NAME

setclock − set value of system-wide clock

SYNOPSIS

#include <sys/timers.h>

int setclock(int clock_type, struct timespec *tp);

DESCRIPTION

setclock() sets the current value tp of the specified system-wide clock, clock_type.

setclock() supports a clock_type of TIMEOFDAY, defined in <sys/timers.h>, which represents the time-of-day clock for the system.  For this clock, the values returned by setclock() represent the amount of time since the Epoch. 

The calling process must have appropriate privileges to set the TIMEOFDAY clock. 

RETURN VALUE

setclock() returns a value of zero if successful; otherwise it returns −1 and sets errno to indicate the error. 

ERRORS

setclock() fails if any of the following conditions are encountered:

[EINVAL] clock_type does not specify a known system-wide clock, or tp either is outside the range for a given clock type, or specifies a nanosecond value less than zero or greater than or equal to 1000 million. 

[EIO] An error occurred while accessing the clock device

[EPERM] The requesting process does not have the required appropriate privileges to set the specified clock. 

SEE ALSO

gettimer(3C), getclock(3C), <sys/timers.h>

STANDARDS CONFORMANCE

setclock(): AES

Hewlett-Packard Company  —  HP-UX Release 9.0: August 1992