anytime

 #include<stdio.h>
 #include<stdlib.h>
 #include<unistd.h>
 #include<sys/time.h>
 #include<signal.h>
 #include<string.h>

 #define BUFMAX  1024

 static void alarm_handler(int s);

 static int init_mod;
 static struct sigaction oldact;
 typedef void (*anytm_t)(void *s);
 typedef struct myalarm{
     int sec;
     anytm_t anytm;
     //void (*anytm_t)(void *s);
     char * arg;
 }tim_t;
 static tim_t *buf[BUFMAX] = {};

 //关闭闹钟
 static void buf_break(void)
 {
     struct itimerval itv;
     sigaction(SIGALRM,&oldact,NULL);
     itv.it_interval.tv_sec = ;
     itv.it_interval.tv_usec = ;
     itv.it_value.tv_sec = ;
     itv.it_value.tv_usec = ;
     setitimer(ITIMER_REAL,&itv,NULL);
     init_mod = ;
 }

 static void func(void *s)
 {
     printf("%s",(char *)s);
     fflush(NULL);

 }

 static void alarm_init(void)
 {
     struct itimerval itv;
     itv.it_interval.tv_sec = ;
     itv.it_interval.tv_usec = ;
     itv.it_value.tv_sec = ;
     itv.it_value.tv_usec = ;

     struct sigaction act;
     act.sa_handler = alarm_handler;
     sigemptyset(&act.sa_mask);
     act.sa_flags = ;

     setitimer(ITIMER_REAL,&itv,NULL);
     sigaction(SIGALRM,&act,&oldact);
     init_mod = ;

 }
 static void alarm_handler(int s)
 {
     for(int i = ;i < ;i++)
     {
         if(buf[i] != NULL)
         {
             buf[i]->sec--;
             if(buf[i]->sec == )
             {
                 buf[i]->anytm(buf[i]->arg);
                 free(buf[i]);
                 buf[i] = NULL;
             }
         }
     }
 }

 static int time_init(int n,anytm_t anytm,void *p)
 {
     tim_t *t = NULL;
     int i;
     if(==init_mod)
         alarm_init();
     t = malloc(sizeof(tim_t) + strlen(p));
     if(t == NULL)
         return -;

     for(int i = ;i < BUFMAX;i++)
     {
         if(buf[i] == NULL)
         {
             break;
         }
     }
     t->sec = n;
     t->anytm = anytm;
     strcpy(t->arg,(char *)p);
     buf[i] = t;
     return i;

 }

 void anytime_destroy(void)
 {
     buf_break();
     for(int i = ;i < ;i++)
     {
         if(buf[i] != NULL)
         {
             free(buf[i]);
             buf[i] = NULL;
         }
     }
 }

 int main(void)
 {
     int i = ;

     time_init(,func,"hello");
     time_init(,func,"world");
     time_init(,func,"uplooking");

     while()
     {
         write(,"*",);
         sleep();
         i++;
         if(i == )
             anytime_destroy();

     }

     exit();
 }