36bf277534
This forces all syscall functions, notably filesystem, to return numeric codes as opposed to mapping in two different areas. The result of this change is better consolidation in call sites of `sysfs.FS`, while further refactoring is needed to address consolidation of file errors. Signed-off-by: Adrian Cole <adrian@tetrate.io>
114 lines
2.9 KiB
Go
114 lines
2.9 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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// ErrnoFault Bad address.
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ErrnoFault = &Errno{"EFAULT"}
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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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// ErrnoRofs read-only file system.
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ErrnoRofs = &Errno{"EROFS"}
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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.EFAULT:
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return ErrnoFault
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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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case syscall.EROFS:
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return ErrnoRofs
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default:
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return ErrnoIo
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}
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}
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