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/*
* Ivy, C interface
*
* Copyright (C) 1997-2000
* Centre d'Études de la Navigation Aérienne
*
* Main loop based on select
*
* Authors: François-Régis Colin <fcolin@cena.dgac.fr>
* Stéphane Chatty <chatty@cena.dgac.fr>
*
* $Id$
*
* Please refer to file version.h for the
* copyright notice regarding this software
*/
#ifdef WIN32
#include <windows.h>
#endif
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#ifndef WIN32
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <signal.h>
#endif
#include "list.h"
#include "ivychannel.h"
#include "ivyloop.h"
#include "timer.h"
struct _channel {
Channel next;
IVY_HANDLE fd;
void *data;
int tobedeleted;
ChannelHandleDelete handle_delete;
ChannelHandleRead handle_read;
ChannelHandleWrite handle_write;
};
static Channel channels_list = NULL;
static int channel_initialized = 0;
static fd_set open_fds;
static fd_set wrdy_fds;
static IVY_HANDLE highestFd=0;
static int MainLoop = 1;
/* Hook callback & data */
static IvyHookPtr BeforeSelect = NULL;
static IvyHookPtr AfterSelect = NULL;
static void *BeforeSelectData = NULL;
static void *AfterSelectData = NULL;
#ifdef WIN32
WSADATA WsaData;
#endif
void
IvyChannelRemove (Channel channel)
{
channel->tobedeleted = 1;
}
static void
IvyChannelDelete (Channel channel)
{
if (channel->handle_delete)
(*channel->handle_delete) (channel->data);
FD_CLR (channel->fd, &open_fds);
FD_CLR (channel->fd, &wrdy_fds);
IVY_LIST_REMOVE (channels_list, channel);
}
static void
ChannelDefferedDelete ()
{
Channel channel, next;
IVY_LIST_EACH_SAFE (channels_list, channel,next) {
if (channel->tobedeleted ) {
IvyChannelDelete (channel);
}
}
}
Channel IvyChannelAdd (IVY_HANDLE fd, void *data,
ChannelHandleDelete handle_delete,
ChannelHandleRead handle_read,
ChannelHandleWrite handle_write
)
{
Channel channel;
IVY_LIST_ADD_START (channels_list, channel)
channel->fd = fd;
channel->tobedeleted = 0;
channel->handle_delete = handle_delete;
channel->handle_read = handle_read;
channel->handle_write = handle_write;
channel->data = data;
if (channel->fd >= highestFd)
highestFd = channel->fd+1 ;
IVY_LIST_ADD_END (channels_list, channel)
FD_SET (channel->fd, &open_fds);
return channel;
}
void IvyChannelAddWritableEvent(Channel channel)
{
if (channel->fd >= highestFd)
highestFd = channel->fd+1 ;
FD_SET (channel->fd, &wrdy_fds);
}
void IvyChannelClearWritableEvent(Channel channel)
{
FD_CLR (channel->fd, &wrdy_fds);
}
static void
IvyChannelHandleWrite (fd_set *current)
{
Channel channel, next;
IVY_LIST_EACH_SAFE (channels_list, channel, next) {
if (FD_ISSET (channel->fd, current)) {
(*channel->handle_write)(channel,channel->fd,channel->data);
}
}
}
static void
IvyChannelHandleRead (fd_set *current)
{
Channel channel, next;
IVY_LIST_EACH_SAFE (channels_list, channel, next) {
if (FD_ISSET (channel->fd, current)) {
(*channel->handle_read)(channel,channel->fd,channel->data);
}
}
}
static void
IvyChannelHandleExcpt (fd_set *current)
{
Channel channel,next;
IVY_LIST_EACH_SAFE (channels_list, channel, next) {
if (FD_ISSET (channel->fd, current)) {
if (channel->handle_delete)
(*channel->handle_delete)(channel->data);
/* IvyChannelClose (channel); */
}
}
}
void IvyChannelInit (void)
{
#ifdef WIN32
int error;
#else
/* pour eviter les plantages quand les autres applis font core-dump */
signal (SIGPIPE, SIG_IGN);
#endif
MainLoop = 1;
if (channel_initialized) return;
FD_ZERO (&open_fds);
FD_ZERO (&wrdy_fds);
#ifdef WIN32
error = WSAStartup (0x0101, &WsaData);
if (error == SOCKET_ERROR) {
printf ("WSAStartup failed.\n");
}
#endif
channel_initialized = 1;
}
void IvyChannelStop (void)
{
MainLoop = 0;
}
void IvyMainLoop(void)
{
fd_set rdset, exset, wrset;
int ready;
while (MainLoop) {
ChannelDefferedDelete();
if (BeforeSelect)
(*BeforeSelect)(BeforeSelectData);
rdset = open_fds;
wrset = wrdy_fds;
exset = open_fds;
ready = select(highestFd, &rdset, &wrset, &exset,
TimerGetSmallestTimeout());
if (AfterSelect)
(*AfterSelect)(AfterSelectData);
if (ready < 0 && (errno != EINTR)) {
fprintf (stderr, "select error %d\n",errno);
perror("select");
return;
}
TimerScan(); /* should be spliited in two part ( next timeout & callbacks */
if (ready > 0) {
IvyChannelHandleExcpt(&exset);
IvyChannelHandleRead(&rdset);
IvyChannelHandleWrite(&wrset);
}
}
}
void IvyIdle()
{
fd_set rdset, exset, wrset;
int ready;
struct timeval timeout = {0,0};
ChannelDefferedDelete();
rdset = open_fds;
wrset = wrdy_fds;
exset = open_fds;
ready = select(highestFd, &rdset, &wrset, &exset, &timeout);
if (ready < 0 && (errno != EINTR)) {
fprintf (stderr, "select error %d\n",errno);
perror("select");
return;
}
if (ready > 0) {
IvyChannelHandleExcpt(&exset);
IvyChannelHandleRead(&rdset);
IvyChannelHandleWrite(&wrset);
}
}
void IvySetBeforeSelectHook(IvyHookPtr before, void *data )
{
BeforeSelect = before;
BeforeSelectData = data;
}
void IvySetAfterSelectHook(IvyHookPtr after, void *data )
{
AfterSelect = after;
AfterSelectData = data;
}
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