4.4BSD/usr/share/man/cat2/settimeofday.0

GETTIMEOFDAY(2)             BSD 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 super-user 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 super-user 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        June 4, 1993                                1