![Thomas Gleixner](/assets/img/avatar_default.png)
The planned change to unify the behaviour of the MONOTONIC and BOOTTIME clocks vs. suspend removes the ability to retrieve the active non-suspended time of a system. Provide a new CLOCK_MONOTONIC_ACTIVE clock which returns the active non-suspended time of the system via clock_gettime(). This preserves the old behaviour of CLOCK_MONOTONIC before the BOOTTIME/MONOTONIC unification. This new clock also allows applications to detect programmatically that the MONOTONIC and BOOTTIME clocks are identical. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: John Stultz <john.stultz@linaro.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Kevin Easton <kevin@guarana.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mark Salyzyn <salyzyn@android.com> Cc: Michael Kerrisk <mtk.manpages@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Petr Mladek <pmladek@suse.com> Cc: Prarit Bhargava <prarit@redhat.com> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/20180301165149.965235774@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
230 lines
5.2 KiB
C
230 lines
5.2 KiB
C
/*
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* Dummy stubs used when CONFIG_POSIX_TIMERS=n
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*
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* Created by: Nicolas Pitre, July 2016
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* Copyright: (C) 2016 Linaro Limited
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/linkage.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/syscalls.h>
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#include <linux/ktime.h>
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#include <linux/timekeeping.h>
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#include <linux/posix-timers.h>
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#include <linux/compat.h>
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asmlinkage long sys_ni_posix_timers(void)
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{
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pr_err_once("process %d (%s) attempted a POSIX timer syscall "
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"while CONFIG_POSIX_TIMERS is not set\n",
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current->pid, current->comm);
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return -ENOSYS;
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}
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#define SYS_NI(name) SYSCALL_ALIAS(sys_##name, sys_ni_posix_timers)
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#define COMPAT_SYS_NI(name) SYSCALL_ALIAS(compat_sys_##name, sys_ni_posix_timers)
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SYS_NI(timer_create);
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SYS_NI(timer_gettime);
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SYS_NI(timer_getoverrun);
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SYS_NI(timer_settime);
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SYS_NI(timer_delete);
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SYS_NI(clock_adjtime);
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SYS_NI(getitimer);
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SYS_NI(setitimer);
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#ifdef __ARCH_WANT_SYS_ALARM
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SYS_NI(alarm);
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#endif
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/*
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* We preserve minimal support for CLOCK_REALTIME and CLOCK_MONOTONIC
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* as it is easy to remain compatible with little code. CLOCK_BOOTTIME
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* is also included for convenience as at least systemd uses it.
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*/
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SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
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const struct timespec __user *, tp)
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{
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struct timespec64 new_tp;
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if (which_clock != CLOCK_REALTIME)
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return -EINVAL;
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if (get_timespec64(&new_tp, tp))
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return -EFAULT;
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return do_sys_settimeofday64(&new_tp, NULL);
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}
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int do_clock_gettime(clockid_t which_clock, struct timespec64 *tp)
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{
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switch (which_clock) {
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case CLOCK_REALTIME:
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ktime_get_real_ts64(tp);
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break;
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case CLOCK_MONOTONIC:
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ktime_get_ts64(tp);
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break;
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case CLOCK_BOOTTIME:
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get_monotonic_boottime64(tp);
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break;
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case CLOCK_MONOTONIC_ACTIVE:
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ktime_get_active_ts64(tp);
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default:
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return -EINVAL;
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}
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return 0;
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}
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SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
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struct timespec __user *, tp)
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{
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int ret;
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struct timespec64 kernel_tp;
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ret = do_clock_gettime(which_clock, &kernel_tp);
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if (ret)
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return ret;
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if (put_timespec64(&kernel_tp, tp))
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return -EFAULT;
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return 0;
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}
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SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp)
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{
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struct timespec64 rtn_tp = {
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.tv_sec = 0,
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.tv_nsec = hrtimer_resolution,
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};
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switch (which_clock) {
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case CLOCK_REALTIME:
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case CLOCK_MONOTONIC:
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case CLOCK_BOOTTIME:
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if (put_timespec64(&rtn_tp, tp))
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return -EFAULT;
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return 0;
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default:
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return -EINVAL;
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}
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}
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SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags,
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const struct timespec __user *, rqtp,
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struct timespec __user *, rmtp)
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{
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struct timespec64 t;
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switch (which_clock) {
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case CLOCK_REALTIME:
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case CLOCK_MONOTONIC:
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case CLOCK_BOOTTIME:
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break;
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default:
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return -EINVAL;
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}
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if (get_timespec64(&t, rqtp))
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return -EFAULT;
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if (!timespec64_valid(&t))
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return -EINVAL;
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if (flags & TIMER_ABSTIME)
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rmtp = NULL;
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current->restart_block.nanosleep.type = rmtp ? TT_NATIVE : TT_NONE;
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current->restart_block.nanosleep.rmtp = rmtp;
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return hrtimer_nanosleep(&t, flags & TIMER_ABSTIME ?
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HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
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which_clock);
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}
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#ifdef CONFIG_COMPAT
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COMPAT_SYS_NI(timer_create);
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COMPAT_SYS_NI(clock_adjtime);
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COMPAT_SYS_NI(timer_settime);
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COMPAT_SYS_NI(timer_gettime);
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COMPAT_SYS_NI(getitimer);
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COMPAT_SYS_NI(setitimer);
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COMPAT_SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
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struct compat_timespec __user *, tp)
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{
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struct timespec64 new_tp;
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if (which_clock != CLOCK_REALTIME)
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return -EINVAL;
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if (compat_get_timespec64(&new_tp, tp))
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return -EFAULT;
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return do_sys_settimeofday64(&new_tp, NULL);
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}
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COMPAT_SYSCALL_DEFINE2(clock_gettime, clockid_t, which_clock,
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struct compat_timespec __user *, tp)
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{
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int ret;
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struct timespec64 kernel_tp;
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ret = do_clock_gettime(which_clock, &kernel_tp);
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if (ret)
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return ret;
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if (compat_put_timespec64(&kernel_tp, tp))
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return -EFAULT;
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return 0;
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}
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COMPAT_SYSCALL_DEFINE2(clock_getres, clockid_t, which_clock,
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struct compat_timespec __user *, tp)
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{
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struct timespec64 rtn_tp = {
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.tv_sec = 0,
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.tv_nsec = hrtimer_resolution,
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};
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switch (which_clock) {
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case CLOCK_REALTIME:
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case CLOCK_MONOTONIC:
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case CLOCK_BOOTTIME:
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if (compat_put_timespec64(&rtn_tp, tp))
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return -EFAULT;
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return 0;
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default:
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return -EINVAL;
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}
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}
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COMPAT_SYSCALL_DEFINE4(clock_nanosleep, clockid_t, which_clock, int, flags,
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struct compat_timespec __user *, rqtp,
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struct compat_timespec __user *, rmtp)
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{
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struct timespec64 t;
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switch (which_clock) {
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case CLOCK_REALTIME:
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case CLOCK_MONOTONIC:
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case CLOCK_BOOTTIME:
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break;
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default:
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return -EINVAL;
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}
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if (compat_get_timespec64(&t, rqtp))
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return -EFAULT;
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if (!timespec64_valid(&t))
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return -EINVAL;
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if (flags & TIMER_ABSTIME)
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rmtp = NULL;
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current->restart_block.nanosleep.type = rmtp ? TT_COMPAT : TT_NONE;
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current->restart_block.nanosleep.compat_rmtp = rmtp;
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return hrtimer_nanosleep(&t, flags & TIMER_ABSTIME ?
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HRTIMER_MODE_ABS : HRTIMER_MODE_REL,
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which_clock);
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}
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#endif
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