70924aa7a1
This handles EOF even if current and possibly future wasi don't have a way to propagate an EOF signal. This is mainly to match up with go semantics and ensure we don't have any error conditions (by adding tests). Signed-off-by: Adrian Cole <adrian@tetrate.io>
106 lines
2.7 KiB
Go
106 lines
2.7 KiB
Go
package gojs
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import (
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"io"
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"syscall"
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"github.com/tetratelabs/wazero/internal/platform"
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)
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// Errno is a (GOARCH=wasm) error, which must match a key in mapJSError.
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//
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// See https://github.com/golang/go/blob/go1.20/src/syscall/tables_js.go#L371-L494
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type Errno struct {
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s string
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}
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// Error implements error.
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func (e *Errno) Error() string {
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return e.s
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}
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// This order match constants from wasi_snapshot_preview1.ErrnoSuccess for
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// easier maintenance.
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var (
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// ErrnoAcces Permission denied.
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ErrnoAcces = &Errno{"EACCES"}
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// ErrnoAgain Resource unavailable, or operation would block.
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ErrnoAgain = &Errno{"EAGAIN"}
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// ErrnoBadf Bad file descriptor.
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ErrnoBadf = &Errno{"EBADF"}
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// ErrnoExist File exists.
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ErrnoExist = &Errno{"EEXIST"}
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// ErrnoIntr Interrupted function.
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ErrnoIntr = &Errno{"EINTR"}
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// ErrnoInval Invalid argument.
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ErrnoInval = &Errno{"EINVAL"}
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// ErrnoIo I/O error.
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ErrnoIo = &Errno{"EIO"}
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// ErrnoIsdir Is a directory.
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ErrnoIsdir = &Errno{"EISDIR"}
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// ErrnoLoop Too many levels of symbolic links.
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ErrnoLoop = &Errno{"ELOOP"}
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// ErrnoNametoolong Filename too long.
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ErrnoNametoolong = &Errno{"ENAMETOOLONG"}
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// ErrnoNoent No such file or directory.
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ErrnoNoent = &Errno{"ENOENT"}
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// ErrnoNosys function not supported.
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ErrnoNosys = &Errno{"ENOSYS"}
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// ErrnoNotdir Not a directory or a symbolic link to a directory.
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ErrnoNotdir = &Errno{"ENOTDIR"}
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// ErrnoNotempty Directory not empty.
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ErrnoNotempty = &Errno{"ENOTEMPTY"}
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// ErrnoNotsup Not supported, or operation not supported on socket.
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ErrnoNotsup = &Errno{"ENOTSUP"}
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// ErrnoPerm Operation not permitted.
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ErrnoPerm = &Errno{"EPERM"}
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)
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// ToErrno maps I/O errors as the message must be the code, ex. "EINVAL", not
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// the message, e.g. "invalid argument".
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//
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// This should match wasi_snapshot_preview1.ToErrno for maintenance ease.
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func ToErrno(err error) *Errno {
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if err == nil || err == io.EOF {
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return nil // io.EOF has no value in GOOS=js, and isn't an error.
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}
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errno := platform.UnwrapOSError(err)
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switch errno {
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case syscall.EACCES:
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return ErrnoAcces
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case syscall.EAGAIN:
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return ErrnoAgain
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case syscall.EBADF:
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return ErrnoBadf
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case syscall.EEXIST:
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return ErrnoExist
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case syscall.EINTR:
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return ErrnoIntr
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case syscall.EINVAL:
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return ErrnoInval
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case syscall.EIO:
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return ErrnoIo
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case syscall.EISDIR:
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return ErrnoIsdir
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case syscall.ELOOP:
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return ErrnoLoop
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case syscall.ENAMETOOLONG:
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return ErrnoNametoolong
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case syscall.ENOENT:
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return ErrnoNoent
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case syscall.ENOSYS:
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return ErrnoNosys
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case syscall.ENOTDIR:
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return ErrnoNotdir
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case syscall.ENOTEMPTY:
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return ErrnoNotempty
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case syscall.ENOTSUP:
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return ErrnoNotsup
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case syscall.EPERM:
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return ErrnoPerm
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default:
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return ErrnoIo
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}
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}
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