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author | Lukasz Majewski <lukma@denx.de> | 2020-01-15 10:14:23 +0100 |
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committer | Lukasz Majewski <lukma@denx.de> | 2020-02-05 00:10:16 +0100 |
commit | f1c314d27552eb6ce5db23b98b293696925741d5 (patch) | |
tree | a27ab3a25e978690b8c154b8dd84eb2315ca7b06 /sysdeps/unix/sysv/linux/timespec_get.c | |
parent | 286a01d7ab53ee813907d4fde7c0f0a0d53e3c17 (diff) | |
download | glibc-f1c314d27552eb6ce5db23b98b293696925741d5.tar.gz |
y2038: linux: Provide __timespec_get64 implementation
This patch provides new instance of Linux specific timespec_get.c file placed
in ./sysdeps/unix/sysv/linux/.
When compared to this file version from ./time directory, it provides
__timespec_get64 explicit 64 bit function for getting 64 bit time in the
struct __timespec64 (for compilation using C11 standard).
Moreover, a 32 bit version - __timespec_get internally uses
__timespec_get64.
The __timespec_get is now supposed to be used on systems still supporting 32
bit time (__TIMESIZE != 64) - hence the necessary conversion to 32 bit struct
timespec.
Internally the timespec_get uses __clock_gettime64. This patch is necessary
for having architectures with __WORDSIZE == 32 Y2038 safe.
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 proper usage of both __timespec_get64 and __timespec_get.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps/unix/sysv/linux/timespec_get.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/timespec_get.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/timespec_get.c b/sysdeps/unix/sysv/linux/timespec_get.c new file mode 100644 index 0000000000..7e634f9dac --- /dev/null +++ b/sysdeps/unix/sysv/linux/timespec_get.c @@ -0,0 +1,59 @@ +/* timespec_get -- get system time - Linux version supporting 64 bit time. + Copyright (C) 2020 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. + + 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/>. */ + +#include <time.h> +#include <errno.h> + +/* Set TS to calendar time based in time base BASE. */ +int +__timespec_get64 (struct __timespec64 *ts, int base) +{ + if (base == TIME_UTC) + { + __clock_gettime64 (CLOCK_REALTIME, ts); + return base; + } + return 0; +} + +#if __TIMESIZE != 64 +libc_hidden_def (__timespec_get64) + +int +__timespec_get (struct timespec *ts, int base) +{ + int ret; + struct __timespec64 tp64; + + ret = __timespec_get64 (&tp64, base); + + if (ret == TIME_UTC) + { + if (! in_time_t_range (tp64.tv_sec)) + { + __set_errno (EOVERFLOW); + return 0; + } + + *ts = valid_timespec64_to_timespec (tp64); + } + + return ret; +} +#endif +strong_alias (__timespec_get, timespec_get); |