/****************************************************************************
* net/recvfrom.c
*
* Copyright (C) 2007 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#ifdef CONFIG_NET
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <errno.h>
#include <arch/irq.h>
#include "net-internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
struct recvfrom_s
{
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
FAR struct socket *rf_sock; /* The parent socket structure */
#endif
sem_t rf_sem; /* Semaphore signals recv completion */
sint16 rf_buflen; /* Length of receive buffer (error if <0) */
char *rf_buffer; /* Pointer to receive buffer */
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
uint32 rf_starttime; /* rcv start time for determining timeout */
#endif
};
/****************************************************************************
* Private Functions
****************************************************************************/
void recvfrom_interrupt(void *private)
{
struct recvfrom_s *pstate = (struct recvfrom_s *)private;
size_t recvlen;
/* 'private' might be null in some race conditions (?) */
if (pstate)
{
/* If new data is available, then complete the read action. */
if (uip_newdata())
{
/* Get the length of the data to return */
if (uip_len > pstate-> rf_buflen)
{
recvlen = pstate-> rf_buflen;
}
else
{
recvlen = uip_len;
}
/* Copy the appdate into the user data and send it */
memcpy(pstate->rf_buffer, uip_appdata, recvlen);
/* Don't allow any further call backs. */
uip_conn->private = NULL;
uip_conn->callback = NULL;
/* Wake up the waiting thread, returning the number of bytes
* actually read.
*/
pstate->rf_buflen = recvlen;
sem_post(&pstate-> rf_sem);
}
/* No data has been received -- this is some other event... probably a
* poll -- check for a timeout.
*/
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
else if (pstate->rf_sock)
{
/* Check if SO_RCVTIMEO has been selected for this socket */
if (pstate->rf_sock->s_rcvtimeo)
{
/* Yes.. Check if the timeout has elapsed */
if (net_timeo(pstate->rf_starttime, pstate->rf_sock->s_rcvtimeo))
{
/* Don't allow any further call backs. */
uip_conn->private = NULL;
uip_conn->callback = NULL;
/* Wake up the waiting thread, returning the error -EAGAIN
* that signals the timeout event
*/
pstate->rf_buflen = -EAGAIN;
sem_post(&pstate-> rf_sem);
}
}
}
#endif
}
}
/****************************************************************************
* Global Functions
****************************************************************************/
/****************************************************************************
* Function: recvfrom
*
* Description:
* recvfrom() receives messages from a socket, and may be used to receive
* data on a socket whether or not it is connection-oriented.
*
* If from is not NULL, and the underlying protocol provides the source
* address, this source address is filled in. The argument fromlen
* initialized to the size of the buffer associated with from, and modified
* on return to indicate the actual size of the address stored there.
*
* Parameters:
* sockfd Socket descriptor of socket
* buf Buffer to receive data
* len Length of buffer
* flags Receive flags
* from Address of source
* fromlen The length of the address structure
*
* Returned Value:
* On success, returns the number of characters sent. On error,
* -1 is returned, and errno is set appropriately:
*
* EAGAIN
* The socket is marked non-blocking and the receive operation would block,
* or a receive timeout had been set and the timeout expired before data
* was received.
* EBADF
* The argument sockfd is an invalid descriptor.
* ECONNREFUSED
* A remote host refused to allow the network connection (typically because
* it is not running the requested service).
* EFAULT
* The receive buffer pointer(s) point outside the process's address space.
* EINTR
* The receive was interrupted by delivery of a signal before any data were
* available.
* EINVAL
* Invalid argument passed.
* ENOMEM
* Could not allocate memory.
* ENOTCONN
* The socket is associated with a connection-oriented protocol and has
* not been connected.
* ENOTSOCK
* The argument sockfd does not refer to a socket.
*
* Assumptions:
*
****************************************************************************/
ssize_t recvfrom(int sockfd, void *buf, size_t len, int flags, struct sockaddr *from,
socklen_t *fromlen)
{
FAR struct socket *psock;
#ifdef CONFIG_NET_IPv6
FAR const struct sockaddr_in6 *infrom = (const struct sockaddr_in6 *)from;
#else
FAR const struct sockaddr_in *infrom = (const struct sockaddr_in *)from;
#endif
#ifdef CONFIG_NET_UDP
struct uip_udp_conn *udp_conn;
struct recvfrom_s state;
irqstate_t save;
#endif
int err;
int ret;
/* Get the underlying socket structure */
/* Verify that the sockfd corresponds to valid, allocated socket */
psock = sockfd_socket(sockfd);
if (!psock || psock->s_crefs <= 0)
{
err = EBADF;
goto errout;
}
/* Perform the TCP/IP recv() operation */
if (psock->s_type == SOCK_STREAM)
{
#warning "TCP/IP recv not implemented"
err = ENOSYS;
goto errout;
}
/* Perform the UDP recvfrom() operation */
#ifdef CONFIG_NET_UDP
/* Initialize the state structure. This is done with interrupts
* disabled because we don't want anything to happen until we
* are ready.
*/
save = irqsave();
memset(&state, 0, sizeof(struct recvfrom_s));
(void)sem_init(&state. rf_sem, 0, 0); /* Doesn't really fail */
state. rf_buflen = len;
state. rf_buffer = buf;
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
/* Set up the start time for the timeout */
state.rf_starttime = g_system_timer;
#endif
/* Setup the UDP socket */
ret = uip_udpconnect(psock->s_conn, NULL);
if (ret < 0)
{
irqrestore(save);
err = -ret;
goto errout;
}
/* Set up the callback in the connection */
udp_conn = (struct uip_udp_conn *)psock->s_conn;
udp_conn->private = (void*)&state;
udp_conn->callback = recvfrom_interrupt;
/* Wait for either the read to complete: NOTES: (1) sem_wait will also
* terminate if a signal is received, (2) interrupts are disabled! They
* will be re-enabled while the task sleeps and automatically re-enabled
* when the task restarts.
*/
ret = sem_wait(&state. rf_sem);
/* Make sure that no further interrupts are processed */
uip_conn->private = NULL;
uip_conn->callback = NULL;
sem_destroy(&state. rf_sem);
irqrestore(save);
/* Check for a timeout. Errors are signaled by negative errno values
* for the rcv length
*/
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
if (state.rf_buflen < 0)
{
/* Return EGAIN on a timeout */
err = -state.rf_buflen;
goto errout;
}
#endif
/* If sem_wait failed, then we were probably reawakened by a signal. In
* this case, sem_wait will have set errno appropriately.
*/
if (ret < 0)
{
return ERROR;
}
#warning "Needs to return server address"
return state.rf_buflen;
#else
err = ENOSYS;
#endif
errout:
*get_errno_ptr() = err;
return ERROR;
}
#endif /* CONFIG_NET */
