lockf function
Implementation
int lockf(
int fd,
int cmd,
int len,
) {
_lockf ??= Libc().dylib.lookupFunction<
ffi.Int32 Function(ffi.Int32, ffi.Int32, ffi.Int64),
_dart_lockf>('lockf');
return _lockf!(
fd,
cmd,
len,
);
}