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ioctl.h
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1 /*
2  * Linux/PA-RISC Project (http://www.parisc-linux.org/)
3  * Copyright (C) 1999,2003 Matthew Wilcox < willy at debian . org >
4  * portions from "linux/ioctl.h for Linux" by H.H. Bergman.
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  */
20 
21 
22 #ifndef _ASM_PARISC_IOCTL_H
23 #define _ASM_PARISC_IOCTL_H
24 
25 /* ioctl command encoding: 32 bits total, command in lower 16 bits,
26  * size of the parameter structure in the lower 14 bits of the
27  * upper 16 bits.
28  * Encoding the size of the parameter structure in the ioctl request
29  * is useful for catching programs compiled with old versions
30  * and to avoid overwriting user space outside the user buffer area.
31  * The highest 2 bits are reserved for indicating the ``access mode''.
32  * NOTE: This limits the max parameter size to 16kB -1 !
33  */
34 
35 /*
36  * Direction bits.
37  */
38 #define _IOC_NONE 0U
39 #define _IOC_WRITE 2U
40 #define _IOC_READ 1U
41 
42 #include <asm-generic/ioctl.h>
43 
44 #endif /* _ASM_PARISC_IOCTL_H */