ioctl.h

来自「俄罗斯高人Mamaich的Pocket gcc编译器（运行在PocketPC上）」· C头文件 代码 · 共 84 行

/* Copyright (C) 1991, 92, 93, 94, 96, 98, 99 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

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

#ifndef	_SYS_IOCTL_H
#define	_SYS_IOCTL_H	1

#include <features.h>

__BEGIN_DECLS

/* 
 * SOCKET IOCTL's:
 * Ioctl's have the command encoded in the lower word,
 * and the size of any in or out parameters in the upper
 * word.  The high 2 bits of the upper word are used
 * to encode the in/out status of the parameter; for now
 * we restrict parameters to at most 128 bytes.
 */
#define IOCPARM_MASK   (0x7ff)          /* parameters must be < 2k bytes */
#define	IOCGROUP(x)	   (((x) >> 8) & 0xff)
#define IOC_VOID       (0x20000000)     /* no parameters */
#define IOC_OUT        (0x40000000)     /* copy out parameters */
#define IOC_IN         (0x80000000_     /* copy in parameters */
#define IOC_INOUT      (IOC_IN|IOC_OUT)
#define	_IOC(inout,group,num,len) \
	(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
#define	_IO(g,n)	_IOC(IOC_VOID,	(g), (n), 0)
#define	_IOR(g,n,t)	_IOC(IOC_OUT,	(g), (n), sizeof(t))
#define	_IOW(g,n,t)	_IOC(IOC_IN,	(g), (n), sizeof(t))
/* this should be _IORW, but stdio got there first */
#define	_IOWR(g,n,t)	_IOC(IOC_INOUT,	(g), (n), sizeof(t))


#define FIONREAD    _IOR('f', 127, unsigned long) /* get # bytes to read */
#define FIONBIO     _IOW('f', 126, unsigned long) /* set/clear non-blocking i/o */
#define FIOASYNC    _IOW('f', 125, unsigned long) /* set/clear async i/o */

/* Socket I/O Controls */
#define SIOCSHIWAT  _IOW('s',  0, unsigned long)  /* set high watermark */
#define SIOCGHIWAT  _IOR('s',  1, unsigned long)  /* get high watermark */
#define SIOCSLOWAT  _IOW('s',  2, unsigned long)  /* set low watermark */
#define SIOCGLOWAT  _IOR('s',  3, unsigned long)  /* get low watermark */
#define SIOCATMARK  _IOR('s',  7, unsigned long)  /* at oob mark? */

/*!! CAV */
#if 0
/* Get the list of `ioctl' requests and related constants.  */
#include <bits/ioctls.h>

/* Define some types used by `ioctl' requests.  */
#include <bits/ioctl-types.h>

/* On a Unix system, the system <sys/ioctl.h> probably defines some of
   the symbols we define in <sys/ttydefaults.h> (usually with the same
   values).  The code to generate <bits/ioctls.h> has omitted these
   symbols to avoid the conflict, but a Unix program expects <sys/ioctl.h>
   to define them, so we must include <sys/ttydefaults.h> here.  */
#include <sys/ttydefaults.h>
#endif

/* Perform the I/O control operation specified by REQUEST on FD.
   One argument may follow; its presence and type depend on REQUEST.
   Return value depends on REQUEST.  Usually -1 indicates error.  */
extern int ioctl (int __fd, unsigned int __request, void *arg) __THROW;

__END_DECLS

#endif /* sys/ioctl.h */