Golang C.__s64类(方法)实例源码

func subvolSnapshot(src, dest, name string) error {
	srcDir, err := openDir(src)
	if err != nil {
		return err
	}
	defer closeDir(srcDir)

	destDir, err := openDir(dest)
	if err != nil {
		return err
	}
	defer closeDir(destDir)

	var args C.struct_btrfs_ioctl_vol_args_v2
	args.fd = C.__s64(getDirFd(srcDir))

	var cs = C.CString(name)
	C.set_name_btrfs_ioctl_vol_args_v2(&args, cs)
	C.free(unsafe.Pointer(cs))

	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(destDir), C.BTRFS_IOC_SNAP_CREATE_V2,
		uintptr(unsafe.Pointer(&args)))
	if errno != 0 {
		return fmt.Errorf("Failed to create btrfs snapshot: %v", errno.Error())
	}
	return nil
}

func subvolSnapshot(src, dest, name string) error {
	srcDir, err := openDir(src)
	if err != nil {
		return err
	}
	defer closeDir(srcDir)

	destDir, err := openDir(dest)
	if err != nil {
		return err
	}
	defer closeDir(destDir)

	var args C.struct_btrfs_ioctl_vol_args_v2
	args.fd = C.__s64(getDirFd(srcDir))
	for i, c := range []byte(name) {
		args.name[i] = C.char(c)
	}

	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, getDirFd(destDir), C.BTRFS_IOC_SNAP_CREATE_V2,
		uintptr(unsafe.Pointer(&args)))
	if errno != 0 {
		return fmt.Errorf("Failed to create btrfs snapshot: %v", errno.Error())
	}
	return nil
}

func ffiSubvolumeSnapshot(src string, dest string, readOnly bool) error {
	srcDir, err := ffiOpenDir(src)
	if err != nil {
		return err
	}
	defer ffiCloseDir(srcDir)
	var args C.struct_btrfs_ioctl_vol_args_v2
	args.fd = C.__s64(ffiGetDirFd(srcDir))
	if readOnly {
		args.flags |= C.__u64(C.BTRFS_SUBVOL_RDONLY)
	}
	for i, c := range []byte(filepath.Base(dest)) {
		args.name[i] = C.char(c)
	}
	return ffiIoctl(filepath.Dir(dest), C.BTRFS_IOC_SNAP_CREATE_V2, uintptr(unsafe.Pointer(&args)))
}