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      1 /* Calls to enable and disable swapping on specified locations.  Linux version.
      2    Copyright (C) 1996, 1998, 1999 Free Software Foundation, Inc.
      3    This file is part of the GNU C Library.
      4 
      5    The GNU C Library is free software; you can redistribute it and/or
      6    modify it under the terms of the GNU Lesser General Public
      7    License as published by the Free Software Foundation; either
      8    version 2.1 of the License, or (at your option) any later version.
      9 
     10    The GNU C Library is distributed in the hope that it will be useful,
     11    but WITHOUT ANY WARRANTY; without even the implied warranty of
     12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13    Lesser General Public License for more details.
     14 
     15    You should have received a copy of the GNU Lesser General Public
     16    License along with the GNU C Library; if not, write to the Free
     17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
     18    02111-1307 USA.  */
     19 
     20 #ifndef _SYS_SWAP_H
     21 
     22 #define _SYS_SWAP_H	1
     23 #include <features.h>
     24 
     25 /* The swap priority is encoded as:
     26    (prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK
     27 */
     28 #define	SWAP_FLAG_PREFER	0x8000	/* Set if swap priority is specified. */
     29 #define	SWAP_FLAG_PRIO_MASK	0x7fff
     30 #define	SWAP_FLAG_PRIO_SHIFT	0
     31 
     32 __BEGIN_DECLS
     33 
     34 /* Make the block special device PATH available to the system for swapping.
     35    This call is restricted to the super-user.  */
     36 extern int swapon (__const char *__path, int __flags) __THROW;
     37 
     38 /* Stop using block special device PATH for swapping.  */
     39 extern int swapoff (__const char *__path) __THROW;
     40 
     41 __END_DECLS
     42 
     43 #endif /* _SYS_SWAP_H */
     44