[glibc] support: Add xclock_now helper function.

[Adhemerval Zanella <azanella at sourceware dot org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=db13e32cb8d5f74fe61880459c7ddf8f47da436b

commit db13e32cb8d5f74fe61880459c7ddf8f47da436b
Author: Mike Crowe <mac@mcrowe.com>
Date:   Wed Jun 19 18:05:12 2019 -0300

    support: Add xclock_now helper function.
    
    It's easier to read and write tests with:
    
     const struct timespec ts = xclock_now(CLOCK_REALTIME);
    
    than
    
     struct timespec ts;
     xclock_gettime(CLOCK_REALTIME, &ts);
    
    	* support/xtime.h: Add xclock_now() helper function.

Diff:
---
 ChangeLog       |  4 ++++
 support/xtime.h | 10 ++++++++++
 2 files changed, 14 insertions(+)

diff --git a/ChangeLog b/ChangeLog
index 05291d7..de58169 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2019-06-20  Mike Crowe  <mac@mcrowe.com>
+
+	* support/xtime.h: Add xclock_now() helper function.
+
 2019-06-20  Dmitry V. Levin  <ldv@altlinux.org>
 	    Florian Weimer  <fweimer@redhat.com>
 
diff --git a/support/xtime.h b/support/xtime.h
index 68af1a5..6e19ce1 100644
--- a/support/xtime.h
+++ b/support/xtime.h
@@ -28,6 +28,16 @@ __BEGIN_DECLS
 
 void xclock_gettime (clockid_t clock, struct timespec *ts);
 
+/* This helper can often simplify tests by avoiding an explicit
+   variable declaration or allowing that declaration to be const. */
+
+static inline struct timespec xclock_now (clockid_t clock)
+{
+  struct timespec ts;
+  xclock_gettime (clock, &ts);
+  return ts;
+}
+
 __END_DECLS
 
 #endif /* SUPPORT_TIME_H */