fcntl.h

利用POS机具硬件改为条纹码扫描器的编程代码

/*  fcntl.h

    Define flag values accessible to open.

    Copyright (c) Borland International 1987,1988,1990,1991
    All Rights Reserved.
*/

#if !defined( __FCNTL_H )
#define __FCNTL_H

#ifdef __DLL__
#define _FAR far
#else
#define _FAR
#endif

#if __STDC__
#define _Cdecl
#else
#define _Cdecl  cdecl
#endif

#ifndef __PAS__
#define _CType _Cdecl
#else
#define _CType pascal
#endif

extern int _Cdecl _fmode;

/* The first three can only be set by open */

#define O_RDONLY         1
#define O_WRONLY         2
#define O_RDWR           4

/* Flag values for open only */

#define O_CREAT     0x0100  /* create and open file */
#define O_TRUNC     0x0200  /* open with truncation */
#define O_EXCL      0x0400  /* exclusive open */

/* The "open flags" defined above are not needed after open, hence they
   are re-used for other purposes when the file is running.  Sorry, its
   getting crowded !
*/
#define _O_RUNFLAGS 0x0700
#define _O_EOF      0x0200 /* set when text file hits ^Z   */

/* a file in append mode may be written to only at its end.
*/
#define O_APPEND    0x0800  /* to end of file */

/* MSDOS special bits */

#define O_CHANGED   0x1000  /* user may read these bits, but    */
#define O_DEVICE    0x2000  /*   only RTL\io functions may touch.   */
#define O_TEXT      0x4000  /* CR-LF translation    */
#define O_BINARY    0x8000  /* no translation   */

/* DOS 3.x options */

#define O_NOINHERIT 0x80
#define O_DENYALL   0x10
#define O_DENYWRITE 0x20
#define O_DENYREAD  0x30
#define O_DENYNONE  0x40

#endif  /* __FCNTL_H */