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/*
* Copyright 2006 Serge van den Boom <svdb@stack.nl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#define SOCKET_INTERNAL
#define NETDESCRIPTOR_INTERNAL
#include "netmanager_bsd.h"
#include "ndesc.h"
#include "../socket/socket.h"
#include "ndesc.h"
#include "types.h"
#include "libs/log.h"
#include <assert.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "netmanager_common.ci"
#include "ndindex.ci"
// INV: The following sets only contain sockets present in the netDescriptor
// array.
static fd_set readSet;
static fd_set writeSet;
static fd_set exceptionSet;
void
NetManager_init(void) {
NDIndex_init();
FD_ZERO(&readSet);
FD_ZERO(&writeSet);
FD_ZERO(&exceptionSet);
}
void
NetManager_uninit(void) {
NDIndex_uninit();
}
// Register the NetDescriptor with the NetManager.
int
NetManager_addDesc(NetDescriptor *nd) {
int fd;
assert(nd->socket != Socket_noSocket);
assert(!NDIndex_socketRegistered(nd->socket));
if (NDIndex_registerNDWithSocket(nd->socket, nd) == -1) {
// errno is set
return -1;
}
fd = nd->socket->fd;
if (nd->readCallback != NULL)
FD_SET(fd, &readSet);
if (nd->writeCallback != NULL)
FD_SET(fd, &writeSet);
if (nd->exceptionCallback != NULL)
FD_SET(fd, &exceptionSet);
return 0;
}
void
NetManager_removeDesc(NetDescriptor *nd) {
int fd;
assert(nd->socket != Socket_noSocket);
assert(NDIndex_getNDForSocket(nd->socket) == nd);
fd = nd->socket->fd;
FD_CLR(fd, &readSet);
FD_CLR(fd, &writeSet);
FD_CLR(fd, &exceptionSet);
NDIndex_unregisterNDForSocket(nd->socket);
}
void
NetManager_activateReadCallback(NetDescriptor *nd) {
FD_SET(nd->socket->fd, &readSet);
}
void
NetManager_deactivateReadCallback(NetDescriptor *nd) {
FD_CLR(nd->socket->fd, &readSet);
}
void
NetManager_activateWriteCallback(NetDescriptor *nd) {
FD_SET(nd->socket->fd, &writeSet);
}
void
NetManager_deactivateWriteCallback(NetDescriptor *nd) {
FD_CLR(nd->socket->fd, &writeSet);
}
void
NetManager_activateExceptionCallback(NetDescriptor *nd) {
FD_SET(nd->socket->fd, &exceptionSet);
}
void
NetManager_deactivateExceptionCallback(NetDescriptor *nd) {
FD_CLR(nd->socket->fd, &exceptionSet);
}
// This function may be called again from inside a callback function
// triggered by this function. BUG: This may result in callbacks being
// called multiple times.
// This function should however not be called from multiple threads at once.
int
NetManager_process(uint32 *timeoutMs) {
struct timeval timeout;
size_t i;
int selectResult;
fd_set newReadSet;
fd_set newWriteSet;
fd_set newExceptionSet;
bool bitSet;
timeout.tv_sec = *timeoutMs / 1000;
timeout.tv_usec = (*timeoutMs % 1000) * 1000;
// Structure assignment:
newReadSet = readSet;
newWriteSet = writeSet;
newExceptionSet = exceptionSet;
do {
selectResult = select(NDIndex_getSelectNumND(),
&newReadSet, &newWriteSet, &newExceptionSet, &timeout);
// BUG: If select() is restarted because of EINTR, the timeout
// may start over. (Linux changes 'timeout' to the time left,
// but most other platforms don't.)
} while (selectResult == -1 && errno == EINTR);
if (selectResult == -1) {
int savedErrno = errno;
log_add(log_Error, "select() failed: %s.", strerror(errno));
errno = savedErrno;
*timeoutMs = (timeout.tv_sec * 1000) + (timeout.tv_usec / 1000);
// XXX: rounding microseconds down. Is that the correct
// thing to do?
return -1;
}
for (i = 0; i < maxND; i++) {
NetDescriptor *nd;
if (selectResult == 0) {
// No more bits set in the fd_sets
break;
}
nd = NDIndex_getNDForSocketFd(i);
if (nd == NULL)
continue;
bitSet = false;
// Is one of the bits in the fd_sets set?
// A callback may cause a NetDescriptor to be closed. The deletion
// of the structure will be scheduled, but will still be
// available at least until this function returns.
if (FD_ISSET(i, &newExceptionSet))
{
bool closed;
bitSet = true;
closed = NetManager_doExceptionCallback(nd);
if (closed)
goto next;
}
if (FD_ISSET(i, &newWriteSet))
{
bool closed;
bitSet = true;
closed = NetManager_doWriteCallback(nd);
if (closed)
goto next;
}
if (FD_ISSET(i, &newReadSet))
{
bool closed;
bitSet = true;
closed = NetManager_doReadCallback(nd);
if (closed)
goto next;
}
next:
if (bitSet)
selectResult--;
}
*timeoutMs = (timeout.tv_sec * 1000) + (timeout.tv_usec / 1000);
// XXX: rounding microseconds down. Is that the correct
// thing to do?
return 0;
}
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