setup_env.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.
* 
* ---------------------------------------------------------------------------
* 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  [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,
*    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.
*/
#include <pbs_config.h>   /* the master config generated by configure */

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "portability.h"
#include "log.h"

static char ident[] = "@(#) $RCSfile: setup_env.c,v $ $Revision: 2.2.6.4 $";

/*
 * setup_env - setup the daemon's environment
 *
 *	To provide a "safe and secure" environment, the daemons replace their
 *	inherited one with one from a file.  Each line in the file is
 *	either a comment line, starting with '#' or ' ', or is a line of 
 *	the forms:	variable=value
 *			variable
 *	In the second case the value is obtained from the current environment.
 *
 *	Returns: number of variables placed or -1 on error
 */

#define PBS_ENVP_STR     64
#define PBS_ENV_CHUNCK 1024

int setup_env(filen)
	char *filen;
{
	char	     buf[256];
	int	     evbufsize = 0;
	FILE	    *efile;
	char        *envbuf;
	static char *envp[PBS_ENVP_STR+1];
	int	     len;
	int	     nstr = 0;
	char	    *pequal;
	char	    *pval;
	extern char **environ;

	envp[0] = (char *)0;
	if ((filen == (char *)0) || (*filen == '\0')) {
		environ = envp;
		return 0;
	}

	efile = fopen(filen, "r");
	if (efile != (FILE *)0) {

	    while (fgets(buf, 255, efile) ) {
		if ((buf[0] != '#') && (buf[0] != ' ') && (buf[0] != '\n')) {
			len = strlen(buf);
			buf[len-1] = '\0';
			if ((pequal = strchr(buf, (int)'=')) == 0) {
				if ((pval = getenv(buf)) == 0)
					continue;
				len += strlen(pval) + 1;
			}
	
			if (evbufsize < len) {
				if ((envbuf = malloc(PBS_ENV_CHUNCK)) == 0)
					goto err;

				evbufsize = PBS_ENV_CHUNCK;
			}
			(void)strcpy(envbuf, buf);
			if (pequal == 0) {
				(void)strcat(envbuf, "=");
				(void)strcat(envbuf, pval);
			}
			envp[nstr++] = envbuf;
			if (nstr == PBS_ENVP_STR)
				goto err;
			envp[nstr] = (char *)0;
			envbuf += len;
			evbufsize -= len;
		}
	    }
	    fclose(efile);
	    environ = envp;
	} else if (errno != ENOENT) {
		goto err;
	}
	return (nstr);

err:	log_err(-1, "setup_env", "Could not set up the environment");
	return (-1);
}