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@@ -1,57 +0,0 @@
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-/*
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- * Copyright (c) 2006-2021, RT-Thread Development Team
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- *
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- * SPDX-License-Identifier: Apache-2.0
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- *
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- * Change Logs:
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- * Date Author Notes
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- * 2020-12-16 Meco Man add usleep
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- */
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-#ifndef _SYS_UNISTD_H
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-#define _SYS_UNISTD_H
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-
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-#include <rtconfig.h>
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-#include "types.h"
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-
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-#ifdef RT_USING_DFS
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-
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-#define STDIN_FILENO 0 /* standard input file descriptor */
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-#define STDOUT_FILENO 1 /* standard output file descriptor */
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-#define STDERR_FILENO 2 /* standard error file descriptor */
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-
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-#include <dfs_posix.h>
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-#else
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-#define _FREAD 0x0001 /* read enabled */
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-#define _FWRITE 0x0002 /* write enabled */
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-#define _FAPPEND 0x0008 /* append (writes guaranteed at the end) */
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-#define _FMARK 0x0010 /* internal; mark during gc() */
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-#define _FDEFER 0x0020 /* internal; defer for next gc pass */
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-#define _FASYNC 0x0040 /* signal pgrp when data ready */
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-#define _FSHLOCK 0x0080 /* BSD flock() shared lock present */
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-#define _FEXLOCK 0x0100 /* BSD flock() exclusive lock present */
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-#define _FCREAT 0x0200 /* open with file create */
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-#define _FTRUNC 0x0400 /* open with truncation */
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-#define _FEXCL 0x0800 /* error on open if file exists */
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-#define _FNBIO 0x1000 /* non blocking I/O (sys5 style) */
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-#define _FSYNC 0x2000 /* do all writes synchronously */
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-#define _FNONBLOCK 0x4000 /* non blocking I/O (POSIX style) */
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-#define _FNDELAY _FNONBLOCK /* non blocking I/O (4.2 style) */
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-#define _FNOCTTY 0x8000 /* don't assign a ctty on this open */
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-
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-#endif
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-
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-
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-int isatty (int fd);
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-char * ttyname (int desc);
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-
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-unsigned int sleep(unsigned int seconds);
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-int usleep(useconds_t usec);
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-
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-pid_t getpid(void);
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-pid_t getppid(void);
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-uid_t getuid(void);
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-uid_t geteuid(void);
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-gid_t getgid(void);
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-gid_t getegid(void);
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-
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-#endif /* _SYS_UNISTD_H */
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