HelenOS sources

EOF                39 boot/generic/include/printf.h #define EOF  (-1)
EOF                42 kernel/generic/include/print.h #define EOF  (-1)
EOF                57 uspace/lib/c/include/stdio.h #define EOF  (-1)
EOF                57 uspace/lib/posix/include/libc/stdio.h #define EOF  (-1)
HelenOS homepage, sources at GitHub