Tom bcb9363a97 LibPthread: Return errors as positive return values ...

pthread implementations generally return errors as a positive non-zero
value. Our kernel generally returns errors as negative values. If we
receive a negative value from a system call, turn it into a positive
return value to relay the error appropriately.

Also, fix the tt test utility to not rely on errno, as the pthread
library does not use errno.

2020-12-12 21:28:12 +01:00

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