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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-02-17 13:35:19 -0300 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2021-06-15 10:42:11 -0300 |
commit | 47f24c21ee38701ae275aa9e451f70fa3e77478c (patch) | |
tree | b4cc52206173fb2ed427a1e797769d12369a89ad /sysdeps/unix/sysv/linux/features-time64.h | |
parent | 8af344feb5ae3e6e3374a6cf2175b44cc904a94e (diff) | |
download | glibc-47f24c21ee38701ae275aa9e451f70fa3e77478c.zip glibc-47f24c21ee38701ae275aa9e451f70fa3e77478c.tar.gz glibc-47f24c21ee38701ae275aa9e451f70fa3e77478c.tar.bz2 |
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>
Diffstat (limited to 'sysdeps/unix/sysv/linux/features-time64.h')
-rw-r--r-- | sysdeps/unix/sysv/linux/features-time64.h | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/features-time64.h b/sysdeps/unix/sysv/linux/features-time64.h new file mode 100644 index 0000000..1f786f9 --- /dev/null +++ b/sysdeps/unix/sysv/linux/features-time64.h @@ -0,0 +1,37 @@ +/* Features part to handle 64-bit time_t support. + Copyright (C) 2021 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +/* We need to know the word size in order to check the time size. */ +#include <bits/wordsize.h> +#include <bits/timesize.h> + +#if defined _TIME_BITS +# if _TIME_BITS == 64 +# if ! defined (_FILE_OFFSET_BITS) || _FILE_OFFSET_BITS != 64 +# error "_TIME_BITS=64 is allowed only with _FILE_OFFSET_BITS=64" +# elif __TIMESIZE == 32 +# define __USE_TIME_BITS64 1 +# endif +# elif _TIME_BITS == 32 +# if __TIMESIZE > 32 +# error "_TIME_BITS=32 is not compatible with __TIMESIZE > 32" +# endif +# else +# error Invalid _TIME_BITS value (can only be 32 or 64-bit) +# endif +#endif |