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sd-login: update header docs a bit
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@ -34,7 +34,9 @@ extern "C" {
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* Instead of returning an empty string array or empty uid array, we
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* may return NULL.
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*
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* Free the data we return with libc free().
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* Free the data the library returns with libc free(). String arrays
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* are NULL terminated and you need to free the array itself in
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* addition to the strings contained.
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*
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* We return error codes as negative errno, kernel-style. 0 or
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* positive on success.
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