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fixed bug #31084 (socket API returns always EMSGSIZE on non-blocking sockets if data size > send buffers) -> now lwip_send() sends as much as possible for non-blocking sockets and only returns EWOULDBLOCK if the buffers are full

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This commit is contained in:
Simon Goldschmidt 2011-07-22 22:05:24 +02:00
parent 6323e09a0a
commit 46af0d38fa
5 changed files with 81 additions and 63 deletions
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5
CHANGELOG
View File

@ -37,6 +37,11 @@ HISTORY
++ Bugfixes:
2011-07-22: Simon Goldschmidt
* api_lib.c, api_msg.c, sockets.c, api.h: fixed bug #31084 (socket API returns
always EMSGSIZE on non-blocking sockets if data size > send buffers) -> now
lwip_send() sends as much as possible for non-blocking sockets
2011-07-22: Simon Goldschmidt
* pbuf.c/.h, timers.c: freeing ooseq pbufs when the pbuf pool is empty implemented
for NO_SYS==1: when not using sys_check_timeouts(), call PBUF_CHECK_FREE_OOSEQ()

23
src/api/api_lib.c
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@ -582,22 +582,30 @@ netconn_send(struct netconn *conn, struct netbuf *buf)
* - NETCONN_COPY: data will be copied into memory belonging to the stack
* - NETCONN_MORE: for TCP connection, PSH flag will be set on last segment sent
* - NETCONN_DONTBLOCK: only write the data if all dat can be written at once
* @param bytes_written pointer to a location that receives the number of written bytes
* @return ERR_OK if data was sent, any other err_t on error
*/
err_t
netconn_write(struct netconn *conn, const void *dataptr, size_t size, u8_t apiflags)
netconn_write_partly(struct netconn *conn, const void *dataptr, size_t size,
u8_t apiflags, size_t *bytes_written)
{
struct api_msg msg;
err_t err;
u8_t dontblock;
LWIP_ERROR("netconn_write: invalid conn", (conn != NULL), return ERR_ARG;);
LWIP_ERROR("netconn_write: invalid conn->type", (NETCONNTYPE_GROUP(conn->type)== NETCONN_TCP), return ERR_VAL;);
if (size == 0) {
return ERR_OK;
}
dontblock = netconn_is_nonblocking(conn) || (apiflags & NETCONN_DONTBLOCK);
if (dontblock && !bytes_written) {
/* This implies netconn_write() cannot be used for non-blocking send, since
it has no way to return the number of bytes written. */
return ERR_VAL;
}
/* @todo: for non-blocking write, check if 'size' would ever fit into
snd_queue or snd_buf */
/* non-blocking write sends as much */
msg.function = do_write;
msg.msg.conn = conn;
msg.msg.msg.w.dataptr = dataptr;
@ -607,6 +615,15 @@ netconn_write(struct netconn *conn, const void *dataptr, size_t size, u8_t apifl
but if it is, this is done inside api_msg.c:do_write(), so we can use the
non-blocking version here. */
err = TCPIP_APIMSG(&msg);
if ((err == ERR_OK) && (bytes_written != NULL)) {
if (dontblock) {
/* nonblocking write: maybe the data has been sent partly */
*bytes_written = msg.msg.msg.w.len;
} else {
/* blocking call succeeded: all data has been sent if it */
*bytes_written = size;
}
}
NETCONN_SET_SAFE_ERR(conn, err);
return err;

94
src/api/api_msg.c
View File

@ -1198,7 +1198,7 @@ do_recv(struct api_msg_msg *msg)
static err_t
do_writemore(struct netconn *conn)
{
err_t err = ERR_OK;
err_t err;
void *dataptr;
u16_t len, available;
u8_t write_finished = 0;
@ -1229,62 +1229,62 @@ do_writemore(struct netconn *conn)
if (available < len) {
/* don't try to write more than sendbuf */
len = available;
if (dontblock){
if (!len) {
err = ERR_WOULDBLOCK;
goto err_mem;
}
} else {
#if LWIP_TCPIP_CORE_LOCKING
conn->flags |= NETCONN_FLAG_WRITE_DELAYED;
conn->flags |= NETCONN_FLAG_WRITE_DELAYED;
#endif
apiflags |= TCP_WRITE_FLAG_MORE;
apiflags |= TCP_WRITE_FLAG_MORE;
}
}
if (dontblock && (len < conn->current_msg->msg.w.len)) {
/* failed to send all data at once -> nonblocking write not possible */
err = ERR_MEM;
}
if (err == ERR_OK) {
LWIP_ASSERT("do_writemore: invalid length!", ((conn->write_offset + len) <= conn->current_msg->msg.w.len));
err = tcp_write(conn->pcb.tcp, dataptr, len, apiflags);
}
if (dontblock && (err == ERR_MEM)) {
/* nonblocking write failed */
write_finished = 1;
err = ERR_WOULDBLOCK;
/* let poll_tcp check writable space to mark the pcb
writable again */
conn->flags |= NETCONN_FLAG_CHECK_WRITESPACE;
/* let select mark this pcb as non-writable. */
API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
} else {
/* if OK or memory error, check available space */
if (((err == ERR_OK) || (err == ERR_MEM)) &&
((tcp_sndbuf(conn->pcb.tcp) <= TCP_SNDLOWAT) ||
(tcp_sndqueuelen(conn->pcb.tcp) >= TCP_SNDQUEUELOWAT))) {
LWIP_ASSERT("do_writemore: invalid length!", ((conn->write_offset + len) <= conn->current_msg->msg.w.len));
err = tcp_write(conn->pcb.tcp, dataptr, len, apiflags);
/* if OK or memory error, check available space */
if ((err == ERR_OK) || (err == ERR_MEM)) {
err_mem:
if (dontblock && (len < conn->current_msg->msg.w.len)) {
/* non-blocking write did not write everything: mark the pcb non-writable
and let poll_tcp check writable space to mark the pcb writable again */
API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
conn->flags |= NETCONN_FLAG_CHECK_WRITESPACE;
} else if ((tcp_sndbuf(conn->pcb.tcp) <= TCP_SNDLOWAT) ||
(tcp_sndqueuelen(conn->pcb.tcp) >= TCP_SNDQUEUELOWAT)) {
/* The queued byte- or pbuf-count exceeds the configured low-water limit,
let select mark this pcb as non-writable. */
API_EVENT(conn, NETCONN_EVT_SENDMINUS, len);
}
}
if (err == ERR_OK) {
conn->write_offset += len;
if (conn->write_offset == conn->current_msg->msg.w.len) {
/* everything was written */
write_finished = 1;
conn->write_offset = 0;
}
tcp_output(conn->pcb.tcp);
} else if (err == ERR_MEM) {
/* If ERR_MEM, we wait for sent_tcp or poll_tcp to be called
we do NOT return to the application thread, since ERR_MEM is
only a temporary error! */
/* tcp_write returned ERR_MEM, try tcp_output anyway */
tcp_output(conn->pcb.tcp);
#if LWIP_TCPIP_CORE_LOCKING
conn->flags |= NETCONN_FLAG_WRITE_DELAYED;
#endif
} else {
/* On errors != ERR_MEM, we don't try writing any more but return
the error to the application thread. */
if (err == ERR_OK) {
conn->write_offset += len;
if ((conn->write_offset == conn->current_msg->msg.w.len) || dontblock) {
/* return sent length */
conn->current_msg->msg.w.len = conn->write_offset;
/* everything was written */
write_finished = 1;
conn->write_offset = 0;
}
tcp_output(conn->pcb.tcp);
} else if ((err == ERR_MEM) && !dontblock) {
/* If ERR_MEM, we wait for sent_tcp or poll_tcp to be called
we do NOT return to the application thread, since ERR_MEM is
only a temporary error! */
/* tcp_write returned ERR_MEM, try tcp_output anyway */
tcp_output(conn->pcb.tcp);
#if LWIP_TCPIP_CORE_LOCKING
conn->flags |= NETCONN_FLAG_WRITE_DELAYED;
#endif
} else {
/* On errors != ERR_MEM, we don't try writing any more but return
the error to the application thread. */
write_finished = 1;
conn->current_msg->msg.w.len = 0;
}
if (write_finished) {

16
src/api/sockets.c
View File

@ -805,6 +805,7 @@ lwip_send(int s, const void *data, size_t size, int flags)
struct lwip_sock *sock;
err_t err;
u8_t write_flags;
size_t written;
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d, data=%p, size=%"SZT_F", flags=0x%x)\n",
s, data, size, flags));
@ -823,22 +824,15 @@ lwip_send(int s, const void *data, size_t size, int flags)
#endif /* (LWIP_UDP || LWIP_RAW) */
}
if ((flags & MSG_DONTWAIT) || netconn_is_nonblocking(sock->conn)) {
if ((size > TCP_SND_BUF) || ((size / TCP_MSS) > TCP_SND_QUEUELEN)) {
/* too much data to ever send nonblocking! */
sock_set_errno(sock, EMSGSIZE);
return -1;
}
}
write_flags = NETCONN_COPY |
((flags & MSG_MORE) ? NETCONN_MORE : 0) |
((flags & MSG_DONTWAIT) ? NETCONN_DONTBLOCK : 0);
err = netconn_write(sock->conn, data, size, write_flags);
written = 0;
err = netconn_write_partly(sock->conn, data, size, write_flags, &written);
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d) err=%d size=%"SZT_F"\n", s, err, size));
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d) err=%d written=%"SZT_F"\n", s, err, written));
sock_set_errno(sock, err_to_errno(err));
return (err == ERR_OK ? (int)size : -1);
return (err == ERR_OK ? (int)written : -1);
}
int

6
src/include/lwip/api.h
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@ -250,8 +250,10 @@ void netconn_recved(struct netconn *conn, u32_t length);
err_t netconn_sendto(struct netconn *conn, struct netbuf *buf,
ip_addr_t *addr, u16_t port);
err_t netconn_send(struct netconn *conn, struct netbuf *buf);
err_t netconn_write(struct netconn *conn, const void *dataptr, size_t size,
u8_t apiflags);
err_t netconn_write_partly(struct netconn *conn, const void *dataptr, size_t size,
u8_t apiflags, size_t *bytes_written);
#define netconn_write(conn, dataptr, size, apiflags) \
netconn_write_partly(conn, dataptr, size, apiflags, NULL)
err_t netconn_close(struct netconn *conn);
err_t netconn_shutdown(struct netconn *conn, u8_t shut_rx, u8_t shut_tx);