libevent库的使用--定时器的使用实例

#defineRELOAD_TIMEOUT5
#defineDEFAULT_FILE"sample.html"

char*filedata;
time_tlasttime=0;
charfilename[80];
intcounter=0;

voidread_file()
{
 intsize=0;
 char*data;
 structstatbuf;

 stat(filename,&buf);

 if(buf.st_mtime>lasttime)
   {
     if(counter++)
       fprintf(stderr,"Reloadingfile:%s",filename);
     else
       fprintf(stderr,"Loadingfile:%s",filename);

     FILE*f=fopen(filename,"rb");
     if(f==NULL)
       {
         fprintf(stderr,"Couldn"topenfile\n");
         exit(1);
       }

     fseek(f,0,SEEK_END);
     size=ftell(f);
     fseek(f,0,SEEK_SET);
     data=(char*)malloc(size+1);
     fread(data,sizeof(char),size,f);
     filedata=(char*)malloc(size+1);
     strcpy(filedata,data);
     fclose(f);

     fprintf(stderr,"(%dbytes)\n",size);
     lasttime=buf.st_mtime;
   }
}

voidload_file()
{
 structevent*loadfile_event;
 structtimevaltv;

 read_file();

 tv.tv_sec=RELOAD_TIMEOUT;
 tv.tv_usec=0;

 loadfile_event=malloc(sizeof(structevent));

 evtimer_set(loadfile_event,
             load_file,
             loadfile_event);

 evtimer_add(loadfile_event,
             &tv);
}

voidgeneric_request_handler(structevhttp_request*req,void*arg)
{
 structevbuffer*evb=evbuffer_new();

 evbuffer_add_printf(evb,"%s",filedata);
 evhttp_send_reply(req,HTTP_OK,"Client",evb);
 evbuffer_free(evb);
}

intmain(intargc,char*argv[])
{
 short         http_port=8081;
 char         *http_addr="192.168.0.22";
 structevhttp*http_server=NULL;

 if(argc>1)
   {
     strcpy(filename,argv[1]);
     printf("Using%s\n",filename);
   }
 else
   {
     strcpy(filename,DEFAULT_FILE);
   }

 event_init();

 load_file();

 http_server=evhttp_start(http_addr,http_port);
 evhttp_set_gencb(http_server,generic_request_handler,NULL);

 fprintf(stderr,"Serverstartedonport%d\n",http_port);
 event_dispatch();
}