a2d0f79be3
So far, we've pretended to be js/wasm in baremetal targets to make the
stdlib happy. Unfortunately, this has various problems because
syscall/js (a dependency of many stdlib packages) thinks it can do JS
calls, and emulating them gets quite hard with all changes to the
syscall/js packages in Go 1.12.
This commit does a few things:
* It lets baremetal targets pretend to be linux/arm instead of
js/wasm.
* It lets the loader only select particular packages from the src
overlay, instead of inserting them just before GOROOT. This makes it
possible to pick which packages to overlay for a given target.
* It adds a baremetal-only syscall package that stubs out almost all
syscalls.
34 строки
676 Б
Go
34 строки
676 Б
Go
// +build avr cortexm 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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// Read is unsupported on this system.
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func (f *File) 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 *File) Write(b []byte) (n int, err error) {
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switch f.fd {
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case Stdout.fd, Stderr.fd:
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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 *File) 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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