The R13B03 release.OTP_R13B03

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
new file mode 100644
index 0000000000..7333d94931
--- /dev/null
+++ b/lib/erl_interface/src/legacy/global_names.c
@@ -0,0 +1,109 @@
+/*
+ * %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;
+}