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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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90
sysdeps/unix/sysv/linux/setitimer.c Normal file
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/* setitimer -- Set 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
__setitimer64 (__itimer_which_t which,
const struct __itimerval64 *restrict new_value,
struct __itimerval64 *restrict old_value)
{
#if __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64
return INLINE_SYSCALL_CALL (setitimer, which, new_value, old_value);
#else
struct __itimerval32 new_value_32;
if (! in_time_t_range (new_value->it_interval.tv_sec)
|| ! in_time_t_range (new_value->it_value.tv_sec))
{
__set_errno (EOVERFLOW);
return -1;
}
new_value_32.it_interval
= valid_timeval64_to_timeval32 (new_value->it_interval);
new_value_32.it_value
= valid_timeval64_to_timeval32 (new_value->it_value);
if (old_value == NULL)
return INLINE_SYSCALL_CALL (setitimer, which, &new_value_32, NULL);
struct __itimerval32 old_value_32;
if (INLINE_SYSCALL_CALL (setitimer, which, &new_value_32, &old_value_32)
== -1)
return -1;
old_value->it_interval
= valid_timeval32_to_timeval64 (old_value_32.it_interval);
old_value->it_value
= valid_timeval32_to_timeval64 (old_value_32.it_value);
return 0;
#endif
}
#if __TIMESIZE != 64
libc_hidden_def (__setitimer64)
int
__setitimer (__itimer_which_t which,
const struct itimerval *restrict new_value,
struct itimerval *restrict old_value)
{
int ret;
struct __itimerval64 new64, old64;
new64.it_interval
= valid_timeval_to_timeval64 (new_value->it_interval);
new64.it_value
= valid_timeval_to_timeval64 (new_value->it_value);
ret = __setitimer64 (which, &new64, old_value ? &old64 : NULL);
if (ret == 0 && old_value != NULL)
{
old_value->it_interval
= valid_timeval64_to_timeval (old64.it_interval);
old_value->it_value
= valid_timeval64_to_timeval (old64.it_value);
}
return ret;
}
#endif
weak_alias (__setitimer, setitimer)