newlib/libc/time/time.c

   1 /*
   2 FUNCTION
   3 <<time>>---get current calendar time (as single number)
   4
   5 INDEX
   6         time
   7
   8 SYNOPSIS
   9         #include <time.h>
  10         time_t time(time_t *<[t]>);
  11
  12 DESCRIPTION
  13 <<time>> looks up the best available representation of the current
  14 time and returns it, encoded as a <<time_t>>.  It stores the same
  15 value at <[t]> unless the argument is <<NULL>>.
  16
  17 RETURNS
  18 A <<-1>> result means the current time is not available; otherwise the
  19 result represents the current time.
  20
  21 PORTABILITY
  22 ANSI C requires <<time>>.
  23
  24 Supporting OS subroutine required: Some implementations require
  25 <<gettimeofday>>.
  26 */
  27
  28 /* Most times we have a system call in newlib/libc/sys/.. to do this job */
  29
  30 #include <_ansi.h>
  31 #include <reent.h>
  32 #include <sys/types.h>
  33 #include <sys/time.h>
  34
  35 time_t
  36 time (time_t * t)
  37 {
  38   struct timeval now;
  39
  40   now.tv_sec = (time_t) -1;
  41
  42   if (_gettimeofday_r (_REENT, &now, NULL) < 0)
  43     now.tv_sec = (time_t) -1;
  44
  45   if (t)
  46     *t = now.tv_sec;
  47   return now.tv_sec;
  48 }