gnu: glibc: Add clock patches for the Hurd.

* gnu/packages/patches/glibc-hurd-clock_t_centiseconds.patch: New file.
* gnu/packages/patches/glibc-hurd-clock_gettime_monotonic.patch: New file.
* gnu/local.mk (dist_patch_DATA): Update them.
* gnu/packages/base.scm (glibc): Use them.

gnu/local.mk

@@ -11,7 +11,7 @@
 # Copyright © 2016 Ben Woodcroft <donttrustben@gmail.com>
 # Copyright © 2016, 2017, 2018, 2019 Alex Vong <alexvong1995@gmail.com>
 # Copyright © 2016, 2017, 2018, 2019 Efraim Flashner <efraim@flashner.co.il>
-# Copyright © 2016, 2017, 2018, 2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+# Copyright © 2016, 2017, 2018, 2019, 2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 # Copyright © 2017, 2018, 2019, 2020 Tobias Geerinckx-Rice <me@tobias.gr>
 # Copyright © 2017, 2018 Clément Lassieur <clement@lassieur.org>
 # Copyright © 2017, 2020 Mathieu Othacehe <m.othacehe@gmail.com>
@@ -962,6 +962,8 @@ dist_patch_DATA =						\
   %D%/packages/patches/glibc-bootstrap-system-2.16.0.patch 	\
   %D%/packages/patches/glibc-bootstrap-system.patch		\
   %D%/packages/patches/glibc-hidden-visibility-ldconfig.patch	\
+  %D%/packages/patches/glibc-hurd-clock_gettime_monotonic.patch	\
+  %D%/packages/patches/glibc-hurd-clock_t_centiseconds.patch	\
   %D%/packages/patches/glibc-hurd-magic-pid.patch		\
   %D%/packages/patches/glibc-ldd-x86_64.patch			\
   %D%/packages/patches/glibc-locales.patch			\

gnu/packages/base.scm

@@ -612,7 +612,9 @@ (define-public glibc
                                      "glibc-versioned-locpath.patch"
                                      "glibc-allow-kernel-2.6.32.patch"
                                      "glibc-reinstate-prlimit64-fallback.patch"
-                                     "glibc-supported-locales.patch"))))
+                                     "glibc-supported-locales.patch"
+                                     "glibc-hurd-clock_t_centiseconds.patch"
+                                     "glibc-hurd-clock_gettime_monotonic.patch"))))
    (build-system gnu-build-system)
 
    ;; Glibc's <limits.h> refers to <linux/limit.h>, for instance, so glibc

gnu/packages/patches/glibc-hurd-clock_gettime_monotonic.patch

@@ -0,0 +1,84 @@
+This is needed to run Python on the Hurd, especially during the build of
+python-boot0.
+
+Adapted from https://salsa.debian.org/glibc-team/glibc/-/blob/glibc-2.31/debian/patches/hurd-i386/unsubmitted-clock_t_centiseconds.diff
+
+Use the realtime clock for the monotonic clock. This is of course not a proper
+implementation (which is being done in Mach), but will permit to fix at least
+the iceweasel stack.
+
+vlc however doesn't build when _POSIX_CLOCK_SELECTION is enabled but
+_POSIX_TIMERS is not, and they refuse to fix that (see #765578), so disable the
+former.
+
+From 0aa1dfd580cf9ad7b812c307b128decb782b825f Mon Sep 17 00:00:00 2001
+From: Jan Nieuwenhuizen <janneke@gnu.org>
+Date: Mon, 2 Mar 2020 18:59:04 +0100
+Subject: [PATCH 2/2] Use realtime clock for the monotonic clock.
+
+---
+ sysdeps/mach/clock_gettime.c       | 2 +-
+ sysdeps/mach/hurd/bits/posix_opt.h | 6 +++---
+ sysdeps/posix/clock_getres.c       | 1 +
+ sysdeps/pthread/timer_create.c     | 2 +-
+ 4 files changed, 6 insertions(+), 5 deletions(-)
+
+diff --git a/sysdeps/mach/clock_gettime.c b/sysdeps/mach/clock_gettime.c
+index ac3547df3c..af8681ba4e 100644
+--- a/sysdeps/mach/clock_gettime.c
++++ b/sysdeps/mach/clock_gettime.c
+@@ -25,7 +25,7 @@
+ int
+ __clock_gettime (clockid_t clock_id, struct timespec *ts)
+ {
+-  if (clock_id != CLOCK_REALTIME)
++  if (clock_id != CLOCK_MONOTONIC && clock_id != CLOCK_REALTIME)
+     {
+       errno = EINVAL;
+       return -1;
+diff --git a/sysdeps/mach/hurd/bits/posix_opt.h b/sysdeps/mach/hurd/bits/posix_opt.h
+index 0050151332..27b3a28ab7 100644
+--- a/sysdeps/mach/hurd/bits/posix_opt.h
++++ b/sysdeps/mach/hurd/bits/posix_opt.h
+@@ -163,10 +163,10 @@
+ #define _POSIX_THREAD_PROCESS_SHARED	-1
+ 
+ /* The monotonic clock might be available.  */
+-#define _POSIX_MONOTONIC_CLOCK	0
++#define _POSIX_MONOTONIC_CLOCK	200809L
+ 
+-/* The clock selection interfaces are available.  */
+-#define _POSIX_CLOCK_SELECTION	200809L
++/* The clock selection interfaces are not really available yet.  */
++#define _POSIX_CLOCK_SELECTION	-1
+ 
+ /* Advisory information interfaces could be available in future.  */
+ #define _POSIX_ADVISORY_INFO	0
+diff --git a/sysdeps/posix/clock_getres.c b/sysdeps/posix/clock_getres.c
+index fcd79fd554..1dd02aa449 100644
+--- a/sysdeps/posix/clock_getres.c
++++ b/sysdeps/posix/clock_getres.c
+@@ -52,6 +52,7 @@ __clock_getres (clockid_t clock_id, struct timespec *res)
+   switch (clock_id)
+     {
+     case CLOCK_REALTIME:
++    case CLOCK_MONOTONIC:
+       retval = realtime_getres (res);
+       break;
+ 
+diff --git a/sysdeps/pthread/timer_create.c b/sysdeps/pthread/timer_create.c
+index 9d8a9ea8ae..3430582c09 100644
+--- a/sysdeps/pthread/timer_create.c
++++ b/sysdeps/pthread/timer_create.c
+@@ -48,7 +48,7 @@ timer_create (clockid_t clock_id, struct sigevent *evp, timer_t *timerid)
+       return -1;
+     }
+ 
+-  if (clock_id != CLOCK_REALTIME)
++  if (clock_id != CLOCK_REALTIME && clock_id != CLOCK_MONOTONIC)
+     {
+       __set_errno (EINVAL);
+       return -1;
+-- 
+2.24.0
+

gnu/packages/patches/glibc-hurd-clock_t_centiseconds.patch

@@ -0,0 +1,90 @@
+This is needed to run Python on the Hurd, especially during the build of
+python-boot0.
+
+Adapted from https://salsa.debian.org/glibc-team/glibc/-/blob/glibc-2.31/debian/patches/hurd-i386/unsubmitted-clock_t_centiseconds.diff
+
+    commit d57f2f9b4bd007846af2fb4217486ea572579010
+    Author: Richard Braun <rbraun@sceen.net>
+    Date:   Tue Aug 27 11:35:31 2013 +0200
+
+        Express CPU time (clock_t of times(2)) in centiseconds
+
+From 170c292b643fdc1eb56881e6592b07c0c019993e Mon Sep 17 00:00:00 2001
+From: Jan Nieuwenhuizen <janneke@gnu.org>
+Date: Mon, 2 Mar 2020 18:28:54 +0100
+Subject: [PATCH 1/2] Express CPU time (clock_t) in centiseconds
+
+---
+ sysdeps/mach/hurd/clock.c     | 8 ++++----
+ sysdeps/mach/hurd/getclktck.c | 5 ++---
+ sysdeps/mach/hurd/setitimer.c | 2 +-
+ sysdeps/mach/hurd/times.c     | 2 +-
+ 4 files changed, 8 insertions(+), 9 deletions(-)
+
+diff --git a/sysdeps/mach/hurd/clock.c b/sysdeps/mach/hurd/clock.c
+index 7cb42df786..4db49b579d 100644
+--- a/sysdeps/mach/hurd/clock.c
++++ b/sysdeps/mach/hurd/clock.c
+@@ -44,10 +44,10 @@ clock (void)
+   if (err)
+     return __hurd_fail (err);
+ 
+-  total = bi.user_time.seconds * 1000000 + bi.user_time.microseconds;
+-  total += tti.user_time.seconds * 1000000 + tti.user_time.microseconds;
+-  total += bi.system_time.seconds * 1000000 + bi.system_time.microseconds;
+-  total += tti.system_time.seconds * 1000000 + tti.system_time.microseconds;
++  total = bi.user_time.seconds * 100 + bi.user_time.microseconds / 10000;
++  total += tti.user_time.seconds * 100 + tti.user_time.microseconds / 10000;
++  total += bi.system_time.seconds * 100 + bi.system_time.microseconds / 10000;
++  total += tti.system_time.seconds * 100 + tti.system_time.microseconds / 10000;
+ 
+   return total;
+ }
+diff --git a/sysdeps/mach/hurd/getclktck.c b/sysdeps/mach/hurd/getclktck.c
+index 943e36e805..5a3cf0930b 100644
+--- a/sysdeps/mach/hurd/getclktck.c
++++ b/sysdeps/mach/hurd/getclktck.c
+@@ -18,12 +18,11 @@
+ 
+ #include <time.h>
+ 
+-/* Return frequency of `times'.
+-   Since Mach reports CPU times in microseconds, we always use 1 million.  */
++/* Return frequency of `times'.  */
+ int
+ __getclktck (void)
+ {
+-  return 1000000;
++  return 100;
+ }
+ 
+ /* Before glibc 2.2, the Hurd actually did this differently, so we
+diff --git a/sysdeps/mach/hurd/setitimer.c b/sysdeps/mach/hurd/setitimer.c
+index b16f4ddd5d..8bf1464830 100644
+--- a/sysdeps/mach/hurd/setitimer.c
++++ b/sysdeps/mach/hurd/setitimer.c
+@@ -43,7 +43,7 @@ quantize_timeval (struct timeval *tv)
+   static time_t quantum = -1;
+ 
+   if (quantum == -1)
+-    quantum = 1000000 / __getclktck ();
++    quantum = 100 / __getclktck ();
+ 
+   tv->tv_usec = ((tv->tv_usec + (quantum - 1)) / quantum) * quantum;
+   if (tv->tv_usec >= 1000000)
+diff --git a/sysdeps/mach/hurd/times.c b/sysdeps/mach/hurd/times.c
+index 23ed992783..cbf6039b19 100644
+--- a/sysdeps/mach/hurd/times.c
++++ b/sysdeps/mach/hurd/times.c
+@@ -29,7 +29,7 @@
+ static inline clock_t
+ clock_from_time_value (const time_value_t *t)
+ {
+-  return t->seconds * 1000000 + t->microseconds;
++  return t->seconds * 100 + t->microseconds / 10000;
+ }
+ 
+ /* Store the CPU time used by this process and all its
+-- 
+2.24.0
+