【Linux学习】编写一个守护进程

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>

int main(void)
{
    pid_t pid;
    
    pid = fork();
    
    if(pid > 0)
    {
        exit(0);
    }
    
    if(0 == pid)
    {
        setsid();
        
        time_t now;      
        struct tm *timenow;
        
        while(1)
        {
            time(&now);
            timenow = localtime(&now);
            printf("localtime is:%s\n", asctime(timenow));
            
            sleep(3);
            
        }
        
    }
    

    return 0;
}