[newlib-cygwin] winsup/cygwin/times.cc (times): follow Linux and allow for a NULL buf argument

[Ken Brown]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=d5f84126e56ee860b10a8a5826dc568e2c266f1b

commit d5f84126e56ee860b10a8a5826dc568e2c266f1b
Author: Achim Gratz <Stromeko@nexgo.de>
Date:   Sun Sep 15 18:28:21 2019 +0200

    winsup/cygwin/times.cc (times): follow Linux and allow for a NULL buf argument
    
    Adresses the problem reported here:
    
      https://cygwin.com/ml/cygwin/2019-09/msg00141.html

Diff:
---
 winsup/cygwin/times.cc | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/winsup/cygwin/times.cc b/winsup/cygwin/times.cc
index 8908d44..909cae1 100644
--- a/winsup/cygwin/times.cc
+++ b/winsup/cygwin/times.cc
@@ -72,12 +72,17 @@ times (struct tms *buf)
       /* ticks is in in 100ns, convert to clock ticks. */
       tc = (clock_t) (ticks.QuadPart * CLOCKS_PER_SEC / NS100PERSEC);
 
-      buf->tms_stime = __to_clock_t (&kut.KernelTime, 0);
-      buf->tms_utime = __to_clock_t (&kut.UserTime, 0);
-      timeval_to_filetime (&myself->rusage_children.ru_stime, &kut.KernelTime);
-      buf->tms_cstime = __to_clock_t (&kut.KernelTime, 1);
-      timeval_to_filetime (&myself->rusage_children.ru_utime, &kut.UserTime);
-      buf->tms_cutime = __to_clock_t (&kut.UserTime, 1);
+      /* Linux allows a NULL buf and just returns tc in that case, so
+	 mimic that */
+      if (buf)
+	{
+	  buf->tms_stime = __to_clock_t (&kut.KernelTime, 0);
+	  buf->tms_utime = __to_clock_t (&kut.UserTime, 0);
+	  timeval_to_filetime (&myself->rusage_children.ru_stime, &kut.KernelTime);
+	  buf->tms_cstime = __to_clock_t (&kut.KernelTime, 1);
+	  timeval_to_filetime (&myself->rusage_children.ru_utime, &kut.UserTime);
+	  buf->tms_cutime = __to_clock_t (&kut.UserTime, 1);
+	}
     }
   __except (EFAULT)
     {