From: Lukasz Majewski <lukma@denx.de>
To: Alistair Francis <alistair.francis@wdc.com>
Cc: libc-alpha@sourceware.org, alistair23@gmail.com
Subject: Re: [PATCH v3 5/8] linux: Use long time_t __getitimer/__setitimer
Date: Sat, 15 Feb 2020 17:26:45 +0100 [thread overview]
Message-ID: <20200215172645.4ea3375d@jawa> (raw)
In-Reply-To: <20200214163134.31601-6-alistair.francis@wdc.com>
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Hi Alistair,
> 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.
> ---
> include/time.h | 15 +++++
> sysdeps/unix/sysv/linux/getitimer.c | 61 +++++++++++++++++
> sysdeps/unix/sysv/linux/setitimer.c | 95
> +++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/tv32-compat.h |
> 35 ++++++++++ 4 files changed, 206 insertions(+)
> create mode 100644 sysdeps/unix/sysv/linux/getitimer.c
> create mode 100644 sysdeps/unix/sysv/linux/setitimer.c
> create mode 100644 sysdeps/unix/sysv/linux/tv32-compat.h
>
> diff --git a/include/time.h b/include/time.h
> index 34dffaf95f..cdaf461c3f 100644
> --- a/include/time.h
> +++ b/include/time.h
> @@ -6,6 +6,7 @@
> # include <bits/types/locale_t.h>
> # include <stdbool.h>
> # include <time/mktime-internal.h>
> +# include <sys/time.h>
> # include <endian.h>
> # include <time-clockid.h>
> # include <sys/time.h>
> @@ -119,6 +120,20 @@ struct __itimerval64
> };
> #endif
>
> +#if __TIMESIZE == 64
> +# define __getitimer64 __getitimer
> +# define __setitimer64 __setitimer
> +#else
> +extern int __getitimer64 (enum __itimer_which __which,
> + struct __itimerval64 *__value);
> +
> +libc_hidden_proto (__getitimer64)
> +extern int __setitimer64 (enum __itimer_which __which,
> + const struct __itimerval64 *__restrict
> __new,
> + struct __itimerval64 *__restrict __old);
> +libc_hidden_proto (__setitimer64)
> +#endif
> +
> #if __TIMESIZE == 64
> # define __ctime64 ctime
> #else
> diff --git a/sysdeps/unix/sysv/linux/getitimer.c
> b/sysdeps/unix/sysv/linux/getitimer.c new file mode 100644
> index 0000000000..62d58a7af5
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/getitimer.c
> @@ -0,0 +1,61 @@
> +/* getitimer -- Get the state of an interval timer. Linux/tv32
> 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) +{
> +
Minor - please remove this blank line.
> +#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;
> +
> + /* Write all fields of 'curr_value' regardless of overflow. */
> + 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
> +}
> +
> +
Minor - please remove one blank line.
> +#if __TIMESIZE != 64
> +libc_hidden_def (__getitimer64)
> +int
> +__getitimer (__itimer_which_t which, struct itimerval *curr_value)
> +{
> + struct __itimerval64 val64;
> +
> + val64.it_interval
> + = valid_timeval_to_timeval64 (curr_value->it_interval);
> + val64.it_value
> + = valid_timeval_to_timeval64 (curr_value->it_value);
> +
> + return __getitimer64 (which, &val64);
> +}
> +#endif
> +weak_alias (__getitimer, getitimer)
> diff --git a/sysdeps/unix/sysv/linux/setitimer.c
> b/sysdeps/unix/sysv/linux/setitimer.c new file mode 100644
> index 0000000000..238853dd33
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/setitimer.c
> @@ -0,0 +1,95 @@
> +/* setitimer -- Set the state of an interval timer. Linux/tv32
> 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))
> + {
> + __set_errno (EOVERFLOW);
> + return -1;
> + }
> + new_value_32.it_interval
> + = valid_timeval64_to_timeval32 (new_value->it_interval);
> +
> + if (! in_time_t_range (new_value->it_value.tv_sec))
> + {
> + __set_errno (EOVERFLOW);
> + return -1;
> + }
> + 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;
> +
> + /* Write all fields of 'old_value' regardless of overflow. */
> + 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)
> + {
> + 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)
Tested-by: Lukasz Majewski <lukma@denx.de>
(ARM + qemu)
> diff --git a/sysdeps/unix/sysv/linux/tv32-compat.h
> b/sysdeps/unix/sysv/linux/tv32-compat.h new file mode 100644
> index 0000000000..4eb6f216ea
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/tv32-compat.h
> @@ -0,0 +1,35 @@
> +/* Compatibility definitions for `struct timeval' with 32-bit time_t.
> + 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/>. */
> +
> +#ifndef _TV32_COMPAT_H
> +#define _TV32_COMPAT_H 1
> +
> +#include <features.h>
> +
> +#include <bits/types.h>
I think that those two above headers are not necessary for this version
of struct __itimerval32 definition.
> +#include <bits/types/time_t.h>
> +#include <bits/types/struct_timeval.h>
As fair as I can see - the below code is not using struct timeval
anywhere, so this header is not necessary as well.
> +
> +/* Structures containing 'struct timeval' with 32-bit time_t. */
> +struct __itimerval32
> +{
> + struct __timeval32 it_interval;
> + struct __timeval32 it_value;
> +};
> +
> +#endif /* tv32-compat.h */
And just a side note - as we provide new getitimer/setitimer/getrusage
implementations to /sysdeps/unix/sysv/linux/ , those entries in
./sysdeps/unix/syscalls.list could be removed (as we override them
here).
Anyway, this could be changed in a follow up patch and shall be
regarded as a cleanup patch (no functional changes).
Best regards,
Lukasz Majewski
--
DENX Software Engineering GmbH, Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de
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next prev parent reply other threads:[~2020-02-15 16:27 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-14 16:31 [PATCH v3 0/8] Always use 32-bit time_t for certain syscalls Alistair Francis
2020-02-14 16:31 ` [PATCH v3 1/8] sysv/linux: Rename alpha functions to be alpha specific Alistair Francis
2020-02-15 13:54 ` Lukasz Majewski
2020-02-14 16:31 ` [PATCH v3 2/8] time: Add a timeval with a 32-bit tv_sec and tv_usec Alistair Francis
2020-02-15 13:57 ` Lukasz Majewski
2020-02-14 16:31 ` [PATCH v3 3/8] time: Add a __itimerval64 struct Alistair Francis
2020-02-14 16:31 ` [PATCH v3 4/8] sysv: Define __KERNEL_OLD_TIMEVAL_MATCHES_TIMEVAL64 Alistair Francis
2020-02-15 14:03 ` Lukasz Majewski
2020-02-14 16:31 ` [PATCH v3 5/8] linux: Use long time_t __getitimer/__setitimer Alistair Francis
2020-02-15 16:26 ` Lukasz Majewski [this message]
2020-02-18 18:54 ` Alistair Francis
2020-02-14 16:31 ` [PATCH v3 6/8] resource: Add a __rusage64 struct Alistair Francis
2020-02-14 16:31 ` [PATCH v3 7/8] linux: Use long time_t for wait4/getrusage Alistair Francis
2020-02-15 16:27 ` Lukasz Majewski
2020-02-16 16:30 ` Lukasz Majewski
2020-02-18 23:04 ` Alistair Francis
2020-02-14 16:31 ` [PATCH v3 8/8] sysv/alpha: Use generic __timeval32 and helpers Alistair Francis
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