Minix current time

Question

How to write current time in printf on Minix 3.2.1?
I try to use gmtime like below but it gives error on time(&nowtime).

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

struct tm *now;
time_t nowtime;
time(&nowtime);
now=gmtime(&nowtime);

printf("TIME is NOW %s",now);

Moreover, I try to recall that in kernel (/usr/src/kernel/main.c) because I need that time on the booting of minix to say when the kernel process is finished and switch to user.

I take some errors on above code like when rebuild the kernel like below;

Answer 1

Not that familiar with minix, but it is similar to Unix & Linux, so maybe something from that platform may be present on minix... so A couple of approaches

• Run a man on ctime

• the man page on Linux's time() command contains this example code (which you may have to modify for minix, but it shows how to use asctime() localtime() and time() ):

    #include <stdio.h>
    #include <time.h>
  
    int main(void)
    {
        time_t result;
  
        result = time(NULL);
        printf("%s%ju secs since the Epoch\n",
            asctime(localtime(&result)),
                (uintmax_t)result);
        return(0);
    }