I was shocked (and impressed) when I looked at some of djb's code and saw that he put his "the return value of
every syscall must be checked" view into practice so consistently that every single printf() (not only fprintf()!) was inside an if block that checked whether it succeeded in writing to stdout or not.
Of course, printf() does have a return value ("Upon successful return, these functions return the number of characters printed"), and it can fail... but it takes a considerable consistency of purpose to decide to deal with that possibility explicitly every single time.
