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//
// Event Dispatcher Abstraction for EPOLL
//
// Author: Florian Wilkemeyer <fw@f-ws.de>
//
// Copyright (c) rAthena Project (www.rathena.org) - Licensed under GNU GPL
// For more information, see LICENCE in the main folder
//
//
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <sys/fcntl.h>
#include <sys/socket.h>
#include "../common/cbasetypes.h"
#include "../common/showmsg.h"
#include "../common/evdp.h"
#define EPOLL_MAX_PER_CYCLE 10 // Max Events to coalesc. per cycle.
static int epoll_fd = -1;
void evdp_init(){
epoll_fd = epoll_create( EPOLL_MAX_PER_CYCLE );
if(epoll_fd == -1){
ShowFatalError("evdp [EPOLL]: Cannot create event dispatcher (errno: %u / %s)\n", errno, strerror(errno) );
exit(1);
}
}//end: evdp_init()
void evdp_final(){
if(epoll_fd != -1){
close(epoll_fd);
epoll_fd = -1;
}
}//end: evdp_final()
int32 evdp_wait(EVDP_EVENT *out_fds, int32 max_events, int32 timeout_ticks){
struct epoll_event l_events[EPOLL_MAX_PER_CYCLE];
register struct epoll_event *ev;
register int nfds, n;
if(max_events > EPOLL_MAX_PER_CYCLE)
max_events = EPOLL_MAX_PER_CYCLE;
nfds = epoll_wait( epoll_fd, l_events, max_events, timeout_ticks);
if(nfds == -1){
// @TODO: check if core is in shutdown mode. if - ignroe error.
ShowFatalError("evdp [EPOLL]: epoll_wait returned bad / unexpected status (errno: %u / %s)\n", errno, strerror(errno));
exit(1); //..
}
// Loop thru all events and copy it to the local ra evdp_event.. struct.
for(n = 0; n < nfds; n++){
ev = &l_events[n];
out_fds->fd = ev->data.fd;
out_fds->events = 0; // clear
if(ev->events & EPOLLHUP)
out_fds->events |= EVDP_EVENT_HUP;
if(ev->events & EPOLLIN)
out_fds->events |= EVDP_EVENT_IN;
if(ev->events & EPOLLOUT)
out_fds->events |= EVDP_EVENT_OUT;
out_fds++;
}
return nfds; // 0 on timeout or > 0 ..
}//end: evdp_wait()
void evdp_remove(int32 fd, EVDP_DATA *ep){
if(ep->ev_added == true){
if( epoll_ctl(epoll_fd, EPOLL_CTL_DEL, fd, &ep->ev_data) != 0){
ShowError("evdp [EPOLL]: evdp_remove - epoll_ctl (EPOLL_CTL_DEL) failed! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
}
ep->ev_data.events = 0; // clear struct.
ep->ev_data.data.fd = -1; // .. clear struct ..
ep->ev_added = false; // not added!
}
}//end: evdp_remove()
bool evdp_addlistener(int32 fd, EVDP_DATA *ep){
ep->ev_data.events = EPOLLET|EPOLLIN;
ep->ev_data.data.fd = fd;
// No check here for 'added ?'
// listeners cannot be added twice.
//
if( epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ep->ev_data) != 0 ){
ShowError("evdp [EPOLL]: evdp_addlistener - epoll_ctl (EPOLL_CTL_ADD) faield! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
ep->ev_data.events = 0;
ep->ev_data.data.fd = -1;
return false;
}
ep->ev_added = true;
return true;
}//end: evdp_addlistener()
bool evdp_addclient(int32 fd, EVDP_DATA *ep){
ep->ev_data.events = EPOLLIN | EPOLLHUP;
ep->ev_data.data.fd = fd;
// No check for "added?" here,
// this function only gets called upon accpept.
//
if( epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ep->ev_data) != 0){
ShowError("evdp [EPOLL]: evdp_addclient - epoll_ctl (EPOLL_CTL_ADD) failed! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
ep->ev_data.events = 0;
ep->ev_data.data.fd = -1;
return false;
}
ep->ev_added = true;
return true;
}//end: evdp_addclient()
bool evdp_addconnecting(int32 fd, EVDP_DATA *ep){
ep->ev_data.events = EPOLLET | EPOLLOUT | EPOLLHUP;
ep->ev_data.data.fd = fd;
if( epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ep->ev_data) != 0){
ShowError("evdp [EPOLL]: evdp_addconnecting - epoll_ctl (EPOLL_CTL_ADD) failed! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
ep->ev_data.events = 0;
ep->ev_data.data.fd = -1;
}
ep->ev_added = true;
return true;
}//end: evdp_addconnecting()
bool evdp_outgoingconnection_established(int32 fd, EVDP_DATA *ep){
int32 saved_mask;
if(ep->ev_added != true){
// !
ShowError("evdp [EPOLL]: evdp_outgoingconnection_established fd #%u is not added to event dispatcher! invalid call.\n", fd);
return false;
}
saved_mask = ep->ev_data.events;
ep->ev_data.events = EPOLLIN | EPOLLHUP;
if( epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fd, &ep->ev_data) != 0){
ep->ev_data.events = saved_mask; // restore old mask.
ShowError("evdp [EPOLL]: evdp_outgoingconnection_established - epoll_ctl (EPOLL_CTL_MOD) failed! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
return false;
}
return true;
}//end: evdp_outgoingconnection_established()
bool evdp_writable_add(int32 fd, EVDP_DATA *ep){
if(ep->ev_added != true){
ShowError("evdp [EPOLL]: evdp_writable_add - tried to add not added fd #%u\n",fd);
return false;
}
if(! (ep->ev_data.events & EPOLLOUT) ){ //
ep->ev_data.events |= EPOLLOUT;
if( epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fd, &ep->ev_data) != 0 ){
ShowError("evdp [EPOLL]: evdp_writable_add - epoll_ctl (EPOLL_CTL_MOD) failed! fd #%u (errno: %u / %s)\n", fd, errno, strerror(errno));
ep->ev_data.events &= ~EPOLLOUT; // remove from local flagmask due to failed syscall.
return false;
}
}
return true;
}//end: evdp_writable_add()
void evdp_writable_remove(int32 fd, EVDP_DATA *ep){
if(ep->ev_added != true){
ShowError("evdp [EPOLL]: evdp_writable_remove - tried to remove not added fd #%u\n", fd);
return;
}
if( ep->ev_data.events & EPOLLOUT ){
ep->ev_data.events &= ~EPOLLOUT;
if( epoll_ctl(epoll_fd, EPOLL_CTL_MOD, fd, &ep->ev_data) != 0){
ShowError("evdp [EPOLL]: evdp_writable_remove - epoll_ctl (EPOLL_CTL_MOD) failed! fd #%u (errno %u / %s)\n", fd, errno, strerror(errno));
ep->ev_data.events |= EPOLLOUT; // add back to local flagmask because of failed syscall.
return;
}
}
return;
}//end: evdp_writable_remove()
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