Re: [PATCH 2/4] [y2038]cobalt: posix: clock: Adding clock_settime64

[chensong via Xenomai]

On 2021年03月11日 17:03, florian.bezd...@siemens.com wrote:
On Thu, 2021-03-11 at 10:46 +0800, chensong wrote:
Adding a new syscall clock_settime64 specific for timespec64,
It can solve y2038 in below scenarios:

1, 64bit kernel, y2038 safe
2, 32bit kernel, 32bit time_t, go to clock_settime, no break,
    y2038 not safe.
3, 32bit kernel, 64bit time_t, go to clock_settime64 by the help
    of libcobalt, no break, y2038 safe.

Signed-off-by: chensong <chens...@tj.kylinos.cn>
---
  include/cobalt/uapi/syscall.h |  1 +
  kernel/cobalt/posix/clock.c   | 12 ++++++++++++
  kernel/cobalt/posix/clock.h   |  4 ++++
  3 files changed, 17 insertions(+)

diff --git a/include/cobalt/uapi/syscall.h b/include/cobalt/uapi/syscall.h
index 8895d2b..291b550 100644
--- a/include/cobalt/uapi/syscall.h
+++ b/include/cobalt/uapi/syscall.h
@@ -123,6 +123,7 @@
  #define sc_cobalt_clock_adjtime                       100
  #define sc_cobalt_thread_setschedprio         101
  #define sc_cobalt_sem_timedwait64             102
+#define sc_cobalt_clock_settime64              103

I assume we should keep the order of affected syscalls. The next one
would be sc_cobalt_clock_gettime64.

yes, i thought about catagorizing them in order, probably adjust 
sc_cobalt_sem_timedwait64 later, next is sc_cobalt_clock_gettime64.



And I'm missing the tests... Please add tests for everything you add /
fix.

ongoing.

Song






  #define __NR_COBALT_SYSCALLS                  128 /* Power of 2 */




diff --git a/kernel/cobalt/posix/clock.c b/kernel/cobalt/posix/clock.c
index 6a47956..9643f8f 100644
--- a/kernel/cobalt/posix/clock.c
+++ b/kernel/cobalt/posix/clock.c
@@ -23,6 +23,7 @@
  #include "thread.h"
  #include "clock.h"
  #include <trace/events/cobalt-posix.h>
+#include <cobalt/kernel/time.h>




  static struct xnclock *external_clocks[COBALT_MAX_EXTCLOCKS];




@@ -193,6 +194,17 @@ COBALT_SYSCALL(clock_settime, current,
        return __cobalt_clock_settime(clock_id, &ts);
  }




+COBALT_SYSCALL(clock_settime64, current,
+              (clockid_t clock_id, const struct __kernel_timespec __user 
*u_ts))
+{
+       struct timespec64 ts64;
+
+       if (cobalt_get_timespec64(&ts64, u_ts))
+               return -EFAULT;
+
+       return __cobalt_clock_settime(clock_id, &ts64);
+}
+
  COBALT_SYSCALL(clock_adjtime, current,
               (clockid_t clock_id, struct __user_old_timex __user *u_tx))
  {
diff --git a/kernel/cobalt/posix/clock.h b/kernel/cobalt/posix/clock.h
index e69e76e..90f79fa 100644
--- a/kernel/cobalt/posix/clock.h
+++ b/kernel/cobalt/posix/clock.h
@@ -119,6 +119,10 @@ COBALT_SYSCALL_DECL(clock_gettime,
  COBALT_SYSCALL_DECL(clock_settime,
                    (clockid_t clock_id, const struct __user_old_timespec 
__user *u_ts));




+COBALT_SYSCALL_DECL(clock_settime64,
+                   (clockid_t clock_id,
+                        const struct __kernel_timespec __user *u_ts));
+
  COBALT_SYSCALL_DECL(clock_adjtime,
                    (clockid_t clock_id, struct __user_old_timex __user *u_tx));