ref: 65e0e1c3e37c966d0c18178ad8a4c54c0c0fbce9 dir: /sys/src/ape/lib/ap/plan9/fsync.c/
#include <sys/types.h> #include <unistd.h> #include <errno.h> int fsync(int fd) { errno = EINVAL; return -1; }