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Before this change Open("name", os.O_RDONLY|os.O_TRUNC) would have
truncated the file. This is what Linux does, but is counterintuitive.
POSIX states this is undefined, so return an error in this case
instead. This preserves the invariant O_RDONLY => file is not
changed.
50 lines
902 B
Go
50 lines
902 B
Go
// Cross platform errors
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package vfs
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import (
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"fmt"
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"os"
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)
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// Error describes low level errors in a cross platform way.
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type Error byte
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// NB if changing errors translateError in cmd/mount/fs.go, cmd/cmount/fs.go
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// Low level errors
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const (
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OK Error = iota
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ENOTEMPTY
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ESPIPE
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EBADF
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EROFS
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ENOSYS
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)
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// Errors which have exact counterparts in os
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var (
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ENOENT = os.ErrNotExist
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EEXIST = os.ErrExist
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EPERM = os.ErrPermission
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EINVAL = os.ErrInvalid
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// ECLOSED see errors_{old,new}.go
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)
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var errorNames = []string{
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OK: "Success",
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ENOTEMPTY: "Directory not empty",
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ESPIPE: "Illegal seek",
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EBADF: "Bad file descriptor",
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EROFS: "Read only file system",
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ENOSYS: "Function not implemented",
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}
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// Error renders the error as a string
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func (e Error) Error() string {
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if int(e) >= len(errorNames) {
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return fmt.Sprintf("Low level error %d", e)
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}
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return errorNames[e]
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}
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