newlib-cygwin/newlib/libc/time/time.c

/*
FUNCTION
<<time>>---get current calendar time (as single number)

INDEX
	time

SYNOPSIS
	#include <time.h>
	time_t time(time_t *<[t]>);

DESCRIPTION
<<time>> looks up the best available representation of the current
time and returns it, encoded as a <<time_t>>.  It stores the same
value at <[t]> unless the argument is <<NULL>>.

RETURNS
A <<-1>> result means the current time is not available; otherwise the
result represents the current time.

PORTABILITY
ANSI C requires <<time>>.

Supporting OS subroutine required: Some implementations require
<<gettimeofday>>.
*/

/* Most times we have a system call in newlib/libc/sys/.. to do this job */

#include <_ansi.h>
#include <reent.h>
#include <sys/types.h>
#include <sys/time.h>

time_t
time (time_t * t)
{
  struct timeval now;

  now.tv_sec = (time_t) -1;

  if (_gettimeofday_r (_REENT, &now, NULL) < 0)
    now.tv_sec = (time_t) -1;

  if (t)
    *t = now.tv_sec;
  return now.tv_sec;
}