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 -  manipulate 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 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.

       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;	/* 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 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.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fmthard(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)