - does it contain our atom? */
+      if (!needatom) return -1;
+      else {
+	/* expecting { rex, ok } */
+	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_atom(buf,&index,tmpbuf) 
+	    || strcmp(tmpbuf,"ok"))
+	  return -1; /* bad response from other side */
+
+	/* we're done here */
+	return 0;
+      }
+      break;
+
+    default:
+      return -1;
+    }
+  }
+
+  return 0;
+}
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