/*
*         OpenPBS (Portable Batch System) v2.3 Software License
*
* Copyright (c) 1999-2000 Veridian Information Solutions, Inc.
* All rights reserved.
*
* ---------------------------------------------------------------------------
* For a license to use or redistribute the OpenPBS software under conditions
* other than those described below, or to purchase support for this software,
* please contact Veridian Systems, PBS Products Department ("Licensor") at:
*
*    www.OpenPBS.org  +1 650 967-4675                  sales@OpenPBS.org
*                        877 902-4PBS (US toll-free)
* ---------------------------------------------------------------------------
*
* This license covers use of the OpenPBS v2.3 software (the "Software") at
* your site or location, and, for certain users, redistribution of the
* Software to other sites and locations.  Use and redistribution of
* OpenPBS v2.3 in source and binary forms, with or without modification,
* are permitted provided that all of the following conditions are met.
* After December 31, 2001, only conditions 3-6 must be met:
*
* 1. Commercial and/or non-commercial use of the Software is permitted
*    provided a current software registration is on file at www.OpenPBS.org.
*    If use of this software contributes to a publication, product, or
*    service, proper attribution must be given; see www.OpenPBS.org/credit.html
*
* 2. Redistribution in any form is only permitted for non-commercial,
*    non-profit purposes.  There can be no charge for the Software or any
*    software incorporating the Software.  Further, there can be no
*    expectation of revenue generated as a consequence of redistributing
*    the Software.
*
* 3. Any Redistribution of source code must retain the above copyright notice
*    and the acknowledgment contained in paragraph 6, this list of conditions
*    and the disclaimer contained in paragraph 7.
*
* 4. Any Redistribution in binary form must reproduce the above copyright
*    notice and the acknowledgment contained in paragraph 6, this list of
*    conditions and the disclaimer contained in paragraph 7 in the
*    documentation and/or other materials provided with the distribution.
*
* 5. Redistributions in any form must be accompanied by information on how to
*    obtain complete source code for the OpenPBS software and any
*    modifications and/or additions to the OpenPBS software.  The source code
*    must either be included in the distribution or be available for no more
*    than the cost of distribution plus a nominal fee, and all modifications
*    and additions to the Software must be freely redistributable by any party
*    (including Licensor) without restriction.
*
* 6. All advertising materials mentioning features or use of the Software must
*    display the following acknowledgment:
*
*     "This product includes software developed by NASA Ames Research Center,
*     Lawrence Livermore National Laboratory, and Veridian Information
*     Solutions, Inc.
*     Visit www.OpenPBS.org for OpenPBS software support,
*     products, and information."
*
* 7. DISCLAIMER OF WARRANTY
*
* THIS SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. ANY EXPRESS
* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT
* ARE EXPRESSLY DISCLAIMED.
*
* IN NO EVENT SHALL VERIDIAN CORPORATION, ITS AFFILIATED COMPANIES, OR THE
* U.S. GOVERNMENT OR ANY OF ITS AGENCIES BE LIABLE FOR ANY DIRECT OR INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
* OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* This license will be governed by the laws of the Commonwealth of Virginia,
* without reference to its choice of law rules.
*/
/*
 * req_signaljob.c - functions dealing with sending a signal
 *       to a running job.
 */

#include <pbs_config.h>   /* the master config generated by configure */

#include <stdio.h>
#include "libpbs.h"
#include <errno.h>
#include <signal.h>
#include <pthread.h>
#include "server_limits.h"
#include "list_link.h"
#include "attribute.h"
#include "server.h"
#include "credential.h"
#include "batch_request.h"
#include "pbs_job.h"
#include "work_task.h"
#include "pbs_error.h"
#include "log.h"
#include "../lib/Liblog/pbs_log.h"
#include "../lib/Liblog/log_event.h"
#include "svrfunc.h"
#include "ji_mutex.h"
#include "mutex_mgr.hpp"
#include "../lib/Libnet/lib_net.h"

/* Private Function local to this file */

static void post_signal_req (batch_request *preq);

/* Global Data Items: */

extern int   LOGLEVEL;

extern void   set_old_nodes (job *);

extern job  *chk_job_request(char *, struct batch_request *);

/*
 * req_signaljob - service the Signal Job Request
 *
 * This request sends (via MOM) a signal to a running job.
 * MOM procceses in req_signaljob()
 * MOM replies with either ack or reject
 * Server gets response from MOM which invokes post_signal_req()
 * Which then replies to the requester with either a reject or ack
 */

int req_signaljob(

  batch_request *preq) /* I */

  {
  job           *pjob;
  int            rc;
  char           log_buf[LOCAL_LOG_BUF_SIZE];
  batch_request *dup_req = NULL;

  /* preq free'd in error cases */
  if ((pjob = chk_job_request(preq->rq_ind.rq_signal.rq_jid, preq)) == 0)
    {
    return(PBSE_NONE);
    }

  mutex_mgr job_mutex(pjob->ji_mutex, true);

  /* the job must be running */

  if (pjob->ji_qs.ji_state != JOB_STATE_RUNNING)
    {
    req_reject(PBSE_BADSTATE, 0, preq, NULL, NULL);

    return(PBSE_NONE);
    }

  /* Special pseudo signals for suspend and resume require op/mgr */

  if (!strcmp(preq->rq_ind.rq_signal.rq_signame, SIG_RESUME) ||
      !strcmp(preq->rq_ind.rq_signal.rq_signame, SIG_SUSPEND))
    {
    if ((preq->rq_perm & (ATR_DFLAG_OPRD | ATR_DFLAG_OPWR | ATR_DFLAG_MGRD | ATR_DFLAG_MGWR)) == 0)
      {
      /* for suspend/resume, must be mgr/op */
      req_reject(PBSE_PERM, 0, preq, NULL, NULL);
      
      return(PBSE_NONE);
      }
  
    }

  /* save job ptr for post_signal_req() */
  preq->rq_extra = strdup(pjob->ji_qs.ji_jobid);

  /* FIXME: need a race-free check for available free subnodes before
   * resuming a suspended job */

#ifdef DONOTSUSPINTJOB
  /* interactive jobs don't resume correctly so don't allow a suspend */

  if (!strcmp(preq->rq_ind.rq_signal.rq_signame, SIG_SUSPEND) &&
      (pjob->ji_wattr[JOB_ATR_interactive].at_flags & ATR_VFLAG_SET) &&
      (pjob->ji_wattr[JOB_ATR_interactive].at_val.at_long > 0))
    {
    req_reject(PBSE_JOBTYPE, 0, preq, NULL, NULL);

    return(PBSE_NONE);
    }

#endif

  if (LOGLEVEL >= 6)
    {
    char ipstr[128];

    sprintf(log_buf, "relaying signal request to mom %s", netaddr_long(pjob->ji_qs.ji_un.ji_exect.ji_momaddr,ipstr));

    log_record(PBSEVENT_SCHED,PBS_EVENTCLASS_REQUEST,"req_signaljob",log_buf);
    }

  /* send reply for asynchronous suspend */
  if (preq->rq_type == PBS_BATCH_AsySignalJob)
    {
    /* reply_ack will free preq. We need to copy it before we call reply_ack */
    batch_request *new_preq;

    new_preq = duplicate_request(preq, -1);
    if (new_preq == NULL)
      {
      sprintf(log_buf, "failed to duplicate batch request");
      log_event(PBSEVENT_JOB, PBS_EVENTCLASS_JOB, __func__, log_buf);
      return(PBSE_MEM_MALLOC);
      }

    get_batch_request_id(new_preq);

    reply_ack(new_preq);
    preq->rq_noreply = TRUE;
    }

  /* pass the request on to MOM */
  if ((dup_req = duplicate_request(preq)) == NULL)
    {
    req_reject(PBSE_SYSTEM, 0, preq, NULL, "can not allocate memory");
    }
  /* The dup_req is freed in relay_to_mom (failure)
   * or in issue_Drequest (success) */
  else 
    {
    rc = relay_to_mom(&pjob, dup_req, NULL);

    if (pjob != NULL)
      job_mutex.unlock();
    else
      job_mutex.set_unlock_on_exit(false);

    if (rc != PBSE_NONE)
      {
      free_br(dup_req);
      req_reject(rc, 0, preq, NULL, NULL);  /* unable to get to MOM */
      }
    else
      {
      post_signal_req(dup_req);
      free_br(preq);
      }
    }

  /* If successful we ack after mom replies to us, we pick up in post_signal_req() */

  return(PBSE_NONE);
  }  /* END req_signaljob() */

/*
 * issue_signal - send an internally generated signal to a running job
 */

int issue_signal(

  job        **pjob_ptr,
  const char  *signame, /* name of the signal to send */
  void       (*func)(struct batch_request *),
  void        *extra, /* extra parameter to be stored in sig request */
  char        *extend) /* Parameter to put in extended part of request */

  {
  int                   rc;
  job                  *pjob = *pjob_ptr;
  struct batch_request *newreq;
  char                  jobid[PBS_MAXSVRJOBID + 1];

  /* build up a Signal Job batch request */

  if ((newreq = alloc_br(PBS_BATCH_SignalJob)) == NULL)
    {
    /* FAILURE */

    return(PBSE_SYSTEM);
    }

  newreq->rq_extra = extra;
  newreq->rq_extend = extend;
  if (extend != NULL)
    {
    newreq->rq_extsz = strlen(extend);
    }

  strcpy(newreq->rq_ind.rq_signal.rq_jid, pjob->ji_qs.ji_jobid);

  snprintf(newreq->rq_ind.rq_signal.rq_signame, sizeof(newreq->rq_ind.rq_signal.rq_signame), "%s", signame);

  /* The newreq is freed in relay_to_mom (failure)
   * or in issue_Drequest (success) */
  rc = relay_to_mom(&pjob, newreq, NULL);

  if ((rc == PBSE_NONE) &&
      (pjob != NULL))
    {
    strcpy(jobid, pjob->ji_qs.ji_jobid);
    unlock_ji_mutex(pjob, __func__, NULL, LOGLEVEL);
    func(newreq);

    *pjob_ptr = svr_find_job((char *)jobid, TRUE);
    }
  else
    {
    free_br(newreq);

    if (pjob == NULL)
      *pjob_ptr = NULL;
    }

  return(rc);
  }  /* END issue_signal() */



/*
 * post_signal_req - complete a Signal Job Request (externally generated)
 */

void post_signal_req(

  batch_request *preq)

  {
  char                 *jobid;
  job                  *pjob;

  char                  log_buf[LOCAL_LOG_BUF_SIZE];

  /* request has been handled elsewhere */
  if (preq == NULL)
    return;

  preq->rq_conn = preq->rq_orgconn;  /* restore client socket */

  if (preq->rq_reply.brp_code)
    {
    log_event(
      PBSEVENT_DEBUG,
      PBS_EVENTCLASS_REQUEST,
      preq->rq_ind.rq_signal.rq_jid,
      pbse_to_txt(PBSE_MOMREJECT));

    errno = 0;

    req_reject(preq->rq_reply.brp_code, 0, preq, NULL, NULL);
    }
  else
    {
    if ((jobid = (char *)preq->rq_extra) == NULL)
      {
      log_err(ENOMEM, __func__, "Cannot allocate memory! FAILURE");
      return;
      }

    if ((pjob = svr_find_job(jobid, FALSE)) != NULL)
      {
      mutex_mgr job_mutex(pjob->ji_mutex, true);

      if (strcmp(preq->rq_ind.rq_signal.rq_signame, SIG_SUSPEND) == 0)
        {
        if ((pjob->ji_qs.ji_svrflags & JOB_SVFLG_Suspend) == 0)
          {
          pjob->ji_qs.ji_svrflags |= JOB_SVFLG_Suspend;
          
          set_statechar(pjob);
          
          job_save(pjob, SAVEJOB_QUICK, 0);
          
          /* release resources allocated to suspended job - NORWAY */
          
          free_nodes(pjob);
          }
        }
      else if (strcmp(preq->rq_ind.rq_signal.rq_signame, SIG_RESUME) == 0)
        {
        if (pjob->ji_qs.ji_svrflags & JOB_SVFLG_Suspend)
          {
          /* re-allocate assigned node to resumed job - NORWAY */
          
          set_old_nodes(pjob);
          
          pjob->ji_qs.ji_svrflags &= ~JOB_SVFLG_Suspend;
          
          set_statechar(pjob);
          
          job_save(pjob, SAVEJOB_QUICK, 0);
          }
        }
      }
    else
      {
      /* job is gone */
      snprintf(log_buf,sizeof(log_buf),
        "Cannot find job '%s', assuming success",
        jobid);
      log_event(PBSEVENT_SYSTEM, PBS_EVENTCLASS_JOB, __func__, log_buf);
      }

    free(jobid);

    reply_ack(preq);
    }

  return;
  }  /* END post_signal_req() */

/* END req_signal.c */

