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NetBSD 6.1.5 - man page for opendisk (netbsd section 3)

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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 resul-
     tant 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
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