/* clock.c - clock file for time.h *//* Copyright 1992-2001 Wind River Systems, Inc. *//*modification history--------------------01d,05oct01,dcb  Fix SPR 9814 and SPR 7736.  Change document to explain why                 VxWorks always returns -1 for this function.01c,05feb93,jdi  documentation cleanup for 5.1.01b,20sep92,smb  documentation additions01a,25jul92,smb  written.*//*  DESCRIPTION    INCLUDE FILE: time.h     SEE ALSO: American National Standard X3.159-1989 NOMANUAL*/#include "vxWorks.h"#include "time.h"/******************************************************************************** clock - determine the processor time in use (ANSI)** This routine returns the implementation's best approximation of* the processor time used by the program since the beginning of an* implementation-defined era related only to the program invocation.* To determine the time in seconds, the value returned by clock()* should be divided by the value of the macro CLOCKS_PER_SEC.  If the* processor time used is not available or its value cannot be* represented, clock() returns -1.** NOTE:* This routine always returns -1 in VxWorks.  VxWorks does not track* per-task time or system idle time.  There is no method of determining* how long a task or the entire system has been doing work.  tickGet()* can be used to query the number of system ticks since system start.* clock_gettime() can be used to get the current clock time.** INCLUDE FILES: time.h** RETURNS: -1** SEE ALSO: tickGet(), clock_gettime()*/clock_t clock (void)    {    return ((clock_t) -1);    }