* net/local/local_sockif.c
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>
#include <netinet/in.h>
#include <sys/param.h>
#include <nuttx/fs/ioctl.h>
#include <nuttx/kmalloc.h>
#include <nuttx/net/net.h>
#include <socket/socket.h>
#include "local/local.h"
* Private Function Prototypes
****************************************************************************/
static int local_setup(FAR struct socket *psock);
static sockcaps_t local_sockcaps(FAR struct socket *psock);
static void local_sockaddref(FAR struct socket *psock);
static int local_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr,
socklen_t addrlen);
static int local_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen);
static int local_getpeername(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen);
static int local_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr,
socklen_t addrlen);
static int local_poll(FAR struct socket *psock,
FAR struct pollfd *fds, bool setup);
static int local_close(FAR struct socket *psock);
static int local_ioctl(FAR struct socket *psock,
int cmd, unsigned long arg);
static int local_socketpair(FAR struct socket *psocks[2]);
static int local_shutdown(FAR struct socket *psock, int how);
#ifdef CONFIG_NET_SOCKOPTS
static int local_getsockopt(FAR struct socket *psock, int level,
int option, FAR void *value,
FAR socklen_t *value_len);
static int local_setsockopt(FAR struct socket *psock, int level,
int option, FAR const void *value,
socklen_t value_len);
#endif
static int local_mmap(FAR struct socket *psock,
FAR struct mm_map_entry_s *mmap);
* Public Data
****************************************************************************/
const struct sock_intf_s g_local_sockif =
{
local_setup,
local_sockcaps,
local_sockaddref,
local_bind,
local_getsockname,
local_getpeername,
#ifdef CONFIG_NET_LOCAL_STREAM
local_listen,
#else
NULL,
#endif
local_connect,
#ifdef CONFIG_NET_LOCAL_STREAM
local_accept,
#else
NULL,
#endif
local_poll,
local_sendmsg,
local_recvmsg,
local_close,
local_ioctl,
local_socketpair,
local_shutdown
#ifdef CONFIG_NET_SOCKOPTS
, local_getsockopt
, local_setsockopt
#endif
#ifdef CONFIG_NET_SENDFILE
, NULL
#endif
, local_mmap
};
* Private Functions
****************************************************************************/
* Name: local_sockif_alloc
*
* Description:
* Allocate and attach a local, Unix domain connection structure.
*
****************************************************************************/
static int local_sockif_alloc(FAR struct socket *psock)
{
FAR struct local_conn_s *conn;
local_lock();
conn = local_alloc();
local_unlock();
if (conn == NULL)
{
return -ENOMEM;
}
conn->lc_proto = psock->s_type;
psock->s_conn = conn;
return OK;
}
* Name: local_setup
*
* Description:
* Called for socket() to verify that the provided socket type and
* protocol are usable by this address family. Perform any family-
* specific socket fields.
*
* Input Parameters:
* psock A pointer to a user allocated socket structure
* to be initialized.
*
* Returned Value:
* Zero (OK) is returned on success. Otherwise, a negated errno value is
* returned.
*
****************************************************************************/
static int local_setup(FAR struct socket *psock)
{
* connection structure, it is unallocated at this point. It will not
* actually be initialized until the socket is connected.
*
* REVISIT: Only SOCK_STREAM and SOCK_DGRAM are supported. Should also
* support SOCK_RAW.
*/
switch (psock->s_type)
{
#ifdef CONFIG_NET_LOCAL_STREAM
case SOCK_STREAM:
if (psock->s_proto != 0 && psock->s_proto != IPPROTO_TCP)
{
return -EPROTONOSUPPORT;
}
return local_sockif_alloc(psock);
#endif
#ifdef CONFIG_NET_LOCAL_DGRAM
case SOCK_DGRAM:
if (psock->s_proto != 0 && psock->s_proto != IPPROTO_UDP)
{
return -EPROTONOSUPPORT;
}
return local_sockif_alloc(psock);
#endif
default:
return -EPROTONOSUPPORT;
}
}
* Name: local_sockcaps
*
* Description:
* Return the bit encoded capabilities of this socket.
*
* Input Parameters:
* psock - Socket structure of the socket whose capabilities are being
* queried.
*
* Returned Value:
* The set of socket cababilities is returned.
*
****************************************************************************/
static sockcaps_t local_sockcaps(FAR struct socket *psock)
{
return SOCKCAP_NONBLOCKING;
}
* Name: local_sockaddref
*
* Description:
* Increment the reference count on the underlying connection structure.
*
* Input Parameters:
* psock - Socket structure of the socket whose reference count will be
* incremented.
*
* Returned Value:
* None
*
****************************************************************************/
static void local_sockaddref(FAR struct socket *psock)
{
DEBUGASSERT(psock->s_domain == PF_LOCAL);
local_lock();
local_addref(psock->s_conn);
local_unlock();
}
* Name: local_bind
*
* Description:
* local_bind() gives the socket 'psock' the local address 'addr'. 'addr'
* is 'addrlen' bytes long. Traditionally, this is called "assigning a
* name to a socket." When a socket is created with socket(), it exists
* in a name space (address family) but has no name assigned.
*
* Input Parameters:
* psock Socket structure of the socket to bind
* addr Socket local address
* addrlen Length of 'addr'
*
* Returned Value:
* 0 on success; A negated errno value is returned on failure. See
* bind() for a list a appropriate error values.
*
****************************************************************************/
static int local_bind(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen)
{
int ret;
if (addrlen < sizeof(sa_family_t) || addr->sa_family != AF_LOCAL)
{
nerr("ERROR: Invalid address length: %d < %zu\n",
addrlen, sizeof(sa_family_t));
return -EBADF;
}
switch (psock->s_type)
{
#ifdef CONFIG_NET_LOCAL_STREAM
case SOCK_STREAM:
#endif
#ifdef CONFIG_NET_LOCAL_DGRAM
case SOCK_DGRAM:
#endif
{
ret = psock_local_bind(psock, addr, addrlen);
}
break;
default:
ret = -EBADF;
break;
}
return ret;
}
* Name: local_getsockname
*
* Description:
* The local_getsockname() function retrieves the locally-bound name of
* the specified local socket, stores this address in the sockaddr
* structure pointed to by the 'addr' argument, and stores the length of
* this address in the object pointed to by the 'addrlen' argument.
*
* If the actual length of the address is greater than the length of the
* supplied sockaddr structure, the stored address will be truncated.
*
* If the socket has not been bound to a local name, the value stored in
* the object pointed to by address is unspecified.
*
* Input Parameters:
* psock Socket structure of the socket to be queried
* addr sockaddr structure to receive data [out]
* addrlen Length of sockaddr structure [in/out]
*
* Returned Value:
* On success, 0 is returned, the 'addr' argument points to the address
* of the socket, and the 'addrlen' argument points to the length of the
* address. Otherwise, a negated errno value is returned. See
* getsockname() for the list of appropriate error numbers.
*
****************************************************************************/
static int local_getsockname(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen)
{
FAR struct sockaddr_un *unaddr = (FAR struct sockaddr_un *)addr;
FAR struct local_conn_s *conn = psock->s_conn;
if (*addrlen < sizeof(sa_family_t))
{
*addrlen = 0;
return OK;
}
unaddr->sun_family = AF_LOCAL;
if (*addrlen > sizeof(sa_family_t))
{
if (conn->lc_type == LOCAL_TYPE_UNNAMED)
{
*addrlen = sizeof(sa_family_t);
}
else
{
size_t namelen = strlen(conn->lc_path) + 1 +
(conn->lc_type == LOCAL_TYPE_ABSTRACT);
size_t pathlen = *addrlen - sizeof(sa_family_t);
if (pathlen < namelen)
{
namelen = pathlen;
}
if (conn->lc_type == LOCAL_TYPE_ABSTRACT)
{
unaddr->sun_path[0] = '\0';
strlcpy(&unaddr->sun_path[1], conn->lc_path, namelen - 1);
}
else
{
strlcpy(unaddr->sun_path, conn->lc_path, namelen);
}
*addrlen = sizeof(sa_family_t) + namelen;
}
}
return OK;
}
* Name: local_getpeername
*
* Description:
* The local_getpeername() function retrieves the remote-connected name of
* the specified local socket, stores this address in the sockaddr
* structure pointed to by the 'addr' argument, and stores the length of
* this address in the object pointed to by the 'addrlen' argument.
*
* If the actual length of the address is greater than the length of the
* supplied sockaddr structure, the stored address will be truncated.
*
* If the socket has not been bound to a local name, the value stored in
* the object pointed to by address is unspecified.
*
* Parameters:
* psock Socket structure of the socket to be queried
* addr sockaddr structure to receive data [out]
* addrlen Length of sockaddr structure [in/out]
*
* Returned Value:
* On success, 0 is returned, the 'addr' argument points to the address
* of the socket, and the 'addrlen' argument points to the length of the
* address. Otherwise, a negated errno value is returned. See
* getpeername() for the list of appropriate error numbers.
*
****************************************************************************/
static int local_getpeername(FAR struct socket *psock,
FAR struct sockaddr *addr,
FAR socklen_t *addrlen)
{
FAR struct sockaddr_un *unaddr = (FAR struct sockaddr_un *)addr;
FAR struct local_conn_s *conn = psock->s_conn;
FAR struct local_conn_s *peer = conn->lc_peer;
if (*addrlen < sizeof(sa_family_t))
{
*addrlen = 0;
return OK;
}
if (conn->lc_state != LOCAL_STATE_CONNECTED)
{
return -ENOTCONN;
}
unaddr->sun_family = AF_LOCAL;
if (*addrlen > sizeof(sa_family_t))
{
if (peer->lc_type == LOCAL_TYPE_UNNAMED)
{
*addrlen = sizeof(sa_family_t);
}
else
{
size_t namelen = strlen(peer->lc_path) + 1 +
(peer->lc_type == LOCAL_TYPE_ABSTRACT);
size_t pathlen = *addrlen - sizeof(sa_family_t);
if (pathlen < namelen)
{
namelen = pathlen;
}
if (peer->lc_type == LOCAL_TYPE_ABSTRACT)
{
unaddr->sun_path[0] = '\0';
strlcpy(&unaddr->sun_path[1], peer->lc_path, namelen - 1);
}
else
{
strlcpy(unaddr->sun_path, peer->lc_path, namelen);
}
*addrlen = sizeof(sa_family_t) + namelen;
}
}
return OK;
}
#ifdef CONFIG_NET_SOCKOPTS
* Name: local_getsockopt
*
* Description:
* local_getsockopt() retrieve the value for the option specified by the
* 'option' argument at the protocol level specified by the 'level'
* argument. If the size of the option value is greater than 'value_len',
* the value stored in the object pointed to by the 'value' argument will
* be silently truncated. Otherwise, the length pointed to by the
* 'value_len' argument will be modified to indicate the actual length
* of the 'value'.
*
* The 'level' argument specifies the protocol level of the option. To
* retrieve options at the socket level, specify the level argument as
* SOL_SOCKET.
*
* See <sys/socket.h> a complete list of values for the 'option' argument.
*
* Input Parameters:
* psock Socket structure of the socket to query
* level Protocol level to set the option
* option identifies the option to get
* value Points to the argument value
* value_len The length of the argument value
*
****************************************************************************/
static int local_getsockopt(FAR struct socket *psock, int level, int option,
FAR void *value, FAR socklen_t *value_len)
{
FAR struct local_conn_s *conn = psock->s_conn;
DEBUGASSERT(psock->s_domain == PF_LOCAL);
if (level == SOL_SOCKET)
{
switch (option)
{
#ifdef CONFIG_NET_LOCAL_SCM
case SO_PEERCRED:
{
if (*value_len != sizeof(struct ucred))
{
return -EINVAL;
}
memcpy(value, &conn->lc_peer->lc_cred, sizeof(struct ucred));
return OK;
}
#endif
case SO_SNDBUF:
{
int sendsize;
if (*value_len != sizeof(int))
{
return -EINVAL;
}
if (conn->lc_peer)
{
sendsize = conn->lc_peer->lc_rcvsize;
}
else
{
sendsize = CONFIG_DEV_FIFO_SIZE;
}
#ifdef CONFIG_NET_LOCAL_DGRAM
if (psock->s_type == SOCK_DGRAM)
{
sendsize -= sizeof(lc_size_t) * 2 + UNIX_PATH_MAX;
}
#endif
*(FAR int *)value = sendsize;
return OK;
}
case SO_RCVBUF:
{
int recvsize;
if (*value_len != sizeof(int))
{
return -EINVAL;
}
recvsize = conn->lc_rcvsize;
#ifdef CONFIG_NET_LOCAL_DGRAM
if (psock->s_type == SOCK_DGRAM)
{
recvsize -= sizeof(lc_size_t) * 2 + UNIX_PATH_MAX;
}
#endif
*(FAR int *)value = recvsize;
return OK;
}
}
}
return -ENOPROTOOPT;
}
* Name: local_setsockopt
*
* Description:
* local_setsockopt() sets the option specified by the 'option' argument,
* at the protocol level specified by the 'level' argument, to the value
* pointed to by the 'value' argument for the usrsock connection.
*
* The 'level' argument specifies the protocol level of the option. To set
* options at the socket level, specify the level argument as SOL_SOCKET.
*
* See <sys/socket.h> a complete list of values for the 'option' argument.
*
* Input Parameters:
* psock Socket structure of the socket to query
* level Protocol level to set the option
* option identifies the option to set
* value Points to the argument value
* value_len The length of the argument value
*
****************************************************************************/
static int local_setsockopt(FAR struct socket *psock, int level, int option,
FAR const void *value, socklen_t value_len)
{
FAR struct local_conn_s *conn = psock->s_conn;
DEBUGASSERT(psock->s_domain == PF_LOCAL);
if (level == SOL_SOCKET)
{
switch (option)
{
case SO_SNDBUF:
{
int ret = OK;
int rcvsize;
if (value_len < sizeof(int))
{
return -EINVAL;
}
local_lock();
if (conn->lc_peer)
{
rcvsize = MIN(*(FAR const int *)value,
CONFIG_DEV_PIPE_MAXSIZE);
if (conn->lc_peer->lc_infile.f_inode != NULL)
{
ret = file_ioctl(&conn->lc_peer->lc_infile,
PIPEIOC_SETSIZE, rcvsize);
}
if (ret == OK)
{
conn->lc_peer->lc_rcvsize = rcvsize;
}
}
#ifdef CONFIG_NET_LOCAL_STREAM
else if (psock->s_type == SOCK_STREAM)
{
ret = -ENOTCONN;
}
#endif
local_unlock();
return ret;
}
case SO_RCVBUF:
{
int ret = OK;
int rcvsize;
if (value_len < sizeof(int))
{
return -EINVAL;
}
local_lock();
rcvsize = *(FAR const int *)value;
#ifdef CONFIG_NET_LOCAL_DGRAM
if (psock->s_type == SOCK_DGRAM)
{
rcvsize += sizeof(lc_size_t) * 2 + UNIX_PATH_MAX;
}
#endif
rcvsize = MIN(rcvsize, CONFIG_DEV_PIPE_MAXSIZE);
if (conn->lc_infile.f_inode != NULL)
{
ret = file_ioctl(&conn->lc_infile, PIPEIOC_SETSIZE,
rcvsize);
}
#ifdef CONFIG_NET_LOCAL_DGRAM
else if (psock->s_type == SOCK_DGRAM &&
conn->lc_state == LOCAL_STATE_BOUND)
{
ret = local_create_halfduplex(conn, conn->lc_path,
rcvsize);
if (ret >= 0)
{
ret = local_open_receiver(conn, true);
if (ret >= 0)
{
ret = file_ioctl(&conn->lc_infile, PIPEIOC_SETSIZE,
rcvsize);
}
if (conn->lc_infile.f_inode != NULL)
{
file_close(&conn->lc_infile);
}
}
}
#endif
if (ret == OK)
{
conn->lc_rcvsize = rcvsize;
}
local_unlock();
return ret;
}
}
}
return -ENOPROTOOPT;
}
#endif
* Name: local_connect
*
* Description:
* local_connect() connects the local socket referred to by the structure
* 'psock' to the address specified by 'addr'. The addrlen argument
* specifies the size of 'addr'. The format of the address in 'addr' is
* determined by the address space of the socket 'psock'.
*
* If the socket 'psock' is of type SOCK_DGRAM then 'addr' is the address
* to which datagrams are sent by default, and the only address from which
* datagrams are received. If the socket is of type SOCK_STREAM or
* SOCK_SEQPACKET, this call attempts to make a connection to the socket
* that is bound to the address specified by 'addr'.
*
* Generally, connection-based protocol sockets may successfully
* local_connect() only once; connectionless protocol sockets may use
* local_connect() multiple times to change their association.
* Connectionless sockets may dissolve the association by connecting to
* an address with the sa_family member of sockaddr set to AF_UNSPEC.
*
* Input Parameters:
* psock Pointer to a socket structure initialized by psock_socket()
* addr Server address (form depends on type of socket)
* addrlen Length of actual 'addr'
*
* Returned Value:
* 0 on success; a negated errno value on failure. See connect() for the
* list of appropriate errno values to be returned.
*
****************************************************************************/
static int local_connect(FAR struct socket *psock,
FAR const struct sockaddr *addr, socklen_t addrlen)
{
if (addr->sa_family != AF_LOCAL || addrlen < sizeof(sa_family_t))
{
return -EBADF;
}
switch (psock->s_type)
{
#ifdef CONFIG_NET_LOCAL_STREAM
case SOCK_STREAM:
{
FAR struct socket_conn_s *conn = psock->s_conn;
if (_SS_ISCONNECTED(conn->s_flags))
{
return -EISCONN;
}
return psock_local_connect(psock, addr);
}
break;
#endif
#ifdef CONFIG_NET_LOCAL_DGRAM
case SOCK_DGRAM:
{
return -ENOSYS;
}
break;
#endif
default:
return -EBADF;
}
}
* Name: local_poll
*
* Description:
* The standard poll() operation redirects operations on socket descriptors
* to local_poll which, indiectly, calls to function.
*
* Input Parameters:
* psock - An instance of the internal socket structure.
* fds - The structure describing the events to be monitored, OR NULL if
* this is a request to stop monitoring events.
* setup - true: Setup up the poll; false: Teardown the poll
*
* Returned Value:
* 0: Success; Negated errno on failure
*
****************************************************************************/
static int local_poll(FAR struct socket *psock, FAR struct pollfd *fds,
bool setup)
{
if (setup)
{
return local_pollsetup(psock, fds);
}
else
{
return local_pollteardown(psock, fds);
}
}
* Name: local_close
*
* Description:
* Performs the close operation on a local, Unix socket instance
*
* Input Parameters:
* psock Socket instance
*
* Returned Value:
* 0 on success; a negated errno value is returned on any failure.
*
* Assumptions:
*
****************************************************************************/
static int local_close(FAR struct socket *psock)
{
switch (psock->s_type)
{
#ifdef CONFIG_NET_LOCAL_STREAM
case SOCK_STREAM:
#endif
#ifdef CONFIG_NET_LOCAL_DGRAM
case SOCK_DGRAM:
#endif
{
* could be more if the socket was dup'ed).
*/
local_lock();
local_subref(psock->s_conn);
local_unlock();
return OK;
}
default:
return -EBADF;
}
}
* Name: local_ioctl
*
* Description:
* This function performs local device specific operations.
*
* Parameters:
* psock A reference to the socket structure of the socket
* cmd The ioctl command
* arg The argument of the ioctl cmd
*
****************************************************************************/
static int local_ioctl(FAR struct socket *psock, int cmd, unsigned long arg)
{
FAR struct local_conn_s *conn = psock->s_conn;
int ret = OK;
switch (cmd)
{
case FIONBIO:
if (conn->lc_infile.f_inode != NULL)
{
ret = file_ioctl(&conn->lc_infile, cmd, arg);
}
if (ret >= 0 && conn->lc_outfile.f_inode != NULL)
{
ret = file_ioctl(&conn->lc_outfile, cmd, arg);
}
break;
case FIONREAD:
if (conn->lc_infile.f_inode != NULL)
{
ret = file_ioctl(&conn->lc_infile, cmd, arg);
}
else
{
ret = -ENOTCONN;
}
break;
case FIONWRITE:
case FIONSPACE:
if (conn->lc_outfile.f_inode != NULL)
{
ret = file_ioctl(&conn->lc_outfile, cmd, arg);
}
else
{
ret = -ENOTCONN;
}
break;
case PIPEIOC_POLLINTHRD:
if (conn->lc_infile.f_inode != NULL)
{
ret = file_ioctl(&conn->lc_infile, cmd, arg);
}
else
{
ret = -ENOTCONN;
}
break;
case PIPEIOC_POLLOUTTHRD:
if (conn->lc_outfile.f_inode != NULL)
{
ret = file_ioctl(&conn->lc_outfile, cmd, arg);
}
else
{
ret = -ENOTCONN;
}
break;
case FIOC_FILEPATH:
snprintf((FAR char *)(uintptr_t)arg, PATH_MAX, "local:[%s]",
conn->lc_path);
break;
case BIOC_FLUSH:
ret = -EINVAL;
break;
default:
ret = -ENOTTY;
break;
}
return ret;
}
* Name: local_socketpair
*
* Description:
* Create a pair of connected sockets between psocks[2]
*
* Parameters:
* psocks A reference to the socket structure of the socket pair
*
****************************************************************************/
static int local_socketpair(FAR struct socket *psocks[2])
{
FAR struct local_conn_s *conns[2];
bool nonblock;
int ret;
int i;
for (i = 0; i < 2; i++)
{
conns[i] = psocks[i]->s_conn;
snprintf(conns[i]->lc_path,
sizeof(conns[i]->lc_path), "socketpair%p", psocks[0]);
conns[i]->lc_proto = psocks[i]->s_type;
conns[i]->lc_type = LOCAL_TYPE_PATHNAME;
conns[i]->lc_state = LOCAL_STATE_BOUND;
}
conns[0]->lc_instance_id = conns[1]->lc_instance_id
#ifdef CONFIG_NET_LOCAL_STREAM
= local_generate_instance_id();
#else
= -1;
#endif
ret = local_create_fifos(conns[0], conns[0]->lc_rcvsize,
conns[1]->lc_rcvsize);
if (ret < 0)
{
goto errout;
}
nonblock = _SS_ISNONBLOCK(conns[0]->lc_conn.s_flags);
ret = local_open_client_tx(conns[0], conns[1], nonblock);
if (ret < 0)
{
goto errout;
}
ret = local_open_server_rx(conns[1], nonblock);
if (ret < 0)
{
goto errout;
}
ret = local_open_server_tx(conns[1], nonblock);
if (ret < 0)
{
goto errout;
}
ret = local_open_client_rx(conns[0], conns[1], nonblock);
if (ret < 0)
{
goto errout;
}
conns[0]->lc_state = conns[1]->lc_state
= LOCAL_STATE_CONNECTED;
#ifdef CONFIG_NET_LOCAL_DGRAM
if (psocks[0]->s_type == SOCK_DGRAM)
{
for (i = 0; i < 2; i++)
{
ret = local_set_pollthreshold(conns[i], sizeof(lc_size_t));
if (ret < 0)
{
goto errout;
}
}
}
#endif
return OK;
errout:
local_release_fifos(conns[0]);
return ret;
}
* Name: local_shutdown
*
* Description:
* The shutdown() function will cause all or part of a full-duplex
* connection on the socket associated with the file descriptor socket to
* be shut down.
*
* The shutdown() function disables subsequent send and/or receive
* operations on a socket, depending on the value of the how argument.
*
* Input Parameters:
* sockfd - Specifies the file descriptor of the socket.
* how - Specifies the type of shutdown. The values are as follows:
*
* SHUT_RD - Disables further receive operations.
* SHUT_WR - Disables further send operations.
* SHUT_RDWR - Disables further send and receive operations.
*
****************************************************************************/
static int local_shutdown(FAR struct socket *psock, int how)
{
DEBUGASSERT(psock->s_domain == PF_LOCAL);
switch (psock->s_type)
{
#ifdef CONFIG_NET_LOCAL_STREAM
case SOCK_STREAM:
{
FAR struct local_conn_s *conn = psock->s_conn;
if (how & SHUT_RD)
{
if (conn->lc_infile.f_inode != NULL)
{
file_close(&conn->lc_infile);
conn->lc_infile.f_inode = NULL;
}
}
if (how & SHUT_WR)
{
if (conn->lc_outfile.f_inode != NULL)
{
file_close(&conn->lc_outfile);
conn->lc_outfile.f_inode = NULL;
}
}
}
return OK;
#endif
#ifdef CONFIG_NET_LOCAL_DGRAM
case SOCK_DGRAM:
return -EOPNOTSUPP;
#endif
default:
return -EBADF;
}
}
* Name: local_munmap
*
* Description:
* Unmap a previously mapped memory region.
*
****************************************************************************/
static int local_munmap(FAR struct task_group_s *group,
FAR struct mm_map_entry_s *mmap,
FAR void *start, size_t length)
{
FAR void *addr = mmap->vaddr;
mm_map_remove(get_current_mm(), mmap);
kumm_free(addr);
return OK;
}
* Name: local_mmap
*
* Description:
* Map a memory region.
*
****************************************************************************/
static int local_mmap(FAR struct socket *psock,
FAR struct mm_map_entry_s *mmap)
{
FAR void *addr;
int ret = OK;
addr = kumm_malloc(mmap->length);
if (addr == NULL)
{
ret = -ENOMEM;
}
else
{
mmap->vaddr = addr;
mmap->munmap = local_munmap;
mm_map_add(get_current_mm(), mmap);
}
return ret;
}
* Public Functions
****************************************************************************/