//==========================================================================////      io/common/include/file.h////      Defines for high level file I/O////==========================================================================//####COPYRIGHTBEGIN####//                                                                          // -------------------------------------------                              // The contents of this file are subject to the Red Hat eCos Public License // Version 1.1 (the "License"); you may not use this file except in         // compliance with the License.  You may obtain a copy of the License at    // http://www.redhat.com/                                                   //                                                                          // Software distributed under the License is distributed on an "AS IS"      // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the // License for the specific language governing rights and limitations under // the License.                                                             //                                                                          // The Original Code is eCos - Embedded Configurable Operating System,      // released September 30, 1998.                                             //                                                                          // The Initial Developer of the Original Code is Red Hat.                   // Portions created by Red Hat are                                          // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             // All Rights Reserved.                                                     // -------------------------------------------                              //                                                                          //####COPYRIGHTEND####//==========================================================================//#####DESCRIPTIONBEGIN####//// Author(s):    gthomas// Contributors: gthomas// Date:         2000-01-10// Purpose:      // Description:  //              ////####DESCRIPTIONEND####////==========================================================================#ifndef _CYG_IO_FILE_H_#define _CYG_IO_FILE_H_// High-level file I/O interfaces// Derived [in part] from OpenBSD <sys/file.h>, <sys/uio.h>, <sys/fcntl.h>#include <pkgconf/io.h>#include <cyg/infra/cyg_type.h>#define NFILE CYGPKG_IO_NFILEstruct iovec {    void           *iov_base;   /* Base address. */    CYG_ADDRWORD   iov_len;     /* Length. */};enum	uio_rw { UIO_READ, UIO_WRITE };/* Segment flag values. */enum uio_seg {    UIO_USERSPACE,		/* from user data space */    UIO_SYSSPACE		/* from system space */};struct uio {    struct	iovec *uio_iov;	/* pointer to array of iovecs */    int	uio_iovcnt;	/* number of iovecs in array */    CYG_ADDRWORD	uio_offset;	/* offset into file this uio corresponds to */    CYG_ADDRWORD	uio_resid;	/* residual i/o count */    enum	uio_seg uio_segflg; /* see above */    enum	uio_rw uio_rw;	/* see above */};/* * Limits */#define UIO_SMALLIOV	8		/* 8 on stack, else malloc */// Description of open filestruct file {    short	f_flag;		/* file state */    short	f_type;		/* descriptor type */    struct	fileops {        int	(*fo_read)(struct file *fp, struct uio *uio);        int	(*fo_write)(struct file *fp, struct uio *uio);        int	(*fo_ioctl)(struct file *fp, CYG_ADDRWORD com,                            CYG_ADDRWORD data);        int	(*fo_select)(struct file *fp, int which);        int	(*fo_close)(struct file *fp);    } *f_ops;    CYG_ADDRWORD	f_offset;    CYG_ADDRWORD	f_data;		/* vnode or socket */};// File states#define FREAD      0x01#define FWRITE     0x02#define FNONBLOCK  0x10#define FASYNC     0x20#define FALLOC     0x80         // File is "busy", i.e. allocated// Type of "file"#define	DTYPE_VNODE	1	/* file */#define	DTYPE_SOCKET	2	/* communications endpoint */#define	DTYPE_PIPE	3	/* pipe */externC cyg_bool getfp(int fdes, struct file **fp);externC int falloc(struct file **fp, int *fd);externC void ffree(struct file *fp);#endif // _CYG_IO_FILE_H_