implement CLOCK_VIRTUAL and CLOCK_PROF

[Todd C. Miller]

Since this came up in another thread.  Trivial implementations of
CLOCK_VIRTUAL and CLOCK_PROF, modeled after what FreeBSD does.

 - todd

Index: sys/sys/_time.h
===================================================================
RCS file: /home/cvs/openbsd/src/sys/sys/_time.h,v
retrieving revision 1.6
diff -u -r1.6 _time.h
--- sys/sys/_time.h     6 Oct 2013 01:27:49 -0000       1.6
+++ sys/sys/_time.h     15 Oct 2014 13:40:28 -0000
@@ -38,6 +38,7 @@
 #define CLOCK_MONOTONIC                        3
 #define CLOCK_THREAD_CPUTIME_ID                4
 #define CLOCK_UPTIME                   5
+#define CLOCK_PROF                     6
 
 #if __BSD_VISIBLE
 #define        __CLOCK_USE_TICKET_LOCKS        8       /* flag for 
__thrsleep() */
Index: sys/kern/kern_time.c
===================================================================
RCS file: /home/cvs/openbsd/src/sys/kern/kern_time.c,v
retrieving revision 1.88
diff -u -r1.88 kern_time.c
--- sys/kern/kern_time.c        15 May 2014 04:36:33 -0000      1.88
+++ sys/kern/kern_time.c        15 Oct 2014 14:31:06 -0000
@@ -108,12 +108,20 @@
 int
 clock_gettime(struct proc *p, clockid_t clock_id, struct timespec *tp)
 {
+       struct timespec sys;
        struct bintime bt;
        struct proc *q;
 
        switch (clock_id) {
        case CLOCK_REALTIME:
                nanotime(tp);
+               break;
+       case CLOCK_VIRTUAL:
+               calctsru(&p->p_p->ps_tu, tp, &sys, NULL);
+               break;
+       case CLOCK_PROF:
+               calctsru(&p->p_p->ps_tu, tp, &sys, NULL);
+               timespecadd(tp, &sys, tp);
                break;
        case CLOCK_UPTIME:
                binuptime(&bt);