OPENDISK(3)						   BSD Library Functions Manual 					       OPENDISK(3)

NAME

     opendisk -- open a disk partition

LIBRARY

     System Utilities Library (libutil, -lutil)

SYNOPSIS

     #include <util.h>

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

DESCRIPTION

     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).  iscooked controls which paths in /dev are tried.

     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 path does not contain a slash (``/''), the following variations are attempted:

	   -   If iscooked is zero:

	       /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.).

	   -   If iscooked is non-zero:

	       /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

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

ERRORS

     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

     open(2), getrawpartition(3)

HISTORY

     The opendisk() function first appeared in NetBSD 1.3.

BSD
								 December 11, 2001							       BSD