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Implment TCP recv()

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@340 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo 2007-09-09 19:47:52 +00:00
parent dcf7c7c365
commit a401a91d03
8 changed files with 353 additions and 257 deletions
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15
include/net/uip/uip.h
View File

@ -893,6 +893,11 @@ extern int uip_udpconnect(struct uip_udp_conn *conn, const struct sockaddr_in6 *
extern int uip_udpconnect(struct uip_udp_conn *conn, const struct sockaddr_in *addr);
#endif
/* Enable/disable UDP callbacks on a connection */
extern void uip_udpenable(struct uip_udp_conn *conn);
extern void uip_udpdisable(struct uip_udp_conn *conn);
/* Send a UDP datagram of length len on the current connection.
*
* This function can only be called in response to a UDP event (poll
@ -1124,14 +1129,4 @@ extern int uip_udpconnect(struct uip_udp_conn *conn, const struct sockaddr_in *a
#define uip_ipaddr4(addr) (htons(((uint16 *)(addr))[1]) & 0xff)
/* This function is called user code to set up the wait */
extern int uip_event_wait(uint16 waitflags);
/* This function is called from uip_interrupt() to wake up any
* waiting threads/tasks.
*/
extern void uip_event_signal(void);
#endif /* __NET_UIP_UIP_H */

4
net/connect.c
View File

@ -182,8 +182,6 @@ int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen)
#ifdef CONFIG_NET_UDP
case SOCK_DGRAM:
#warning Put UDP connect logic here
#if 0
{
int ret = uip_udpconnect(psock->s_conn, inaddr);
if (ret < 0)
@ -194,7 +192,7 @@ int connect(int sockfd, const struct sockaddr *addr, socklen_t addrlen)
}
break;
#endif
#endif
default:
err = EBADF;
goto errout;

339
net/recvfrom.c
View File

@ -53,6 +53,8 @@
* Definitions
****************************************************************************/
#define TCP_TIMEO 10 /* Deciseconds after data received before recv() returns */
/****************************************************************************
* Private Types
****************************************************************************/
@ -63,27 +65,33 @@ struct recvfrom_s
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) */
size_t rf_buflen; /* Length of receive buffer */
char *rf_buffer; /* Pointer to receive buffer */
#if defined(CONFIG_NET_SOCKOPTS) && !defined(CONFIG_DISABLE_CLOCK)
#ifndef CONFIG_DISABLE_CLOCK
uint32 rf_starttime; /* rcv start time for determining timeout */
#endif
size_t rf_recvlen; /* The received length */
int rf_result; /* OK on success, otherwise a negated errno. */
};
/****************************************************************************
* Private Functions
****************************************************************************/
void recvfrom_interrupt(void *private)
static void recvfrom_interrupt(void *private)
{
struct recvfrom_s *pstate = (struct recvfrom_s *)private;
struct uip_udp_conn *udp_conn;
FAR struct socket *psock;
size_t recvlen;
/* 'private' might be null in some race conditions (?) */
if (pstate)
{
/* Get the socket reference from the private data */
psock = pstate->rf_sock;
/* If new data is available, then complete the read action. */
if (uip_newdata())
@ -98,58 +106,246 @@ void recvfrom_interrupt(void *private)
recvlen = uip_len;
}
/* Copy the appdate into the user data and send it */
/* Copy the new appdata into the user buffer */
memcpy(pstate->rf_buffer, uip_appdata, recvlen);
/* Don't allow any further call backs. */
/* Update the accumulated size of the data read */
udp_conn = (struct uip_udp_conn *)pstate->rf_sock->s_conn;
udp_conn->private = NULL;
udp_conn->callback = NULL;
pstate->rf_recvlen += recvlen;
pstate->rf_buffer += recvlen;
pstate->rf_buflen -= recvlen;
/* Wake up the waiting thread, returning the number of bytes
* actually read.
*/
/* Are we finished? If this is a UDP socket or if the user
* buffer has been filled, then we are finished.
*/
pstate->rf_buflen = recvlen;
sem_post(&pstate->rf_sem);
#ifdef CONFIG_NET_UDP
if (psock->s_type == SOCK_DGRAM)
{
struct uip_udp_conn *udp_conn;
/* Don't allow any further UDP call backs. */
udp_conn = (struct uip_udp_conn *)psock->s_conn;
udp_conn->private = NULL;
udp_conn->callback = NULL;
/* Wake up the waiting thread, returning the number of bytes
* actually read.
*/
sem_post(&pstate->rf_sem);
}
else
#endif
if (pstate->rf_buflen == 0)
{
struct uip_conn *conn;
/* The TCP receive buffer is full. Return now, perhaps truncating
* the received data (need to fix that).
*
* Don't allow any further TCP call backs.
*/
conn = (struct uip_conn *)psock->s_conn;
conn->private = NULL;
conn->callback = NULL;
/* Wake up the waiting thread, returning the number of bytes
* actually read.
*/
sem_post(&pstate->rf_sem);
}
/* Reset the timeout. We will want a short timeout to terminate
* the TCP receive.
*/
#ifndef CONFIG_DISABLE_CLOCK
pstate->rf_starttime = g_system_timer;
#endif
}
/* 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)
#ifndef CONFIG_DISABLE_CLOCK
else
{
/* Check if SO_RCVTIMEO has been selected for this socket */
socktimeo_t timeo;
if (pstate->rf_sock->s_rcvtimeo)
/* If this is a TCP socket that has already received some data,
* than we will always use a short timeout.
*/
if (pstate->rf_recvlen > 0)
{
/* Use the short timeout */
timeo = TCP_TIMEO;
}
/* No.. check for a timeout configured via setsockopts(SO_RCVTIMEO).
* If non... we well let the read hang forever.
*/
else
{
#ifdef CONFIG_NET_SOCKOPTS
timeo = psock->s_rcvtimeo;
#else
timeo = 0;
#endif
}
/* Is there an effective timeout? */
if (timeo)
{
/* Yes.. Check if the timeout has elapsed */
if (net_timeo(pstate->rf_starttime, pstate->rf_sock->s_rcvtimeo))
if (net_timeo(pstate->rf_starttime, timeo))
{
/* Don't allow any further call backs. */
udp_conn = (struct uip_udp_conn *)pstate->rf_sock->s_conn;
udp_conn->private = NULL;
udp_conn->callback = NULL;
/* Wake up the waiting thread, returning the error -EAGAIN
* that signals the timeout event
/* Yes.. the timeout has elapsed... do not allow any further
* callbacks
*/
#ifdef CONFIG_NET_UDP
if (psock->s_type == SOCK_DGRAM)
{
struct uip_udp_conn *udp_conn;
/* Stop further callbacks */
udp_conn = (struct uip_udp_conn *)psock->s_conn;
udp_conn->private = NULL;
udp_conn->callback = NULL;
/* Report a timeout error */
pstate->rf_result = -EAGAIN;
}
else
#endif
{
struct uip_conn *conn;
conn = (struct uip_conn *)psock->s_conn;
conn->private = NULL;
conn->callback = NULL;
/* Report an error only if no data has been received */
if (pstate->rf_recvlen == 0)
{
/* Report the timeout error */
pstate->rf_result = -EAGAIN;
}
}
/* Wake up the waiting thread, returning either the error -EAGAIN
* that signals the timeout event or the data received up to
* the point tht the timeout occured (no error).
*/
pstate->rf_buflen = -EAGAIN;
sem_post(&pstate->rf_sem);
}
}
}
}
#endif
}
}
/****************************************************************************
* Function: recvfrom_init
*
* Description:
* Initialize the state structure
*
* Parameters:
* psock Pointer to the socket structure for the socket
* buf Buffer to receive data
* len Length of buffer
* pstate A pointer to the state structure to be initialized
*
* Returned Value:
* None
*
* Assumptions:
*
****************************************************************************/
static void recvfrom_init(FAR struct socket *psock, FAR void *buf, size_t len,
struct recvfrom_s *pstate)
{
/* Initialize the state structure. */
memset(pstate, 0, sizeof(struct recvfrom_s));
(void)sem_init(&pstate->rf_sem, 0, 0); /* Doesn't really fail */
pstate->rf_sock = psock;
pstate->rf_buflen = len;
pstate->rf_buffer = buf;
#ifndef CONFIG_DISABLE_CLOCK
/* Set up the start time for the timeout */
pstate->rf_starttime = g_system_timer;
#endif
}
/****************************************************************************
* Function: recvfrom_result
*
* Description:
* Evaluate the result of the recv operations
*
* Parameters:
* result The result of the sem_wait operation (may indicate EINTR)
* pstate A pointer to the state structure to be initialized
*
* Returned Value:
* The result of the recv operation with errno set appropriately
*
* Assumptions:
*
****************************************************************************/
static ssize_t recvfrom_result(int result, struct recvfrom_s *pstate)
{
int save_errno = *get_errno_ptr(); /* In case something we do changes it */
/* Release semaphore in the state structure */
sem_destroy(&pstate->rf_sem);
/* Check for a error/timeout detected by the interrupt handler. Errors are
* signaled by negative errno values for the rcv length
*/
if (pstate->rf_result < 0)
{
/* Return EGAIN on a timeout */
return pstate->rf_result;
}
/* If sem_wait failed, then we were probably reawakened by a signal. In
* this case, sem_wait will have set errno appropriately.
*/
if (result < 0)
{
return -save_errno;
}
return pstate->rf_recvlen;
}
/****************************************************************************
* Function: udp_recvfrom
*
@ -182,7 +378,6 @@ static ssize_t udp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
struct uip_udp_conn *udp_conn;
struct recvfrom_s state;
irqstate_t save;
int err;
int ret;
/* Perform the UDP recvfrom() operation */
@ -193,25 +388,15 @@ static ssize_t udp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
*/
save = irqsave();
memset(&state, 0, sizeof(struct recvfrom_s));
(void)sem_init(&state. rf_sem, 0, 0); /* Doesn't really fail */
state.rf_sock = psock;
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
recvfrom_init(psock, buf, len, &state);
/* Setup the UDP socket */
err = uip_udpconnect(psock->s_conn, NULL);
if (err < 0)
ret = uip_udpconnect(psock->s_conn, NULL);
if (ret < 0)
{
irqrestore(save);
return err;
return ret;
}
/* Set up the callback in the connection */
@ -220,6 +405,10 @@ static ssize_t udp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
udp_conn->private = (void*)&state;
udp_conn->callback = recvfrom_interrupt;
/* Enable the UDP socket */
uip_udpenable(psock->s_conn);
/* Wait for either the receive to complete or for an error/timeout to occur.
* 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
@ -230,33 +419,13 @@ static ssize_t udp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
/* Make sure that no further interrupts are processed */
uip_udpdisable(psock->s_conn);
udp_conn->private = NULL;
udp_conn->callback = NULL;
sem_destroy(&state. rf_sem);
irqrestore(save);
/* Check for a error/timeout detected by the interrupt handler. Errors are
* signaled by negative errno values for the rcv length
*/
if (state.rf_buflen < 0)
{
/* Return EGAIN on a timeout */
return state.rf_buflen;
}
/* 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 -*get_errno_ptr();
}
#warning "Needs to return server address"
return state.rf_buflen;
return recvfrom_result(ret, &state);
}
#endif /* CONFIG_NET_UDP */
@ -288,6 +457,11 @@ static ssize_t tcp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
FAR const struct sockaddr_in *infrom )
#endif
{
struct uip_conn *conn;
struct recvfrom_s state;
irqstate_t save;
int ret;
/* Verify that the SOCK_STREAM has been connected */
if (_SS_ISCONNECTED(psock->s_flags))
@ -297,8 +471,37 @@ static ssize_t tcp_recvfrom(FAR struct socket *psock, FAR void *buf, size_t len,
return -ENOTCONN;
}
#warning "TCP/IP recv not implemented"
return -ENOSYS;
/* Initialize the state structure. This is done with interrupts
* disabled because we don't want anything to happen until we
* are ready.
*/
save = irqsave();
recvfrom_init(psock, buf, len, &state);
/* Set up the callback in the connection */
conn = (struct uip_conn *)psock->s_conn;
conn->private = (void*)&state;
conn->callback = recvfrom_interrupt;
/* Wait for either the receive to complete or for an error/timeout to occur.
* 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 */
conn->private = NULL;
conn->callback = NULL;
irqrestore(save);
#warning "Needs to return server address"
return recvfrom_result(ret, &state);
}
/****************************************************************************

19
net/sendto.c
View File

@ -244,9 +244,26 @@ ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
udp_conn = (struct uip_udp_conn *)psock->s_conn;
udp_conn->private = (void*)&state;
udp_conn->callback = sendto_interrupt;
irqrestore(save);
/* Enable the UDP socket */
uip_udpenable(psock->s_conn);
/* Wait for either the receive to complete or for an error/timeout to occur.
* 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.
*/
sem_wait(&state.st_sem);
/* Make sure that no further interrupts are processed */
uip_udpdisable(psock->s_conn);
udp_conn->private = NULL;
udp_conn->callback = NULL;
irqrestore(save);
sem_destroy(&state.st_sem);
/* Set the socket state to idle */

2
net/uip/Make.defs
View File

@ -35,5 +35,5 @@
UIP_ASRCS =
UIP_CSRCS = uip-arp.c uip.c uip-fw.c uip-neighbor.c uip-split.c \
uip-tcpconn.c uip-udpconn.c uip-wait.c
uip-tcpconn.c uip-udpconn.c

96
net/uip/uip-udpconn.c
View File

@ -114,34 +114,26 @@ static inline void _uip_semtake(sem_t *sem)
*
* Description:
* Find the UDP connection that uses this local port number. Called only
* from user, non-interrupt level logic.
* from user user level code, but with interrupts disabled.
*
****************************************************************************/
struct uip_udp_conn *uip_find_conn( uint16 portno )
static inline struct uip_udp_conn *uip_find_conn( uint16 portno )
{
struct uip_udp_conn *conn;
uint16 nlastport = htons(g_last_udp_port);
irqstate_t flags;
int i;
/* Now search each active connection structure. This list is modifiable
* from interrupt level, we we must diable interrupts to access it safely.
*/
/* Now search each connection structure.*/
flags = irqsave();
conn = (struct uip_udp_conn *)g_active_udp_connections.head;
while (conn)
for (i = 0; i < UIP_UDP_CONNS; i++)
{
if (conn->lport == nlastport)
if (g_udp_connections[ i ].lport == nlastport)
{
break;
return &g_udp_connections[ i ];
}
conn = (struct uip_udp_conn *)conn->node.flink;
}
irqrestore(flags);
return conn;
return NULL;
}
/****************************************************************************
@ -198,7 +190,7 @@ struct uip_udp_conn *uip_udpalloc(void)
conn = (struct uip_udp_conn *)dq_remfirst(&g_free_udp_connections);
if (conn)
{
/* Make sure that the connectin is marked as uninitialized */
/* Make sure that the connection is marked as uninitialized */
conn->lport = 0;
}
@ -211,25 +203,13 @@ struct uip_udp_conn *uip_udpalloc(void)
*
* Description:
* Free a UDP connection structure that is no longer in use. This should be
* done by the implementation of close()
* done by the implementation of close(). uip_udpdisable must have been
* previously called.
*
****************************************************************************/
void uip_udpfree(struct uip_udp_conn *conn)
{
irqstate_t flags;
/* The active list is accessed from the interrupt level and me must be
* certain that no interrupts occur while the active list is modified.
*/
flags = irqsave();
if (conn->lport != 0)
{
dq_rem(&conn->node, &g_active_udp_connections);
}
irqrestore(flags);
/* The free list is only accessed from user, non-interrupt level and
* is protected by a semaphore (that behaves like a mutex).
*/
@ -308,14 +288,25 @@ void uip_udppoll(unsigned int conn)
uip_interrupt(UIP_UDP_TIMER);
}
/* This function sets up a new UDP connection. The function will
/****************************************************************************
* Name: uip_udpconnect()
*
* Description:
* This function sets up a new UDP connection. The function will
* automatically allocate an unused local port for the new
* connection. However, another port can be chosen by using the
* uip_udpbind() call, after the uip_udpconnect() function has been
* called.
*
* uip_udpenable() must be called before the connection is made active (i.e.,
* is eligible for callbacks.
*
* addr The address of the remote host.
*/
*
* Assumptions:
* This function is called user code. Interrupts may be enabled.
*
****************************************************************************/
#ifdef CONFIG_NET_IPv6
int uip_udpconnect(struct uip_udp_conn *conn, const struct sockaddr_in6 *addr)
@ -329,6 +320,7 @@ int uip_udpconnect(struct uip_udp_conn *conn, const struct sockaddr_in *addr)
* number that is not being used by any other connection.
*/
flags = irqsave();
do
{
/* Guess that the next available port number will be the one after
@ -348,6 +340,7 @@ int uip_udpconnect(struct uip_udp_conn *conn, const struct sockaddr_in *addr)
/* Initialize and return the connection structure, bind it to the port number */
conn->lport = HTONS(g_last_udp_port);
irqrestore(flags);
if (addr)
{
@ -356,21 +349,46 @@ int uip_udpconnect(struct uip_udp_conn *conn, const struct sockaddr_in *addr)
}
else
{
conn->rport = 0;
uip_ipaddr_copy(&conn->ripaddr, &all_zeroes_addr);
}
conn->rport = 0;
uip_ipaddr_copy(&conn->ripaddr, &all_zeroes_addr);
}
conn->ttl = UIP_TTL;
return OK;
}
/* Now add the connection structure to the active connectionlist. This list
/****************************************************************************
* Name: uip_udpenable() uip_udpdisable.
*
* Description:
* Enable/disable callbacks for the specified connection
*
* Assumptions:
* This function is called user code. Interrupts may be enabled.
*
****************************************************************************/
void uip_udpenable(struct uip_udp_conn *conn)
{
/* Add the connection structure to the active connectionlist. This list
* is modifiable from interrupt level, we we must diable interrupts to
* access it safely.
*/
flags = irqsave();
irqstate_t flags = irqsave();
dq_addlast(&conn->node, &g_active_udp_connections);
irqrestore(flags);
}
return OK;
void uip_udpdisable(struct uip_udp_conn *conn)
{
/* Remove the connection structure to the active connectionlist. This list
* is modifiable from interrupt level, we we must diable interrupts to
* access it safely.
*/
irqstate_t flags = irqsave();
dq_rem(&conn->node, &g_active_udp_connections);
irqrestore(flags);
}
#endif /* CONFIG_NET && CONFIG_NET_UDP */

131
net/uip/uip-wait.c
View File

@ -1,131 +0,0 @@
/************************************************************
* uip-wait.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>
#include <semaphore.h>
#include <arch/irq.h>
#include <net/uip/uip.h>
/************************************************************
* Definitions
************************************************************/
/************************************************************
* Private Data
************************************************************/
/* Threads and tasks can both wait a semaphore. This
* initializer uses internal, non-portable knowledge of the\
* structure of sem_t to initialize it to the value 0.
*/
static sem_t uip_waitsem = { 0 }; /* Semaphore to wait on */
static uint16 uip_waitflags = 0; /* UIP flags to wait for */
/************************************************************
* Private Functions
************************************************************/
/************************************************************
* Global Functions
************************************************************/
/* This function is called user code to set up the wait */
int uip_event_wait(uint16 waitflags)
{
/* Prevent conflicts with the interrupt level operation of
* uip_event_signal().
*/
irqstate_t save = irqsave();
/* At present, we support only a single waiter. If uip_waitflags
* is non-zero on entry, then there is a problem.
*/
if ( uip_waitflags == 0)
{
/* If the requested event bits are not set in the uip_flags,
* then wait. We will be awakened as soon as an interrupt is
* received that sets these bits.
*/
goto errout_with_irqdisabled;
}
/* Loop until the requested bits are set in the flags */
while ((waitflags & uip_flags) != 0)
{
/* Set the event flags that the caller is waiting on */
uip_waitflags = waitflags;
/* Wait for the event to occur */
if (sem_wait(&uip_waitsem) != 0)
{
goto errout_with_irqdisabled;
}
}
irqrestore(save);
return OK;
errout_with_irqdisabled:
irqrestore(save);
return ERROR;
}
/* This function is called from uip_interrupt() to wake up any
* waiting threads/tasks.
*/
void uip_event_signal(void)
{
/* If any bits in uip_waitflags match bits set in uip_flags, then
* there must be a thread/task waiting for this event to occur.
*/
if ((uip_waitflags & uip_flags) != 0)
{
sem_post(&uip_waitsem); /* Post the event */
uip_waitflags = 0; /* Prohibit posting the event multiple times */
}
}

4
net/uip/uip.c
View File

@ -595,8 +595,6 @@ static void uip_add_rcv_nxt(uint16 n)
static void uip_udp_callback(void)
{
uip_event_signal();
/* Some sanity checking */
if (uip_udp_conn && uip_udp_conn->callback)
@ -609,8 +607,6 @@ static void uip_udp_callback(void)
static void uip_tcp_callback(void)
{
uip_event_signal();
/* Some sanity checking */
if (uip_conn && uip_conn->callback)