Coup de torchon

The name of this movie is Coup de torchon released in 1981-11-04 and it's main theme is In 1938 in the french West Africa, Lucien Cordier is a weak and corrupted policeman despised by the local bad boys. His wife is openly cheating on him and he hasn't got any self-respect anymore. But when comes the occasion, his revenge will be terrible..