Bug of libcsupport open?

[Wei Shen]

Hi,

If "iop->handlers->open_h" returns an error, "open" will call
"rtems_set_errno_and_return_minus_one( rc )" which sets "errno" to "rc",
where "rc" is the return value of "open_h".
However, the "open_h" handler implemented by each filesystem usually already
sets "errno" and returns only -1 at errors, so "open" will override "errno"
with -1 which is not a valid errno.

Regards,
Wei
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