Qp0zGetTimeofDay()--Get Current Software Clock Time

 #include <sys/time.h>

 int Qp0zGetTimeofDay (struct timeval *tp,
                       struct timezone *tzp);

The Qp0zGetTimeofDay() function retrieves the current software clock time and places it in the timeval structure pointed to by tp. If tzp is not NULL, the time zone information is returned in the timezone structure pointed to by tzp.

The software clock maintains a time that can be set independently of the system clock. It is not integrated with the system and will be removed in a future release. The gettimeofday() function should be used instead.

Parameters

tp

(Output) A pointer to a timeval structure that contains the time in seconds and microseconds since 1 January 1970, 00:00:00 UTC (epoch-1970).

tzp

(Output) A pointer to a timezone structure that contains the local time zone (measured in minutes west of Greenwich) and a flag that, if nonzero, indicates daylight saving time applies locally during the appropriate part of the year.

Authorities and Locks

None

Return Value

Error Conditions

If Qp0zGetTimeofDay() is not successful, errno usually indicates one of the following errors. Under some conditions, errno could indicate an error other than those listed here.

Error Messages

None.

Usage Notes

• For the best performance, specify NULL for the tzp parameter.
• If the value of the environment variable QIBM_USE_SFWCLK is "N", Qp0zGetTimeofDay() calls gettimeofday() to get the current UTC time from the system clock.

Related Information

• The <sys/time.h> file (see Header Files for UNIX-Type Functions)
  
  
• gettimeofday()--Get Current UTC Time
  
  
• Qp0zAdjTime()--Adjust Software Clock
  
  
• Qp0zSetTimeofDay()--Set Software Clock

Example

See Code disclaimer information for information pertaining to code examples.

The following example gets the current software clock time:

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

int main(int argc, char *argv[])
{
    struct timeval now;
    int rc;

    rc=Qp0zGetTimeofDay(&now, NULL);
    if(rc==0) {
        printf("Qp0zGetTimeofDay() successful.\n");
        printf("time = %u.%06u\n",
                now.tv_sec, now.tv_usec);
    }
    else {
        printf("Qp0zGetTimeofDay() failed, errno = %d\n",
                errno);
        return -1;
    }

    return 0;
}

Example Output:

Qp0zGetTimeofDay() successful.
time = 866208142.290944