osprey/libf/pxf/pxfchroot.c

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/*

  Copyright (C) 2000, 2001 Silicon Graphics, Inc.  All Rights Reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2.1 of the GNU Lesser General Public License 
  as published by the Free Software Foundation.

  This program is distributed in the hope that it would be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

  Further, this software is distributed without any warranty that it is
  free of the rightful claim of any third person regarding infringement 
  or the like.  Any license provided herein, whether implied or 
  otherwise, applies only to this software file.  Patent licenses, if
  any, provided herein do not apply to combinations of this program with 
  other software, or any other product whatsoever.  

  You should have received a copy of the GNU Lesser General Public 
  License along with this program; if not, write the Free Software 
  Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, 
  USA.

  Contact information:  Silicon Graphics, Inc., 1600 Amphitheatre Pky,
  Mountain View, CA 94043, or:

  http://www.sgi.com

  For further information regarding this notice, see:

  http://oss.sgi.com/projects/GenInfo/NoticeExplan

*/


#pragma ident "@(#) libf/pxf/pxfchroot.c  92.1  06/29/99 11:36:06"
#include <errno.h>
#include <fortran.h>
#include <liberrno.h>
#include <malloc.h>
#include <string.h>
#include <unistd.h>

extern char *_fc_acopy(_fcd f);

/*
 *      PXFCHROOT       Change the root directory to the
 *                      specified directory.
 *
 *      Call from Fortran:
 *
 *              SUBROUTINE PXFCHROOT (PATH, ILEN, IERROR)
 *              CHARACTER * (*) PATH
 *              INTEGER ILEN, IERROR
 *
 *      Where:
 *
 *      PATH    is an input character variable or array element
 *              containing the name of the new directory.
 *
 *      ILEN    is an input integer variable containing the length
 *              of PATH in characters.  If ILEN is zero, all
 *              trailing blanks are removed before calling chroot().
 *
 *      IERROR  is an output integer variable that will contain the
 *              status:
 *
 *                 Zero if PXFCHROOT is successful; otherwise nonzero.
 *
 *              In addition to the errors returned by the chroot(2)
 *              system call, PXFCHROOT may return the following errors:
 *
 *              EINVAL  If ILEN < 0 or ILEN > LEN(PATH)
 *
 *              ENOMEM  If PXFCHROOT is unable to obtain memory to
 *                      copy PATH.
 */

#ifdef _UNICOS
void
PXFCHROOT(
#else
void
_PXFCHROOT(
#endif
  _fcd  PATH,   /* Character variable containing path */
        /* of new directory */
  _f_int  *ILEN,    /* Length of pathname */
  _f_int  *IERROR)  /* Error Status */
{
  _f_int  arglen, errsts, length;
  char  *argstr, *pthstr;
  errsts  = 0;
  argstr  = _fcdtocp(PATH);
  arglen  = (_f_int) _fcdlen (PATH);
  length  = *ILEN;
  if (length < 0 || length > arglen)
    errsts  = EINVAL;
  else {
    /*
     * If length is zero, strip trailing blanks. Otherwise,
     * malloc memory and copy the string; adding a NULL
     * terminator.
     */
    if (length == 0)
      pthstr  = _fc_acopy(PATH);
    else
      pthstr  = (char *) malloc(length + 1);
    if (pthstr == NULL)     /* If no memory allocated */
      errsts  = ENOMEM;
    else {
      if (length != 0) {      /* Copy argument */
        (void) memcpy(pthstr, argstr, length);
        pthstr[length]  = '\0';
      }
      /* Change directories through chdir() to path. */
      if (chroot(pthstr) == -1)
        errsts  = errno;
      free(pthstr);
    }
  }
  *IERROR = errsts;
  return;
}



#ifndef _UNICOS
void
pxfchroot_(
     char *PATH,            /* Character variable containing path */
                /* of new directory */
     _f_int *ILEN,    /* Length of pathname */
     _f_int *IERROR,  /* Error Status */
     _f_int pathlen)
{
  _PXFCHROOT(_cptofcd(PATH, pathlen), ILEN, IERROR);
}
#endif

---