From f1c314d27552eb6ce5db23b98b293696925741d5 Mon Sep 17 00:00:00 2001 From: Lukasz Majewski Date: Wed, 15 Jan 2020 10:14:23 +0100 Subject: 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 --- include/time.h | 3 ++ sysdeps/unix/sysv/linux/timespec_get.c | 59 ++++++++++++++++++++++++++++++++++ 2 files changed, 62 insertions(+) create mode 100644 sysdeps/unix/sysv/linux/timespec_get.c diff --git a/include/time.h b/include/time.h index f712a0e167..97d17c171a 100644 --- a/include/time.h +++ b/include/time.h @@ -254,6 +254,7 @@ extern double __difftime (time_t time1, time_t time0); #if __TIMESIZE == 64 # define __clock_nanosleep_time64 __clock_nanosleep # define __clock_gettime64 __clock_gettime +# define __timespec_get64 __timespec_get #else extern int __clock_nanosleep_time64 (clockid_t clock_id, int flags, const struct __timespec64 *req, @@ -261,6 +262,8 @@ extern int __clock_nanosleep_time64 (clockid_t clock_id, libc_hidden_proto (__clock_nanosleep_time64) extern int __clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp); libc_hidden_proto (__clock_gettime64) +extern int __timespec_get64 (struct __timespec64 *ts, int base); +libc_hidden_proto (__timespec_get64) #endif /* Use in the clock_* functions. Size of the field representing the 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 + . */ + +#include +#include + +/* 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); -- cgit v1.2.3