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Command: createlabel | Section: 3 | Source: Digital UNIX | File: createlabel.3.gz
createlabel(3) Library Functions Manual createlabel(3)
NAME
createlabel - Creates a disk label structure for a disk device
LIBRARY
Standard C Library (libc.a)
SYNOPSIS
#include <sys/types.h>
#include <sys/disklabel.h>
int createlabel( char *devname, char *name, struct
disklabel *disk, char *boot, int boot_len);
PARAMETERS
Specifies the device special file name of the device. Specifies the
name entry in the /etc/disktab file that is to be used for the label
information. Otherwise, specify NULL to indicate that the name entry
either is not in the /etc/disktab file, or, if it is, that it should be
ignored. Points to the disk label structure that is filled in with the
returned disk description on successful completion of the function.
Points to the buffer that the function may use to contain the (op-
tional) primary and secondary bootstrap names for the disk label.
Specifies the length of the boot buffer. The value must be set to the
value of the BUFSIZ constant.
DESCRIPTION
The function fills in the disk label structure pointed to by the disk
parameter. The resulting disk label can then be written to the disk in
order to label it.
The function queries the device, using the devname parameter, to obtain
the disk's geometry, capacity, and any default partition information.
The function checks the name parameter. If name is non-null, the func-
tion looks for an entry in the /etc/disktab file that matches the name
string and initializes the disk label structure from that entry. The
function then overrides the device data and initializes the disk label
structure from the entry in the /etc/disktab file.
If the name string is NULL, or has no matching entry in the /etc/disk-
tab file, the function queries the device (using the devname parameter)
to obtain the device's name string. The function then looks for an en-
try in the /etc/disktab file that matches that name string, and if it
finds a match, initializes the disk label structure from that entry.
If an /etc/disktab entry indicates that the device has a dynamic geome-
try, the function queries the device (using the devname parameter) to
obtain the disk's true geometry and capacity and to override any value
given in an /etc/disktab entry associated with the device. In this
case, any -1 lengths encountered in the partition specifications for
the entry are replaced by a value equal to the device's total capacity
minus the starting offset of the partition.
RETURN VALUES
Upon successful completion of the createlabel function, a value of 0 is
returned and the contents of the disk label structure are updated.
Upon error, a value of -1 is returned and errno is set to [EINVAL].
ERRORS
Either disk or boot is NULL, or boot_len is not equal to BUFSIZ.
FILES
Table of disk partition sizes for supported disks.
RELATED INFORMATION
Commands: disklabel(8)
Functions: getdiskbyname(3).
Files: disklabel(4), disktab(4) delim off
createlabel(3)