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gettimeofday.0
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GETTIMEOFDAY(2) UNIX Programmer's Manual GETTIMEOFDAY(2)
NNAAMMEE
ggeettttiimmeeooffddaayy, sseettttiimmeeooffddaayy - get/set date and time
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssyyss//ttiimmee..hh>>
_i_n_t
ggeettttiimmeeooffddaayy(_s_t_r_u_c_t _t_i_m_e_v_a_l _*_t_p, _s_t_r_u_c_t _t_i_m_e_z_o_n_e _*_t_z_p)
_i_n_t
sseettttiimmeeooffddaayy(_s_t_r_u_c_t _t_i_m_e_v_a_l _*_t_p, _s_t_r_u_c_t _t_i_m_e_z_o_n_e _*_t_z_p)
DDEESSCCRRIIPPTTIIOONN
NNoottee:: ttiimmeezzoonnee iiss nnoo lloonnggeerr uusseedd;; tthhiiss iinnffoorrmmaattiioonn iiss kkeepptt oouuttssiiddee tthhee
kkeerrnneell.. The system's notion of the current Greenwich time and the cur
rent time zone is obtained with the ggeettttiimmeeooffddaayy() call, and set with the
sseettttiimmeeooffddaayy() 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 _t_p or _t_z_p is NULL, the associated time information will
not be returned or set.
The structures pointed to by _t_p and _t_z_p are defined in <_s_y_s_/_t_i_m_e_._h> 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 _t_i_m_e_z_o_n_e 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 superuser may set the time of day or time zone.
RREETTUURRNN
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 in
to the global variable _e_r_r_n_o.
EERRRROORRSS
The following error codes may be set in _e_r_r_n_o:
[EFAULT] An argument address referenced invalid memory.
[EPERM] A user other than the superuser attempted to set the time.
SSEEEE AALLSSOO
date(1), adjtime(2), ctime(3), timed(8)
HHIISSTTOORRYY
The ggeettttiimmeeooffddaayy function call appeared in 4.2BSD.
4th Berkeley Distribution March 10, 1991 1