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authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /lib/erl_interface/src/legacy/global_unregister.c
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The R13B03 release.OTP_R13B03
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-rw-r--r--lib/erl_interface/src/legacy/global_unregister.c102
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diff --git a/lib/erl_interface/src/legacy/global_unregister.c b/lib/erl_interface/src/legacy/global_unregister.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 <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;
+}