y2038: Add support for 64-bit time on legacy ABIs

A new build flag, _TIME_BITS, enables the usage of the newer 64-bit
time symbols for legacy ABI (where 32-bit time_t is default).  The 64
bit time support is only enabled if LFS (_FILE_OFFSET_BITS=64) is
also used.

Different than LFS support, the y2038 symbols are added only for the
required ABIs (armhf, csky, hppa, i386, m68k, microblaze, mips32,
mips64-n32, nios2, powerpc32, sparc32, s390-32, and sh).  The ABIs with
64-bit time support are unchanged, both for symbol and types
redirection.

On Linux the full 64-bit time support requires a minimum of kernel
version v5.1.  Otherwise, the 32-bit fallbacks are used and might
results in error with overflow return code (EOVERFLOW).

The i686-gnu does not yet support 64-bit time.

This patch exports following rediretions to support 64-bit time:

  * libc:
    adjtime
    adjtimex
    clock_adjtime
    clock_getres
    clock_gettime
    clock_nanosleep
    clock_settime
    cnd_timedwait
    ctime
    ctime_r
    difftime
    fstat
    fstatat
    futimens
    futimes
    futimesat
    getitimer
    getrusage
    gettimeofday
    gmtime
    gmtime_r
    localtime
    localtime_r
    lstat_time
    lutimes
    mktime
    msgctl
    mtx_timedlock
    nanosleep
    nanosleep
    ntp_gettime
    ntp_gettimex
    ppoll
    pselec
    pselect
    pthread_clockjoin_np
    pthread_cond_clockwait
    pthread_cond_timedwait
    pthread_mutex_clocklock
    pthread_mutex_timedlock
    pthread_rwlock_clockrdlock
    pthread_rwlock_clockwrlock
    pthread_rwlock_timedrdlock
    pthread_rwlock_timedwrlock
    pthread_timedjoin_np
    recvmmsg
    sched_rr_get_interval
    select
    sem_clockwait
    semctl
    semtimedop
    sem_timedwait
    setitimer
    settimeofday
    shmctl
    sigtimedwait
    stat
    thrd_sleep
    time
    timegm
    timerfd_gettime
    timerfd_settime
    timespec_get
    utime
    utimensat
    utimes
    utimes
    wait3
    wait4

  * librt:
    aio_suspend
    mq_timedreceive
    mq_timedsend
    timer_gettime
    timer_settime

  * libanl:
    gai_suspend

Reviewed-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>

2 files changed, 58 insertions, 0 deletions

diff --git a/sysdeps/pthread/semaphore.h b/sysdeps/pthread/semaphore.h
index 7fb0e5c103..35780e7c4e 100644
--- a/sysdeps/pthread/semaphore.h
+++ b/sysdeps/pthread/semaphore.h
@@ -59,16 +59,41 @@ extern int sem_wait (sem_t *__sem) __nonnull ((1));
 
    This function is a cancellation point and therefore not marked with
    __THROW.  */
+# ifndef __USE_TIME_BITS64
 extern int sem_timedwait (sem_t *__restrict __sem,
 			  const struct timespec *__restrict __abstime)
   __nonnull ((1, 2));
+# else
+#  ifdef __REDIRECT
+extern int __REDIRECT (sem_timedwait,
+                       (sem_t *__restrict __sem,
+                        const struct timespec *__restrict __abstime),
+                        __sem_timedwait64)
+  __nonnull ((1, 2));
+#  else
+#   define sem_timedwait __sem_timedwait64
+#  endif
+# endif
 #endif
 
 #ifdef __USE_GNU
+# ifndef __USE_TIME_BITS64
 extern int sem_clockwait (sem_t *__restrict __sem,
 			  clockid_t clock,
 			  const struct timespec *__restrict __abstime)
   __nonnull ((1, 3));
+# else
+#  ifdef __REDIRECT
+extern int __REDIRECT (sem_clockwait,
+                       (sem_t *__restrict __sem,
+                        clockid_t clock,
+                        const struct timespec *__restrict __abstime),
+                        __sem_clockwait64)
+  __nonnull ((1, 3));
+#  else
+#   define sem_clockwait __sem_clockwait64
+#  endif
+# endif
 #endif
 
 /* Test whether SEM is posted.  */
diff --git a/sysdeps/pthread/threads.h b/sysdeps/pthread/threads.h
index 46929a025e..bf251c9db4 100644
--- a/sysdeps/pthread/threads.h
+++ b/sysdeps/pthread/threads.h
@@ -88,8 +88,18 @@ extern thrd_t thrd_current (void);
    __TIME_POINT.  The current thread may resume if receives a signal.  In
    that case, if __REMAINING is not NULL, the remaining time is stored in
    the object pointed by it.  */
+#ifndef __USE_TIME_BITS64
 extern int thrd_sleep (const struct timespec *__time_point,
 		       struct timespec *__remaining);
+#else
+# ifdef __REDIRECT
+extern int __REDIRECT (thrd_sleep, (const struct timespec *__time_point,
+                                    struct timespec *__remaining),
+                       __thrd_sleep64);
+# else
+#  define thrd_sleep __thrd_sleep64
+# endif
+#endif
 
 /* Terminate current thread execution, cleaning up any thread local
    storage and freeing resources.  Returns the value specified in __RES.  */
@@ -131,8 +141,19 @@ extern int mtx_lock (mtx_t *__mutex);
 /* Block the current thread until the mutex pointed by __MUTEX is unlocked
    or time pointed by __TIME_POINT is reached.  In case the mutex is unlock,
    the current thread will not be blocked.  */
+#ifndef __USE_TIME_BITS64
 extern int mtx_timedlock (mtx_t *__restrict __mutex,
 			  const struct timespec *__restrict __time_point);
+#else
+# ifdef __REDIRECT
+extern int __REDIRECT (mtx_timedlock, (mtx_t *__restrict __mutex,
+                                       const struct timespec *__restrict
+                                       __time_point),
+                       __mtx_timedlock64);
+# else
+#  define mtx_timedlock __mtx_timedlock64
+# endif
+#endif
 
 /* Try to lock the mutex pointed by __MUTEX without blocking.  If the mutex
    is free the current threads takes control of it, otherwise it returns
@@ -171,9 +192,21 @@ extern int cnd_wait (cnd_t *__cond, mtx_t *__mutex);
 /* Block current thread on the condition variable until condition variable
    pointed by __COND is signaled or time pointed by __TIME_POINT is
    reached.  */
+#ifndef __USE_TIME_BITS64
 extern int cnd_timedwait (cnd_t *__restrict __cond,
 			  mtx_t *__restrict __mutex,
 			  const struct timespec *__restrict __time_point);
+#else
+# ifdef __REDIRECT
+extern int __REDIRECT (cnd_timedwait, (cnd_t *__restrict __cond,
+                                       mtx_t *__restrict __mutex,
+                                       const struct timespec *__restrict
+                                       __time_point),
+                       __cnd_timedwait64);
+# else
+#  define cnd_timedwait __cnd_timedwait64
+# endif
+#endif
 
 /* Destroy condition variable pointed by __cond and free all of its
    resources.  */