xref: /reactos/sdk/lib/crt/time/clock.c (revision c2c66aff) 
1 /*
2  * COPYRIGHT:   LGPL, See LGPL.txt in the top level directory
3  * PROJECT:     ReactOS CRT library
4  * FILE:        lib/sdk/crt/time/clock.c
5  * PURPOSE:     Implementation of clock()
6  * PROGRAMER:   Timo Kreuzer
7  */
8 #include <precomp.h>
9 
10 ULARGE_INTEGER g_StartupTime;
11 
12 void
initclock(void)13 initclock(void)
14 {
15     GetSystemTimeAsFileTime((FILETIME*)&g_StartupTime);
16 }
17 
18 /******************************************************************************
19  * \name clock
20  * \brief Returns the current process's elapsed time.
21  */
22 clock_t
clock(void)23 clock(void)
24 {
25     ULARGE_INTEGER Time;
26 
27     GetSystemTimeAsFileTime((FILETIME*)&Time);
28     Time.QuadPart -= g_StartupTime.QuadPart;
29     return (clock_t)FileTimeToUnixTime((FILETIME*)&Time, NULL);
30 };
31