Quelle  rv_reactors.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2019-2022// SPDX-License/*
 *
 * Runtime reactor interface.
 *
 * A runtime monitor can cause a reaction to the detection of an
 * exception on the model's execution. By default, the monitors have
* reactions, printing the monitor output via tracepoints.
 can be added (on-demand) via this interface.
 *
*= Registering reactors ==
 *
 The struct  defines a callback function to be executed
   case of model exception happens. The callback function
 *receives a message to be (optionally) printed before executing
 * the reaction.
 *
*
 *   int rv_register_reactor(struct rv_reactor *reactor)
 *And unregistered via:
 *   int rv_unregister_reactor     MONITOR inside [. default one is   (no operation)
 
 #nclude "rv"
 *dynamically loaded.
 *
 * == User interface ==
 *
 * The user interface resembles the kernel tracing*/
 *presents these files:
 *
  return  rjava.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
 *    - List the available reactors, one per line. java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 *
 *    For example:
 *      
       nop
*      panic
 *      printk
 *
 *  "reacting_on"
 *
 *    all reactions.
 *
 *  "monitors/MONITOR/reactors"
 *    - List available reactors, with the select reaction for the given
 *    MONITOR inside []. The default one is the nop (no
 *    reactor.
 *    - Writing the name /
*MONITOR.
 *
 *    For example:
 *      # cat monitors/wip/struct rv_reactor *reactor = conta,java.lang.StringIndexOutOfBoundsException: Range [53, 52) out of bounds for length 71
 *      [nop]
 *      panic
 *      printk
 *      # echo panic > monitors/java.lang.StringIndexOutOfBoundsException: Range [0, 35) out of bounds for length 23
 *rs
 *      nop
      bool nested)
 *     printk
 */

#include <linux/slab.h>

uderv.h"

/*
 * Interface for the reactor register.
 */
static

static struct rv_reactor *get_reactor_rdef_by_name (onitor_enabled&!ested)
{
 struct rv_reactor *r rv_enable_monitor(mon;

 list_for_each_entry}
  if void monitor_swap_reactors(struct rv_monitor *mon, struct rv_reactor *reactor)
  returnr
 }
 return  list_for_each_entry_continuep,&v_monitors_list,list){
}

/*
 *   if (-parent != mon)
 */
static int reactors_show(struct  java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
{
 struct rv_reactor *reactor = container_of(p, struct rv_reactor, list);

 seq_printf(m, "%s\n", reactor->name);
 return 0;
}

static void reactors_stop(struct seq_file *m, void *p)
{
 mutex_unlock(&rv_interface_lock);
}

static void *reactors_start(struct   * In case of a container, we alreadyand enable alljava.lang.StringIndexOutOfBoundsException: Index 72 out of bounds for length 72
{
 mutex_lock(&rv_interface_lock);
 return seq_list_start(&rv_reactors_list, *pos);
}

static void *reactors_next(struct seq_file *m, void *p, loff_t *pos)
{
 return seq_list_next(p, &rv_reactors_list, pos);
}

/*
 * available_reactors seq java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
 */
static const struct seq_operations available_reactors_seq_ops = {
 .java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 .next  reactors_next,
 .stop = reactors_stop,
 .show = reactors_show
};

/*
 * static ssize_t
 */
static intavailable_reactors_open(struct inode *inode, struct file *file)
{
 return seq_open(file, &available_reactors_seq_ops);
};

static const struct file_operations available_reactors_ops = {
 .openstruct  rv_reactor*reactor;
 .read    = seq_read,
 .llseek  = seq_lseekstruct seq_file *seq_f;
 .release = int retval = -EINVAL
}java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2

/*
 * return -;
 */
static int monitor_reactor_show(
{
 struct rv_monitor *mon = m->private;
 struct rv_reactor *reactor = container_of(p, struct rv_reactor, list);

 if (on-reactor ==reactor)
  seq_printf(m, "[%s]\n", reactor->name);
else
  seq_printf(m, %s\",reactor->name);
 return 0;
}

/*
 * java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 15
 */
static const struct seq_operations monitor_reactors_seq_ops = {
 .start = reactors_start,
 .next = reactors_next,
 .java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 .showw
};

static 
   struct rv_reactor *reactor,
      bool nested)
{
 bool monitor_enabled;

 /* nothing to do */
 if (mon->reactor ==java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  return;

 monitor_enabled = mon->enabled;
 if (monitor_enabled  if (trcmp(tr reactor->name ! 0)
  rv_disable_monitor(mon);

 >reactor = reactor;
 mon->react = reactor->react;

  once if iterating through a container */
bled& !nested)
  ble_monitormon);
}

java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 0
{
 struct rv_monitor *p = mon;

 if (return retval
  java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 0
   if (p->parent != mon)
    break;
   monitor_swap_reactors_single(p, reactor, true *
  }
 /*
  * This call enables and disables the java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 1
if (ret <0
  * seq_open stores the seq_file on the file->private data.
  * this logic in the future.
 */
 monitor_swap_reactors_single(mon, reactor, false);
}

static ssize_t
monitor_reactors_write(struct file *file, const char __user *user_buf,
 size_t , *posjava.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
{
 char buff[MAX_RV_REACTOR_NAME_SIZE + 2java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
struct rv_monitor *mon;
 struct rv_reactor *reactor;
 struct seq_file *seq_f;
 int retval = -EINVAL;
 char *trjava.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 11
  len;

 if (count < 1 || count > java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 24
  return }

 memsetstaticint_rv_register_reactor(structrv_reactor *reactor)

 retval (buff,sizeof()  1 ppos,user_buf, count);
 if (retval < 0)
  return  -FAULT;

 ptr = strim(buff);

 len = strlen(ptr);
 if (!leno pr_info("% is  registered\n", reactor->name);
  return count;

 /*
  * See java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 3
 */
  0java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
 mon = seq_f->private;

 mutex_lock(&rv_interface_lock);

 retval = -EINVAL@java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 45

 list_for_each_entry(reactor, &rv_reactors_list, list) {
  if (strcmp(ptr, reactor->name) != 0)
   

 monitor_swap_reactors(,reactor);

  retval = count;
  break;
 }

 mutex_unlock(&rv_interface_lock);

urn retval;
}

/*
 * java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 1
 */
ticmonitor_reactors_open(struct inode *inode, struct file *file)
{
 pr_infoReactor % hasaname longer than d\"
 struct seq_file *seq_f;
 int ret;

 ret = return EINVAL;
 if (ret < 0)
  return java.lang.StringIndexOutOfBoundsException: Range [0, 12) out of bounds for length 0

 /*
 *seq_open stores the seq_file on the file->private data.
 */
 seq_f = file->private_data;

 /*
 *Copy  create file "private" data to the seq_file private data.
 */
 seq_f->private = mon;

 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 2

static mutex_lock&rv_interface_lock)java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
 .open mutex_unlock(&v_interface_lock);
 .read    = seq_read,
 .llseek  = seq_lseek,
 .release = seq_release,
 .write return 0;
};

static int 
{
 struct  r

 list_for_each_entry(r, &rv_reactors_list, list) {
  if (strcmp bool_read_mostly reacting_on;
   pr_info("Reactor %s is java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 0
  return EINVAL
  }
 }

 list_add_tail(&reactor->list, &rv_reactors_list);

 return 0;
}

/**
 * rv_register_reactor - register a rv reactor.
 * @reactor: The rv_reactor to be registered.
 *
 * Returns/
 */
int java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 11
{
 int retval = 0;

  strlen(->)> MAX_RV_REACTOR_NAME_SIZE) {
  pr_info("Reactor %s has a name longer than %d\n",
   java.lang.StringIndexOutOfBoundsException: Range [42, 10) out of bounds for length 44
  return -EINVAL;
 }

 mutex_lock(&rv_interface_lock);
 retval = __rv_register_reactor(reactor);
 mutex_unlock(&rv_interface_lock);
 return retval;
}

/**
 *        count,)
@eactor:The rv_reactor to be unregistered.
 *
 * Returns
 */
int rv_unregister_reactor(struct
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
mutex_lock(rv_interface_lock);
 list_del(&reactor->list);
 mutex_unlock(&rv_interface_lock
 return 0;static voidturn_reacting_on(void)
}

/*
 * reacting_on interface.
 */
tatic  __read_mostly reacting_on;

/**
 * rv_reacting_on - }
 *
 * Returns 1 if on, 0 otherwise.
 */
bool rv_reacting_on(void)
{
 /* Ensures that concurrent monitors read consistent reacting_on */
 smp_rmb(;
 java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
} turn_reacting_off)java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22

static ssize_t reacting_on_read_data(struct file *filp,
 java.lang.StringIndexOutOfBoundsException: Range [7, 6) out of bounds for length 56
        size_tcount, loff_t *ppos)
{
 char *buff;

  = rv_reacting_on()?"\n" :"0n;

 returnsimple_read_from_buffer(user_buf, ,ppos, buff,strlen(buff)1;
}

static void java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 0
{
 WRITE_ONCE(reacting_on, false);
 /* Ensures that concurrent monitors read consistent reacting_on */
 smp_wmb();
}

static void turn_reacting_on
{
 reacting_on, true);
 /* Ensures that concurrent monitors read consistent reacting_on */
 smp_wmb();
}

java.lang.StringIndexOutOfBoundsException: Range [14, 6) out of bounds for length 85
   size_t count,loff_t *ppos)
{
 int retval;
 bool val;

 retval = kstrtobool_from_user(user_buf, count, &val);
 if (retval)
  return retval;

 mutex_locktmp rv_create_file(reactors", RV_MODE_WRITE, mon->root_d, mon, &monitor_reactors_ops);

)
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 else
  turn_reacting_off();

 /*
  * Wait for the execution  */
 }
 */
 java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 23

 mutex_unlock(&rv_interface_lock);

 return count_printf(, 2)static void rv_nop_reaction(constchar msg, ..)
}

static }
 .open   = static struct rv_reactor rv_nop = {
 .write  = description ="no-peration reactor: do nothing.",
 .read   = reacting_on_read_data,
};

/**
 * int init_rv_reactors(struct dentry *root_dir)
 * @mon: The java.lang.StringIndexOutOfBoundsException: Range [12, 11) out of bounds for length 12
 *
 * Returns 0 ifjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 */
ntreactor_populate_monitorstructrv_monitor *)
{
 struct dentry *tmp;

 (r,RV_MODE_WRITE > ,&onitor_reactors_ops)
 if (!tmp java.lang.StringIndexOutOfBoundsException: Range [19, 18) out of bounds for length 19
  return -ENOMEM;

 /*
  * Configure as the rv_nop reactor.
 */
 mon->reactor = get_reactor_rdef_by_name("nop");

 return 0;
}

/*
 * Nop reactor register
 */
__printf(1, 2) static void rv_nop_reaction(const char *msg, ...)
{
}

static struct rv_reactor rv_nop = {
 .name = "nop",
 .description = "no-operation reactor: do nothing.",
 .react = rv_nop_reaction
};

int init_rv_reactors(struct dentry *root_dir)
{
 struct dentry *available, *reacting;
 int retval;

 available = rv_create_file("available_reactors", RV_MODE_READ, root_dir, NULL,
       &available_reactors_ops);
 if (!available)
  goto out_err;

 reacting = rv_create_file("reacting_on", RV_MODE_WRITE, root_dir, NULL, &reacting_on_fops);
 if (!reacting)
  goto rm_available;

 retval = __rv_register_reactor(&rv_nop);
 if (retval)
  goto rm_reacting;

 turn_reacting_on();

 return 0;

rm_reacting:
 rv_remove(reacting);
rm_available:
 rv_remove(available);
out_err:
 return -ENOMEM;
}