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/*
* Copyright (c) 2006-2026, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include "af_unix_internal.h"
int af_unix_dgram_connect(struct af_unix_socket *sock,
const struct sockaddr *address, socklen_t length)
{
int result = 0;
struct sockaddr_un peer_address;
socklen_t peer_length;
struct af_unix_socket *peer;
peer = af_unix_namespace_lookup(address, length, SOCK_DGRAM,
&peer_address, &peer_length);
if (peer == RT_NULL)
{
return -1;
}
af_unix_lock();
if (sock->closed)
{
result = af_unix_error(EBADF);
}
else if (sock->write_shutdown)
{
result = af_unix_error(EPIPE);
}
else
{
af_unix_set_peer_locked(sock, peer);
sock->peer_address = peer_address;
sock->peer_length = peer_length;
sock->connected = 1;
}
af_unix_unlock();
af_unix_socket_put(peer);
return result;
}
static struct af_unix_socket *af_unix_dgram_target_get(
struct af_unix_socket *sock, const struct sockaddr *to,
socklen_t to_length)
{
struct af_unix_socket *peer = RT_NULL;
if (to != RT_NULL)
{
return af_unix_namespace_lookup(to, to_length, SOCK_DGRAM,
RT_NULL, RT_NULL);
}
af_unix_lock();
if (sock->connected && sock->peer != RT_NULL)
{
peer = sock->peer;
af_unix_socket_ref_locked(peer);
}
af_unix_unlock();
if (peer == RT_NULL)
{
af_unix_error(EDESTADDRREQ);
}
return peer;
}
int af_unix_dgram_send(struct af_unix_socket *sock, const void *data,
size_t size, int flags, const struct sockaddr *to,
socklen_t to_length, struct af_unix_rights *rights)
{
int error;
int result;
int nonblocking;
int timeout;
struct af_unix_socket *peer;
struct af_unix_message *message;
if (size > AF_UNIX_DGRAM_MAX_SIZE)
{
return af_unix_error(EMSGSIZE);
}
if (size != 0 && data == RT_NULL)
{
return af_unix_error(EINVAL);
}
peer = af_unix_dgram_target_get(sock, to, to_length);
if (peer == RT_NULL)
{
return -1;
}
message = (struct af_unix_message *)rt_malloc(sizeof(*message) + size);
if (message == RT_NULL)
{
af_unix_socket_put(peer);
return af_unix_error(ENOMEM);
}
rt_list_init(&message->node);
message->length = size;
message->rights = rights;
if (size != 0)
{
rt_memcpy(message->data, data, size);
}
for (;;)
{
af_unix_lock();
if (sock->closed)
{
result = af_unix_error(EBADF);
af_unix_unlock();
break;
}
if (sock->write_shutdown)
{
result = af_unix_error(EPIPE);
af_unix_unlock();
break;
}
if (peer->closed)
{
result = af_unix_error(ECONNREFUSED);
af_unix_unlock();
break;
}
if (peer->read_shutdown)
{
result = af_unix_error(EPIPE);
af_unix_unlock();
break;
}
if (peer->message_count < AF_UNIX_DGRAM_QUEUE_LEN)
{
message->source = sock->local_address;
message->source_length = sock->local_length;
rt_list_insert_before(&peer->message_queue, &message->node);
peer->message_count++;
rt_wqueue_wakeup_all(&peer->wait_queue,
(void *)(rt_ubase_t)POLLIN);
af_unix_unlock();
af_unix_socket_put(peer);
return (int)size;
}
nonblocking = af_unix_is_nonblocking(sock, flags);
timeout = sock->send_timeout;
af_unix_unlock();
if (nonblocking)
{
result = af_unix_error(EAGAIN);
break;
}
if (af_unix_wait(&peer->wait_queue, timeout) < 0)
{
result = -1;
break;
}
}
error = rt_get_errno();
rt_free(message);
af_unix_socket_put(peer);
rt_set_errno(error);
return result;
}
int af_unix_dgram_receive(struct af_unix_socket *sock, void *data,
size_t size, int flags, struct sockaddr *from,
socklen_t *from_length, rt_list_t *rights)
{
int result;
int nonblocking;
int timeout;
size_t copy_length;
struct af_unix_message *message;
if (size != 0 && data == RT_NULL)
{
return af_unix_error(EINVAL);
}
for (;;)
{
af_unix_lock();
if (sock->closed)
{
af_unix_unlock();
return af_unix_error(EBADF);
}
if (!rt_list_isempty(&sock->message_queue))
{
message = rt_list_entry(sock->message_queue.next,
struct af_unix_message, node);
copy_length = message->length;
if (copy_length > size)
{
copy_length = size;
}
if (copy_length != 0)
{
rt_memcpy(data, message->data, copy_length);
}
result = af_unix_address_copy(from, from_length,
&message->source,
message->source_length);
if (result < 0)
{
af_unix_unlock();
return result;
}
if ((flags & MSG_PEEK) == 0)
{
rt_list_remove(&message->node);
sock->message_count--;
if (message->rights != RT_NULL)
{
rt_list_insert_before(rights, &message->rights->node);
message->rights = RT_NULL;
}
af_unix_wakeup_writable_locked(sock);
rt_free(message);
}
af_unix_unlock();
return (int)copy_length;
}
if (sock->read_shutdown)
{
af_unix_unlock();
return 0;
}
nonblocking = af_unix_is_nonblocking(sock, flags);
timeout = sock->receive_timeout;
af_unix_unlock();
if (nonblocking)
{
return af_unix_error(EAGAIN);
}
if (af_unix_wait(&sock->wait_queue, timeout) < 0)
{
return -1;
}
}
}
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