34 lines
1.4 KiB
Plaintext
34 lines
1.4 KiB
Plaintext
import vpsdk.syscall as _syscall
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import t, c
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import viperlib
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# ============================================================
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# vpsdk.stdio - 用户态 printf/exit（CExport 裸名，供内核侧代码
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# 如 includes/memhub.vp 跨模块引用解析）
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#
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# 裸机 App 无 libc：printf 走 viperlib.vsnprintf 格式化 + SERIAL_PUTS
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# syscall 输出到串口；exit 走 EXIT syscall 通知内核销毁本进程窗口。
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# ============================================================
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def printf(fmt: t.CConst | str, *args) -> t.CInt | t.CExport:
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"""格式化输出到串口（SERIAL_PUTS syscall），返回输出字节数"""
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if fmt is None:
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return 0
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buf: t.CArray[t.CChar, 1024]
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n: t.CInt = viperlib.vsnprintf(c.Addr(buf), 1024, fmt, args)
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_syscall._syscall1(t.CUInt64T(_syscall.SERIAL_PUTS), t.CUInt64T(c.Addr(buf)))
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return n
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def exit(status: t.CInt) -> t.CVoid | t.CExport:
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"""终止当前进程（EXIT syscall：销毁本进程窗口）"""
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_syscall._syscall1(t.CUInt64T(_syscall.EXIT), t.CUInt64T(status))
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def fflush(stream: t.CConst | t.CVoid | t.CPtr) -> t.CInt | t.CExport:
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"""刷新输出流：串口/控制台输出都是直写，无缓冲可刷，空操作返回 0
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覆盖 libc fflush 的裸机缺失（includes/memhub.vp 的诊断/终止路径 call @fflush）；
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与 printf/exit 同为 CExport 裸名，供内核侧 includes 跨模块引用解析。
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"""
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return 0
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