[Bug 2089] errno not threadsafe

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=2089

Daniel Ng <daniel.ng1234 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P5                          |P2
           Severity|minor                       |critical

--- Comment #13 from Daniel Ng <daniel.ng1234 at gmail.com>  ---
Without this patch, my system would be broken. I am using uClibc-0.9.31 with a
PowerPC-based arch (Linux 2.6.30).

Without this patch, I would get errno==0 when read() returned -1. The code
doesn't handle such a case (and it shouldn't need to!) and so results in the
system locking up.

I've upped the Priority to P2 Critical.

The patch makes the system behave correctly.

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