Re: open '>:encoding(UTF-8)' masking write errors?

On Sat, Jun 17, 2017 at 03:25:59PM +0100, Dave Mitchell wrote:
> Consider the following code:
> 
>     my $data = 'x' x 1024;
>     my $file = '/dev/full';
> 
>     open my $out, '>:encoding(UTF-8)', $file
>         or die "Error: can't open '$file' for writing: $!\n";
>     print $out $data or die "Error: writing to file '$file': $!\n";
>     close $out       or die "Error: closing file '$file': $!\n";
> 
> It runs without error, which I find surprising and disturbing.
> Changing the open line to
> 
>     open my $out, '>', $file
> 
> gives the error I expect:
> 
>     Error: closing file '/dev/full': No space left on device
> 
> Is this a bug or do I have unrealistic expectations?
> 
> An strace shows that in both cases, the OS is returning an error:
> 
>     write(4, "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"..., 1024) = -1 ENOSPC (No space left on device)

That looks like a bug to me.

Tony

• open '>:encoding(UTF-8)' masking write errors? by Dave Mitchell
• Re: open '>:encoding(UTF-8)' masking write errors? by Tony Cook
• Re: open '>:encoding(UTF-8)' masking write errors? by Sawyer X