efi_alloc_and_init(3EXT) Extended Library Functions efi_alloc_and_init(3EXT)NAME
efi_alloc_and_init, efi_alloc_and_read, efi_free, efi_write - manipu‐
late a disk's EFI Partition Table
SYNOPSIS
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);
DESCRIPTION
The efi_alloc_and_init() function initializes the dk_gpt_t structure
specified by vtoc in preparation for a call to efi_write(). It calcu‐
lates and initializes the efi_version, efi_lbasize, efi_nparts,
efi_first_u_lba, efi_last_lba, and efi_last_u_lba members of this
sturcture. The caller can then set the efi_nparts member.
The efi_alloc_and_read() function allocates memory and returns the par‐
tition 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.
The fd argument refers to any slice on a raw disk, opened with O_NDE‐
LAY. 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 parti‐
tion table and contains at least the following members:
uint_t efi_version; /* set to EFI_VERSION_CURRENT */
uint_t efi_nparts; /* number 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 */
RETURN VALUES
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.
VT_ERROR An unknown error occurred.
VT_EINVAL 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.
VT_ERROR An unknown error occurred.
VT_EINVAL The label contains incorrect data.
USAGE
The EFI label is used on disks with more than 1**32-1 blocks. For com‐
patibility 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.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
┌─────────────────────────────┬─────────────────────────────┐
│ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
├─────────────────────────────┼─────────────────────────────┤
│Interface Stability │Evolving │
├─────────────────────────────┼─────────────────────────────┤
│MT-Level │Unsafe │
└─────────────────────────────┴─────────────────────────────┘
SEE ALSOfmthard(1M), format(1M), prtvtoc(1M), ioctl(2), open(2), libefi(3LIB),
read_vtoc(3EXT), attributes(5), dkio(7I)SunOS 5.10 23 Jul 2002 efi_alloc_and_init(3EXT)
