AuroraMiddleware/glibc
1
0
Fork 0
mirror of https://sourceware.org/git/glibc.git synced 2024-11-23 05:20:06 +00:00
Code Issues Packages Projects Releases Wiki Activity
0077624177
glibc/sysdeps/unix/sysv/linux/setitimer.c

91 lines
2.8 KiB
C
Raw Normal View History

linux: Use long time_t __getitimer/__setitimer 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>
2019-12-23 19:45:01 +00:00
/* setitimer -- Set the state of an interval timer. Linux/32 version.
Update copyright dates with scripts/update-copyrights
2023-01-06 21:08:04 +00:00
Copyright (C) 2020-2023 Free Software Foundation, Inc.
linux: Use long time_t __getitimer/__setitimer 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>
2019-12-23 19:45:01 +00:00
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;
Define in_int32_t_range to check if the 64 bit time_t syscall should be used Currently glibc uses in_time_t_range to detects time_t overflow, and if it occurs fallbacks to 64 bit syscall version. The function name is confusing because internally time_t might be either 32 bits or 64 bits (depending on __TIMESIZE). This patch refactors the in_time_t_range by replacing it with in_int32_t_range for the case to check if the 64 bit time_t syscall should be used. The in_time_t range is used to detect overflow of the syscall return value. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2022-11-08 04:49:46 +00:00
if (! in_int32_t_range (new_value->it_interval.tv_sec)
|| ! in_int32_t_range (new_value->it_value.tv_sec))
linux: Use long time_t __getitimer/__setitimer 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>
2019-12-23 19:45:01 +00:00
{
__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)
Reference in New Issue Copy Permalink