read_vtoc(3EXT) 					    Extended Library Functions						   read_vtoc(3EXT)

NAME

       read_vtoc, write_vtoc - read and write a disk's VTOC

SYNOPSIS

       cc [ flag ... ] file ... -ladm [ library ... ]
       #include <sys/vtoc.h>

       int read_vtoc(int fd, struct vtoc *vtoc);

       int write_vtoc(int fd, struct vtoc *vtoc);

DESCRIPTION

       The  read_vtoc()  function  returns the VTOC (volume table of contents) structure that is stored on  the disk associated with the open file
       descriptor fd.

       The write_vtoc() function stores the VTOC structure on the disk associated with the open file descriptor fd.

       The fd argument refers to any slice on a raw disk.

RETURN VALUES

       Upon successful completion, read_vtoc() returns a positive integer indicating the slice index associated with  the  open  file  descriptor.
       Otherwise, it returns a negative integer indicating one of the following errors:

       VT_EIO	       An I/O error occurred.

       VT_ENOTSUP      This operation is not supported on this disk.

       VT_ERROR        An unknown error occurred.

       Upon successful completion, write_vtoc() returns 0. Otherwise, it returns a negative integer indicating one of the following errors:

       VT_EINVAL       The VTOC contains an incorrect field.

       VT_EIO	       An I/O error occurred.

       VT_ENOTSUP      This operation is not supported on this disk.

       VT_ERROR        An unknown error occurred.

ATTRIBUTES

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

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |Unsafe			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       fmthard(1M), format(1M), prtvtoc(1M), ioctl(2), efi_alloc_and_init(3EXT), attributes(5), dkio(7I)

BUGS

       The write_vtoc() function cannot write a  VTOC on an unlabeled disk. Use format(1M) for this purpose.

SunOS 5.10							    25 Jul 2002 						   read_vtoc(3EXT)