attr_fn_unkn.c

openPBS的开放源代码

/*
*         OpenPBS (Portable Batch System) v2.3 Software License
* 
* 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 "list_link.h"
#include "attribute.h"
#include "resource.h"
#include "pbs_error.h"

static char ident[] = "@(#) $RCSfile: attr_fn_unkn.c,v $ $Revision: 2.1.10.4 $";

/*
 * This file contains functions for manipulating attributes of an
 * unknown (unrecognized) name (and therefore unknown type).
 * It is a collection point for all "other" attributes, other than
 * the types with specific definition and meaning.
 *
 * Because the type is unknown, it cannot be decoded into a native
 * form.  Thus the attribute is maintained in the attrlist form.
 * Any attribute/value located here will be sent to the Scheduler and it
 * within its rules may do as it choses with them.
 *
 * The prototypes are declared in "attribute.h"
 *
 * ----------------------------------------------------------------------------
 * Attribute functions for attributes with value type "unknown"
 * ----------------------------------------------------------------------------
 */

/* External Global Items */


/* private functions */


/*
 * decode_unkn - decode a pair of strings (name and value) into the Unknown
 *	type attribute/resource which is maintained as a "svrattrl", a
 *	linked list of structures containing strings.
 *
 *	Returns: 0 if ok,
 *		>0 error number if error,
 *		*patr members set
 */

int decode_unkn(patr, name, rescn, value)
	struct attribute *patr;		/* May be Modified on Return */
	char *name;
	char *rescn;
	char *value;
{
	svrattrl *entry;
	size_t	     valln;


	if (patr == (attribute *)0)
		return (PBSE_INTERNAL);

	if ( !(patr->at_flags & ATR_VFLAG_SET))
		CLEAR_HEAD(patr->at_val.at_list);

	if (name == (char *)0)
		return (PBSE_INTERNAL);

	if (value == (char *)0)
		valln = 0;
	else
		valln = strlen(value) + 1;

	entry = attrlist_create(name, rescn, valln);
	if (entry == (svrattrl *)0)
		return (PBSE_SYSTEM);

	if (valln)
	    memcpy(entry->al_value, value, valln);
	
	append_link(&patr->at_val.at_list, &entry->al_link, entry);
	patr->at_flags |= ATR_VFLAG_SET | ATR_VFLAG_MODIFY;
	return (0);
}
	

/*
 * encode_unkn - encode attr of unknown type into attrlist form
 *
 * Here things are different from the typical attribute.  Most have a
 * single value to be encoded.  But "the unknown" attribute may have a whole
 * list.
 *
 * This function does not use the parent attribute name, after all "_other_"
 * is rather meaningless.  In addition, each unknown already is in an 
 * attrlist form.
 *
 * Thus for each entry in the list, encode_unkn duplicates the existing
 * attrlist struct and links the copy into the list.
 *
 *	Returns:>=0 if ok, the total encoded size of all resources.
 *		-1 if encoded value would not fit into buffer
 *		-2 if error
 */
/*ARGSUSED*/

int encode_unkn(attr, phead, atname, rsname, mode)
	attribute	*attr;	  /* ptr to attribute to encode */
	list_head	*phead;	  /* list to place entry in */
	char 		*atname;  /* attribute name, not used here */
	char	 	*rsname;  /* resource name, not used here */
	int		 mode;	  /* encode mode, unused here */
{
	svrattrl *plist;
	svrattrl *pnew;

	if ( !attr )
		return (-2);

	plist= (svrattrl *)GET_NEXT(attr->at_val.at_list);
	if (plist == (svrattrl *)0)
		return (0);

	while ( plist != (svrattrl *)0) {
		pnew = (svrattrl *)malloc(plist->al_tsize);
		if (pnew == (svrattrl *)0)
			return (-1);
		CLEAR_LINK(pnew->al_link);
		pnew->al_tsize = plist->al_tsize;
		pnew->al_nameln = plist->al_nameln;
		pnew->al_rescln = plist->al_rescln;
		pnew->al_valln  = plist->al_valln;
		pnew->al_flags   = plist->al_flags;

		pnew->al_name  = (char *)pnew + sizeof (svrattrl);
		(void)memcpy(pnew->al_name, plist->al_name, plist->al_nameln);
		if (plist->al_rescln) {
			pnew->al_resc = pnew->al_name + pnew->al_nameln;
			(void)memcpy(pnew->al_resc, plist->al_resc,
				     plist->al_rescln);
		} else {
			pnew->al_resc = (char *)0;
		}
		if (plist->al_valln) {
			pnew->al_value = pnew->al_name + pnew->al_nameln + 
					 pnew->al_rescln;
			(void)memcpy(pnew->al_value, plist->al_value,
				     pnew->al_valln);
		}
		append_link(phead, &pnew->al_link, pnew);

		plist = (svrattrl *)GET_NEXT(plist->al_link);
	}
	return (1);
}
	


/* 
 * set_unkn - set value of attribute of unknown type  to another
 *
 *	Each entry in the list headed by the "new" attribute is appended
 *	to the list headed by "old".
 *
 *	All operations, set, incr, and decr, map to append.
 *	Returns: 0 if ok
 *		>0 if error
 */

/*ARGSUSED*/
int set_unkn(old, new, op)
	struct attribute *old;
	struct attribute *new;
	enum batch_op op;
{
	svrattrl *plist;
	svrattrl *pnext;
	
	assert(old && new && (new->at_flags & ATR_VFLAG_SET));

	plist = (svrattrl *)GET_NEXT(new->at_val.at_list);
	while ( plist != (svrattrl *)0) {
		pnext = (svrattrl *)GET_NEXT(plist->al_link);
		delete_link(&plist->al_link);
		append_link(&old->at_val.at_list, &plist->al_link, plist);
		plist = pnext;
	}
	old->at_flags |= ATR_VFLAG_SET | ATR_VFLAG_MODIFY;
	return (0);
}

/*
 * comp_unkn - compare two attributes of type ATR_TYPE_RESR
 *
 *	How do you compare something when you don't know what it is...
 *	So, always returns +1
 *
 */

int comp_unkn(attr, with)
	struct attribute *attr;
	struct attribute *with;
{
	return (1);
}
	
/*
 * free_unkn - free space associated with attribute value
 *
 *	For each entry in the list, it is delinked, and freed.
 */

void free_unkn(pattr)
	attribute *pattr;
{
	svrattrl *plist;

	if (pattr->at_flags & ATR_VFLAG_SET) {
		while ((plist = (svrattrl *)GET_NEXT(pattr->at_val.at_list)) !=
								(svrattrl *)0) {
			delete_link(&plist->al_link);
			(void)free(plist);
		}
	}
	CLEAR_HEAD(pattr->at_val.at_list);
	pattr->at_flags &= ~ATR_VFLAG_SET;
}