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linux: Use long time_t __getitimer/__setitimer

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The Linux kernel expects itimerval to use a 32-bit time_t, even on archs
with a 64-bit time_t (like RV32). To address this let's convert
itimerval to/from 32-bit and 64-bit to ensure the kernel always gets
a 32-bit time_t.

While we are converting these functions let's also convert them to be
the y2038 safe versions. This means there is a *64 function that is
called by a backwards compatible wrapper.

Tested-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Alistair Francis
2019-12-23 11:45:01 -08:00
parent 1c634e677f
commit a51e035889
5 changed files with 197 additions and 2 deletions
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61
sysdeps/unix/sysv/linux/getitimer.c Normal file
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/* getitimer -- Get the state of an interval timer. Linux/32 version.
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, 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
<http://www.gnu.org/licenses/>. */
#include <time.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sysdep.h>
#include <tv32-compat.h>
int
__getitimer64 (__itimer_which_t which, struct __itimerval64 *curr_value)
{
#if __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64
return INLINE_SYSCALL_CALL (getitimer, which, curr_value);
#else
struct __itimerval32 curr_value_32;
if (INLINE_SYSCALL_CALL (getitimer, which, &curr_value_32) == -1)
return -1;
curr_value->it_interval
= valid_timeval32_to_timeval64 (curr_value_32.it_interval);
curr_value->it_value
= valid_timeval32_to_timeval64 (curr_value_32.it_value);
return 0;
#endif
}
#if __TIMESIZE != 64
libc_hidden_def (__getitimer64)
int
__getitimer (__itimer_which_t which, struct itimerval *curr_value)
{
struct __itimerval64 val64;
if (__getitimer64 (which, &val64) != 0)
return -1;
curr_value->it_interval
= valid_timeval64_to_timeval (val64.it_interval);
curr_value->it_value
= valid_timeval64_to_timeval (val64.it_value);
return 0;
}
#endif
weak_alias (__getitimer, getitimer)