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-rw-r--r--lib/erl_interface/src/legacy/global_names.c109
1 files changed, 109 insertions, 0 deletions
diff --git a/lib/erl_interface/src/legacy/global_names.c b/lib/erl_interface/src/legacy/global_names.c
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+++ b/lib/erl_interface/src/legacy/global_names.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"
+
+#define GLOBALNAMEBUF (16*1024) /* not very small actually */
+
+/* return a list of all registered names. Function allocates and
+ * returns a NULL-terminated array of pointers to strings. The caller
+ * is responsible for freeing the array. Space for the array and
+ * all strings is allocated with a single call to malloc, so the
+ * caller can make one call to free().
+ */
+/* global:registered_names() -> [name1,name2,...] */
+char **erl_global_names(int fd, int *count)
+{
+ char buf[GLOBALNAMEBUF];
+ char *bufp=buf;
+ char tmpbuf[64];
+ int size = 0;
+ int index = 0;
+ erlang_pid *self = erl_self();
+ erlang_msg msg;
+ int i;
+ int version;
+ int arity;
+ int msglen;
+ char **names;
+ char *s;
+
+ 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,"registered_names"); /* Fun */
+ ei_encode_list_header(buf,&index,0); /* Args: [ ] */
+ 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 = GLOBALNAMEBUF;
+ if (!(i = ei_recv_internal(fd,&bufp,&index,&msg,&msglen,1,0))) continue;
+ else break;
+ }
+
+ if (i != ERL_SEND) return NULL;
+
+ /* expecting { rex, [name1, name2, ...] } */
+ size = msglen;
+ 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_list_header(buf,&index,&arity)) return NULL;
+
+
+ /* we use the size of the rest of the received message to estimate
+ * the buffer space required for all the strings. we know how many
+ * they are (arity) so we need space for that many pointers, plus
+ * a little less than the atoms themselves needed in the reply.
+ */
+ arity++; /* we will need a terminating NULL as well */
+ if (!(names = malloc((arity * sizeof(char**)) + (size-index)))) return NULL;
+
+ /* arity pointers first, followed by s */
+ s = (char *)(names+arity+1);
+
+ if (count) *count = 0;
+ for (i=0; i<arity; i++) {
+ names[i] = s; /* insert the pointer */
+ if (ei_decode_atom(buf,&index,s)) break; /* copy the data */
+ if (count) (*count)++;
+ s += strlen(names[i]) + 1; /* advance pointer */
+ }
+ names[i]=NULL;
+
+ return names;
+}