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getdiskbyname(3) [osf1 man page]

getdiskbyname(3)					     Library Functions Manual						  getdiskbyname(3)

getdiskbyname, getdiskbyname_r - Get the disk description using a disk name LIBRARY
Standard C Library (libc) SYNOPSIS
#include <sys/disklabel.h> #include <sys/types.h> struct disklabel *getdiskbyname( char *name); int getdiskbyname_r( char *name, struct disklabel *disk, char *boot, int boot_len); PARAMETERS
Specifies a common name for the disk drive whose geometry and partition characteristics are sought. Points to the structure that will con- tain the returned disk description. Points to the buffer that will contain the optional names of the primary and secondary bootstraps. Specifies the length of boot. This should be BUFSIZ. DESCRIPTION
Operations supported by the getdiskbyname function are also supported by the createlabel function. See The getdiskbyname and getdiskby- name_r functions are supported only for backward compatibility with DIGITAL UNIX Version 4.0 and earlier versions. These functions will be retired in a future release of Tru64 UNIX. The getdiskbyname() function uses a disk (disk drive) name to return a pointer to a structure that describes the geometry and standard par- tition characteristics of the named disk drive. Information obtained from the /etc/disktab database file is written to the type disklabel structure space referenced by the returned pointer. The getdiskbyname_r() function is the reentrant version of getdiskbyname(). Upon successful completion, getdiskbyname_r() returns a value of 0 (zero); the returned structure is pointed at by disk. Upon error, it returns a value of -1, and may set errno to [EINVAL]. RETURN VALUES
Upon successful completion, the getdiskbyname() function, returns a pointer to a type disklabel structure. ERRORS
Either disk or boot is NULL, or boot_len is not equal to BUFSIZ. RELATED INFORMATION
Functions: createlabel(3) Files: disklabel(4), disktab(4) Commands: disklabel(8) delim off getdiskbyname(3)

Check Out this Related Man Page

NEWFS(8)						      System Manager's Manual							  NEWFS(8)

newfs - construct a new file system SYNOPSIS
/sbin/newfs [ -N ] [ -m free-gap ] [ -n free-modulus ] [ -i bytes ] [ -s size ] [ -T disk-type ] special DESCRIPTION
Newfs is a ``friendly'' front-end to the mkfs(8) program. Newfs(8) will normally read the disklabel from the drive to determine the parti- tion sizes. If the driver for the disk does not support disklabels the -T option must be used to force a search of /etc/disktab for parti- tion information about drive-type. Newfs calculates the appropriate parameters to use in calling mkfs, then builds the file system by forking mkfs. -N causes the mkfs command which would be executed to be printed out without actually creating the file system. The disk specified by spe- cial must be online though so that newfs can read the disklabel. -m allows the specification of the block interleaving of the free list. If not specified or outside the range 1 thru 32 then a value of 2 is used. -n parameter is the freelist modulus (when the -m pattern repeats) and is calculated by newfs to be 1 cylinder in size by default. -i specifies how many bytes per inode to assume when calculating how many inodes to allocate. The default is 4096 bytes per inode. If this results in too few inodes being allocated (there is an absolute maximum of 65500) then decrease the bytes number (which must lie between 512 and 65536). -T must be used if the disk specified by special has not been labeled with the disklabel(8) program. In this case disk-type is used by getdisklabel(3) when searching /etc/disktab. This option is used when the underlying device driver does not support disklabels. Care must be taken that the contents of /etc/disktab match the partition tables in the kernel. -s specifies how many sectors the file system is to contain. There are two sectors per file system block, therefore size should be even. This parameter must be less than or equal to the partition size (as determined from the disklabel or /etc/disktab). An error is printed and no action is taken if the partition size is 0 or too large. NOTE: Mkfs deals in units of filesystem blocks not sectors. Newfs uses sectors. FILES
/etc/disktab disk geometry and partition information mkfs to actually build the file system SEE ALSO
getdisklabel(3), disklabel(8), disktab(5), diskpart(8), fs(5), fsck(8), mkfs(8) BUGS
newfs(8) no longer places boot blocks on the filesystem. That duty has been moved to the disklabel(8) program. If you must place a boot block on a disk whose driver does not support disklabels use dd(1). 4.2 Berkeley Distribution April 12, 1996 NEWFS(8)

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