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> Hmm. So under what conditions should it continue, and under what 
> conditions should it raise an exception (when errno is EINTR)?
EINTR indicates a temporary failure. In that case it should always retry.
A common macro for handling that might look like this:
#define RETRY_ON_EINTR(x) ({ \
 typeof(x) rv; \
 do { rv = x; } while (rv < 0 && errno == EINTR); \
 rv;\
})
But from what I understand, braces in parentheses are a GCC extension.