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#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <signal.h>
#include <sys/select.h>
#include <sys/time.h>
#include "runloop.h"
#include "util.h"
struct fd_list_item{
int fd;
runloop_callback *func;
i64 last_activity; // -1 if timeout is not enabled
};
static struct fd_list_item *fd_list;
static size_t fd_list_len,fd_list_cap;
static i64 timeout_usecs=0;
static runloop_callback *timeout_callback=NULL;
static bool sigint_received=false;
static void signal_handler(int sig){
if(sig==SIGINT){
sigint_received=true;
}
}
__attribute__((constructor))
static void constructor(void){
fd_list_cap=16;
fd_list_len=0;
fd_list=malloc(fd_list_cap,struct fd_list_item);
signal(SIGINT,signal_handler);
}
void runloop_set_timeout(i64 usecs,runloop_callback *cb){
timeout_usecs=usecs;
timeout_callback=cb;
}
void runloop_add_fd(int fd,runloop_callback *func,bool use_timeout){
if(fd_list_len==fd_list_cap){
fd_list_cap*=2;
fd_list=realloc(fd_list,fd_list_cap,struct fd_list_item);
}
fd_list[fd_list_len].fd=fd;
fd_list[fd_list_len].func=func;
fd_list[fd_list_len].last_activity=use_timeout ? make_timestamp() : -1;
fd_list_len++;
}
void runloop_run(void){
while(fd_list_len>0){
if(sigint_received){
printf("runloop: SIGINT received\n");
break;
}
fd_set inset;
FD_ZERO(&inset);
int maxfd=-1;
i64 oldest_timestamp=-1;
int oldest_at=-1;
for(size_t i=0;i<fd_list_len;i++){
FD_SET(fd_list[i].fd,&inset);
if(fd_list[i].fd>maxfd)maxfd=fd_list[i].fd;
if(fd_list[i].last_activity!=-1&&
(oldest_timestamp==-1||fd_list[i].last_activity<oldest_timestamp)){
oldest_timestamp=fd_list[i].last_activity;
oldest_at=i;
}
}
struct timeval tv={.tv_sec=0,.tv_usec=0};
struct timeval *tv_ptr=NULL;
if(timeout_usecs>0&&timeout_callback!=NULL&&oldest_timestamp!=-1){
i64 chosen_timeout=timeout_usecs-(make_timestamp()-oldest_timestamp);
if(chosen_timeout<0)chosen_timeout=0;
tv.tv_sec=chosen_timeout/1000000;
tv.tv_usec=chosen_timeout%1000000;
tv_ptr=&tv;
}
int ret=select(maxfd+1,&inset,NULL,NULL,tv_ptr);
if(ret==0){
fd_list[oldest_at].last_activity=make_timestamp();
if(timeout_callback(fd_list[oldest_at].fd)){
memmove(fd_list+oldest_at,fd_list+oldest_at+1,
(fd_list_len-oldest_at-1)*sizeof(struct fd_list_item));
fd_list_len--;
}
continue;
}
if(ret<0){
if(errno==EINTR)continue; // SIGINT goes here
die_perror("select");
}
for(size_t i=0;i<fd_list_len;i++){
if(FD_ISSET(fd_list[i].fd,&inset)){
if(fd_list[i].last_activity!=-1){
fd_list[i].last_activity=make_timestamp();
}
if(fd_list[i].func(fd_list[i].fd)){
memmove(fd_list+i,fd_list+i+1,(fd_list_len-i-1)*sizeof(struct fd_list_item));
i--;
fd_list_len--;
}
}
}
}
}
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