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/*
Copyright (C) 1994 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
struct rpc_list
{
struct rpc_list *next, **prevp;
void *rpc;
size_t rpc_len;
void *reply;
size_t reply_buflen;
size_t reply_len;
int reply_received;
};
static struct rpc_list *outstanding_rpcs;
static struct mutex outstanding_lock = MUTEX_INITIALIZER;
static struct condition rpc_wakeup = CONDITION_INITIALIZER;
/* Send an RPC message to target TARGET from buffer BUF of size
LEN, waiting for a reply. The expected reply length is
REPLY_LEN; a buffer that big is provided as REPLY_BUF.
Set REPLY_CONTENTS to the actual protocol-level reply, of
size REPLY_CONTENTS_LEN. AUTH is the authentication used
in constructing BUF.*/
error_t
rpc_send (struct rpc_target *target, void *buf, size_t len,
void *reply_buf, size_t reply_len, void **reply_contents,
size_t *reply_contents_len, struct rpc_auth *auth)
{
struct rpc_list record;
struct rpcv2_msg_hdr *reply;
struct rpcv2_msg_hdr *request;
struct rpcv2_accepted_reply *accept;
struct rpcv2_rejected_reply *reject;
struct rpcv2_auth *authdata;
struct rpcv2_verf *verf;
error_t error;
mutex_lock (&outstanding_lock);
record.rpc = request = buf;
record.len = len;
record.reply = reply_buf;
record.reply_len = reply_len;
record.reply_received = 0;
record.next = outstanding_rpcs;
if (record.next)
record.next->prevp = &record.next;
outstanding_rpcs = &record;
record.prevp = &outstanding_rpcs;
rpc_transmit (target, &record);
while (!record.reply_received)
condition_wait (&rpc_wakeup, &outstanding_lock);
/* Examine the reply to see whether any RPC level errors have happened. */
reply = record.reply;
assert (reply->xid == request->xid);
assert (reply->mtype == RPCV2_REPLY);
if (reply->body.reply.reply_state == RPCV2_MSG_ACCEPTED)
{
/* Ignore VERF */
verf = &reply->body.reply.rest;
accept = (void *)verf + sizeof (struct rpcv2_verf) + verf->nbytes;
/* The message was accepted; return the appropriate error
(or success) to the caller. */
if (accept->stat == RPCV2_SUCCESS)
{
/* Ah hah! Return to the user */
*reply_contents = &accept->reply_data.results;
*reply_contents_len = record.reply_len;
*reply_contents_len -= ((void *)&accept->reply_data.result
- (void *) reply);
error = 0;
}
else
error = EOPNOTSUPP;
}
else if (reply->body.reply.reply_state == RPCV2_MSG_DENIED)
{
/* For some reason we didn't win. */
reject = &reply->body.reply.rest;
if (reject->stat == RPCV2_RPC_MISMATCH)
error = EOPNOTSUPP;
else if (reject->stat == RPCV2_AUTH_ERROR)
error = EACCES;
else
error = EIEIO;
}
else
error = EIEIO;
*record.prevp = record.next;
if (record.next)
record.next->prevp = record.prevp;
mutex_unlock (&outstanding_lock);
return error;
}
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