getdiskbyname.3x

<B>Digital的Unix操作系统VAX 4.2源码</B>

.\" SCCSID: @(#)getdiskbyname.3x	6.2	8/30/89
.TH getdiskbyname 3x
.SH Name
getdiskbyname \- get disk description by its name
.SH Syntax
.nf
.B #include <disktab.h>
.PP
.B struct disktab *
.B getdiskbyname(name)
.B char *name;
.fi
.SH Description
.NXR "getdiskbyname subroutine"
.NXR "disk" "getting description"
The
.PN getdiskbyname
subroutine
takes a disk name (for example, RM03) and returns a structure
describing its geometry information and the standard
disk partition tables.  All information obtained from
the 
.MS disktab 5
file.
A separate subroutine called 
.PN creatediskbyname 
dynamically generates
disktab entries by obtaining disk geometry information from the controlling
device driver.
.PP
<disktab.h>
has the following form:
.EX 0
#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();
.EE
.SH See Also
creatediskbyname(3x), disktab(5)