ultrix man page for creatediskbyname

creatediskbyname(3x)													      creatediskbyname(3x)

Name
       creatediskbyname - get the disk description associated with a file name

Syntax
       #include <disktab.h>

       struct disktab *
       creatediskbyname(name)
       char *name;

Description
       The subroutine takes the name of the character device special file representing a disk device (for example, and returns a structure pointer
       describing its geometry information and the default disk partition tables.  It obtains this information by  polling  the  controlling  disk
       device driver.  The subroutine returns information only for MSCP and SCSI disks.

       The file has the following form:
       #define DISKTAB	      "/etc/disktab"

       struct  disktab {
	     char   *d_name;	      /* drive name */
	     char   *d_type;	      /* drive type */
	     int    d_secsize;	      /* sector size in bytes */
	     int    d_ntracks;	      /* # tracks/cylinder */
	     int    d_nsectors;       /* # sectors/track */
	     int    d_ncylinders;     /* # cylinders */
	     int    d_rpm;	      /* revolutions/minute */
	     struct partition {
		     int     p_size;   /* #sectors in partition */
		     short   p_bsize;  /* block size in bytes */
		     short   p_fsize;  /* frag size in bytes */
	       } d_partitions[8];
       };

       struct  disktab *getdiskbyname();
       struct  disktab *creatediskbyname();

Diagnostics
       Successful completion of the subroutine returns a pointer to a valid disktab structure.	Failure of this subroutine returns a null pointer.
       The subroutine fails if it cannot obtain the necessary information from the device driver or disktab file.

       A check is done to ensure that the disktab file exists and is readable.	This check ensures that the subroutine is not being called because
       the disktab file was accidentally removed.  If there is no disktab file, the subroutine fails.

       The subroutine also fails if it cannot determine disk geometry attributes by polling the driver.  This can occur if the disk is not an MSCP
       or SCSI disk.  In some cases where the disk consists of removable media and the media is not loaded, the driver will be unable to determine
       disk attributes.

Restrictions
       The subroutine returns information only for MSCP and SCSI disks.

See Also
       getdiskbyname(3x), ra(4), rz(4), disktab(5)

															      creatediskbyname(3x)