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       time - get time in seconds


       #include <time.h>

       time_t time(time_t *tloc);


       time()  returns  the  time  as  the  number of seconds since the Epoch,
       1970-01-01 00:00:00 +0000 (UTC).

       If tloc is non-NULL, the return value is  also  stored  in  the  memory
       pointed to by tloc.


       On  success,  the value of time in seconds since the Epoch is returned.
       On error, ((time_t) -1) is returned, and errno is set appropriately.


       EFAULT tloc points outside  your  accessible  address  space  (but  see

              On  systems  where the C library time() wrapper function invokes
              an implementation provided by the vdso(7) (so that there  is  no
              trap  into the kernel), an invalid address may instead trigger a
              SIGSEGV signal.


       SVr4, 4.3BSD, C89, C99, POSIX.1-2001.  POSIX does not specify any error


       POSIX.1   defines   seconds  since  the  Epoch  using  a  formula  that
       approximates the number of seconds between a  specified  time  and  the
       Epoch.  This formula takes account of the facts that all years that are
       evenly divisible by 4  are  leap  years,  but  years  that  are  evenly
       divisible  by  100  are  not  leap  years  unless  they are also evenly
       divisible by 400, in which case they are leap years.  This value is not
       the  same  as  the  actual  number  of seconds between the time and the
       Epoch, because of leap  seconds  and  because  system  clocks  are  not
       required  to be synchronized to a standard reference.  The intention is
       that  the  interpretation  of  seconds  since  the  Epoch   values   be
       consistent; see POSIX.1-2008 Rationale A.4.15 for further rationale.

       On Linux, a call to time() with tloc specified as NULL cannot fail with
       the error EOVERFLOW, even on ABIs  where  time_t  is  a  signed  32-bit
       integer  and  the  clock ticks past the time 2**31 (2038-01-19 03:14:08
       UTC, ignoring leap seconds).  (POSIX.1 permits, but does  not  require,
       the  EOVERFLOW error in the case where the seconds since the Epoch will
       not fit in time_t.)  Instead, the behavior on Linux is  undefined  when
       the  system  time is out of the time_t range.  Applications intended to
       run after 2038 should use ABIs with time_t wider than 32 bits.


       Error  returns  from  this  system  call  are  indistinguishable   from
       successful  reports that the time is a few seconds before the Epoch, so
       the C library wrapper function never sets errno as  a  result  of  this

       The tloc argument is obsolescent and should always be NULL in new code.
       When tloc is NULL, the call cannot fail.


       date(1), gettimeofday(2), ctime(3), ftime(3), time(7), vdso(7)


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