/*****************************************************************************\
 *  switch_none.c - Library for managing a switch with no
 *****************************************************************************
 *  Copyright (C) 2002 The Regents of the University of California.
 *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
 *  Written by Morris Jette <jette1@llnl.gov>
 *  UCRL-CODE-2002-040.
 *  
 *  This file is part of SLURM, a resource management program.
 *  For details, see <http://www.llnl.gov/linux/slurm/>.
 *  
 *  SLURM is free software; you can redistribute it and/or modify it under
 *  the terms of the GNU General Public License as published by the Free
 *  Software Foundation; either version 2 of the License, or (at your option)
 *  any later version.
 *  
 *  SLURM 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 SLURM; if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
\*****************************************************************************/

#if     HAVE_CONFIG_H
#  include "config.h"
#endif

#include <signal.h>
#include <sys/types.h>

#include <slurm/slurm_errno.h>
#include "src/common/slurm_xlator.h"

/*
 * These variables are required by the generic plugin interface.  If they
 * are not found in the plugin, the plugin loader will ignore it.
 *
 * plugin_name - a string giving a human-readable description of the
 * plugin.  There is no maximum length, but the symbol must refer to
 * a valid string.
 *
 * plugin_type - a string suggesting the type of the plugin or its
 * applicability to a particular form of data or method of data handling.
 * If the low-level plugin API is used, the contents of this string are
 * unimportant and may be anything.  SLURM uses the higher-level plugin
 * interface which requires this string to be of the form
 *
 *      <application>/<method>
 *
 * where <application> is a description of the intended application of
 * the plugin (e.g., "switch" for SLURM switch) and <method> is a description 
 * of how this plugin satisfies that application.  SLURM will only load
 * a switch plugin if the plugin_type string has a prefix of "switch/".
 *
 * plugin_version - an unsigned 32-bit integer giving the version number
 * of the plugin.  If major and minor revisions are desired, the major
 * version number may be multiplied by a suitable magnitude constant such
 * as 100 or 1000.  Various SLURM versions will likely require a certain
 * minimum versions for their plugins as this API matures.
 */
const char plugin_name[]        = "switch NONE plugin";
const char plugin_type[]        = "switch/none";
const uint32_t plugin_version   = 100;

/*
 * init() is called when the plugin is loaded, before any other functions
 * are called.  Put global initialization here.
 */
int init ( void )
{
	verbose("%s loaded", plugin_name);
	return SLURM_SUCCESS;
}

int fini ( void )
{
	return SLURM_SUCCESS;
}

/*
 * switch functions for global state save/restore
 */
int switch_p_libstate_save ( char * dir_name )
{
	return SLURM_SUCCESS;
}

int switch_p_libstate_restore ( char * dir_name )
{
	return SLURM_SUCCESS;
}

/*
 * switch functions for job step specific credential
 */
int switch_p_alloc_jobinfo ( switch_jobinfo_t *switch_job )
{
	return SLURM_SUCCESS;
}

int switch_p_build_jobinfo ( switch_jobinfo_t switch_job, char *nodelist, 
		int nprocs, int cyclic_alloc)
{
	return SLURM_SUCCESS;
}

switch_jobinfo_t switch_p_copy_jobinfo  ( switch_jobinfo_t switch_job )
{
	return NULL;
}

void switch_p_free_jobinfo ( switch_jobinfo_t switch_job )
{
	return;
}

int switch_p_pack_jobinfo ( switch_jobinfo_t switch_job, Buf buffer )
{
	return 0;
}

int switch_p_unpack_jobinfo ( switch_jobinfo_t switch_job, Buf buffer )
{
	return SLURM_SUCCESS;
}

void switch_p_print_jobinfo(FILE *fp, switch_jobinfo_t jobinfo)
{
	return;
}

char *switch_p_sprint_jobinfo(switch_jobinfo_t switch_jobinfo, char *buf,
		size_t size)
{
	if ((buf != NULL) && size) {
		buf[0] = '\0';
		return buf;
	}

	return NULL;
}

/*
 * switch functions for job initiation
 */
int switch_p_node_init ( void )
{
	return SLURM_SUCCESS;
}

int switch_p_node_fini ( void )
{
	return SLURM_SUCCESS;
}

int switch_p_job_preinit ( switch_jobinfo_t jobinfo )
{
	return SLURM_SUCCESS;
}

int switch_p_job_init ( switch_jobinfo_t jobinfo, uid_t uid )
{
	return SLURM_SUCCESS;
}

int switch_p_job_fini ( switch_jobinfo_t jobinfo )
{
	return SLURM_SUCCESS;
}

int switch_p_job_postfini ( switch_jobinfo_t jobinfo, uid_t pgid, 
				uint32_t job_id, uint32_t step_id )
{
	/*
	 *  Kill all processes in the job's session
	 */
	if (pgid) {
		debug2("Sending SIGKILL to pgid %lu", 
			(unsigned long) pgid); 
		kill(-pgid, SIGKILL);
	} else
		debug("Job %u.%u: Bad pid valud %lu", job_id, 
		      step_id, (unsigned long) pgid);

	return SLURM_SUCCESS;
}

int switch_p_job_attach ( switch_jobinfo_t jobinfo, char ***env, 
			uint32_t nodeid, uint32_t procid, uint32_t nnodes, 
			uint32_t nprocs, uint32_t rank )
{
	return SLURM_SUCCESS;
}

extern int switch_p_get_jobinfo(switch_jobinfo_t switch_job,
	int key, void *resulting_data)
{
	slurm_seterrno(EINVAL);
	return SLURM_ERROR;
}

/*
 * switch functions for other purposes
 */
bool switch_p_no_frag ( void )
{
	return false;
}

extern int switch_p_get_errno(void)
{
	return SLURM_SUCCESS;
}

extern char *switch_p_strerror(int errnum)
{
	return NULL;
}

/*
 * node switch state monitoring functions
 * required for IBM Federation switch 
 */
extern int switch_p_clear_node_state(void)
{
	return SLURM_SUCCESS;
}

extern int switch_p_alloc_node_info(switch_node_info_t *switch_node)
{
	return SLURM_SUCCESS;
}

extern int switch_p_build_node_info(switch_node_info_t switch_node)
{
	return SLURM_SUCCESS;
}

extern int switch_p_pack_node_info(switch_node_info_t switch_node, 
	Buf buffer)
{
	return 0;
}

extern int switch_p_unpack_node_info(switch_node_info_t switch_node,
	Buf buffer)
{
	return SLURM_SUCCESS;
}

extern int switch_p_free_node_info(switch_node_info_t *switch_node)
{
	return SLURM_SUCCESS;
}

extern char*switch_p_sprintf_node_info(switch_node_info_t switch_node,
	char *buf, size_t size)
{
	if ((buf != NULL) && size) {
		buf[0] = '\0';
		return buf;
	}

	return NULL;
}

extern int switch_p_job_step_complete(switch_jobinfo_t jobinfo,
	char *nodelist)
{
	return SLURM_SUCCESS;
}

