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设备才能实现，因此如果无法获取 rtc 设备应当断言
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重新实现,通常需要关闭中断,关闭IO输出等
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- _sys_istty() add stdio as tty
- without this, after exit vi program getchar will return -1, I don't know why it works
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Signed-off-by: yangfasheng <[email protected]>
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support时cmd为随机数据,可能导致c库初始化时在此函数返回处死循环或跑飞.
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[libc] dependence update:
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RT_USING_CONSOLE and RT_USING_DEVICE
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Add cconfig.h file for different version of GCC, which is automatically
detected and generated by scons script.
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armlibc/sys/unistd.h.
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1. Add termios test. 2.Add termios.h
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1. Add macro check in rtdebug.h;
2. Use RT_USING_POSIX for poll/select, stdin etc.
3. Split dfs_posix.h to dfs_posix.h, dfs_poll.h and dfs_select.h;
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1. Add POSIX termios implementation;
2. Add POSIX signals implementation;
3. Add stdio for each libc.
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