[glibc] hurd: support clock_gettime(CLOCK_PROCESS/THREAD_CPUTIME_ID)

[Samuel Thibault <sthibaul@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=5a619c1f46c49dbb9706beeb74f4a466696394fc

commit 5a619c1f46c49dbb9706beeb74f4a466696394fc
Author: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date:   Sun Oct 11 13:59:01 2020 +0000

    hurd: support clock_gettime(CLOCK_PROCESS/THREAD_CPUTIME_ID)
    
    * sysdeps/mach/clock_gettime.c (__clock_gettime): Add support for
    CLOCK_PROCESS_CPUTIME_ID and CLOCK_THREAD_CPUTIME_ID.

Diff:
---
 sysdeps/mach/clock_gettime.c | 88 +++++++++++++++++++++++++++++++++++++-------
 1 file changed, 74 insertions(+), 14 deletions(-)

diff --git a/sysdeps/mach/clock_gettime.c b/sysdeps/mach/clock_gettime.c
index fbd80536d5..840e06036b 100644
--- a/sysdeps/mach/clock_gettime.c
+++ b/sysdeps/mach/clock_gettime.c
@@ -25,20 +25,80 @@
 int
 __clock_gettime (clockid_t clock_id, struct timespec *ts)
 {
-  if (clock_id != CLOCK_REALTIME)
-    {
-      errno = EINVAL;
-      return -1;
-    }
-
-  /* __host_get_time can only fail if passed an invalid host_t.
-     __mach_host_self could theoretically fail (producing an
-     invalid host_t) due to resource exhaustion, but we assume
-     this will never happen.  */
-  time_value_t tv;
-  __host_get_time (__mach_host_self (), &tv);
-  TIME_VALUE_TO_TIMESPEC (&tv, ts);
-  return 0;
+  mach_msg_type_number_t count;
+  error_t err;
+
+  switch (clock_id) {
+
+    case CLOCK_REALTIME:
+      {
+	/* __host_get_time can only fail if passed an invalid host_t.
+	   __mach_host_self could theoretically fail (producing an
+	   invalid host_t) due to resource exhaustion, but we assume
+	   this will never happen.  */
+	time_value_t tv;
+	__host_get_time (__mach_host_self (), &tv);
+	TIME_VALUE_TO_TIMESPEC (&tv, ts);
+	return 0;
+      }
+
+    case CLOCK_PROCESS_CPUTIME_ID:
+      {
+	struct time_value t = { .seconds = 0, .microseconds = 0 };
+	struct task_basic_info bi;
+	struct task_thread_times_info tti;
+
+	/* Dead threads CPU time.  */
+	count = TASK_BASIC_INFO_COUNT;
+	err = __task_info (__mach_task_self (), TASK_BASIC_INFO,
+			   (task_info_t) &bi, &count);
+	if (err)
+	  {
+	    __set_errno(err);
+	    return -1;
+	  }
+	time_value_add (&t, &bi.user_time);
+	time_value_add (&t, &bi.system_time);
+
+	/* Live threads CPU time.  */
+	count = TASK_EVENTS_INFO_COUNT;
+	err = __task_info (__mach_task_self (), TASK_THREAD_TIMES_INFO,
+			   (task_info_t) &tti, &count);
+	if (err)
+	  {
+	    __set_errno(err);
+	    return -1;
+	  }
+	time_value_add (&t, &tti.user_time);
+	time_value_add (&t, &tti.system_time);
+
+	TIME_VALUE_TO_TIMESPEC(&t, ts);
+	return 0;
+      }
+
+    case CLOCK_THREAD_CPUTIME_ID:
+      {
+	struct thread_basic_info bi;
+	mach_port_t self = __mach_thread_self ();
+
+	count = THREAD_BASIC_INFO_COUNT;
+	err = __thread_info (self, THREAD_BASIC_INFO,
+			     (thread_info_t) &bi, &count);
+	__mach_port_deallocate (__mach_task_self (), self);
+	if (err)
+	  {
+	    __set_errno(err);
+	    return -1;
+	  }
+	time_value_add (&bi.user_time, &bi.system_time);
+
+	TIME_VALUE_TO_TIMESPEC(&bi.user_time, ts);
+	return 0;
+      }
+  }
+
+  errno = EINVAL;
+  return -1;
 }
 libc_hidden_def (__clock_gettime)