6bcb40fe01
This allows applications to mount filesystems in the os package. This is useful for mounting external flash filesystems, for example.
50 строки
1,2 КиБ
Go
50 строки
1,2 КиБ
Go
// +build baremetal wasm
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package os
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import (
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_ "unsafe"
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)
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// Stdin, Stdout, and Stderr are open Files pointing to the standard input,
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// standard output, and standard error file descriptors.
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var (
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Stdin = &File{stdioFileHandle(0), "/dev/stdin"}
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Stdout = &File{stdioFileHandle(1), "/dev/stdout"}
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Stderr = &File{stdioFileHandle(2), "/dev/stderr"}
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)
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// isOS indicates whether we're running on a real operating system with
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// filesystem support.
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const isOS = false
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// stdioFileHandle represents one of stdin, stdout, or stderr depending on the
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// number. It implements the FileHandle interface.
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type stdioFileHandle uint8
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// Read is unsupported on this system.
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func (f stdioFileHandle) Read(b []byte) (n int, err error) {
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return 0, ErrUnsupported
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}
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// Write writes len(b) bytes to the output. It returns the number of bytes
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// written or an error if this file is not stdout or stderr.
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func (f stdioFileHandle) Write(b []byte) (n int, err error) {
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switch f {
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case 1, 2: // stdout, stderr
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for _, c := range b {
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putchar(c)
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}
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return len(b), nil
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default:
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return 0, ErrUnsupported
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}
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}
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// Close is unsupported on this system.
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func (f stdioFileHandle) Close() error {
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return ErrUnsupported
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}
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//go:linkname putchar runtime.putchar
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func putchar(c byte)
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