btrace(8): init and update timespec for BEGIN/END event

BEGIN and END use a fake dt(4) event, so in order to use the nsecs
var or time() it needs a timespec set. Init for BEGIN and update
at END.

ok mpi@

diff --git a/usr.sbin/btrace/btrace.c b/usr.sbin/btrace/btrace.c
index 15c67ab..961500a 100644 (file)
--- a/usr.sbin/btrace/btrace.c
+++ b/usr.sbin/btrace/btrace.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: btrace.c,v 1.36 2021/06/07 12:55:19 dv Exp $ */
+/*     $OpenBSD: btrace.c,v 1.37 2021/06/23 11:24:01 dv Exp $ */
 
 /*
  * Copyright (c) 2019 - 2020 Martin Pieuchot <mpi@openbsd.org>
@@ -442,6 +442,7 @@ rules_setup(int fd)
        memcpy(&bt_devt.dtev_comm, getprogname(), sizeof(bt_devt.dtev_comm));
        bt_devt.dtev_pid = getpid();
        bt_devt.dtev_tid = getthrid();
+       clock_gettime(CLOCK_REALTIME, &bt_devt.dtev_tsp);
 
        if (rbegin)
                rule_eval(rbegin, &bt_devt);
@@ -502,6 +503,9 @@ rules_teardown(int fd)
        if (dokstack)
                kelf_close();
 
+       /* Update "fake" event for BEGIN/END */
+       clock_gettime(CLOCK_REALTIME, &bt_devt.dtev_tsp);
+
        if (rend)
                rule_eval(rend, &bt_devt);
        else {