Qp0zGetTimeofDay()--Get Current Software Clock Time
Syntax
#include <sys/time.h>
int Qp0zGetTimeofDay (struct timeval *tp,
struct timezone *tzp);
Service Program Name: QP0ZCPA
Default Public Authority: *USE
Threadsafe: Yes
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
| 0 | Qp0zGetTimeofDay() was
successful. |
| -1 | Qp0zGetTimeofDay() was not successful. The errno variable is set to indicate the error. |
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.
| [EINVAL] | An invalid parameter was found.
A parameter passed to this function is not valid. |
| [EFAULT] | The address used for an argument is not correct.
In attempting to use an argument in a call, the system detected an address that is not valid. While attempting to access a parameter passed to this function, the system detected an address that is not valid. |
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
The following example gets the current software clock time.
Note: By using the code examples, you agree to the terms of the Code license and disclaimer information.
#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
API introduced: V5R3