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cc [ flag .\|.\|. ] file.\|.\|. -lefi [ library .\|.\|. ] #include <sys/vtoc.h> #include <sys/efi_partition.h> int efi_alloc_and_init(int fd, uint32_t nparts, dk_gpt_t **vtoc);
int efi_alloc_and_read(int fd, dk_gpt_t **vtoc);
void efi_free(dk_gpt_t *vtoc);
int efi_write(int fd, dk_gpt_t *vtoc);
int efi_use_whole_disk(int fd);
The efi_alloc_and_init() function initializes the dk_gpt_t structure specified by vtoc in preparation for a call to efi_write(). It calculates and initializes the efi_version, efi_lbasize, efi_nparts, efi_first_u_lba, efi_last_lba, and efi_last_u_lba members of this structure. The caller can then set the efi_nparts member.
The efi_alloc_and_read() function allocates memory and returns the partition table.
The efi_free() function frees the memory allocated by efi_alloc_and_init() and efi_alloc_and_read().
The efi_write() function writes the EFI partition table and creates a Protective Master Boot Record (PMBR); see below.
The efi_use_whole_disk() function takes any space that is not contained in the disk label and adds it to the last physically non-zero area before the reserved slice (from slice 0 to slice 6 or unallocated space).
The fd argument refers to any slice on a raw disk, opened with O_NDELAY. See open(2).
The nparts argument specifies the number of desired partitions.
The vtoc argument is a dk_gpt_t structure that describes an EFI partition table and contains at least the following members:
uint_t efi_version; /* set to EFI_VERSION_CURRENT */ uint_t efi_nparts; /* no. of partitions in efi_parts */ uint_t efi_lbasize; /* size of block in bytes */ diskaddr_t efi_last_lba; /* last block on the disk */ diskaddr_t efi_first_u_lba; /* first block after labels */ diskaddr_t efi_last_u_lba; /* last block before backup labels */ struct dk_part efi_parts[]; /* array of partitions */
When a disk receives an EFI label, a protective MBR (PMBR) is also written containing a single partiton of type EEh and spanning the entire disk (up to the limit of what can be represented in an MBR). By default that partition is placed in slot 0 of the PMBR and not marked as active. Some BIOS implementations contain bugs that require the entry to be placed into a different slot or to be made active in order for the system to boot successfully. The default behaviour is modified for systems with known firmware bugs, refer to /usr/share/hwdata/efi.fixes for more information.
Upon successful completion, efi_alloc_and_init() returns 0. Otherwise it returns VT_EIO if an I/O operation to the disk fails.
Upon successful completion, efi_alloc_and_read() returns a positive integer indicating the slice index associated with the open file descriptor. Otherwise, it returns a negative integer to indicate one of the following: VT_EIO
An I/O error occurred.
An unknown error occurred.
An EFI label was not found.
Upon successful completion, efi_write() returns 0. Otherwise, it returns a negative integer to indicate one of the following: VT_EIO
An I/O error occurred.
An unknown error occurred.
The label contains incorrect data.
Upon successfully completion, efi_use_whole_disk() returns 0. Otherwise, it returns a negative integer to indicate one of the following: VT_EIO
An I/O error occurred.
An unknown error occurred.
The label contains incorrect data.
Space out of label was not found.
The EFI label is used on disks with more than 1^32-1 blocks. For compatibility reasons, the read_vtoc(3EXT) and write_vtoc() functions should be used on smaller disks. The application should attempt the read_vtoc() or write_vtoc() call, check for an error of VT_ENOTSUP, then call the analogous EFI function.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE ATTRIBUTE VALUE |
| Interface Stability Committed |
| MT-Level Unsafe |
fmthard(1M), format(1M), prtvtoc(1M), ioctl(2), open(2), libefi(3LIB), read_vtoc(3EXT), attributes(5), dkio(7I)