NAME    [Toc]    [Back]

     opendisk - open a disk's ``raw'' partition

LIBRARY SYNOPSIS    [Toc]    [Back]

     #include <sys/types.h>
     #include <util.h>

     int
     opendisk(const char *path,  int  flags,  char  *buf,  size_t
buflen,
             int iscooked);

DESCRIPTION    [Toc]    [Back]

     opendisk()  opens path, for reading and/or writing as specified by the argument
 flags using open(2), and the file descriptor  is  returned to the
     caller.   buf  is  used  to  store  the  resultant filename.
buflen is the
     size, in bytes, of the array referenced by buf (usually MAXPATHLEN
     bytes).   If  iscooked is non zero, the ``cooked'' partition
(block device)
     is opened, rather than the ``raw'' partition (character  device).

     opendisk()  attempts  to  open  the  following variations of
path, in order:

     path         The pathname as given.

     pathX        path with a suffix of `X', where `X' represents
the raw partition
  of the device, as determined by getrawpartition(3),
                  usually ``c''.

     If iscooked is zero, then the following two  variations  are
attempted:

     /dev/rpath   path with a prefix of ``/dev/r''.

     /dev/rpathX   path  with a prefix of ``/dev/r'' and a suffix
of `X' (q.v.).

     Otherwise (i.e., iscooked is non-zero), the following variations are attempted:


     /dev/path    path with a prefix of ``/dev/''.

     /dev/pathX   path with a prefix of ``/dev/'' and a suffix of
`X' (q.v.).

RETURN VALUES    [Toc]    [Back]

     An open file descriptor, or -1 if the open(2) failed.

ERRORS    [Toc]    [Back]

     opendisk() may set errno to one of the following values:

     [EINVAL]      O_CREAT was  set  in  flags,  or  getrawpartition(3) didn't return
 a valid partition.

     [EFAULT]      buf was the NULL pointer.

     The  opendisk()  function  may  also  set errno to any value
specified by the
     open(2) function.

SEE ALSO    [Toc]    [Back]

     open(2), getrawpartition(3)

HISTORY    [Toc]    [Back]

     The opendisk() function first appeared in NetBSD 1.3.

OpenBSD     3.6                       September     22,      1997