/* * linux/kernel/posix-timers.c * * * 2002-10-15 Posix Clocks & timers * by George Anzinger george@mvista.com * * Copyright (C) 2002 2003 by MontaVista Software. * * 2004-06-01 Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug. * Copyright (C) 2004 Boris Hu * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or (at * your option) any later version. * * This program 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 * General Public License for more details. * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * * MontaVista Software | 1237 East Arques Avenue | Sunnyvale | CA 94085 | USA */ /* These are all the functions necessary to implement * POSIX clocks & timers */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Management arrays for POSIX timers. Timers are kept in slab memory * Timer ids are allocated by an external routine that keeps track of the * id and the timer. The external interface is: * * void *idr_find(struct idr *idp, int id); to find timer_id * int idr_get_new(struct idr *idp, void *ptr); to get a new id and * related it to * void idr_remove(struct idr *idp, int id); to release * void idr_init(struct idr *idp); to initialize * which we supply. * The idr_get_new *may* call slab for more memory so it must not be * called under a spin lock. Likewise idr_remore may release memory * (but it may be ok to do this under a lock...). * idr_find is just a memory look up and is quite fast. A -1 return * indicates that the requested id does not exist. */ /* * Lets keep our timers in a slab cache :-) */ static struct kmem_cache *posix_timers_cache; static struct idr posix_timers_id; static DEFINE_SPINLOCK(idr_lock); /* * we assume that the new SIGEV_THREAD_ID shares no bits with the other * SIGEV values. Here we put out an error if this assumption fails. */ #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" #endif /* * parisc wants ENOTSUP instead of EOPNOTSUPP */ #ifndef ENOTSUP # define ENANOSLEEP_NOTSUP EOPNOTSUPP #else # define ENANOSLEEP_NOTSUP ENOTSUP #endif /* * The timer ID is turned into a timer address by idr_find(). * Verifying a valid ID consists of: * * a) checking that idr_find() returns other than -1. * b) checking that the timer id matches the one in the timer itself. * c) that the timer owner is in the callers thread group. */ /* * CLOCKs: The POSIX standard calls for a couple of clocks and allows us * to implement others. This structure defines the various * clocks and allows the possibility of adding others. We * provide an interface to add clocks to the table and expect * the "arch" code to add at least one clock that is high * resolution. Here we define the standard CLOCK_REALTIME as a * 1/HZ resolution clock. * * RESOLUTION: Clock resolution is used to round up timer and interval * times, NOT to report clock times, which are reported with as * much resolution as the system can muster. In some cases this * resolution may depend on the underlying clock hardware and * may not be quantifiable until run time, and only then is the * necessary code is written. The standard says we should say * something about this issue in the documentation... * * FUNCTIONS: The CLOCKs structure defines possible functions to handle * various clock functions. For clocks that use the standard * system timer code these entries should be NULL. This will * allow dispatch without the overhead of indirect function * calls. CLOCKS that depend on other sources (e.g. WWV or GPS) * must supply functions here, even if the function just returns * ENOSYS. The standard POSIX timer management code assumes the * following: 1.) The k_itimer struct (sched.h) is used for the * timer. 2.) The list, it_lock, it_clock, it_id and it_pid * fields are not modified by timer code. * * At this time all functions EXCEPT clock_nanosleep can be * redirected by the CLOCKS structure. Clock_nanosleep is in * there, but the code ignores it. * * Permissions: It is assumed that the clock_settime() function defined * for each clock will take care of permission checks. Some * clocks may be set able by any user (i.e. local process * clocks) others not. Currently the only set able clock we * have is CLOCK_REALTIME and its high res counter part, both of * which we beg off on and pass to do_sys_settimeofday(). */ static struct k_clock posix_clocks[MAX_CLOCKS]; /* * These ones are defined below. */ static int common_nsleep(const clockid_t, int flags, struct timespec *t, struct timespec __user *rmtp); static void common_timer_get(struct k_itimer *, struct itimerspec *); static int common_timer_set(struct k_itimer *, int, struct itimerspec *, struct itimerspec *); static int common_timer_del(struct k_itimer *timer); static enum hrtimer_restart posix_timer_fn(struct hrtimer *data); static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags); #define lock_timer(tid, flags) \ ({ struct k_itimer *__timr; \ __cond_lock(&__timr->it_lock, __timr = __lock_timer(tid, flags)); \ __timr; \ }) static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) { spin_unlock_irqrestore(&timr->it_lock, flags); } /* * Call the k_clock hook function if non-null, or the default function. */ #define CLOCK_DISPATCH(clock, call, arglist) \ ((clock) < 0 ? posix_cpu_##call arglist : \ (posix_clocks[clock].call != NULL \ ? (*posix_clocks[clock].call) arglist : common_##call arglist)) /* * Default clock hook functions when the struct k_clock passed * to register_posix_clock leaves a function pointer null. * * The function common_CALL is the default implementation for * the function pointer CALL in struct k_clock. */ static inline int common_clock_getres(const clockid_t which_clock, struct timespec *tp) { tp->tv_sec = 0; tp->tv_nsec = posix_clocks[which_clock].res; return 0; } /* * Get real time for posix timers */ static int common_clock_get(clockid_t which_clock, struct timespec *tp) { ktime_get_real_ts(tp); return 0; } static inline int common_clock_set(const clockid_t which_clock, const struct timespec *tp) { return do_sys_settimeofday(tp, NULL); } static int common_timer_create(struct k_itimer *new_timer) { hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock, 0); return 0; } static int no_timer_create(struct k_itimer *new_timer) { return -EOPNOTSUPP; } static int no_nsleep(const clockid_t which_clock, int flags, struct timespec *tsave, struct timespec __user *rmtp) { return -EOPNOTSUPP; } /* * Return nonzero if we know a priori this clockid_t value is bogus. */ static inline int invalid_clockid(const clockid_t which_clock) { if (which_clock < 0) /* CPU clock, posix_cpu_* will check it */ return 0; if ((unsigned) which_clock >= MAX_CLOCKS) return 1; if (posix_clocks[which_clock].clock_getres != NULL) return 0; if (posix_clocks[which_clock].res != 0) return 0; return 1; } /* * Get monotonic time for posix timers */ static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp) { ktime_get_ts(tp); return 0; } /* * Get monotonic time for posix timers */ static int posix_get_monotonic_raw(clockid_t which_clock, struct timespec *tp) { getrawmonotonic(tp); return 0; } static int posix_get_realtime_coarse(clockid_t which_clock, struct timespec *tp) { *tp = current_kernel_time(); return 0; } static int posix_get_monotonic_coarse(clockid_t which_clock, struct timespec *tp) { *tp = get_monotonic_coarse(); return 0; } static int posix_get_coarse_res(const clockid_t which_clock, struct timespec *tp) { *tp = ktime_to_timespec(KTIME_LOW_RES); return 0; } /* * Initialize everything, well, just everything in Posix clocks/timers ;) */ static __init int init_posix_timers(void) { struct k_clock clock_realtime = { .clock_getres = hrtimer_get_res, }; struct k_clock clock_monotonic = { .clock_getres = hrtimer_get_res, .clock_get = posix_ktime_get_ts, .clock_set = do_posix_clock_nosettime, }; struct k_clock clock_monotonic_raw = { .clock_getres = hrtimer_get_res, .clock_get = posix_get_monotonic_raw, .clock_set = do_posix_clock_nosettime, .timer_create = no_timer_create, .nsleep = no_nsleep, }; struct k_clock clock_realtime_coarse = { .clock_getres = posix_get_coarse_res, .clock_get = posix_get_realtime_coarse, .clock_set = do_posix_clock_nosettime, .timer_create = no_timer_create, .nsleep = no_nsleep, }; struct k_clock clock_monotonic_coarse = { .clock_getres = posix_get_coarse_res, .clock_get = posix_get_monotonic_coarse, .clock_set = do_posix_clock_nosettime, .timer_create = no_timer_create, .nsleep = no_nsleep, }; register_posix_clock(CLOCK_REALTIME, &clock_realtime); register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic); register_posix_clock(CLOCK_MONOTONIC_RAW, &clock_monotonic_raw); register_posix_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse); register_posix_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse); posix_timers_cache = kmem_cache_create("posix_timers_cache", sizeof (struct k_itimer), 0, SLAB_PANIC, NULL); idr_init(&posix_timers_id); return 0; } __initcall(init_posix_timers); static void schedule_next_timer(struct k_itimer *timr) { struct hrtimer *timer = &timr->it.real.timer; if (timr->it.real.interval.tv64 == 0) return; timr->it_overrun += (unsigned int) hrtimer_forward(timer, timer->base->get_time(), timr->it.real.interval); timr->it_overrun_last = timr->it_overrun; timr->it_overrun = -1; ++timr->it_requeue_pending; hrtimer_restart(timer); } /* * This function is exported for use by the signal deliver code. It is * called just prior to the info block being released and passes that * block to us. It's function is to update the overrun entry AND to * restart the timer. It should only be called if the timer is to be * restarted (i.e. we have flagged this in the sys_private entry of the * info block). * * To protect aginst the timer going away while the interrupt is queued, * we require that the it_requeue_pending flag be set. */ void do_schedule_next_timer(struct siginfo *info) { struct k_itimer *timr; unsigned long flags; timr = lock_timer(info->si_tid, &flags); if (timr && timr->it_requeue_pending == info->si_sys_private) { if (timr->it_clock < 0) posix_cpu_timer_schedule(timr); else schedule_next_timer(timr); info->si_overrun += timr->it_overrun_last; } if (timr) unlock_timer(timr, flags); } int posix_timer_event(struct k_itimer *timr, int si_private) { struct task_struct *task; int shared, ret = -1; /* * FIXME: if ->sigq is queued we can race with * dequeue_signal()->do_schedule_next_timer(). * * If dequeue_signal() sees the "right" value of * si_sys_private it calls do_schedule_next_timer(). * We re-queue ->sigq and drop ->it_lock(). * do_schedule_next_timer() locks the timer * and re-schedules it while ->sigq is pending. * Not really bad, but not that we want. */ timr->sigq->info.si_sys_private = si_private; rcu_read_lock(); task = pid_task(timr->it_pid, PIDTYPE_PID); if (task) { shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID); ret = send_sigqueue(timr->sigq, task, shared); } rcu_read_unlock(); /* If we failed to send the signal the timer stops. */ return ret > 0; } EXPORT_SYMBOL_GPL(posix_timer_event); /* * This function gets called when a POSIX.1b interval timer expires. It * is used as a callback from the kernel internal timer. The * run_timer_list code ALWAYS calls with interrupts on. * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. */ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer) { struct k_itimer *timr; unsigned long flags; int si_private = 0; enum hrtimer_restart ret = HRTIMER_NORESTART; timr = container_of(timer, struct k_itimer, it.real.timer); spin_lock_irqsave(&timr->it_lock, flags); if (timr->it.real.interval.tv64 != 0) si_private = ++timr->it_requeue_pending; if (posix_timer_event(timr, si_private)) { /* * signal was not sent because of sig_ignor * we will not get a call back to restart it AND * it should be restarted. */ if (timr->it.real.interval.tv64 != 0) { ktime_t now = hrtimer_cb_get_time(timer); /* * FIXME: What we really want, is to stop this * timer completely and restart it in case the * SIG_IGN is removed. This is a non trivial * change which involves sighand locking * (sigh !), which we don't want to do late in * the release cycle. * * For now we just let timers with an interval * less than a jiffie expire every jiffie to * avoid softirq starvation in case of SIG_IGN * and a very small interval, which would put * the timer right back on the softirq pending * list. By moving now ahead of time we trick * hrtimer_forward() to expire the timer * later, while we still maintain the overrun * accuracy, but have some inconsistency in * the timer_gettime() case. This is at least * better than a starved softirq. A more * complex fix which solves also another related * inconsistency is already in the pipeline. */ #ifdef CONFIG_HIGH_RES_TIMERS { ktime_t kj = ktime_set(0, NSEC_PER_SEC / HZ); if (timr->it.real.interval.tv64 < kj.tv64) now = ktime_add(now, kj); } #endif timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, timr->it.real.interval); ret = HRTIMER_RESTART; ++timr->it_requeue_pending; } } unlock_timer(timr, flags); return ret; } static struct pid *good_sigevent(sigevent_t * event) { struct task_struct *rtn = current->group_leader; if ((event->sigev_notify & SIGEV_THREAD_ID ) && (!(rtn = find_task_by_vpid(event->sigev_notify_thread_id)) || !same_thread_group(rtn, current) || (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) return NULL; if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) return NULL; return task_pid(rtn); } void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock) { if ((unsigned) clock_id >= MAX_CLOCKS) { printk("POSIX clock register failed for clock_id %d\n", clock_id); return; } posix_clocks[clock_id] = *new_clock; } EXPORT_SYMBOL_GPL(register_posix_clock); static struct k_itimer * alloc_posix_timer(void) { struct k_itimer *tmr; tmr = kmem_cache_zalloc(posix_timers_cache, GFP_KERNEL); if (!tmr) return tmr; if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { kmem_cache_free(posix_timers_cache, tmr); return NULL; } memset(&tmr->sigq->info, 0, sizeof(siginfo_t)); return tmr; } #define IT_ID_SET 1 #define IT_ID_NOT_SET 0 static void release_posix_timer(struct k_itimer *tmr, int it_id_set) { if (it_id_set) { unsigned long flags; spin_lock_irqsave(&idr_lock, flags); idr_remove(&posix_timers_id, tmr->it_id); spin_unlock_irqrestore(&idr_lock, flags); } put_pid(tmr->it_pid); sigqueue_free(tmr->sigq); kmem_cache_free(posix_timers_cache, tmr); } static struct k_clock *clockid_to_kclock(const clockid_t id) { if (id < 0) return &clock_posix_cpu; if (id >= MAX_CLOCKS || !posix_clocks[id].clock_getres) return NULL; return &posix_clocks[id]; } /* Create a POSIX.1b interval timer. */ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock, struct sigevent __user *, timer_event_spec, timer_t __user *, created_timer_id) { struct k_itimer *new_timer; int error, new_timer_id; sigevent_t event; int it_id_set = IT_ID_NOT_SET; if (invalid_clockid(which_clock)) return -EINVAL; new_timer = alloc_posix_timer(); if (unlikely(!new_timer)) return -EAGAIN; spin_lock_init(&new_timer->it_lock); retry: if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) { error = -EAGAIN; goto out; } spin_lock_irq(&idr_lock); error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id); spin_unlock_irq(&idr_lock); if (error) { if (error == -EAGAIN) goto retry; /* * Weird looking, but we return EAGAIN if the IDR is * full (proper POSIX return value for this) */ error = -EAGAIN; goto out; } it_id_set = IT_ID_SET; new_timer->it_id = (timer_t) new_timer_id; new_timer->it_clock = which_clock; new_timer->it_overrun = -1; if (timer_event_spec) { if (copy_from_user(&event, timer_event_spec, sizeof (event))) { error = -EFAULT; goto out; } rcu_read_lock(); new_timer->it_pid = get_pid(good_sigevent(&event)); rcu_read_unlock(); if (!new_timer->it_pid) { error = -EINVAL; goto out; } } else { event.sigev_notify = SIGEV_SIGNAL; event.sigev_signo = SIGALRM; event.sigev_value.sival_int = new_timer->it_id; new_timer->it_pid = get_pid(task_tgid(current)); } new_timer->it_sigev_notify = event.sigev_notify; new_timer->sigq->info.si_signo = event.sigev_signo; new_timer->sigq->info.si_value = event.sigev_value; new_timer->sigq->info.si_tid = new_timer->it_id; new_timer->sigq->info.si_code = SI_TIMER; if (copy_to_user(created_timer_id, &new_timer_id, sizeof (new_timer_id))) { error = -EFAULT; goto out; } error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer)); if (error) goto out; spin_lock_irq(¤t->sighand->siglock); new_timer->it_signal = current->signal; list_add(&new_timer->list, ¤t->signal->posix_timers); spin_unlock_irq(¤t->sighand->siglock); return 0; /* * In the case of the timer belonging to another task, after * the task is unlocked, the timer is owned by the other task * and may cease to exist at any time. Don't use or modify * new_timer after the unlock call. */ out: release_posix_timer(new_timer, it_id_set); return error; } /* * Locking issues: We need to protect the result of the id look up until * we get the timer locked down so it is not deleted under us. The * removal is done under the idr spinlock so we use that here to bridge * the find to the timer lock. To avoid a dead lock, the timer id MUST * be release with out holding the timer lock. */ static struct k_itimer *__lock_timer(timer_t timer_id, unsigned long *flags) { struct k_itimer *timr; /* * Watch out here. We do a irqsave on the idr_lock and pass the * flags part over to the timer lock. Must not let interrupts in * while we are moving the lock. */ spin_lock_irqsave(&idr_lock, *flags); timr = idr_find(&posix_timers_id, (int)timer_id); if (timr) { spin_lock(&timr->it_lock); if (timr->it_signal == current->signal) { spin_unlock(&idr_lock); return timr; } spin_unlock(&timr->it_lock); } spin_unlock_irqrestore(&idr_lock, *flags); return NULL; } /* * Get the time remaining on a POSIX.1b interval timer. This function * is ALWAYS called with spin_lock_irq on the timer, thus it must not * mess with irq. * * We have a couple of messes to clean up here. First there is the case * of a timer that has a requeue pending. These timers should appear to * be in the timer list with an expiry as if we were to requeue them * now. * * The second issue is the SIGEV_NONE timer which may be active but is * not really ever put in the timer list (to save system resources). * This timer may be expired, and if so, we will do it here. Otherwise * it is the same as a requeue pending timer WRT to what we should * report. */ static void common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) { ktime_t now, remaining, iv; struct hrtimer *timer = &timr->it.real.timer; memset(cur_setting, 0, sizeof(struct itimerspec)); iv = timr->it.real.interval; /* interval timer ? */ if (iv.tv64) cur_setting->it_interval = ktime_to_timespec(iv); else if (!hrtimer_active(timer) && (timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) return; now = timer->base->get_time(); /* * When a requeue is pending or this is a SIGEV_NONE * timer move the expiry time forward by intervals, so * expiry is > now. */ if (iv.tv64 && (timr->it_requeue_pending & REQUEUE_PENDING || (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv); remaining = ktime_sub(hrtimer_get_expires(timer), now); /* Return 0 only, when the timer is expired and not pending */ if (remaining.tv64 <= 0) { /* * A single shot SIGEV_NONE timer must return 0, when * it is expired ! */ if ((timr->it_sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) cur_setting->it_value.tv_nsec = 1; } else cur_setting->it_value = ktime_to_timespec(remaining); } /* Get the time remaining on a POSIX.1b interval timer. */ SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id, struct itimerspec __user *, setting) { struct k_itimer *timr; struct itimerspec cur_setting; unsigned long flags; timr = lock_timer(timer_id, &flags); if (!timr) return -EINVAL; CLOCK_DISPATCH(timr->it_clock, timer_get, (timr, &cur_setting)); unlock_timer(timr, flags); if (copy_to_user(setting, &cur_setting, sizeof (cur_setting))) return -EFAULT; return 0; } /* * Get the number of overruns of a POSIX.1b interval timer. This is to * be the overrun of the timer last delivered. At the same time we are * accumulating overruns on the next timer. The overrun is frozen when * the signal is delivered, either at the notify time (if the info block * is not queued) or at the actual delivery time (as we are informed by * the call back to do_schedule_next_timer(). So all we need to do is * to pick up the frozen overrun. */ SYSCALL_DEFINE1(timer_getoverrun, timer_t, timer_id) { struct k_itimer *timr; int overrun; unsigned long flags; timr = lock_timer(timer_id, &flags); if (!timr) return -EINVAL; overrun = timr->it_overrun_last; unlock_timer(timr, flags); return overrun; } /* Set a POSIX.1b interval timer. */ /* timr->it_lock is taken. */ static int common_timer_set(struct k_itimer *timr, int flags, struct itimerspec *new_setting, struct itimerspec *old_setting) { struct hrtimer *timer = &timr->it.real.timer; enum hrtimer_mode mode; if (old_setting) common_timer_get(timr, old_setting); /* disable the timer */ timr->it.real.interval.tv64 = 0; /* * careful here. If smp we could be in the "fire" routine which will * be spinning as we hold the lock. But this is ONLY an SMP issue. */ if (hrtimer_try_to_cancel(timer) < 0) return TIMER_RETRY; timr->it_requeue_pending = (timr->it_requeue_pending + 2) & ~REQUEUE_PENDING; timr->it_overrun_last = 0; /* switch off the timer when it_value is zero */ if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) return 0; mode = flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL; hrtimer_init(&timr->it.real.timer, timr->it_clock, mode); timr->it.real.timer.function = posix_timer_fn; hrtimer_set_expires(timer, timespec_to_ktime(new_setting->it_value)); /* Convert interval */ timr->it.real.interval = timespec_to_ktime(new_setting->it_interval); /* SIGEV_NONE timers are not queued ! See common_timer_get */ if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) { /* Setup correct expiry time for relative timers */ if (mode == HRTIMER_MODE_REL) { hrtimer_add_expires(timer, timer->base->get_time()); } return 0; } hrtimer_start_expires(timer, mode); return 0; } /* Set a POSIX.1b interval timer */ SYSCALL_DEFINE4(timer_settime, timer_t, timer_id, int, flags, const struct itimerspec __user *, new_setting, struct itimerspec __user *, old_setting) { struct k_itimer *timr; struct itimerspec new_spec, old_spec; int error = 0; unsigned long flag; struct itimerspec *rtn = old_setting ? &old_spec : NULL; if (!new_setting) return -EINVAL; if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) return -EFAULT; if (!timespec_valid(&new_spec.it_interval) || !timespec_valid(&new_spec.it_value)) return -EINVAL; retry: timr = lock_timer(timer_id, &flag); if (!timr) return -EINVAL; error = CLOCK_DISPATCH(timr->it_clock, timer_set, (timr, flags, &new_spec, rtn)); unlock_timer(timr, flag); if (error == TIMER_RETRY) { rtn = NULL; // We already got the old time... goto retry; } if (old_setting && !error && copy_to_user(old_setting, &old_spec, sizeof (old_spec))) error = -EFAULT; return error; } static inline int common_timer_del(struct k_itimer *timer) { timer->it.real.interval.tv64 = 0; if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0) return TIMER_RETRY; return 0; } static inline int timer_delete_hook(struct k_itimer *timer) { return CLOCK_DISPATCH(timer->it_clock, timer_del, (timer)); } /* Delete a POSIX.1b interval timer. */ SYSCALL_DEFINE1(timer_delete, timer_t, timer_id) { struct k_itimer *timer; unsigned long flags; retry_delete: timer = lock_timer(timer_id, &flags); if (!timer) return -EINVAL; if (timer_delete_hook(timer) == TIMER_RETRY) { unlock_timer(timer, flags); goto retry_delete; } spin_lock(¤t->sighand->siglock); list_del(&timer->list); spin_unlock(¤t->sighand->siglock); /* * This keeps any tasks waiting on the spin lock from thinking * they got something (see the lock code above). */ timer->it_signal = NULL; unlock_timer(timer, flags); release_posix_timer(timer, IT_ID_SET); return 0; } /* * return timer owned by the process, used by exit_itimers */ static void itimer_delete(struct k_itimer *timer) { unsigned long flags; retry_delete: spin_lock_irqsave(&timer->it_lock, flags); if (timer_delete_hook(timer) == TIMER_RETRY) { unlock_timer(timer, flags); goto retry_delete; } list_del(&timer->list); /* * This keeps any tasks waiting on the spin lock from thinking * they got something (see the lock code above). */ timer->it_signal = NULL; unlock_timer(timer, flags); release_posix_timer(timer, IT_ID_SET); } /* * This is called by do_exit or de_thread, only when there are no more * references to the shared signal_struct. */ void exit_itimers(struct signal_struct *sig) { struct k_itimer *tmr; while (!list_empty(&sig->posix_timers)) { tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); itimer_delete(tmr); } } /* Not available / possible... functions */ int do_posix_clock_nosettime(const clockid_t clockid, const struct timespec *tp) { return -EINVAL; } EXPORT_SYMBOL_GPL(do_posix_clock_nosettime); int do_posix_clock_nonanosleep(const clockid_t clock, int flags, struct timespec *t, struct timespec __user *r) { return -ENANOSLEEP_NOTSUP; } EXPORT_SYMBOL_GPL(do_posix_clock_nonanosleep); SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock, const struct timespec __user *, tp) { struct timespec new_tp; if (invalid_clockid(which_clock)) return -EINVAL; if (copy_from_user(&new_tp, tp, sizeof (*tp))) return -EFAULT; return CLOCK_DISPATCH(which_clock, clock_set, (which_clock, &new_tp)); } SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock, struct timespec __user *,tp) { struct timespec kernel_tp; int error; if (invalid_clockid(which_clock)) return -EINVAL; error = CLOCK_DISPATCH(which_clock, clock_get, (which_clock, &kernel_tp)); if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) error = -EFAULT; return error; } SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock, struct timespec __user *, tp) { struct timespec rtn_tp; int error; if (invalid_clockid(which_clock)) return -EINVAL; error = CLOCK_DISPATCH(which_clock, clock_getres, (which_clock, &rtn_tp)); if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) { error = -EFAULT; } return error; } /* * nanosleep for monotonic and realtime clocks */ static int common_nsleep(const clockid_t which_clock, int flags, struct timespec *tsave, struct timespec __user *rmtp) { return hrtimer_nanosleep(tsave, rmtp, flags & TIMER_ABSTIME ? HRTIMER_MODE_ABS : HRTIMER_MODE_REL, which_clock); } SYSCALL_DEFINE4(clock_nanosleep, const clockid_t, which_clock, int, flags, const struct timespec __user *, rqtp, struct timespec __user *, rmtp) { struct timespec t; if (invalid_clockid(which_clock)) return -EINVAL; if (copy_from_user(&t, rqtp, sizeof (struct timespec))) return -EFAULT; if (!timespec_valid(&t)) return -EINVAL; return CLOCK_DISPATCH(which_clock, nsleep, (which_clock, flags, &t, rmtp)); } /* * nanosleep_restart for monotonic and realtime clocks */ static int common_nsleep_restart(struct restart_block *restart_block) { return hrtimer_nanosleep_restart(restart_block); } /* * This will restart clock_nanosleep. This is required only by * compat_clock_nanosleep_restart for now. */ long clock_nanosleep_restart(struct restart_block *restart_block) { clockid_t which_clock = restart_block->arg0; return CLOCK_DISPATCH(which_clock, nsleep_restart, (restart_block)); }