clock_gettime man page on DigitalUNIX

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clock_gettime(3)					      clock_gettime(3)

       clock_gettime,  clock_settime - Obtains or sets the time for the speci‐
       fied clock (P1003.1b)

       #include <time.h>

       int clock_gettime ( clockid_t clock_id, struct timespec *tp);

       int clock_settime ( clockid_t clock_id, const struct timespec *tp);

       Realtime Library (, librt.a)

       The clock type used to obtain the time for the clock that is  set.  The
       CLOCK_REALTIME  clock is supported and represents the TIME-OF-DAY clock
       for the system.	A pointer to a timespec data structure.

       The clock_gettime function returns the current  time  (in  seconds  and
       nanoseconds)  for  the specified clock. The clock_settime function sets
       the specified clock. The CLOCK_REALTIME clock measures  the  amount  of
       time  elapsed  since  00:00:00:00  January  1, 1970 Greenwich Mean Time
       (GMT), otherwise known as the Epoch. Time values	 that fall between two
       non-negative  integer multiples of the resolution are truncated down to
       the smaller multiple of the resolution.

       You must have superuser privileges to use the clock_settime function.

       On a successful call to the clock_gettime or clock_settime functions, a
       value of 0 (zero) is returned.

       On  an unsuccessful call, a value of -1 is returned and errno is set to
       indicate that an error occurred.

       The clock_gettime and clock_settime functions fail under the  following
       conditions:  The clock_id argument does not specify a known clock.  The
       value pointed to by the tp argument to the  clock_settime  function  is
       outside	the  range for the given clock_id. The tp argument specified a
       nanosecond value less than zero or greater than or equal to  1000  mil‐
       lion.   The  requesting process does not have the appropriate privilege
       to set the specified clock.

       Functions: time(1), clock_getres(3), ctime(3), timer_gettime(3)

       Guide to Realtime Programming


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