Zbigniew Jędrzejewski-Szmek
b7cba81553
The code was written unidiomatically, using r as a boolean value, and confusing errno and r in some places. AFAICS, there wasn't any actual problem: even in the one place where errno was used instead of r, it would almost certainly be initialized. It seems that some libbpf functions set errno, while others return the error, possibly encoded. Since there are almost no docs, the only way to know is to read the code of the function. To make matters worse, there is a global libbpf_mode which can be set to change the convention. With LIBBPF_STRICT_DIRECT_ERRS in libbpf_mode, some functions set errno while others return a negative error, and the only way to know is to read the code, except that the split is now different. We currently don't set LIBBPF_STRICT_DIRECT_ERRS, but even the possibility makes everything harder to grok. This is all very error-prone. Let's at least add some asserts to make sure that the returned values are as expected.
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