Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/kernel/posix_timers.c |
| 3 | * |
| 4 | * |
| 5 | * 2002-10-15 Posix Clocks & timers |
| 6 | * by George Anzinger george@mvista.com |
| 7 | * |
| 8 | * Copyright (C) 2002 2003 by MontaVista Software. |
| 9 | * |
| 10 | * 2004-06-01 Fix CLOCK_REALTIME clock/timer TIMER_ABSTIME bug. |
| 11 | * Copyright (C) 2004 Boris Hu |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or (at |
| 16 | * your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, but |
| 19 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 21 | * General Public License for more details. |
| 22 | |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 26 | * |
| 27 | * MontaVista Software | 1237 East Arques Avenue | Sunnyvale | CA 94085 | USA |
| 28 | */ |
| 29 | |
| 30 | /* These are all the functions necessary to implement |
| 31 | * POSIX clocks & timers |
| 32 | */ |
| 33 | #include <linux/mm.h> |
| 34 | #include <linux/smp_lock.h> |
| 35 | #include <linux/interrupt.h> |
| 36 | #include <linux/slab.h> |
| 37 | #include <linux/time.h> |
| 38 | |
| 39 | #include <asm/uaccess.h> |
| 40 | #include <asm/semaphore.h> |
| 41 | #include <linux/list.h> |
| 42 | #include <linux/init.h> |
| 43 | #include <linux/compiler.h> |
| 44 | #include <linux/idr.h> |
| 45 | #include <linux/posix-timers.h> |
| 46 | #include <linux/syscalls.h> |
| 47 | #include <linux/wait.h> |
| 48 | #include <linux/workqueue.h> |
| 49 | #include <linux/module.h> |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | /* |
| 52 | * Management arrays for POSIX timers. Timers are kept in slab memory |
| 53 | * Timer ids are allocated by an external routine that keeps track of the |
| 54 | * id and the timer. The external interface is: |
| 55 | * |
| 56 | * void *idr_find(struct idr *idp, int id); to find timer_id <id> |
| 57 | * int idr_get_new(struct idr *idp, void *ptr); to get a new id and |
| 58 | * related it to <ptr> |
| 59 | * void idr_remove(struct idr *idp, int id); to release <id> |
| 60 | * void idr_init(struct idr *idp); to initialize <idp> |
| 61 | * which we supply. |
| 62 | * The idr_get_new *may* call slab for more memory so it must not be |
| 63 | * called under a spin lock. Likewise idr_remore may release memory |
| 64 | * (but it may be ok to do this under a lock...). |
| 65 | * idr_find is just a memory look up and is quite fast. A -1 return |
| 66 | * indicates that the requested id does not exist. |
| 67 | */ |
| 68 | |
| 69 | /* |
| 70 | * Lets keep our timers in a slab cache :-) |
| 71 | */ |
| 72 | static kmem_cache_t *posix_timers_cache; |
| 73 | static struct idr posix_timers_id; |
| 74 | static DEFINE_SPINLOCK(idr_lock); |
| 75 | |
| 76 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | * we assume that the new SIGEV_THREAD_ID shares no bits with the other |
| 78 | * SIGEV values. Here we put out an error if this assumption fails. |
| 79 | */ |
| 80 | #if SIGEV_THREAD_ID != (SIGEV_THREAD_ID & \ |
| 81 | ~(SIGEV_SIGNAL | SIGEV_NONE | SIGEV_THREAD)) |
| 82 | #error "SIGEV_THREAD_ID must not share bit with other SIGEV values!" |
| 83 | #endif |
| 84 | |
| 85 | |
| 86 | /* |
| 87 | * The timer ID is turned into a timer address by idr_find(). |
| 88 | * Verifying a valid ID consists of: |
| 89 | * |
| 90 | * a) checking that idr_find() returns other than -1. |
| 91 | * b) checking that the timer id matches the one in the timer itself. |
| 92 | * c) that the timer owner is in the callers thread group. |
| 93 | */ |
| 94 | |
| 95 | /* |
| 96 | * CLOCKs: The POSIX standard calls for a couple of clocks and allows us |
| 97 | * to implement others. This structure defines the various |
| 98 | * clocks and allows the possibility of adding others. We |
| 99 | * provide an interface to add clocks to the table and expect |
| 100 | * the "arch" code to add at least one clock that is high |
| 101 | * resolution. Here we define the standard CLOCK_REALTIME as a |
| 102 | * 1/HZ resolution clock. |
| 103 | * |
| 104 | * RESOLUTION: Clock resolution is used to round up timer and interval |
| 105 | * times, NOT to report clock times, which are reported with as |
| 106 | * much resolution as the system can muster. In some cases this |
| 107 | * resolution may depend on the underlying clock hardware and |
| 108 | * may not be quantifiable until run time, and only then is the |
| 109 | * necessary code is written. The standard says we should say |
| 110 | * something about this issue in the documentation... |
| 111 | * |
| 112 | * FUNCTIONS: The CLOCKs structure defines possible functions to handle |
| 113 | * various clock functions. For clocks that use the standard |
| 114 | * system timer code these entries should be NULL. This will |
| 115 | * allow dispatch without the overhead of indirect function |
| 116 | * calls. CLOCKS that depend on other sources (e.g. WWV or GPS) |
| 117 | * must supply functions here, even if the function just returns |
| 118 | * ENOSYS. The standard POSIX timer management code assumes the |
| 119 | * following: 1.) The k_itimer struct (sched.h) is used for the |
| 120 | * timer. 2.) The list, it_lock, it_clock, it_id and it_process |
| 121 | * fields are not modified by timer code. |
| 122 | * |
| 123 | * At this time all functions EXCEPT clock_nanosleep can be |
| 124 | * redirected by the CLOCKS structure. Clock_nanosleep is in |
| 125 | * there, but the code ignores it. |
| 126 | * |
| 127 | * Permissions: It is assumed that the clock_settime() function defined |
| 128 | * for each clock will take care of permission checks. Some |
| 129 | * clocks may be set able by any user (i.e. local process |
| 130 | * clocks) others not. Currently the only set able clock we |
| 131 | * have is CLOCK_REALTIME and its high res counter part, both of |
| 132 | * which we beg off on and pass to do_sys_settimeofday(). |
| 133 | */ |
| 134 | |
| 135 | static struct k_clock posix_clocks[MAX_CLOCKS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 137 | /* |
| 138 | * These ones are defined below. |
| 139 | */ |
| 140 | static int common_nsleep(const clockid_t, int flags, struct timespec *t, |
| 141 | struct timespec __user *rmtp); |
| 142 | static void common_timer_get(struct k_itimer *, struct itimerspec *); |
| 143 | static int common_timer_set(struct k_itimer *, int, |
| 144 | struct itimerspec *, struct itimerspec *); |
| 145 | static int common_timer_del(struct k_itimer *timer); |
| 146 | |
| 147 | static int posix_timer_fn(void *data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
| 149 | static struct k_itimer *lock_timer(timer_t timer_id, unsigned long *flags); |
| 150 | |
| 151 | static inline void unlock_timer(struct k_itimer *timr, unsigned long flags) |
| 152 | { |
| 153 | spin_unlock_irqrestore(&timr->it_lock, flags); |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * Call the k_clock hook function if non-null, or the default function. |
| 158 | */ |
| 159 | #define CLOCK_DISPATCH(clock, call, arglist) \ |
| 160 | ((clock) < 0 ? posix_cpu_##call arglist : \ |
| 161 | (posix_clocks[clock].call != NULL \ |
| 162 | ? (*posix_clocks[clock].call) arglist : common_##call arglist)) |
| 163 | |
| 164 | /* |
| 165 | * Default clock hook functions when the struct k_clock passed |
| 166 | * to register_posix_clock leaves a function pointer null. |
| 167 | * |
| 168 | * The function common_CALL is the default implementation for |
| 169 | * the function pointer CALL in struct k_clock. |
| 170 | */ |
| 171 | |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 172 | static inline int common_clock_getres(const clockid_t which_clock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | struct timespec *tp) |
| 174 | { |
| 175 | tp->tv_sec = 0; |
| 176 | tp->tv_nsec = posix_clocks[which_clock].res; |
| 177 | return 0; |
| 178 | } |
| 179 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 180 | /* |
| 181 | * Get real time for posix timers |
| 182 | */ |
| 183 | static int common_clock_get(clockid_t which_clock, struct timespec *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 185 | ktime_get_real_ts(tp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | return 0; |
| 187 | } |
| 188 | |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 189 | static inline int common_clock_set(const clockid_t which_clock, |
| 190 | struct timespec *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | { |
| 192 | return do_sys_settimeofday(tp, NULL); |
| 193 | } |
| 194 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 195 | static int common_timer_create(struct k_itimer *new_timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 197 | hrtimer_init(&new_timer->it.real.timer, new_timer->it_clock); |
| 198 | new_timer->it.real.timer.data = new_timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | new_timer->it.real.timer.function = posix_timer_fn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | /* |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 204 | * Return nonzero if we know a priori this clockid_t value is bogus. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | */ |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 206 | static inline int invalid_clockid(const clockid_t which_clock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | { |
| 208 | if (which_clock < 0) /* CPU clock, posix_cpu_* will check it */ |
| 209 | return 0; |
| 210 | if ((unsigned) which_clock >= MAX_CLOCKS) |
| 211 | return 1; |
| 212 | if (posix_clocks[which_clock].clock_getres != NULL) |
| 213 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | if (posix_clocks[which_clock].res != 0) |
| 215 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | return 1; |
| 217 | } |
| 218 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 219 | /* |
| 220 | * Get monotonic time for posix timers |
| 221 | */ |
| 222 | static int posix_ktime_get_ts(clockid_t which_clock, struct timespec *tp) |
| 223 | { |
| 224 | ktime_get_ts(tp); |
| 225 | return 0; |
| 226 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
| 228 | /* |
| 229 | * Initialize everything, well, just everything in Posix clocks/timers ;) |
| 230 | */ |
| 231 | static __init int init_posix_timers(void) |
| 232 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 233 | struct k_clock clock_realtime = { |
| 234 | .clock_getres = hrtimer_get_res, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | }; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 236 | struct k_clock clock_monotonic = { |
| 237 | .clock_getres = hrtimer_get_res, |
| 238 | .clock_get = posix_ktime_get_ts, |
| 239 | .clock_set = do_posix_clock_nosettime, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | }; |
| 241 | |
| 242 | register_posix_clock(CLOCK_REALTIME, &clock_realtime); |
| 243 | register_posix_clock(CLOCK_MONOTONIC, &clock_monotonic); |
| 244 | |
| 245 | posix_timers_cache = kmem_cache_create("posix_timers_cache", |
| 246 | sizeof (struct k_itimer), 0, 0, NULL, NULL); |
| 247 | idr_init(&posix_timers_id); |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | __initcall(init_posix_timers); |
| 252 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | static void schedule_next_timer(struct k_itimer *timr) |
| 254 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 255 | if (timr->it.real.interval.tv64 == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | return; |
| 257 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 258 | timr->it_overrun += hrtimer_forward(&timr->it.real.timer, |
| 259 | timr->it.real.interval); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | timr->it_overrun_last = timr->it_overrun; |
| 261 | timr->it_overrun = -1; |
| 262 | ++timr->it_requeue_pending; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 263 | hrtimer_restart(&timr->it.real.timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | /* |
| 267 | * This function is exported for use by the signal deliver code. It is |
| 268 | * called just prior to the info block being released and passes that |
| 269 | * block to us. It's function is to update the overrun entry AND to |
| 270 | * restart the timer. It should only be called if the timer is to be |
| 271 | * restarted (i.e. we have flagged this in the sys_private entry of the |
| 272 | * info block). |
| 273 | * |
| 274 | * To protect aginst the timer going away while the interrupt is queued, |
| 275 | * we require that the it_requeue_pending flag be set. |
| 276 | */ |
| 277 | void do_schedule_next_timer(struct siginfo *info) |
| 278 | { |
| 279 | struct k_itimer *timr; |
| 280 | unsigned long flags; |
| 281 | |
| 282 | timr = lock_timer(info->si_tid, &flags); |
| 283 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 284 | if (timr && timr->it_requeue_pending == info->si_sys_private) { |
| 285 | if (timr->it_clock < 0) |
| 286 | posix_cpu_timer_schedule(timr); |
| 287 | else |
| 288 | schedule_next_timer(timr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 290 | info->si_overrun = timr->it_overrun_last; |
| 291 | } |
| 292 | |
| 293 | unlock_timer(timr, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | } |
| 295 | |
| 296 | int posix_timer_event(struct k_itimer *timr,int si_private) |
| 297 | { |
| 298 | memset(&timr->sigq->info, 0, sizeof(siginfo_t)); |
| 299 | timr->sigq->info.si_sys_private = si_private; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 300 | /* Send signal to the process that owns this timer.*/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | |
| 302 | timr->sigq->info.si_signo = timr->it_sigev_signo; |
| 303 | timr->sigq->info.si_errno = 0; |
| 304 | timr->sigq->info.si_code = SI_TIMER; |
| 305 | timr->sigq->info.si_tid = timr->it_id; |
| 306 | timr->sigq->info.si_value = timr->it_sigev_value; |
Oleg Nesterov | e752dd6 | 2005-09-06 15:17:42 -0700 | [diff] [blame] | 307 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | if (timr->it_sigev_notify & SIGEV_THREAD_ID) { |
Oleg Nesterov | e752dd6 | 2005-09-06 15:17:42 -0700 | [diff] [blame] | 309 | struct task_struct *leader; |
| 310 | int ret = send_sigqueue(timr->it_sigev_signo, timr->sigq, |
| 311 | timr->it_process); |
| 312 | |
| 313 | if (likely(ret >= 0)) |
| 314 | return ret; |
| 315 | |
| 316 | timr->it_sigev_notify = SIGEV_SIGNAL; |
| 317 | leader = timr->it_process->group_leader; |
| 318 | put_task_struct(timr->it_process); |
| 319 | timr->it_process = leader; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | } |
Oleg Nesterov | e752dd6 | 2005-09-06 15:17:42 -0700 | [diff] [blame] | 321 | |
| 322 | return send_group_sigqueue(timr->it_sigev_signo, timr->sigq, |
| 323 | timr->it_process); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | } |
| 325 | EXPORT_SYMBOL_GPL(posix_timer_event); |
| 326 | |
| 327 | /* |
| 328 | * This function gets called when a POSIX.1b interval timer expires. It |
| 329 | * is used as a callback from the kernel internal timer. The |
| 330 | * run_timer_list code ALWAYS calls with interrupts on. |
| 331 | |
| 332 | * This code is for CLOCK_REALTIME* and CLOCK_MONOTONIC* timers. |
| 333 | */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 334 | static int posix_timer_fn(void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 336 | struct k_itimer *timr = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | unsigned long flags; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 338 | int si_private = 0; |
| 339 | int ret = HRTIMER_NORESTART; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
| 341 | spin_lock_irqsave(&timr->it_lock, flags); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 342 | |
| 343 | if (timr->it.real.interval.tv64 != 0) |
| 344 | si_private = ++timr->it_requeue_pending; |
| 345 | |
| 346 | if (posix_timer_event(timr, si_private)) { |
| 347 | /* |
| 348 | * signal was not sent because of sig_ignor |
| 349 | * we will not get a call back to restart it AND |
| 350 | * it should be restarted. |
| 351 | */ |
| 352 | if (timr->it.real.interval.tv64 != 0) { |
| 353 | timr->it_overrun += |
| 354 | hrtimer_forward(&timr->it.real.timer, |
| 355 | timr->it.real.interval); |
| 356 | ret = HRTIMER_RESTART; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 360 | unlock_timer(timr, flags); |
| 361 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | } |
| 363 | |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 364 | static struct task_struct * good_sigevent(sigevent_t * event) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | { |
| 366 | struct task_struct *rtn = current->group_leader; |
| 367 | |
| 368 | if ((event->sigev_notify & SIGEV_THREAD_ID ) && |
| 369 | (!(rtn = find_task_by_pid(event->sigev_notify_thread_id)) || |
| 370 | rtn->tgid != current->tgid || |
| 371 | (event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_SIGNAL)) |
| 372 | return NULL; |
| 373 | |
| 374 | if (((event->sigev_notify & ~SIGEV_THREAD_ID) != SIGEV_NONE) && |
| 375 | ((event->sigev_signo <= 0) || (event->sigev_signo > SIGRTMAX))) |
| 376 | return NULL; |
| 377 | |
| 378 | return rtn; |
| 379 | } |
| 380 | |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 381 | void register_posix_clock(const clockid_t clock_id, struct k_clock *new_clock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | { |
| 383 | if ((unsigned) clock_id >= MAX_CLOCKS) { |
| 384 | printk("POSIX clock register failed for clock_id %d\n", |
| 385 | clock_id); |
| 386 | return; |
| 387 | } |
| 388 | |
| 389 | posix_clocks[clock_id] = *new_clock; |
| 390 | } |
| 391 | EXPORT_SYMBOL_GPL(register_posix_clock); |
| 392 | |
| 393 | static struct k_itimer * alloc_posix_timer(void) |
| 394 | { |
| 395 | struct k_itimer *tmr; |
| 396 | tmr = kmem_cache_alloc(posix_timers_cache, GFP_KERNEL); |
| 397 | if (!tmr) |
| 398 | return tmr; |
| 399 | memset(tmr, 0, sizeof (struct k_itimer)); |
| 400 | if (unlikely(!(tmr->sigq = sigqueue_alloc()))) { |
| 401 | kmem_cache_free(posix_timers_cache, tmr); |
| 402 | tmr = NULL; |
| 403 | } |
| 404 | return tmr; |
| 405 | } |
| 406 | |
| 407 | #define IT_ID_SET 1 |
| 408 | #define IT_ID_NOT_SET 0 |
| 409 | static void release_posix_timer(struct k_itimer *tmr, int it_id_set) |
| 410 | { |
| 411 | if (it_id_set) { |
| 412 | unsigned long flags; |
| 413 | spin_lock_irqsave(&idr_lock, flags); |
| 414 | idr_remove(&posix_timers_id, tmr->it_id); |
| 415 | spin_unlock_irqrestore(&idr_lock, flags); |
| 416 | } |
| 417 | sigqueue_free(tmr->sigq); |
| 418 | if (unlikely(tmr->it_process) && |
| 419 | tmr->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID)) |
| 420 | put_task_struct(tmr->it_process); |
| 421 | kmem_cache_free(posix_timers_cache, tmr); |
| 422 | } |
| 423 | |
| 424 | /* Create a POSIX.1b interval timer. */ |
| 425 | |
| 426 | asmlinkage long |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 427 | sys_timer_create(const clockid_t which_clock, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | struct sigevent __user *timer_event_spec, |
| 429 | timer_t __user * created_timer_id) |
| 430 | { |
| 431 | int error = 0; |
| 432 | struct k_itimer *new_timer = NULL; |
| 433 | int new_timer_id; |
| 434 | struct task_struct *process = NULL; |
| 435 | unsigned long flags; |
| 436 | sigevent_t event; |
| 437 | int it_id_set = IT_ID_NOT_SET; |
| 438 | |
| 439 | if (invalid_clockid(which_clock)) |
| 440 | return -EINVAL; |
| 441 | |
| 442 | new_timer = alloc_posix_timer(); |
| 443 | if (unlikely(!new_timer)) |
| 444 | return -EAGAIN; |
| 445 | |
| 446 | spin_lock_init(&new_timer->it_lock); |
| 447 | retry: |
| 448 | if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) { |
| 449 | error = -EAGAIN; |
| 450 | goto out; |
| 451 | } |
| 452 | spin_lock_irq(&idr_lock); |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 453 | error = idr_get_new(&posix_timers_id, (void *) new_timer, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | &new_timer_id); |
| 455 | spin_unlock_irq(&idr_lock); |
| 456 | if (error == -EAGAIN) |
| 457 | goto retry; |
| 458 | else if (error) { |
| 459 | /* |
| 460 | * Wierd looking, but we return EAGAIN if the IDR is |
| 461 | * full (proper POSIX return value for this) |
| 462 | */ |
| 463 | error = -EAGAIN; |
| 464 | goto out; |
| 465 | } |
| 466 | |
| 467 | it_id_set = IT_ID_SET; |
| 468 | new_timer->it_id = (timer_t) new_timer_id; |
| 469 | new_timer->it_clock = which_clock; |
| 470 | new_timer->it_overrun = -1; |
| 471 | error = CLOCK_DISPATCH(which_clock, timer_create, (new_timer)); |
| 472 | if (error) |
| 473 | goto out; |
| 474 | |
| 475 | /* |
| 476 | * return the timer_id now. The next step is hard to |
| 477 | * back out if there is an error. |
| 478 | */ |
| 479 | if (copy_to_user(created_timer_id, |
| 480 | &new_timer_id, sizeof (new_timer_id))) { |
| 481 | error = -EFAULT; |
| 482 | goto out; |
| 483 | } |
| 484 | if (timer_event_spec) { |
| 485 | if (copy_from_user(&event, timer_event_spec, sizeof (event))) { |
| 486 | error = -EFAULT; |
| 487 | goto out; |
| 488 | } |
| 489 | new_timer->it_sigev_notify = event.sigev_notify; |
| 490 | new_timer->it_sigev_signo = event.sigev_signo; |
| 491 | new_timer->it_sigev_value = event.sigev_value; |
| 492 | |
| 493 | read_lock(&tasklist_lock); |
| 494 | if ((process = good_sigevent(&event))) { |
| 495 | /* |
| 496 | * We may be setting up this process for another |
| 497 | * thread. It may be exiting. To catch this |
| 498 | * case the we check the PF_EXITING flag. If |
| 499 | * the flag is not set, the siglock will catch |
| 500 | * him before it is too late (in exit_itimers). |
| 501 | * |
| 502 | * The exec case is a bit more invloved but easy |
| 503 | * to code. If the process is in our thread |
| 504 | * group (and it must be or we would not allow |
| 505 | * it here) and is doing an exec, it will cause |
| 506 | * us to be killed. In this case it will wait |
| 507 | * for us to die which means we can finish this |
| 508 | * linkage with our last gasp. I.e. no code :) |
| 509 | */ |
| 510 | spin_lock_irqsave(&process->sighand->siglock, flags); |
| 511 | if (!(process->flags & PF_EXITING)) { |
| 512 | new_timer->it_process = process; |
| 513 | list_add(&new_timer->list, |
| 514 | &process->signal->posix_timers); |
| 515 | spin_unlock_irqrestore(&process->sighand->siglock, flags); |
| 516 | if (new_timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID)) |
| 517 | get_task_struct(process); |
| 518 | } else { |
| 519 | spin_unlock_irqrestore(&process->sighand->siglock, flags); |
| 520 | process = NULL; |
| 521 | } |
| 522 | } |
| 523 | read_unlock(&tasklist_lock); |
| 524 | if (!process) { |
| 525 | error = -EINVAL; |
| 526 | goto out; |
| 527 | } |
| 528 | } else { |
| 529 | new_timer->it_sigev_notify = SIGEV_SIGNAL; |
| 530 | new_timer->it_sigev_signo = SIGALRM; |
| 531 | new_timer->it_sigev_value.sival_int = new_timer->it_id; |
| 532 | process = current->group_leader; |
| 533 | spin_lock_irqsave(&process->sighand->siglock, flags); |
| 534 | new_timer->it_process = process; |
| 535 | list_add(&new_timer->list, &process->signal->posix_timers); |
| 536 | spin_unlock_irqrestore(&process->sighand->siglock, flags); |
| 537 | } |
| 538 | |
| 539 | /* |
| 540 | * In the case of the timer belonging to another task, after |
| 541 | * the task is unlocked, the timer is owned by the other task |
| 542 | * and may cease to exist at any time. Don't use or modify |
| 543 | * new_timer after the unlock call. |
| 544 | */ |
| 545 | |
| 546 | out: |
| 547 | if (error) |
| 548 | release_posix_timer(new_timer, it_id_set); |
| 549 | |
| 550 | return error; |
| 551 | } |
| 552 | |
| 553 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | * Locking issues: We need to protect the result of the id look up until |
| 555 | * we get the timer locked down so it is not deleted under us. The |
| 556 | * removal is done under the idr spinlock so we use that here to bridge |
| 557 | * the find to the timer lock. To avoid a dead lock, the timer id MUST |
| 558 | * be release with out holding the timer lock. |
| 559 | */ |
| 560 | static struct k_itimer * lock_timer(timer_t timer_id, unsigned long *flags) |
| 561 | { |
| 562 | struct k_itimer *timr; |
| 563 | /* |
| 564 | * Watch out here. We do a irqsave on the idr_lock and pass the |
| 565 | * flags part over to the timer lock. Must not let interrupts in |
| 566 | * while we are moving the lock. |
| 567 | */ |
| 568 | |
| 569 | spin_lock_irqsave(&idr_lock, *flags); |
| 570 | timr = (struct k_itimer *) idr_find(&posix_timers_id, (int) timer_id); |
| 571 | if (timr) { |
| 572 | spin_lock(&timr->it_lock); |
| 573 | spin_unlock(&idr_lock); |
| 574 | |
| 575 | if ((timr->it_id != timer_id) || !(timr->it_process) || |
| 576 | timr->it_process->tgid != current->tgid) { |
| 577 | unlock_timer(timr, *flags); |
| 578 | timr = NULL; |
| 579 | } |
| 580 | } else |
| 581 | spin_unlock_irqrestore(&idr_lock, *flags); |
| 582 | |
| 583 | return timr; |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * Get the time remaining on a POSIX.1b interval timer. This function |
| 588 | * is ALWAYS called with spin_lock_irq on the timer, thus it must not |
| 589 | * mess with irq. |
| 590 | * |
| 591 | * We have a couple of messes to clean up here. First there is the case |
| 592 | * of a timer that has a requeue pending. These timers should appear to |
| 593 | * be in the timer list with an expiry as if we were to requeue them |
| 594 | * now. |
| 595 | * |
| 596 | * The second issue is the SIGEV_NONE timer which may be active but is |
| 597 | * not really ever put in the timer list (to save system resources). |
| 598 | * This timer may be expired, and if so, we will do it here. Otherwise |
| 599 | * it is the same as a requeue pending timer WRT to what we should |
| 600 | * report. |
| 601 | */ |
| 602 | static void |
| 603 | common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting) |
| 604 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 605 | ktime_t remaining; |
| 606 | struct hrtimer *timer = &timr->it.real.timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 608 | memset(cur_setting, 0, sizeof(struct itimerspec)); |
| 609 | remaining = hrtimer_get_remaining(timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 611 | /* Time left ? or timer pending */ |
| 612 | if (remaining.tv64 > 0 || hrtimer_active(timer)) |
| 613 | goto calci; |
| 614 | /* interval timer ? */ |
| 615 | if (timr->it.real.interval.tv64 == 0) |
| 616 | return; |
| 617 | /* |
| 618 | * When a requeue is pending or this is a SIGEV_NONE timer |
| 619 | * move the expiry time forward by intervals, so expiry is > |
| 620 | * now. |
| 621 | */ |
| 622 | if (timr->it_requeue_pending & REQUEUE_PENDING || |
| 623 | (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE) { |
| 624 | timr->it_overrun += |
| 625 | hrtimer_forward(timer, timr->it.real.interval); |
| 626 | remaining = hrtimer_get_remaining(timer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 628 | calci: |
| 629 | /* interval timer ? */ |
| 630 | if (timr->it.real.interval.tv64 != 0) |
| 631 | cur_setting->it_interval = |
| 632 | ktime_to_timespec(timr->it.real.interval); |
| 633 | /* Return 0 only, when the timer is expired and not pending */ |
| 634 | if (remaining.tv64 <= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | cur_setting->it_value.tv_nsec = 1; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 636 | else |
| 637 | cur_setting->it_value = ktime_to_timespec(remaining); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | } |
| 639 | |
| 640 | /* Get the time remaining on a POSIX.1b interval timer. */ |
| 641 | asmlinkage long |
| 642 | sys_timer_gettime(timer_t timer_id, struct itimerspec __user *setting) |
| 643 | { |
| 644 | struct k_itimer *timr; |
| 645 | struct itimerspec cur_setting; |
| 646 | unsigned long flags; |
| 647 | |
| 648 | timr = lock_timer(timer_id, &flags); |
| 649 | if (!timr) |
| 650 | return -EINVAL; |
| 651 | |
| 652 | CLOCK_DISPATCH(timr->it_clock, timer_get, (timr, &cur_setting)); |
| 653 | |
| 654 | unlock_timer(timr, flags); |
| 655 | |
| 656 | if (copy_to_user(setting, &cur_setting, sizeof (cur_setting))) |
| 657 | return -EFAULT; |
| 658 | |
| 659 | return 0; |
| 660 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 661 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | /* |
| 663 | * Get the number of overruns of a POSIX.1b interval timer. This is to |
| 664 | * be the overrun of the timer last delivered. At the same time we are |
| 665 | * accumulating overruns on the next timer. The overrun is frozen when |
| 666 | * the signal is delivered, either at the notify time (if the info block |
| 667 | * is not queued) or at the actual delivery time (as we are informed by |
| 668 | * the call back to do_schedule_next_timer(). So all we need to do is |
| 669 | * to pick up the frozen overrun. |
| 670 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | asmlinkage long |
| 672 | sys_timer_getoverrun(timer_t timer_id) |
| 673 | { |
| 674 | struct k_itimer *timr; |
| 675 | int overrun; |
| 676 | long flags; |
| 677 | |
| 678 | timr = lock_timer(timer_id, &flags); |
| 679 | if (!timr) |
| 680 | return -EINVAL; |
| 681 | |
| 682 | overrun = timr->it_overrun_last; |
| 683 | unlock_timer(timr, flags); |
| 684 | |
| 685 | return overrun; |
| 686 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | |
| 688 | /* Set a POSIX.1b interval timer. */ |
| 689 | /* timr->it_lock is taken. */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 690 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | common_timer_set(struct k_itimer *timr, int flags, |
| 692 | struct itimerspec *new_setting, struct itimerspec *old_setting) |
| 693 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 694 | struct hrtimer *timer = &timr->it.real.timer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | |
| 696 | if (old_setting) |
| 697 | common_timer_get(timr, old_setting); |
| 698 | |
| 699 | /* disable the timer */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 700 | timr->it.real.interval.tv64 = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | /* |
| 702 | * careful here. If smp we could be in the "fire" routine which will |
| 703 | * be spinning as we hold the lock. But this is ONLY an SMP issue. |
| 704 | */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 705 | if (hrtimer_try_to_cancel(timer) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | return TIMER_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
| 708 | timr->it_requeue_pending = (timr->it_requeue_pending + 2) & |
| 709 | ~REQUEUE_PENDING; |
| 710 | timr->it_overrun_last = 0; |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 711 | |
| 712 | /* switch off the timer when it_value is zero */ |
| 713 | if (!new_setting->it_value.tv_sec && !new_setting->it_value.tv_nsec) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 716 | /* Posix madness. Only absolute CLOCK_REALTIME timers |
| 717 | * are affected by clock sets. So we must reiniatilize |
| 718 | * the timer. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 720 | if (timr->it_clock == CLOCK_REALTIME && (flags & TIMER_ABSTIME)) |
| 721 | hrtimer_rebase(timer, CLOCK_REALTIME); |
| 722 | else |
| 723 | hrtimer_rebase(timer, CLOCK_MONOTONIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 725 | timer->expires = timespec_to_ktime(new_setting->it_value); |
| 726 | |
| 727 | /* Convert interval */ |
| 728 | timr->it.real.interval = timespec_to_ktime(new_setting->it_interval); |
| 729 | |
| 730 | /* SIGEV_NONE timers are not queued ! See common_timer_get */ |
| 731 | if (((timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE)) |
| 732 | return 0; |
| 733 | |
| 734 | hrtimer_start(timer, timer->expires, (flags & TIMER_ABSTIME) ? |
| 735 | HRTIMER_ABS : HRTIMER_REL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | return 0; |
| 737 | } |
| 738 | |
| 739 | /* Set a POSIX.1b interval timer */ |
| 740 | asmlinkage long |
| 741 | sys_timer_settime(timer_t timer_id, int flags, |
| 742 | const struct itimerspec __user *new_setting, |
| 743 | struct itimerspec __user *old_setting) |
| 744 | { |
| 745 | struct k_itimer *timr; |
| 746 | struct itimerspec new_spec, old_spec; |
| 747 | int error = 0; |
| 748 | long flag; |
| 749 | struct itimerspec *rtn = old_setting ? &old_spec : NULL; |
| 750 | |
| 751 | if (!new_setting) |
| 752 | return -EINVAL; |
| 753 | |
| 754 | if (copy_from_user(&new_spec, new_setting, sizeof (new_spec))) |
| 755 | return -EFAULT; |
| 756 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 757 | if (!timespec_valid(&new_spec.it_interval) || |
| 758 | !timespec_valid(&new_spec.it_value)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | return -EINVAL; |
| 760 | retry: |
| 761 | timr = lock_timer(timer_id, &flag); |
| 762 | if (!timr) |
| 763 | return -EINVAL; |
| 764 | |
| 765 | error = CLOCK_DISPATCH(timr->it_clock, timer_set, |
| 766 | (timr, flags, &new_spec, rtn)); |
| 767 | |
| 768 | unlock_timer(timr, flag); |
| 769 | if (error == TIMER_RETRY) { |
| 770 | rtn = NULL; // We already got the old time... |
| 771 | goto retry; |
| 772 | } |
| 773 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 774 | if (old_setting && !error && |
| 775 | copy_to_user(old_setting, &old_spec, sizeof (old_spec))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | error = -EFAULT; |
| 777 | |
| 778 | return error; |
| 779 | } |
| 780 | |
| 781 | static inline int common_timer_del(struct k_itimer *timer) |
| 782 | { |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 783 | timer->it.real.interval.tv64 = 0; |
Oleg Nesterov | f972be3 | 2005-06-23 00:09:00 -0700 | [diff] [blame] | 784 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 785 | if (hrtimer_try_to_cancel(&timer->it.real.timer) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | return TIMER_RETRY; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | return 0; |
| 788 | } |
| 789 | |
| 790 | static inline int timer_delete_hook(struct k_itimer *timer) |
| 791 | { |
| 792 | return CLOCK_DISPATCH(timer->it_clock, timer_del, (timer)); |
| 793 | } |
| 794 | |
| 795 | /* Delete a POSIX.1b interval timer. */ |
| 796 | asmlinkage long |
| 797 | sys_timer_delete(timer_t timer_id) |
| 798 | { |
| 799 | struct k_itimer *timer; |
| 800 | long flags; |
| 801 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | retry_delete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | timer = lock_timer(timer_id, &flags); |
| 804 | if (!timer) |
| 805 | return -EINVAL; |
| 806 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 807 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | unlock_timer(timer, flags); |
| 809 | goto retry_delete; |
| 810 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | spin_lock(¤t->sighand->siglock); |
| 813 | list_del(&timer->list); |
| 814 | spin_unlock(¤t->sighand->siglock); |
| 815 | /* |
| 816 | * This keeps any tasks waiting on the spin lock from thinking |
| 817 | * they got something (see the lock code above). |
| 818 | */ |
| 819 | if (timer->it_process) { |
| 820 | if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID)) |
| 821 | put_task_struct(timer->it_process); |
| 822 | timer->it_process = NULL; |
| 823 | } |
| 824 | unlock_timer(timer, flags); |
| 825 | release_posix_timer(timer, IT_ID_SET); |
| 826 | return 0; |
| 827 | } |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 828 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | /* |
| 830 | * return timer owned by the process, used by exit_itimers |
| 831 | */ |
Arjan van de Ven | 858119e | 2006-01-14 13:20:43 -0800 | [diff] [blame] | 832 | static void itimer_delete(struct k_itimer *timer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | { |
| 834 | unsigned long flags; |
| 835 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | retry_delete: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | spin_lock_irqsave(&timer->it_lock, flags); |
| 838 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 839 | if (timer_delete_hook(timer) == TIMER_RETRY) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | unlock_timer(timer, flags); |
| 841 | goto retry_delete; |
| 842 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | list_del(&timer->list); |
| 844 | /* |
| 845 | * This keeps any tasks waiting on the spin lock from thinking |
| 846 | * they got something (see the lock code above). |
| 847 | */ |
| 848 | if (timer->it_process) { |
| 849 | if (timer->it_sigev_notify == (SIGEV_SIGNAL|SIGEV_THREAD_ID)) |
| 850 | put_task_struct(timer->it_process); |
| 851 | timer->it_process = NULL; |
| 852 | } |
| 853 | unlock_timer(timer, flags); |
| 854 | release_posix_timer(timer, IT_ID_SET); |
| 855 | } |
| 856 | |
| 857 | /* |
Roland McGrath | 25f407f | 2005-10-21 15:03:29 -0700 | [diff] [blame] | 858 | * This is called by do_exit or de_thread, only when there are no more |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | * references to the shared signal_struct. |
| 860 | */ |
| 861 | void exit_itimers(struct signal_struct *sig) |
| 862 | { |
| 863 | struct k_itimer *tmr; |
| 864 | |
| 865 | while (!list_empty(&sig->posix_timers)) { |
| 866 | tmr = list_entry(sig->posix_timers.next, struct k_itimer, list); |
| 867 | itimer_delete(tmr); |
| 868 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | } |
| 870 | |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 871 | /* Not available / possible... functions */ |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 872 | int do_posix_clock_nosettime(const clockid_t clockid, struct timespec *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | { |
| 874 | return -EINVAL; |
| 875 | } |
| 876 | EXPORT_SYMBOL_GPL(do_posix_clock_nosettime); |
| 877 | |
| 878 | int do_posix_clock_notimer_create(struct k_itimer *timer) |
| 879 | { |
| 880 | return -EINVAL; |
| 881 | } |
| 882 | EXPORT_SYMBOL_GPL(do_posix_clock_notimer_create); |
| 883 | |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 884 | int do_posix_clock_nonanosleep(const clockid_t clock, int flags, |
Thomas Gleixner | 97735f2 | 2006-01-09 20:52:37 -0800 | [diff] [blame] | 885 | struct timespec *t, struct timespec __user *r) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | { |
| 887 | #ifndef ENOTSUP |
| 888 | return -EOPNOTSUPP; /* aka ENOTSUP in userland for POSIX */ |
| 889 | #else /* parisc does define it separately. */ |
| 890 | return -ENOTSUP; |
| 891 | #endif |
| 892 | } |
| 893 | EXPORT_SYMBOL_GPL(do_posix_clock_nonanosleep); |
| 894 | |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 895 | asmlinkage long sys_clock_settime(const clockid_t which_clock, |
| 896 | const struct timespec __user *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | { |
| 898 | struct timespec new_tp; |
| 899 | |
| 900 | if (invalid_clockid(which_clock)) |
| 901 | return -EINVAL; |
| 902 | if (copy_from_user(&new_tp, tp, sizeof (*tp))) |
| 903 | return -EFAULT; |
| 904 | |
| 905 | return CLOCK_DISPATCH(which_clock, clock_set, (which_clock, &new_tp)); |
| 906 | } |
| 907 | |
| 908 | asmlinkage long |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 909 | sys_clock_gettime(const clockid_t which_clock, struct timespec __user *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | { |
| 911 | struct timespec kernel_tp; |
| 912 | int error; |
| 913 | |
| 914 | if (invalid_clockid(which_clock)) |
| 915 | return -EINVAL; |
| 916 | error = CLOCK_DISPATCH(which_clock, clock_get, |
| 917 | (which_clock, &kernel_tp)); |
| 918 | if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp))) |
| 919 | error = -EFAULT; |
| 920 | |
| 921 | return error; |
| 922 | |
| 923 | } |
| 924 | |
| 925 | asmlinkage long |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 926 | sys_clock_getres(const clockid_t which_clock, struct timespec __user *tp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | { |
| 928 | struct timespec rtn_tp; |
| 929 | int error; |
| 930 | |
| 931 | if (invalid_clockid(which_clock)) |
| 932 | return -EINVAL; |
| 933 | |
| 934 | error = CLOCK_DISPATCH(which_clock, clock_getres, |
| 935 | (which_clock, &rtn_tp)); |
| 936 | |
| 937 | if (!error && tp && copy_to_user(tp, &rtn_tp, sizeof (rtn_tp))) { |
| 938 | error = -EFAULT; |
| 939 | } |
| 940 | |
| 941 | return error; |
| 942 | } |
| 943 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | /* |
Thomas Gleixner | 97735f2 | 2006-01-09 20:52:37 -0800 | [diff] [blame] | 945 | * nanosleep for monotonic and realtime clocks |
| 946 | */ |
| 947 | static int common_nsleep(const clockid_t which_clock, int flags, |
| 948 | struct timespec *tsave, struct timespec __user *rmtp) |
| 949 | { |
| 950 | int mode = flags & TIMER_ABSTIME ? HRTIMER_ABS : HRTIMER_REL; |
| 951 | int clockid = which_clock; |
| 952 | |
| 953 | switch (which_clock) { |
| 954 | case CLOCK_REALTIME: |
| 955 | /* Posix madness. Only absolute timers on clock realtime |
| 956 | are affected by clock set. */ |
Thomas Gleixner | becf8b5 | 2006-01-09 20:52:38 -0800 | [diff] [blame] | 957 | if (mode != HRTIMER_ABS) |
Thomas Gleixner | 97735f2 | 2006-01-09 20:52:37 -0800 | [diff] [blame] | 958 | clockid = CLOCK_MONOTONIC; |
| 959 | case CLOCK_MONOTONIC: |
| 960 | break; |
| 961 | default: |
| 962 | return -EINVAL; |
| 963 | } |
| 964 | return hrtimer_nanosleep(tsave, rmtp, mode, clockid); |
| 965 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | |
| 967 | asmlinkage long |
Thomas Gleixner | a924b04 | 2006-01-09 20:52:27 -0800 | [diff] [blame] | 968 | sys_clock_nanosleep(const clockid_t which_clock, int flags, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | const struct timespec __user *rqtp, |
| 970 | struct timespec __user *rmtp) |
| 971 | { |
| 972 | struct timespec t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
| 974 | if (invalid_clockid(which_clock)) |
| 975 | return -EINVAL; |
| 976 | |
| 977 | if (copy_from_user(&t, rqtp, sizeof (struct timespec))) |
| 978 | return -EFAULT; |
| 979 | |
Thomas Gleixner | 5f82b2b | 2006-01-09 20:52:29 -0800 | [diff] [blame] | 980 | if (!timespec_valid(&t)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 981 | return -EINVAL; |
| 982 | |
Thomas Gleixner | 97735f2 | 2006-01-09 20:52:37 -0800 | [diff] [blame] | 983 | return CLOCK_DISPATCH(which_clock, nsleep, |
| 984 | (which_clock, flags, &t, rmtp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | } |