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Release 4.11 kernel/time/posix-stubs.c

Directory: kernel/time
/*
 * Dummy stubs used when CONFIG_POSIX_TIMERS=n
 *
 * Created by:  Nicolas Pitre, July 2016
 * Copyright:   (C) 2016 Linaro Limited
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/linkage.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/syscalls.h>
#include <linux/ktime.h>
#include <linux/timekeeping.h>
#include <linux/posix-timers.h>


asmlinkage long sys_ni_posix_timers(void) { pr_err_once("process %d (%s) attempted a POSIX timer syscall " "while CONFIG_POSIX_TIMERS is not set\n", current->pid, current->comm); return -ENOSYS; }

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#define SYS_NI(name) SYSCALL_ALIAS(sys_##name, sys_ni_posix_timers) SYS_NI(timer_create); SYS_NI(timer_gettime); SYS_NI(timer_getoverrun); SYS_NI(timer_settime); SYS_NI(timer_delete); SYS_NI(clock_adjtime); SYS_NI(getitimer); SYS_NI(setitimer); #ifdef __ARCH_WANT_SYS_ALARM SYS_NI(alarm); #endif /* * We preserve minimal support for CLOCK_REALTIME and CLOCK_MONOTONIC * as it is easy to remain compatible with little code. CLOCK_BOOTTIME * is also included for convenience as at least systemd uses it. */ SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, const struct timespec __user *, tp) { struct timespec new_tp; if (which_clock != CLOCK_REALTIME) return -EINVAL; if (copy_from_user(&new_tp, tp, sizeof (*tp))) return -EFAULT; return do_sys_settimeofday(&new_tp, NULL); } SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, struct timespec __user *,tp) { struct timespec kernel_tp; switch (which_clock) { case CLOCK_REALTIME: ktime_get_real_ts(&kernel_tp); break; case CLOCK_MONOTONIC: ktime_get_ts(&kernel_tp); break; case CLOCK_BOOTTIME: get_monotonic_boottime(&kernel_tp); break; default: return -EINVAL; } if (copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) return -EFAULT; return 0; } SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp) { struct timespec rtn_tp = { .tv_sec = 0, .tv_nsec = hrtimer_resolution, }; switch (which_clock) { case CLOCK_REALTIME: case CLOCK_MONOTONIC: case CLOCK_BOOTTIME: if (copy_to_user(tp, &rtn_tp, sizeof(rtn_tp))) return -EFAULT; return 0; default: return -EINVAL; } } SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, const struct timespec __user *, rqtp, struct timespec __user *, rmtp) { struct timespec t; switch (which_clock) { case CLOCK_REALTIME: case CLOCK_MONOTONIC: case CLOCK_BOOTTIME: if (copy_from_user(&t, rqtp, sizeof (struct timespec))) return -EFAULT; if (!timespec_valid(&t)) return -EINVAL; return hrtimer_nanosleep(&t, rmtp, flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL, which_clock); default: return -EINVAL; } } #ifdef CONFIG_COMPAT
long clock_nanosleep_restart(struct restart_block *restart_block) { return hrtimer_nanosleep_restart(restart_block); }

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#endif

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Directory: kernel/time
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