homeworkb3time2.c

在终端上显示当前日期和时间

#include<sys/time.h>
#include<signal.h>
#include<unistd.h>
#include<stdio.h>
#include<stdlib.h>
void init_time()
{
        struct itimerval value;
        value.it_value.tv_sec=1;
        value.it_value.tv_usec=0;
        value.it_interval.tv_sec=1;
        value.it_interval.tv_usec=0;
        setitimer(ITIMER_REAL,&value,NULL);
}
void displays(int dump)
{
        time_t t;
        struct tm *t2;
        char times[100];
        t2=localtime(&t);
        time(&t);
        strcpy(times,asctime(t2));
        printf("%s",times);
}
main()
{
        char c;
        void (*old_handler)(int);
        init_time();
        old_handler=signal(SIGALRM,displays);
        while(1)
        {
                getchar();
        }
        signal(SIGINT,old_handler);

}






/*#include <stdio.h>
#include <sys/time.h>

main()
{
     time_t t;
     struct tm *t2;
     char times[100];
     t2=localtime(&t);
     time(&t);
     strcpy(times,asctime(t2));
     printf("%s\n",times);
     return 0;
}*/