On 04/27/2018 03:23 AM, gaosheng cui wrote: Beyond what's stated in "gnulib/lib/ignore-value.h"? Not sure how much more can be said - it does what it says it does - ignores the return value. For instance, if there's a function that is returning either NULL or some strdup'd string and will check and error based off the return, then you have: ignore_value(VIR_STRDUP(target, source)); return target; What would be the point of indicating the VIR_STRDUP failed, then returning to the caller and having it produce a different error message? John