fcntl.h

[随书类]Dos6.0源代码

/***
*fcntl.h - file control options used by open()
*
*   Copyright (c) 1985-1988, Microsoft Corporation.  All rights reserved.
*
*Purpose:
*   This file defines constants for the file control options used
*   by the open() function.
*   [System V]
*
*******************************************************************************/

#define O_RDONLY    0x0000  /* open for reading only */
#define O_WRONLY    0x0001  /* open for writing only */
#define O_RDWR      0x0002  /* open for reading and writing */
#define O_APPEND    0x0008  /* writes done at eof */

#define O_CREAT     0x0100  /* create and open file */
#define O_TRUNC     0x0200  /* open and truncate */
#define O_EXCL      0x0400  /* open only if file doesn't already exist */

/* O_TEXT files have <cr><lf> sequences translated to <lf> on read()'s,
** and <lf> sequences translated to <cr><lf> on write()'s
*/

#define O_TEXT      0x4000  /* file mode is text (translated) */
#define O_BINARY    0x8000  /* file mode is binary (untranslated) */

/* macro to translate the C 2.0 name used to force binary mode for files */

#define O_RAW   O_BINARY

/* Open handle inherit bit */

#define O_NOINHERIT 0x0080      /* child process doesn't inherit file */