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Note:
timezone is no longer used; this information is kept outside the kernel.
The system’s notion of the current Greenwich time and the current time
zone is obtained with the call, and set with the call. The time is expressed
in seconds and microseconds since midnight (0 hour), January 1, 1970. The
resolution of the system clock is hardware dependent, and the time may
be updated continuously or in ‘‘ticks.’’ If or is NULL, the associated time
information will not be returned or set. The structures pointed to by
and are defined in as: struct timeval { long tv_sec; /* seconds since
Jan. 1, 1970 */
long tv_usec; /* and microseconds */
};
struct timezone { int tz_minuteswest; /* of Greenwich */
int tz_dsttime; /* type of dst correction to apply */
}; The structure indicates the local time zone (measured in minutes
of time westward from Greenwich), and a flag that, if nonzero, indicates
that Daylight Saving time applies locally during the appropriate part of
the year. Only the super-user may set the time of day or time zone.
A
0 return value indicates that the call succeeded. A -1 return value indicates
an error occurred, and in this case an error code is stored into the global
variable
The following error codes may be set in An argument
address referenced invalid memory. A user other than the super-user attempted
to set the time.
The function call appeared in
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