gettimeofday(3UCB) SunOS/BSD Compatibility Library Functionsgettimeofday(3UCB)NAME
gettimeofday, settimeofday - get or set the date and time
SYNOPSIS
/usr/ucb/cc [ flag ... ] file ...
#include <sys/time.h>
int gettimeofday(tp, tzp)
struct timeval *tzp;
struct timezone *tzp;
int settimeofday(tp, tzp)
struct timeval *tzp;
struct timezone *tzp;
DESCRIPTION
The system's notion of the current Greenwich time is obtained with the
gettimeofday() call, and set with the settimeofday() call. The current
time is expressed in elapsed seconds and microseconds since 00:00 GMT,
January 1, 1970 (zero hour). The resolution of the system clock is
hardware dependent; the time may be updated continuously, or in clock
ticks.
long tv_sec; /* seconds since Jan. 1, 1970 */
long tv_usec; /* and microseconds */
tp points to a timeval structure, which includes the following members:
If tp is a NULL pointer, the current time information is not returned
or set.
tzp is an obsolete pointer formerly used to get and set timezone infor‐
mation. tzp is now ignored. Timezone information is now handled using
the TZ environment variable; see TIMEZONE(4).
Only the privileged user may set the time of day.
RETURN VALUES
A −1 return value indicates an error occurred; in this case an error
code is stored in the global variable errno.
ERRORS
The following error codes may be set in errno:
EINVAL tp specifies an invalid time.
EPERM A user other than the privileged user attempted to set the
time.
SEE ALSOcc(1B), adjtime(2), ctime(3C), gettimeofday(3C), TIMEZONE(4)NOTES
Use of these interfaces should be restricted to only applications writ‐
ten on BSD platforms. Use of these interfaces with any of the system
libraries or in multi-thread applications is unsupported.
tzp is ignored in SunOS 5.X releases.
tv_usec is always 0.
SunOS 5.10 30 Oct 2007 gettimeofday(3UCB)
