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;
}
/* 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, needdemonitor;
/* 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 = needdemonitor = 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 unlink */
if (!needunlink) return -1;
needunlink = 0;
break;
case ERL_DEMONITOR_P-10:
/* got demonitor */
if (!needdemonitor) return -1;
needdemonitor = 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;
}
