int socketGetInput(int sid, char *buf, int toRead, int *errCode)
{
struct sockaddr_in server;
socket_t *sp;
int len, bytesRead;
a_assert(buf);
a_assert(errCode);
*errCode = 0;
if ((sp = socketPtr(sid)) == NULL) {
return -1;
}
/*
* If we have previously seen an EOF condition, then just return
*/
if (sp->flags & SOCKET_EOF) {
return 0;
}
#if ((defined (WIN) || defined (CE)) && (!defined (LITTLEFOOT) && !defined (WEBS)))
if ( !(sp->flags & SOCKET_BLOCK)
&& ! socketWaitForEvent(sp, FD_CONNECT, errCode)) {
return -1;
}
#endif
/*
* Read the data
*/
if (sp->flags & SOCKET_DATAGRAM) {
len = sizeof(server);
bytesRead = recvfrom(sp->sock, buf, toRead, 0,
(struct sockaddr *) &server, &len);
} else {
bytesRead = recv(sp->sock, buf, toRead, 0);
}
/*
* BUG 01865 -- CPU utilization hangs on Windows. The original code used
* the 'errno' global variable, which is not set by the winsock functions
* as it is under *nix platforms. We use the platform independent
* socketGetError() function instead, which does handle Windows correctly.
* Other, *nix compatible platforms should work as well, since on those
* platforms, socketGetError() just returns the value of errno.
* Thanks to Jonathan Burgoyne for the fix.
*/
if (bytesRead < 0)
{
*errCode = socketGetError();
if (*errCode == ECONNRESET)
{
sp->flags |= SOCKET_CONNRESET;
return 0;
}
return -1;
}
return bytesRead;
}
static int socketDoOutput(socket_t *sp, char *buf, int toWrite, int *errCode)
{
struct sockaddr_in server;
int bytes;
a_assert(sp);
a_assert(buf);
a_assert(toWrite > 0);
a_assert(errCode);
*errCode = 0;
#if (defined (WIN) || defined (CE))
if ((sp->flags & SOCKET_ASYNC)
&& ! socketWaitForEvent(sp, FD_CONNECT, errCode)) {
return -1;
}
#endif
/*
* Write the data
*/
if (sp->flags & SOCKET_BROADCAST) {
server.sin_family = AF_INET;
server.sin_addr.s_addr = INADDR_BROADCAST;
server.sin_port = htons((short)(sp->port & 0xFFFF));
if ((bytes = sendto(sp->sock, buf, toWrite, 0,
(struct sockaddr *) &server, sizeof(server))) < 0) {
bytes = tryAlternateSendTo(sp->sock, buf, toWrite, 0,
(struct sockaddr *) &server);
}
} else if (sp->flags & SOCKET_DATAGRAM) {
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr(sp->host);
server.sin_port = htons((short)(sp->port & 0xFFFF));
bytes = sendto(sp->sock, buf, toWrite, 0,
(struct sockaddr *) &server, sizeof(server));
} else {
bytes = send(sp->sock, buf, toWrite, 0);
}
if (bytes < 0) {
*errCode = socketGetError();
#if (defined (WIN) || defined (CE))
sp->currentEvents &= ~FD_WRITE;
#endif
return -1;
} else if (bytes == 0 && bytes != toWrite) {
*errCode = EWOULDBLOCK;
#if (defined (WIN) || defined (CE))
sp->currentEvents &= ~FD_WRITE;
#endif
return -1;
}
return bytes;
}
int socketWrite(int sid, char *buf, int bufsize)
{
socket_t *sp;
ringq_t *rq;
int len, bytesWritten, room;
a_assert(buf);
a_assert(bufsize >= 0);
if ((sp = socketPtr(sid)) == NULL) {
return -1;
}
/*
* Loop adding as much data to the output ringq as we can absorb. Initiate a
* flush when the ringq is too full and continue. Block in socketFlush if the
* socket is in blocking mode.
*/
rq = &sp->outBuf;
for (bytesWritten = 0; bufsize > 0; ) {
if ((room = ringqPutBlkMax(rq)) == 0) {
if (socketFlush(sid) < 0) {
return -1;
}
if ((room = ringqPutBlkMax(rq)) == 0) {
if (sp->flags & SOCKET_BLOCK) {
#if (defined (WIN) || defined (CE))
int errCode;
if (! socketWaitForEvent(sp, FD_WRITE | SOCKET_WRITABLE,
&errCode)) {
return -1;
}
#endif
continue;
}
break;
}
continue;
}
len = min(room, bufsize);
ringqPutBlk(rq, (unsigned char *) buf, len);
bytesWritten += len;
bufsize -= len;
buf += len;
}
return bytesWritten;
}
static int socketDoOutput(socket_t *sp, char *buf, int toWrite, int *errCode)
{
struct sockaddr_in server;
int bytes;
a_assert(sp);
a_assert(buf);
a_assert(toWrite > 0);
a_assert(errCode);
*errCode = 0;
#if (defined (WIN) || defined (CE))
if ((sp->flags & SOCKET_ASYNC)
&& ! socketWaitForEvent(sp, FD_CONNECT, errCode)) {
return -1;
}
#endif
/*
* Write the data
*/
if (sp->flags & SOCKET_BROADCAST) {
server.sin_family = AF_INET;
#if (defined (UEMF) || defined (LITTLEFOOT))
server.sin_addr.s_addr = INADDR_BROADCAST;
#else
server.sin_addr.s_addr = inet_addr(basicGetBroadcastAddress());
#endif
server.sin_port = htons((short)(sp->port & 0xFFFF));
if ((bytes = sendto(sp->sock, buf, toWrite, 0,
(struct sockaddr *) &server, sizeof(server))) < 0) {
bytes = tryAlternateSendTo(sp->sock, buf, toWrite, 0,
(struct sockaddr *) &server);
}
} else if (sp->flags & SOCKET_DATAGRAM) {
server.sin_family = AF_INET;
server.sin_addr.s_addr = inet_addr(sp->host);
server.sin_port = htons((short)(sp->port & 0xFFFF));
bytes = sendto(sp->sock, buf, toWrite, 0,
(struct sockaddr *) &server, sizeof(server));
} else {
bytes = send(sp->sock, buf, toWrite, 0);
}
if (bytes < 0) {
*errCode = socketGetError();
#if (defined (WIN) || defined (CE))
sp->currentEvents &= ~FD_WRITE;
#endif
return -1;
} else if (bytes == 0 && bytes != toWrite) {
*errCode = EWOULDBLOCK;
#if (defined (WIN) || defined (CE))
sp->currentEvents &= ~FD_WRITE;
#endif
return -1;
}
/*
* Ensure we get to write some more data real soon if the socket can absorb
* more data
*/
#ifndef UEMF
#ifdef WIN
if (sp->interestEvents & FD_WRITE) {
emfTime_t blockTime = { 0, 0 };
emfSetMaxBlockTime(&blockTime);
}
#endif /* WIN */
#endif
return bytes;
}
int socketFlush(int sid)
{
socket_t *sp;
ringq_t *rq;
int len, bytesWritten, errCode;
if ((sp = socketPtr(sid)) == NULL) {
return -1;
}
rq = &sp->outBuf;
/*
* Set the background flushing flag which socketEventProc will check to
* continue the flush.
*/
if (! (sp->flags & SOCKET_BLOCK)) {
sp->flags |= SOCKET_FLUSHING;
}
/*
* Break from loop if not blocking after initiating output. If we are blocking
* we wait for a write event.
*/
while (ringqLen(rq) > 0) {
len = ringqGetBlkMax(&sp->outBuf);
bytesWritten = socketDoOutput(sp, (char*) rq->servp, len, &errCode);
if (bytesWritten < 0) {
if (errCode == EINTR) {
continue;
} else if (errCode == EWOULDBLOCK || errCode == EAGAIN) {
#if (defined (WIN) || defined (CE))
if (sp->flags & SOCKET_BLOCK) {
int errCode;
if (! socketWaitForEvent(sp, FD_WRITE | SOCKET_WRITABLE,
&errCode)) {
return -1;
}
continue;
}
#endif
/*
* Ensure we get a FD_WRITE message when the socket can absorb
* more data (non-blocking only.) Store the user's mask if we
* haven't done it already.
*/
if (sp->saveMask < 0 ) {
sp->saveMask = sp->handlerMask;
socketRegisterInterest(sp,
sp->handlerMask | SOCKET_WRITABLE);
}
return 0;
}
return -1;
}
ringqGetBlkAdj(rq, bytesWritten);
}
/*
* If the buffer is empty, reset the ringq pointers to point to the start
* of the buffer. This is essential to ensure that datagrams get written
* in one single I/O operation.
*/
if (ringqLen(rq) == 0) {
ringqFlush(rq);
}
/*
* Restore the users mask if it was saved by the non-blocking code above.
* Note: saveMask = -1 if empty. socketRegisterInterest will set handlerMask
*/
if (sp->saveMask >= 0) {
socketRegisterInterest(sp, sp->saveMask);
sp->saveMask = -1;
}
sp->flags &= ~SOCKET_FLUSHING;
return 0;
}