Re: errno from open() ?

[Tim Rühsen]

On Montag, 22. Mai 2017 08:00:14 CEST Paul Eggert wrote:
> On 05/22/2017 03:58 AM, Tim Rühsen wrote:
> > on GNU/Linux open() on a directory returns -1 and sets errno to EISDIR.
> 
> No, for example on my platform (Fedora 25 x86-64), 'strace cat .'
> outputs the line 'open(".", O_RDONLY) = 3'.

Same here on Debian unstable.
What you want to say is, that it depends on the flags.
And you are right, I wasn't very precise in that point.

Here we use
fd = open(fname, O_WRONLY | flag | O_CREAT | O_NONBLOCK | O_BINARY, S_IRUSR | 
S_IWUSR | S_IRGRP | S_IROTH);

'flag' might be one of O_TRUNC, O_APPEND or O_EXCL.

A test with different flags for open(<existing directory>) shows failure + 
errno EISDIR when opening for writing.

With Best Regards, Tim

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