text: /*  Part of SWI-Prolog
  
      Author:        Jan Wielemaker
      E-mail:        J.Wielemaker@vu.nl
      WWW:           http://www.swi-prolog.org
      Copyright (c)  2002-2014, University of Amsterdam
      All rights reserved.
  
      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions
      are met:
  
      1. Redistributions of source code must retain the above copyright
         notice, this list of conditions and the following disclaimer.
  
      2. Redistributions in binary form must reproduce the above copyright
         notice, this list of conditions and the following disclaimer in
         the documentation and/or other materials provided with the
         distribution.
  
      THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
      FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
      COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 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.
  */
  
  #include <config.h>
  
  #ifdef HAVE_SYS_TIME_H
  #include <sys/time.h>
  #endif
  #ifdef HAVE_SYS_RESOURCE_H
  #include <sys/resource.h>
  #endif
  #ifdef HAVE_UNISTD_H
  #include <unistd.h>
  #endif
  #include <string.h>
  #include <signal.h>
  #include <errno.h>
  #include <SWI-Prolog.h>
  #include "clib.h"
  
  /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
  Provide	an interface to the Unix system resources (getrlimit()/setrlimit()).
  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
  
  #if !defined(RLIMIT_NOFILE) && defined(RLIMIT_OFILE)
  #define RLIMIT_NOFILE RLIMIT_OFILE
  #endif
  
  foreign_t
  pl_rlimit(term_t what, term_t old, term_t new)
  { char *s;
    int resource;
    struct rlimit rlim;
  
    if ( PL_get_atom_chars(what, &s) )
    { if      ( strcmp(s, "cpu") == 0 )
        resource = RLIMIT_CPU;
      else if ( strcmp(s, "fsize") == 0 )
        resource = RLIMIT_FSIZE;
      else if ( strcmp(s, "data") == 0 )
        resource = RLIMIT_DATA;
      else if ( strcmp(s, "stack") == 0 )
        resource = RLIMIT_STACK;
      else if ( strcmp(s, "core") == 0 )
        resource = RLIMIT_CORE;
  #ifdef RLIMIT_RSS
      else if ( strcmp(s, "rss") == 0 )
        resource = RLIMIT_RSS;
  #endif
  #ifdef RLIMIT_AS
      else if ( strcmp(s, "as") == 0 )
        resource = RLIMIT_AS;
  #endif
  #ifdef RLIMIT_MEMLOCK
      else if ( strcmp(s, "memlock") == 0 )
        resource = RLIMIT_MEMLOCK;
  #endif
  #ifdef RLIMIT_NPROC
      else if ( strcmp(s, "nproc") == 0 )
        resource = RLIMIT_NPROC;
  #endif
  #ifdef RLIMIT_NOFILE
      else if ( strcmp(s, "nofile") == 0 )
        resource = RLIMIT_NOFILE;
  #endif
      else
        return pl_error("rlimit", 3, NULL, ERR_DOMAIN,
  		      what, "resource");
    } else
      return pl_error("rlimit", 3, NULL, ERR_TYPE,
  		    what, "atom");
  
    if ( getrlimit(resource, &rlim) == 0 )
    { int rval;
  
      if ( rlim.rlim_cur == RLIM_INFINITY )
        rval = PL_unify_atom_chars(old, "unlimited");
      else
        rval = PL_unify_int64(old, rlim.rlim_cur);
  
      if ( rval )
      { int64_t n;
  
        if ( PL_get_int64(new, &n) )
        {
        set:
  	if ( rlim.rlim_cur != (rlim_t) n )
  	{ rlim.rlim_cur = n;
  	  if ( setrlimit(resource, &rlim) != 0 )
  	    return pl_error("rlimit", 3, NULL, ERR_ERRNO, errno, "set", "resource_limit", what);
  	}
  	return TRUE;
        } else if ( PL_get_atom_chars(new, &s) && strcmp(s, "unlimited") == 0 )
        { n = RLIM_INFINITY;
  	goto set;
        } else
  	return pl_error("rlimit", 3, NULL, ERR_TYPE,
  			new, "integer_or_unlimited");
      } else
        return FALSE;
    } else
      return pl_error("rlimit", 3, NULL, ERR_ERRNO, errno, "get",  "resource_limit", what);
  }
  
  
  install_t
  install_rlimit()
  { PL_register_foreign("rlimit", 3, pl_rlimit, 0);
  }
  