HelenOS sources

O_CREAT           110 uspace/lib/posix/src/fcntl.c 	if (posix_flags & O_CREAT) {
O_CREAT           127 uspace/lib/posix/src/fcntl.c 	if (posix_flags & O_CREAT) {
O_CREAT            60 uspace/lib/posix/test/stdlib.c 	file = open(p, O_CREAT | O_EXCL | O_RDWR, 0600);
O_CREAT            68 uspace/lib/posix/test/unistd.c 	file = open(name, O_CREAT | O_EXCL | O_RDWR, 0600);
HelenOS homepage, sources at GitHub