Man page of setclock
Section: C Library Functions (3)
Return to Main Contents
setclock - Sets value of system-wide clock
Standard C Library (libc.a)
struct timespec *val) ;
a system-wide clock whose symbolic name must be TIMEOFDAY.
Points to the location where the value of the time to set into the
clock specified by the clktyp parameter is stored.
The setclock() function sets a time value into
the system-wide clock whose symbolic name is specified by the
clktyp parameter, which must be
TIMEOFDAY, defined in the
sys/timers.h header file.
The source of the current value of time set into the system-wide
time-of-day clock by this function is stored in space reserved by a
type timespec structure pointed to by the val parameter. This
time information is the amount of time since the epoch. The epoch is
referenced to 00:00:00 GMT (Greenwich Mean Time) 1 Jan 1970. The
timespec structure, which is also defined in the
sys/timers.h header file has the following members:
|unsigned long||tv_sec||Time of day since the epoch in seconds.|
Time of day fraction of a second (expressed in nanoseconds).
Upon successful completion,
the setclock() function returns a value of 0 (zero).
Otherwise, a value of -1 is returned and
errno is set to indicate the error.
If the setclock() function fails,
may be set to one of the following values:
The clktyp parameter does not specify a known system-wide clock,
the information pointed to by the val parameter is outside the
permissible range for the clock specified by the clktyp
parameter, or a nanosecond value less than zero or greater than or
equal to 1000 million is specified by the information pointed to by
the val parameter.
An error occurred while accessing the clock specified by the clktyp
The requesting process does not have the appropriate privilege to set
the clock specified by the clktyp parameter.
- RETURN VALUES
- RELATED INFORMATION
This document was created by
using the manual pages.
Time: 02:41:50 GMT, October 02, 2010