HelenOS sources

_Exit              86 common/include/stdlib.h extern void _Exit(int) __attribute__((noreturn));
_Exit              86 kernel/generic/common/include/stdlib.h extern void _Exit(int) __attribute__((noreturn));
_Exit              86 uspace/lib/c/common/include/stdlib.h extern void _Exit(int) __attribute__((noreturn));
_Exit             136 uspace/lib/c/generic/stdlib.c 	_Exit(status);
_Exit             184 uspace/lib/c/generic/stdlib.c 	_Exit(status);
_Exit              86 uspace/lib/posix/include/common/stdlib.h extern void _Exit(int) __attribute__((noreturn));
HelenOS homepage, sources at GitHub