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