AMC dimPCI 68VZ328 Manual do Utilizador descarregar pdf (Página 51)

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}

This program will read the date from the kernel clock and print it out to the standard output

stream.

// date.c

// This will read the date from the realtime clock and

// display it on screen.

#include <stdio.h>

#include <sys/time.h>

#include <unistd.h>

void main() {

struct timeval time_val;

// read the date from the realtime clock

gettimeofday(&time_val, NULL);

// display the value from the clock

printf(“%s”, ctime((time_t *) &time_val.tv_sec));

}

The following program writes a given date to the kernel clock and then commits it to the hard-

ware real-time clock.

// rtc.c

// This program will first set the date on the real time clock

// Fri May 25 10:21:00 2001 and then read it back and display

it.

#include <stdio.h>

#include <sys/time.h>

#include <unistd.h>

void main ()

{

struct timeval time_val;

struct tm tm_val;

// load the time we are setting into the time structure

tm_val.tm_sec = 0;

tm_val.tm_min = 21;

tm_val.tm_hour = 10;

tm_val.tm_mday = 25;

tm_val.tm_mon = 4;

tm_val.tm_year = 2001 - 1900;

tm_val.tm_wday = 5;

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