y2038: nptl: Convert sem_{clock|timed}wait to support 64 bit time

The sem_clockwait and sem_timedwait have been converted to support 64 bit time.

This change reuses futex_abstimed_wait_cancelable64 function introduced earlier.
The sem_{clock|timed}wait only accepts absolute time. Moreover, there is no
need to check for NULL passed as *abstime pointer to the syscalls as both calls
have exported symbols marked with __nonull attribute for abstime.

For systems with __TIMESIZE != 64 && __WORDSIZE == 32:
- Conversion from 32 bit time to 64 bit struct __timespec64 was necessary
- Redirection to __sem_{clock|timed}wait64 will provide support for 64 bit
  time

Build tests:
./src/scripts/build-many-glibcs.py glibcs

Run-time tests:
- Run specific tests on ARM/x86 32bit systems (qemu):
  https://github.com/lmajewski/meta-y2038 and run tests:
  https://github.com/lmajewski/y2038-tests/commits/master

Above tests were performed with Y2038 redirection applied as well as without
to test the proper usage of both __sem_{clock|timed}wait64 and
__sem_{clock|timed}wait.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

1 files changed, 17 insertions, 3 deletions

diff --git a/nptl/sem_clockwait.c b/nptl/sem_clockwait.c
index b9bae75183..1b93f00054 100644
--- a/nptl/sem_clockwait.c
+++ b/nptl/sem_clockwait.c
@@ -19,11 +19,12 @@
    <https://www.gnu.org/licenses/>.  */
 
 #include <time.h>
+#include "semaphoreP.h"
 #include "sem_waitcommon.c"
 
 int
-sem_clockwait (sem_t *sem, clockid_t clockid,
-	       const struct timespec *abstime)
+__sem_clockwait64 (sem_t *sem, clockid_t clockid,
+                   const struct __timespec64 *abstime)
 {
   /* Check that supplied clockid is one we support, even if we don't end up
      waiting.  */
@@ -42,5 +43,18 @@ sem_clockwait (sem_t *sem, clockid_t clockid,
   if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
     return 0;
   else
-    return __new_sem_wait_slow ((struct new_sem *) sem, clockid, abstime);
+    return __new_sem_wait_slow64 ((struct new_sem *) sem, clockid, abstime);
 }
+
+#if __TIMESIZE != 64
+libpthread_hidden_def (__sem_clockwait64)
+
+int
+__sem_clockwait (sem_t *sem, clockid_t clockid, const struct timespec *abstime)
+{
+  struct __timespec64 ts64 = valid_timespec_to_timespec64 (*abstime);
+
+  return __sem_clockwait64 (sem, clockid, &ts64);
+}
+#endif
+weak_alias (__sem_clockwait, sem_clockwait)