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並前往https://coderedirect.com/questions/523755/why-return-a-negative-errno-e-g-return-eio

Why return a negative errno? (e.g. return -EIO) - Code Redirect

Another simple example:if (wpa_s->mlme.ssid_len == 0) return -EINVAL; Why the unary minus? Is this (usually) done for functions that return >0 on success ...

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