attr_fn_resc.c

openPBS的开放源代码

/*
*         OpenPBS (Portable Batch System) v2.3 Software License
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* Copyright (c) 1999-2000 Veridian Information Solutions, Inc.
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#include <pbs_config.h>   /* the master config generated by configure */

#include <assert.h>
#include <ctype.h>
#include <memory.h>
#ifndef NDEBUG
#include <stdio.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <pbs_ifl.h>
#include "log.h"
#include "list_link.h"
#include "attribute.h"
#include "resource.h"
#include "pbs_error.h"

static char ident[] = "@(#) $RCSfile: attr_fn_resc.c,v $ $Revision: 2.1.10.5 $";

/*
 * This file contains functions for manipulating attributes of type
 *	resource
 *
 * A "resource" is similiar to an attribute but with two levels of
 * names.  The first name is the attribute name, e.g. "resource-list",
 * the second name is the resource name, e.g. "mem".
 *
 * Each resource_def has functions for:
 *	Decoding the value string to the internal representation.
 *	Encoding the internal attribute to external form
 *	Setting the value by =, + or - operators.
 *	Comparing a (decoded) value with the attribute value.
 *	freeing the resource value space (if extra memory is allocated)
 *
 * Some or all of the functions for an resource type may be shared with
 * other resource types or even attributes.
 * 
 * The prototypes are declared in "attribute.h", also see resource.h
 *
 * ----------------------------------------------------------------------------
 * Attribute functions for attributes with value type resource
 * ----------------------------------------------------------------------------
 */

/* Global Variables */

int resc_access_perm;

/* External Global Items */

int comp_resc_gt;	/* count of resources compared > */
int comp_resc_eq;	/* count of resources compared = */
int comp_resc_lt;	/* count of resources compared < */
int comp_resc_nc;	/* count of resources not compared  */

extern resource_def svr_resc_def[];
extern int	    svr_resc_size;


/*
 * decode_resc - decode a "attribute name/resource name/value" triplet into
 *	         a resource type attribute
 *
 *	Returns: 0 if ok,
 *		>0 error number if error,
 *		*patr members set
 */

int decode_resc(patr, name, rescn, val)
	struct attribute *patr;		/* Modified on Return */
	char *name;			/* attribute name */
	char *rescn;			/* resource name - is used here */
	char *val;			/* resource value */
{
	resource	*prsc;
	resource_def	*prdef;
	int		 rc = 0;
	int		 rv;

	if (patr == (attribute *)0)
		return (PBSE_INTERNAL);
	if (rescn == (char *)0)
		return (PBSE_UNKRESC);
	if ( !(patr->at_flags & ATR_VFLAG_SET))
		CLEAR_HEAD(patr->at_val.at_list);
	

	prdef = find_resc_def(svr_resc_def, rescn, svr_resc_size);
	if (prdef == (resource_def *)0) {
		/*
		 * didn't find resource with matching name, use unknown;
		 * but return PBSE_UNKRESC incase caller dosn`t wish to
		 * accept unknown resources
 		 */
		rc = PBSE_UNKRESC;
		prdef = svr_resc_def + (svr_resc_size-1);
	}

	prsc = find_resc_entry(patr, prdef);
	if (prsc == (resource *)0) 	/* no current resource entry, add it */
		if ((prsc = add_resource_entry(patr,prdef)) == (resource *)0) {
			return (PBSE_SYSTEM);
		}

	/* note special use of ATR_DFLAG_ACCESS, see server/attr_recov() */

	if (((prsc->rs_defin->rs_flags&resc_access_perm&ATR_DFLAG_WRACC) ==0) &&
	    (resc_access_perm != ATR_DFLAG_ACCESS))
		return (PBSE_ATTRRO);

	patr->at_flags |= ATR_VFLAG_SET | ATR_VFLAG_MODIFY;
	rv = prdef->rs_decode(&prsc->rs_value, name, rescn, val);
	if (rv)
		return (rv);
	else
		return (rc);
}

/*
 * encode_resc - encode attr of type ATR_TYPE_RESR into attr_extern form
 *
 * Here we are a little different from the typical attribute.  Most have a
 * single value to be encoded.  But resource attribute may have a whole bunch.
 * First get the name of the parent attribute (typically "resource-list").
 * Then for each resource in the list, call the individual resource decode
 * routine with "aname" set to the parent attribute name.
 *
 * If mode is either ATR_ENCODE_SAVE or ATR_ENCODE_SVR, then any resource 
 * currently set to the default value is not encoded.   This allows it to be
 * reset if the default changes or it is moved.
 *
 * If the mode is ATR_ENCODE_CLIENT or ATR_ENCODE_MOM, the client permission
 * passed in the global variable resc_access_perm is checked against each
 * definition.  This allows a resource by resource access setting, not just
 * on the attribute.
 *
 *	Returns: >0 if ok
 *		 =0 if no value to encode, no entries added to list
 *		 <0 if some resource entry had an encode error.
 */

int encode_resc(attr, phead, atname, rsname, mode)
	attribute	*attr;	  /* ptr to attribute to encode */
	list_head	*phead;	  /* head of attrlist list */
	char		*atname;   /* attribute name */
	char		*rsname;   /* resource name, null on call */
	int		 mode;	  /* encode mode */
{
	int	    dflt;
	resource   *prsc;
	int	    rc;
	int	    grandtotal = 0;
	int	    perm;

	if ( !attr )
		return (-1);
	if ( !(attr->at_flags & ATR_VFLAG_SET))
		return (0);	/* no resources at all */

	/* ok now do each separate resource */

	prsc = (resource *)GET_NEXT(attr->at_val.at_list);
	while (prsc != (resource *)0) {

	    /*
	     * encode if sending to client or MOM with permission
	     * encode if saving and not default value
	     * encode if sending to server and not default and have permission
	     */

	    perm = prsc->rs_defin->rs_flags & resc_access_perm ;
	    dflt = prsc->rs_value.at_flags & ATR_VFLAG_DEFLT;
	    if ( ((mode == ATR_ENCODE_CLIENT) && perm)  ||
		 ((mode == ATR_ENCODE_MOM) && perm)     ||
		 ((mode == ATR_ENCODE_SAVE) && (dflt == 0))  ||
		 ((mode == ATR_ENCODE_SVR)  && (dflt == 0) && perm) ) {
		
		    rsname = prsc->rs_defin->rs_name;
		    rc = prsc->rs_defin->rs_encode(&prsc->rs_value, phead,
						   atname, rsname, mode);
		    if (rc < 0)
			return (rc);
		    grandtotal += rc;
	    }
	    prsc = (resource *)GET_NEXT(prsc->rs_link);
	}
	return (grandtotal);
}