fdisk_gpt_is_hybrid ()

int
fdisk_gpt_is_hybrid (struct fdisk_context *cxt);

The regular GPT contains PMBR (dummy protective MBR) where the protective MBR does not address any partitions.

Hybrid GPT contains regular MBR where this partition table addresses the same partitions as GPT. It's recommended to not use hybrid GPT due to MBR limits.

The libfdisk does not provide functionality to sync GPT and MBR, you have to directly access and modify (P)MBR (see fdisk_new_nested_context()).

fdisk_gpt_get_partition_attrs ()

int
fdisk_gpt_get_partition_attrs (struct fdisk_context *cxt,
                               size_t partnum,
                               uint64_t *attrs);

Sets attrs for the given partition

fdisk_gpt_set_partition_attrs ()

int
fdisk_gpt_set_partition_attrs (struct fdisk_context *cxt,
                               size_t partnum,
                               uint64_t attrs);

Sets the GPT partition attributes field to attrs .

GPT_FLAG_REQUIRED

#define GPT_FLAG_REQUIRED 1

GPT attribute; marks a partition as system partition (disk partitioning utilities must preserve the partition as is)

GPT_FLAG_NOBLOCK

#define GPT_FLAG_NOBLOCK 2

GPT attribute; EFI firmware should ignore the content of the partition and not try to read from it

GPT_FLAG_LEGACYBOOT

#define GPT_FLAG_LEGACYBOOT 3

GPT attribute; use the partition for legacy boot method

GPT_FLAG_GUIDSPECIFIC

#define GPT_FLAG_GUIDSPECIFIC 4

GPT attribute; for bites 48-63, defined and used by the individual partition type.

The flag GPT_FLAG_GUIDSPECIFIC forces libfdisk to ask (by ask API) for a bit number. If you want to toggle specific bit and avoid any dialog, then use the bit number (in range 48..63). For example:

// start dialog to ask for bit number fdisk_toggle_partition_flag(cxt, n, GPT_FLAG_GUIDSPECIFIC);

// toggle bit 60 fdisk_toggle_partition_flag(cxt, n, 60);