From: Lukasz Majewski <lukma@denx.de>
To: Joseph Myers <joseph@codesourcery.com>,
Paul Eggert <eggert@cs.ucla.edu>,
Adhemerval Zanella <adhemerval.zanella@linaro.org>,
Andreas Schwab <schwab@suse.de>
Cc: Alistair Francis <alistair23@gmail.com>,
Alistair Francis <alistair.francis@wdc.com>,
GNU C Library <libc-alpha@sourceware.org>,
Siddhesh Poyarekar <siddhesh@gotplt.org>,
Florian Weimer <fweimer@redhat.com>,
Florian Weimer <fw@deneb.enyo.de>,
Zack Weinberg <zackw@panix.com>,
Carlos O'Donell <carlos@redhat.com>
Subject: Re: [PATCH] y2038: linux: Provide __sched_rr_get_interval64 implementation
Date: Fri, 24 Jan 2020 17:38:17 +0100 [thread overview]
Message-ID: <20200124173817.2c11e5b2@jawa> (raw)
In-Reply-To: <20200108162248.24336-1-lukma@denx.de>
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Dear All,
> This patch replaces auto generated wrapper (as described in
> sysdeps/unix/sysv/linux/syscalls.list) for sched_rr_get_interval with
> one which adds extra support for reading 64 bit time values on
> machines with __TIMESIZE != 64.
> There is no functional change for architectures already supporting 64
> bit time ABI.
>
> The sched_rr_get_interval declaration in ./include/sched.h is not
> followed by corresponding libc_hidden_proto(), so it has been assumed
> that newly introduced syscall wrapper doesn't require
> libc_hidden_def() (which has been added by template used with auto
> generation script).
>
> Moreover, the code for building sched_rr_gi.c file is already placed
> in ./posix/Makefiles, so there was no need to add it elsewhere.
>
> Performed tests and validation are the same as for timer_gettime()
> conversion (sysdeps/unix/sysv/linux/timer_gettime.c).
> ---
> include/time.h | 7 +++
> sysdeps/unix/sysv/linux/sched_rr_gi.c | 73
> +++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/syscalls.list |
> 1 - 3 files changed, 80 insertions(+), 1 deletion(-)
> create mode 100644 sysdeps/unix/sysv/linux/sched_rr_gi.c
>
> diff --git a/include/time.h b/include/time.h
> index f23bfea737..558923274a 100644
> --- a/include/time.h
> +++ b/include/time.h
> @@ -203,6 +203,13 @@ libc_hidden_proto (__timer_settime64);
> libc_hidden_proto (__timerfd_settime64);
> #endif
>
> +#if __TIMESIZE == 64
> +# define __sched_rr_get_interval64 __sched_rr_get_interval
> +#else
> +extern int __sched_rr_get_interval64 (pid_t pid, struct __timespec64
> *tp); +libc_hidden_proto (__sched_rr_get_interval64);
> +#endif
> +
> /* Compute the `struct tm' representation of T,
> offset OFFSET seconds east of UTC,
> and store year, yday, mon, mday, wday, hour, min, sec into *TP.
> diff --git a/sysdeps/unix/sysv/linux/sched_rr_gi.c
> b/sysdeps/unix/sysv/linux/sched_rr_gi.c new file mode 100644
> index 0000000000..3d7b484591
> --- /dev/null
> +++ b/sysdeps/unix/sysv/linux/sched_rr_gi.c
> @@ -0,0 +1,73 @@
> +/* sched_rr_get_interval -- get the scheduler's SCHED_RR policy time
> interval.
> + 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; see the file COPYING.LIB.
> If
> + not, see <https://www.gnu.org/licenses/>. */
> +
> +#include <errno.h>
> +#include <stdlib.h>
> +#include <time.h>
> +#include <sysdep.h>
> +#include <kernel-features.h>
> +
> +int
> +__sched_rr_get_interval64 (pid_t pid, struct __timespec64 *tp)
> +{
> +#ifdef __ASSUME_TIME64_SYSCALLS
> +# ifndef __NR_sched_rr_get_interval_time64
> +# define __NR_sched_rr_get_interval_time64
> __NR_sched_rr_get_interval +# endif
> + return INLINE_SYSCALL_CALL (sched_rr_get_interval_time64, pid, tp);
> +#else
> +# ifdef __NR_sched_rr_get_interval_time64
> + int ret = INLINE_SYSCALL_CALL (sched_rr_get_interval_time64, pid,
> tp);
> + if (ret == 0 || errno != ENOSYS)
> + return ret;
> +# endif
> + struct timespec tp32;
> + int retval = INLINE_SYSCALL_CALL (sched_rr_get_interval, pid,
> &tp32);
> + if (retval == 0)
> + *tp = valid_timespec_to_timespec64 (tp32);
> +
> + return retval;
> +#endif
> +}
> +
> +#if __TIMESIZE != 64
> +libc_hidden_def (__sched_rr_get_interval64)
> +
> +int
> +__sched_rr_get_interval (pid_t pid, struct timespec *tp)
> +{
> + int ret;
> + struct __timespec64 tp64;
> +
> + ret = __sched_rr_get_interval64 (pid, &tp64);
> +
> + if (ret == 0)
> + {
> + if (! in_time_t_range (tp64.tv_sec))
> + {
> + __set_errno (EOVERFLOW);
> + return -1;
> + }
> +
> + *tp = valid_timespec64_to_timespec (tp64);
> + }
> +
> + return ret;
> +}
> +#endif
> +strong_alias (__sched_rr_get_interval, sched_rr_get_interval)
> diff --git a/sysdeps/unix/sysv/linux/syscalls.list
> b/sysdeps/unix/sysv/linux/syscalls.list index 1fa546f231..5d65ed23e0
> 100644 --- a/sysdeps/unix/sysv/linux/syscalls.list
> +++ b/sysdeps/unix/sysv/linux/syscalls.list
> @@ -51,7 +51,6 @@ sched_getp - sched_getparam
> i:ip __sched_getparam sched_getparam sched_gets
> - sched_getscheduler i:i
> __sched_getscheduler sched_getscheduler sched_primax
> - sched_get_priority_max i:i
> __sched_get_priority_max sched_get_priority_max
> sched_primin - sched_get_priority_min i:i
> __sched_get_priority_min sched_get_priority_min
> -sched_rr_gi - sched_rr_get_interval i:ip
> __sched_rr_get_interval sched_rr_get_interval
> sched_setp - sched_setparam i:ip
> __sched_setparam sched_setparam sched_sets -
> sched_setscheduler i:iip __sched_setscheduler
> sched_setscheduler sched_yield - sched_yield
> i: __sched_yield sched_yield
Gentle ping for review.
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:[~2020-01-24 16:38 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-08 16:22 [PATCH] y2038: linux: Provide __sched_rr_get_interval64 implementation Lukasz Majewski
2020-01-24 16:38 ` Lukasz Majewski [this message]
2020-01-30 22:05 ` Lukasz Majewski
2020-01-31 21:09 ` Adhemerval Zanella
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