gettimeofday, settimeofday --
date and time functions
int gettimeofday(struct timeval tp, void *reserved);
int settimeofday(struct timeval tp, void *reserved);
gettimeofday gets and settimeofday sets
the system's notion of the current time.
The current time is expressed in elapsed seconds and microseconds
since 00:00 Universal Coordinated Time, January 1, 1970.
The resolution of the system clock is hardware dependent;
the time may be updated continuously or in clock ticks.
points to a timeval structure, which includes the following members:
long tv_sec; / seconds since Jan. 1, 1970 /
long tv_usec; / and microseconds /
is a null pointer, the current time information is not returned or set.
The second argument to these functions, reserved, should be NULL.
The TZ environment variable holds time zone information.
The calling process must have the P_SYSOPS privilege to
set the time of day.
A -1 return value indicates that an error occurred
and errno has been set.
The following error codes may be set in errno:
tp specifies an invalid time.
An attempt was made to set the time of day and the caller did
not have the P_SYSOPS privilege.
The implementation of settimeofday
ignores the tv_usec field of tp.
If the time needs to be set with better than one second accuracy, call
settimeofday for the seconds and then adjtime for finer accuracy.
© 2004 The SCO Group, Inc. All rights reserved.
UnixWare 7 Release 7.1.4 - 25 April 2004