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The listen function, in C, takes a "backlog" argument as an int. It normally must be positive. However, it may be ngative:
On FreeBSD, since version 2.2, to use the maximum value
On Linux, as an undocumented feature, to use a default value, at least according to @devnexen .
But when listen was added to Nix in change f85e9bf , the backlog argument's type was specified as usize, which precludes negative values. It also will rollover at i32::MAX_VALUE with unpredictable consequences.