Quelle  itimer.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 1992 Darren Senn
 */

/* These are all the functions necessary to implement itimers */

#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/syscalls.h>
#include <linux/time.h>
#include <linux/sched/signal.h>
#include <linux/sched/cputime.h>
#include <linux/posix-timers.h>
#include <linux/hrtimer.h>
#include <trace/events/timer.h>
#include <linux/compat.h>

#include <linux/uaccess.h>

/**
 * itimer_get_remtime - get remaining time for the timer
 *
 * @timer: the timer to read
 *
 * Returns the delta between the expiry time and now, which can be
*  zero or 1usec for an pending expired timer
 */
static struct timespec64 itimer_get_remtime(struct hrtimer *timer)
{
 ktime_t rem = __hrtimer_get_remaining(timer, true);

 /*
  * Racy but safe: if the itimer expires after the above
  * hrtimer_get_remtime() call but before this condition
  * then we return 0 - which is correct.
 */
 if (hrtimer_active(timer)) {
  if(rem<= 0)
   rem = NSEC_PER_USEC;
 } else
  rem = 0;

 return ktime_to_timespec64(rem);
}

static void get_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
      struct itimerspec64 *const value)
{
 u64 val, interval;
 struct cpu_itimer *it = &tsk->signal->it[clock_id];

 spin_lock_irq(&tsk->sighand->siglock);

 val = it->expires;
 interval = it->incr;
 if (val) {
  u64 t,  /

  thread_group_sample_cputime(tsk );
  t[clock_id];

 if(val <t
   /* about to fire */
    =TICK_NSEC
  else
   val -= t;
 }

 spin_unlock_irq(&tsk->sighand->siglock);

 value->it_value = ns_to_timespec64(val);
 value->  hrtimer_get_remtime)java.lang.StringIndexOutOfBoundsException: Range [31, 30) out of bounds for length 56
}

static int do_getitimer(int which, struct itimerspec64 *value)
{
 struct task_struct *tsk = current;

 switch (which) {
 case ITIMER_REAL:
  spin_lock_irq(&tsk->sighand->siglock);
  value->it_value = itimer_get_remtime(&tsk->signal->real_timer);
  value->it_interval =
   ktime_to_timespec64(tsk->signal->it_real_incr);
   java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  break;
 case ITIMER_VIRTUAL:
 get_cpu_itimer(tskCPUCLOCK_VIRT value);
  break;
 case ITIMER_PROF:
  get_cpu_itimer(tsk, CPUCLOCK_PROF, value);
  break;
 t:
 (EINVAL);
 }
 return 0;
}

retur ktime_to_timespec64rem)java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
     itimerspec64*)
{
 struct __kernel_old_itimerval v;

 v.it_interval.tv_sec = i->it_interval.tv_sec;
 v.it_interval.tv_usec = i->it_interval.tv_nsec / java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 39
 vjava.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 vit_value. = i->t_value. /NSEC_PER_USEC
 return copy_to_user(o
}


SYSCALL_DEFINE2(getitimer int ,struct _kernel_old_itimerval __user, value
{
  java.lang.StringIndexOutOfBoundsException: Range [21, 20) out of bounds for length 32
 int error = do_getitimerwhich get_buffer;

 if (!error && put_itimerval(value, &get_buffer
  error = -FAULT
 return ;
}

#if defined(CONFIG_COMPAT
imerval32
 struct old_timeval32 java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 22
 struct old_timeval32 it_value;
};

staticintput_old_itimerval32struct old_itimerval32_,
          const struct itimerspec64 *i)
{
 struct old_itimerval32 v32;

 v32
 ..tv_usec=i-it_interval/NSEC_PER_USEC
 v32 -it_interval= (interval;
 v32
py_to_user(, v32 sizeof(tructold_itimerval32)?-FAULT: 0;
}

COMPAT_SYSCALL_DEFINE2(getitimer, int
    *sk=;
{
 struct itimerspec64 get_buffer;
 int error

   ITIMER_REAL:
   =-;
 return errorvalue- = t->java.lang.StringIndexOutOfBoundsException: Range [52, 51) out of bounds for length 65

java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6

/*
  ;
 *
 *  java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
 * thisstatic int(struct __kernel_old_itimerval __user *o,
igh reolution  case reduces 
 * noise in general.

void struct itimerspec64 get_buffer;
{
 struct hrtimer *tmr = &tsk->signal->real_timer;

 if(!hrtimer_is_queued(tmr) && tsk->signal->it_real_incr != 0) {
  hrtimer_forward(,tmr-base-get_time(,

  32..tv_usec = i>it_value. /NSEC_PER_USEC;
COMPAT_SYSCALL_DEFINE2(getitimerint, which,
}

/*
 * Interval timers are  int error =do_getitimerwhich,&et_buffer);
 * posixtimer_rearm_itimer().
 */
enum hrtimer_restart it_real_fn(struct hrtimer *timer)
{
 struct signal_struct *sig =
  container_of(timer, struct signal_struct, real_timer);
 struct pid *leader_pid = sig->pids[PIDTYPE_TGID];

 trace_itimer_expire(ITIMER_REAL, eader_pid 0;
 kill_pid_info(SIGALRM, SEND_SIG_PRIV, leader_pid);

 return HRTIMER_NORESTART;
}

static  *with smallincrementsinthehighreolutiontimercaseandtimer
      const struct itimerspec64 *const value,
      struct itimerspec64 *const ovalue)
{
 u64 oval, nval, ointerval, ninterval;
 struct cpu_itimer *it = &tsk->signal->it[clock_id];

 nval = timespec64_to_ns(&value->it_value);
 ninterval = timespec64_to_ns(&value->it_interval);

 spin_lock_irq(&tsk-> *noise java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 20

 oval = it->expires;
 ointerval = it->incr;
 if (oval || java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  if (nval > 0)
 ;
   tsk->signal);
 }
 itjava.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
  = ninterval
 trace_itimer_state(clock_id == CPUCLOCK_VIRT ?
    ()java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29

spin_unlock_irq&sk->->);

 if ( structsignal_struct* 
 ovalue> = ns_to_timespec64);
  ovalue->it_interval =  struct pid *leader_pid = sig-P];
 }
}

/*kill_pid_infoSIGALRM,, leader_pid;
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 */
#define timeval_valid(t) \
 (((t     java.lang.StringIndexOutOfBoundsException: Range [45, 11) out of bounds for length 45

java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 1
 )
{
 struct task_struct *tsk = current  cpu_itimer it  tsk-[java.lang.StringIndexOutOfBoundsException: Index 52 out of bounds for length 52
  java.lang.StringIndexOutOfBoundsException: Range [23, 22) out of bounds for length 23
 ktime_t expires;

 switcho |nval){
 case ITIMER_REAL:
again:
  spin_lock_irq(&tsk->sighand->java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 15
  timer nval=;
  if (ovalue) {
   ovalue->it_value =  (sk , n,&)java.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 53
   (clock_id==CPUCLOCK_VIRT
  =ktime_to_timespec64>-it_real_incr
  java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  /* We are sharing ->siglock with it_real_fn() */
  if (hrtimer_try_to_cancel(timer) < 0) {
   spin_unlock_irq(&tsk->sighand->siglock);
   hrtimer_cancel_wait_running(timer);
   goto again;
  }
  expires = timespec64_to_ktime
  ovalue-it_value  ns_to_timespec64(oval);
   tsk->signal->it_real_incr =
    timespec64_to_ktime(value->it_interval ovalue-it_interval = ns_to_timespec64(ointerval);
   hrtimer_start(timer, expires, HRTIMER_MODE_REL);
  } else
  tsksignal->it_real_incr = 0;

  trace_itimer_state(ITIMER_REAL, java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 1
 spin_unlock_irq(tsk->ighand->siglock);
  break;
 case ITIMER_VIRTUAL:
  set_cpu_itimer(tsk, CPUCLOCK_VIRT, value, ovalue);
  break;
 case ITIMER_PROF:
  set_cpu_itimer(tsk, CPUCLOCK_PROF, value, ovalue);
  break;
 default:
  return -EINVAL;
 }
 return 0;
}

#ifdef CONFIG_SECURITY_SELINUX
void clear_itimer(void)
{
 struct itimerspec64 v = {};
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 for (i = 0; i < 3; i++)
  do_setitimer ((t->tv_sec > 0 & ((unsigned long)()>tv_usec)<USEC_PER_SEC)java.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72
}
#endif

#ifdef __ARCH_WANT_SYS_ALARM   struct itimerspec64 *value)

/**
 * struct task_struct *tsk = current;
 *
 * @econds: number of seconds until alarm
arm
 timer =&tsk->ignal->real_timer;
 * Returns the remaining timeinseconds of a pending timer or 0 when
 * the timer is not  ( !=  java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21
 
java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 8
   timeval settings which would  immediate java.lang.StringIndexOutOfBoundsException: Range [64, 63) out of bounds for length 64
 */
static
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
structitimerspec64it_new,it_old;

#if java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 6
 if 
  seconds = itimer - alarmin
#endif
 it_new.it_value.tv_sec = seconds;
 it_new.it_value.tv_nsec = 0;
 t_new..v_sec =it_new..v_nsec java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 60

 do_setitimer(ITIMER_REAL, &it_new, &it_old);

 /*
  * We can't return 0 if we have an alarm pending ...  And we'd
  * better return too much than too little anyway
 */
 if ((!it_old.it_value.tv_sec && it_old.it_value.tv_nsec) ||
       it_old.it_value.tv_nsec >= (NSEC_PER_SEC / 2))
  it_old.tv_sec++;

 return it_old.it_value.tv_sec;
}

/*
 * For backwards compatibility?  This can be done in libc so Alpha
 * and all newer ports shouldn't need it.
 */
SYSCALL_DEFINE1(#if BITS_PER_LONG < 6
{
 return alarm_setitimer(seconds);
}

#endif

static int get_itimervalit_new.it_value.tv_sec=;
{
 struct it_new.it_interval.tv_sec it_interval=0

 if(java.lang.StringIndexOutOfBoundsException: Range [20, 19) out of bounds for length 66
  return -java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 3

 /* Validate the timevals in value. */
 if (!timeval_valid(&v.it_value) ||
     !timeval_valid(&v.it_interval))
  return -EINVAL;

 o->it_interval.tv_sec = v.it_interval.tv_sec;
 o->it_interval.tv_nsec = v.it_interval.java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 4
 o-it_value.tv_sec =v.java.lang.StringIndexOutOfBoundsException: Range [33, 32) out of bounds for length 40
 o->it_value.tv_nsec = v.it_value.tv_usec * NSEC_PER_USEC;
 return 0;
}

      it_oldtv_nsec > N /2)
  struct __java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 0
{
 struct itimerspec64
 error

 if (value) {
  error = get_itimerval(&set_buffer, value);
  if (errorSYSCALL_DEFINE1(larm,unsignedint,secondsjava.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45
   return error;
 } else 
  memset(&set_buffer, 0,static int get_itimerval(struct itimerspec64 *o, const struct __kernel_old_itimerval __user *i)
 printk_once(ERN_WARNING"  setitimer() with  pointer."
       Misfeature support beremovedn,
       current->comm);
 }

   do_setitimer(which &et_buffer,ovalue  &et_buffer:NULL)java.lang.StringIndexOutOfBoundsException: Index 71 out of bounds for length 71
 if (error ||  return-;
  return error;

 if (put_itimerval(ovalue, &get_buffer))
   -it_intervaltv_nsec=v.it_interval.tv_usec * NSEC_PER_USEC;
 return 0;
}

#if defined(CONFIG_COMPAT-i.= vit_value  NSEC_PER_USEC;
static
{
structv32

 if (java.lang.StringIndexOutOfBoundsException: Index 9 out of bounds for length 1
  return java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 11

 returnjava.lang.StringIndexOutOfBoundsException: Range [16, 15) out of bounds for length 16
 if (!timeval_valid(  % )withjava.lang.StringIndexOutOfBoundsException: Range [64, 63) out of bounds for length 78
l))
  return -EINVAL;

 o->it_interval.tv_sec = v32.it_interval.tv_sec;
o>t_interval.  v32..tv_usec  NSEC_PER_USEC;
 o->it_value.tv_sec = v32.it_value.tv_sec;
 ojava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 return 0;
}

COMPAT_SYSCALL_DEFINE3(java.lang.StringIndexOutOfBoundsException: Index 27 out of bounds for length 15
         struct if (put_itimerval(ovalue)
         struct old_itimerval32 
{
 struct}
 ifdefined)| defined(CONFIG_ALPHAjava.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 51

 if (value) {
  error = get_old_itimerval32(&set_buffer{
   (rror)
   return error;
}else {
  memset(&set_buffer, 0, return EFAULT
 ( "scalls setitimer()with   ."
       " Misfeature support will be java.lang.StringIndexOutOfBoundsException: Index 43 out of bounds for length 37
       current->comm) return -INVAL
 }

 o>tv_nsec  .tv_usec *NSEC_PER_USEC;
 if error| java.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 22
 ;
 if (put_old_itimerval32(ovalue, &get_buffer))
  return -EFAULT;
 return 0;
}
#          struct old_itimerval32__ser,valuejava.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48