NTP_GETTIME(2) System Calls NTP_GETTIME(2)


NAME


ntp_gettime - get local clock values

SYNOPSIS


#include <sys/timex.h>

int ntp_gettime(struct ntptimeval *tptr);


DESCRIPTION


The ntp_gettime() function reads the local clock value and dispersion,
returning the information in tptr.


The ntptimeval structure contains the following members:

struct ntptimeval {
struct timeval time; /* current time (ro) */
int32_t maxerror; /* maximum error (us) (ro) */
int32_t esterror; /* estimated error (us) (ro) */
};


RETURN VALUES


Upon successful completion, ntp_gettime() returns the current clock state
(see <sys/timex.h>). Otherwise, it returns -1 and sets errno to indicate
the error.

ERRORS


The ntp_gettime() function will fail if:

EFAULT
The tptr argument points to an invalid address.


The ntp_gettime() function will fail for 32-bit interfaces if:

EOVERFLOW
The size of the time.tv_sec member of the ntptimeval
structure pointed to by tptr is too small to contain the
correct number of seconds.


SEE ALSO


ntp_adjtime(2)


May 13, 2017 NTP_GETTIME(2)