settimeofday(2) settimeofday(2)
NAME [Toc] [Back]
settimeofday - set the date and time
SYNOPSIS [Toc] [Back]
#include <sys/time.h>
int settimeofday struct timeval *tp, const struct timezone *tzp);
DESCRIPTION [Toc] [Back]
The settimeofday() function sets the current time, expressed as
seconds and microseconds since Epoch, and passed as the timeval
structure pointed to by tp.
The resolution of the system clock is one microsecond.
Security Restrictions [Toc] [Back]
Only a user with appropriate privileges can set the time of day.
PARAMETERS [Toc] [Back]
tp A pointer to a timeval structure in which the current time is
returned.
The timeval structure includes the following members:
time_t tv_sec /* Seconds. */
long tv_usec /* Microseconds. */
tzp If this parameter is not a null pointer, it is interpreted as a
pointer to a timezone structure under HP-UX. The timezone
structure has the following fields:
tz_minuteswest The number of minutes that the local time zone is
west of Coordinated Universal Time (UTC) or Epoch.
tz_dsttime A flag that, if nonzero, indicates that Daylight
Savings Time (DST) applies locally during the
appropriate part of the year.
RETURN VALUE [Toc] [Back]
gettimeofday() returns the following values under HP-UX:
0 Successful completion.
-1 Failure. errno is set to indicate the error.
ERRORS [Toc] [Back]
If gettimeofday() fails, errno is set to the following value under
HP-UX:
[EFAULT] An argument address referenced invalid memory.
Hewlett-Packard Company - 1 - HP-UX 11i Version 2: August 2003
settimeofday(2) settimeofday(2)
[EINVAL] The tv_sec member of the tp parameter to
settimeofday() was less than zero or greater than
2^31.
[EPERM] A user lacking appropriate privileges attempted to
set the time.
WARNINGS [Toc] [Back]
Relying on a granularity of one microsecond may result in code that is
not portable to other platforms.
AUTHOR [Toc] [Back]
settimeofday() was developed by the University of California,
Berkeley, and HP.
SEE ALSO [Toc] [Back]
date(1), ftime(2), gettimeofday(2), stime(2), time(2), ctime(3C).
Hewlett-Packard Company - 2 - HP-UX 11i Version 2: August 2003 [ Back ] |
