ref: 7a153b0a4dfd9ba85e98aafcf61afefcbe4c99f0 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; }