fcc_open
ret = fcc_open(context, id, &fd, O_RDONLY | O_BINARY | O_CLOEXEC, 0);
ret = fcc_open(context, id, &fd, O_RDWR | O_CREAT | O_EXCL | O_BINARY | O_CLOEXEC, 0600);
ret = fcc_open(context, id, &fd, O_WRONLY | O_APPEND | O_BINARY | O_CLOEXEC, 0);
ret = fcc_open(context, id, &fd, O_RDONLY | O_BINARY | O_CLOEXEC, 0);
ret = fcc_open(context, from, &fd1, O_RDONLY | O_BINARY | O_CLOEXEC, 0);
ret = fcc_open(context, to, &fd2,