/*
   Bacula® - The Network Backup Solution

   Copyright (C) 2004-2007 Free Software Foundation Europe e.V.

   The main author of Bacula is Kern Sibbald, with contributions from
   many others, a complete list can be found in the file AUTHORS.
   This program is Free Software; you can redistribute it and/or
   modify it under the terms of version two of the GNU General Public
   License as published by the Free Software Foundation and included
   in the file LICENSE.

   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., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

   Bacula® is a registered trademark of John Walker.
   The licensor of Bacula is the Free Software Foundation Europe
   (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
   Switzerland, email:ftf@fsfeurope.org.
*/
/*
 * Process and thread timer routines, built on top of watchdogs.
 *
 *    Nic Bellamy <nic@bellamy.co.nz>, October 2004.
 *
*/

#include "bacula.h"
#include "jcr.h"

/* Forward referenced functions */
static void stop_btimer(btimer_t *wid);
static btimer_t *btimer_start_common(uint32_t wait);

/* Forward referenced callback functions */
static void callback_child_timer(watchdog_t *self);
static void callback_thread_timer(watchdog_t *self);
#ifdef xxx
static void destructor_thread_timer(watchdog_t *self);
static void destructor_child_timer(watchdog_t *self);
#endif

/*
 * Start a timer on a child process of pid, kill it after wait seconds.
 *
 *  Returns: btimer_t *(pointer to btimer_t struct) on success
 *           NULL on failure
 */
btimer_t *start_child_timer(pid_t pid, uint32_t wait)
{
   btimer_t *wid;

   wid = btimer_start_common(wait);
   if (wid == NULL) {
      return NULL;
   }
   wid->type = TYPE_CHILD;
   wid->pid = pid;
   wid->killed = false;

   wid->wd->callback = callback_child_timer;
   wid->wd->one_shot = false;
   wid->wd->interval = wait;
   register_watchdog(wid->wd);

   Dmsg3(900, "Start child timer %p, pid %d for %d secs.\n", wid, pid, wait);
   return wid;
}

/*
 * Stop child timer
 */
void stop_child_timer(btimer_t *wid)
{
   if (wid == NULL) {
      Dmsg0(900, "stop_child_timer called with NULL btimer_id\n");
      return;
   }
   Dmsg2(900, "Stop child timer %p pid %d\n", wid, wid->pid);
   stop_btimer(wid);
}

#ifdef xxx
static void destructor_child_timer(watchdog_t *self)
{
   btimer_t *wid = (btimer_t *)self->data;
   free(wid->wd);
   free(wid);
}
#endif

static void callback_child_timer(watchdog_t *self)
{
   btimer_t *wid = (btimer_t *)self->data;

   if (!wid->killed) {
      /* First kill attempt; try killing it softly (kill -SONG) first */
      wid->killed = true;

      Dmsg2(050, "watchdog %p term PID %d\n", self, wid->pid);

      /* Kill -TERM the specified PID, and reschedule a -KILL for 5 seconds
       * later. (Warning: this should let dvd-writepart enough time to term
       * and kill growisofs, which takes 3 seconds, so the interval must not
       * be less than 5 seconds)
       */
      kill(wid->pid, SIGTERM);
      self->interval = 5;
   } else {
      /* This is the second call - terminate with prejudice. */
      Dmsg2(050, "watchdog %p kill PID %d\n", self, wid->pid);

      kill(wid->pid, SIGKILL);

      /* Setting one_shot to true before we leave ensures we don't get
       * rescheduled.
       */
      self->one_shot = true;
   }
}

/*
 * Start a timer on a thread. kill it after wait seconds.
 *
 *  Returns: btimer_t *(pointer to btimer_t struct) on success
 *           NULL on failure
 */
btimer_t *start_thread_timer(pthread_t tid, uint32_t wait)
{
   btimer_t *wid;
   wid = btimer_start_common(wait);
   if (wid == NULL) {
      Dmsg1(900, "start_thread_timer return NULL from common. wait=%d.\n", wait);
      return NULL;
   }
   wid->type = TYPE_PTHREAD;
   wid->tid = tid;

   wid->wd->callback = callback_thread_timer;
   wid->wd->one_shot = true;
   wid->wd->interval = wait;
   register_watchdog(wid->wd);

   Dmsg3(900, "Start thread timer %p tid %p for %d secs.\n", wid, tid, wait);

   return wid;
}

/*
 * Start a timer on a BSOCK. kill it after wait seconds.
 *
 *  Returns: btimer_t *(pointer to btimer_t struct) on success
 *           NULL on failure
 */
btimer_t *start_bsock_timer(BSOCK *bsock, uint32_t wait)
{
   btimer_t *wid;
   wid = btimer_start_common(wait);
   if (wid == NULL) {
      return NULL;
   }
   wid->type = TYPE_BSOCK;
   wid->tid = pthread_self();
   wid->bsock = bsock;

   wid->wd->callback = callback_thread_timer;
   wid->wd->one_shot = true;
   wid->wd->interval = wait;
   register_watchdog(wid->wd);

   Dmsg4(950, "Start bsock timer %p tid=%p for %d secs at %d\n", wid,
         wid->tid, wait, time(NULL));

   return wid;
}

/*
 * Stop bsock timer
 */
void stop_bsock_timer(btimer_t *wid)
{
   if (wid == NULL) {
      Dmsg0(900, "stop_bsock_timer called with NULL btimer_id\n");
      return;
   }
   Dmsg3(950, "Stop bsock timer %p tid=%p at %d.\n", wid, wid->tid, time(NULL));
   stop_btimer(wid);
}


/*
 * Stop thread timer
 */
void stop_thread_timer(btimer_t *wid)
{
   if (wid == NULL) {
      Dmsg0(900, "stop_thread_timer called with NULL btimer_id\n");
      return;
   }
   Dmsg2(900, "Stop thread timer %p tid=%p.\n", wid, wid->tid);
   stop_btimer(wid);
}

#ifdef xxx
static void destructor_thread_timer(watchdog_t *self)
{
   btimer_t *wid = (btimer_t *)self->data;
   free(wid->wd);
   free(wid);
}
#endif

static void callback_thread_timer(watchdog_t *self)
{
   btimer_t *wid = (btimer_t *)self->data;

   Dmsg4(50, "thread timer %p kill %s tid=%p at %d.\n", self,
      wid->type == TYPE_BSOCK ? "bsock" : "thread", wid->tid, time(NULL));

   if (wid->type == TYPE_BSOCK && wid->bsock) {
      wid->bsock->set_timed_out();
   }
   pthread_kill(wid->tid, TIMEOUT_SIGNAL);
}

static btimer_t *btimer_start_common(uint32_t wait)
{
   btimer_t *wid = (btimer_t *)malloc(sizeof(btimer_t));

   wid->wd = new_watchdog();
   if (wid->wd == NULL) {
      free(wid);
      return NULL;
   }
   wid->wd->data = wid;
   wid->killed = FALSE;

   return wid;
}

/*
 * Stop btimer
 */
static void stop_btimer(btimer_t *wid)
{
   if (wid == NULL) {
      Emsg0(M_ABORT, 0, _("stop_btimer called with NULL btimer_id\n"));
   }
   unregister_watchdog(wid->wd);
   free(wid->wd);
   free(wid);
}