github.com/wasilibs/wazerox@v0.0.0-20240124024944-4923be63ab5f/experimental/sys/error.go (about)

     1  package sys
     2  
     3  import (
     4  	"io"
     5  	"io/fs"
     6  	"os"
     7  )
     8  
     9  // UnwrapOSError returns an Errno or zero if the input is nil.
    10  func UnwrapOSError(err error) Errno {
    11  	if err == nil {
    12  		return 0
    13  	}
    14  	err = underlyingError(err)
    15  	switch err {
    16  	case nil, io.EOF:
    17  		return 0 // EOF is not a Errno
    18  	case fs.ErrInvalid:
    19  		return EINVAL
    20  	case fs.ErrPermission:
    21  		return EPERM
    22  	case fs.ErrExist:
    23  		return EEXIST
    24  	case fs.ErrNotExist:
    25  		return ENOENT
    26  	case fs.ErrClosed:
    27  		return EBADF
    28  	}
    29  	return errorToErrno(err)
    30  }
    31  
    32  // underlyingError returns the underlying error if a well-known OS error type.
    33  //
    34  // This impl is basically the same as os.underlyingError in os/error.go
    35  func underlyingError(err error) error {
    36  	switch err := err.(type) {
    37  	case *os.PathError:
    38  		return err.Err
    39  	case *os.LinkError:
    40  		return err.Err
    41  	case *os.SyscallError:
    42  		return err.Err
    43  	}
    44  	return err
    45  }