get_server.c

openPBS的开放源代码

/*
*         OpenPBS (Portable Batch System) v2.3 Software License
* 
* Copyright (c) 1999-2000 Veridian Information Solutions, Inc.
* All rights reserved.
* 
* ---------------------------------------------------------------------------
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* other than those described below, or to purchase support for this software,
* please contact Veridian Systems, PBS Products Department ("Licensor") at:
* 
*    www.OpenPBS.org  [phone]                  [e-mail]
*                        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,
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*    software incorporating the Software.  Further, there can be no
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*/
/*
 * get_server
 *
 * ------------------------------------
 * As specified in section 5 of the ERS:
 *
 *  5.1.2.  Directing Requests to Correct Server
 *
 *  A  command  shall  perform  its  function  by  sending   the
 *  corresponding  request  for  service  to the a batch server.
 *  The choice of batch servers to which to send the request  is
 *  governed by the following ordered set of rules:
 *
 *  1. For those commands which require or accept a job identif-
 *     ier  operand, if the server is specified in the job iden-
 *     tifier operand as @server, then the batch  requests  will
 *     be sent to the server named by server.
 *
 *  2. For those commands which require or accept a job identif-
 *     ier  operand  and  the @server is not specified, then the
 *     command will attempt to determine the current location of
 *     the  job  by  sending  a  Locate Job batch request to the
 *     server which created the job.
 *  
 *  3. If a server component of a destination  is  supplied  via
 *     the  -q  option,  such  as  on  qsub and qselect, but not
 *     qalter, then the server request is sent to that server.
 *  
 *  4. The server request is sent to the  server  identified  as
 *     the default server, see section 2.6.3.
 *     [pbs_connect() implements this]
 *  
 *  2.6.3.  Default Server
 *  
 *  When a server is not specified to a client, the client  will
 *  send  batch requests to the server identified as the default
 *  server.  A client identifies the default server by  (a)  the
 *  setting  of  the environment variable PBS_DEFAULT which con-
 *  tains a destination, or (b) the  destination  in  the  batch
 *  administrator established file {PBS_DIR}/default_destn.
 * ------------------------------------
 *  
 * Takes a job_id_in string as input, calls parse_jobid to separate 
 * the pieces, then applies the above rules in order
 * If things go OK, the function value is set to 0, 
 * if errors, it is set to 1.
 *
 * Full legal syntax is:
 *  seq_number[.parent_server[:port]][@current_server[:port]]  
 *
 */

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

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include "pbs_ifl.h"
#include "net_connect.h"

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

#define notNULL(x) (((x)!=NULL) && (strlen(x)>(size_t)0))

extern int parse_jobid A_((char *jodid, char **seq, char **parent, char **current));

int
get_server(job_id_in, job_id_out, server_out)
char *job_id_in;    /* read only */
char *job_id_out;   /* write only */
char *server_out;   /* write only */
{
    char *seq_number;
    char *parent_server;
    char *current_server;
    char def_server[PBS_MAXSERVERNAME+1];
    char host_server[PBS_MAXSERVERNAME+1];
    char *c;

    /* parse the job_id_in into components */

    if ( parse_jobid(job_id_in, &seq_number, &parent_server, &current_server) )
        return (1);

    /* Apply the above rules, in order, except for the locate job request.
       That request is only sent if the job is not found on the local server.
     */

    if ( notNULL(current_server) ) {		/* @server found */
        strcpy(server_out, current_server);
    } else if ( notNULL(parent_server) ) {	/* .server found */
        strcpy(server_out, parent_server);
    } else {  /* can't locate a server, so return a NULL 
               to tell pbs_connect to use default */
        server_out[0] = '\0';
    }
    
    /* Make a fully quaified name of the job id. */

    strcpy(job_id_out, seq_number);
    strcat(job_id_out, ".");
    if ( notNULL(parent_server) ) {
        if (get_fullhostname(parent_server,host_server,PBS_MAXSERVERNAME) ==0) {
            strcat(job_id_out, host_server);
	    if (c = strchr(parent_server, (int)':')) {
		if (*(c-1) == '\\') c--;
		strcat(job_id_out, c);
	    }
        } else
            return 1;
    } else {
	parent_server = pbs_default();
	if( (parent_server == (char *)NULL) || (*parent_server == '\0') ) {
            return 1;
	} else {
	    strncpy(def_server, parent_server, PBS_MAXSERVERNAME);
	}
        c = def_server;
        while ( *c != '\n' && *c != '\0' ) c++;
        *c = '\0';
        if (get_fullhostname(def_server, host_server, PBS_MAXSERVERNAME) == 0) {
            strcat(job_id_out, host_server);
	    if (c = strchr(def_server, (int)':')) {
		if (*(c-1) == '\\') c--;
		strcat(job_id_out, c);
	    }
        } else
            return 1;
    }
    return 0;
}