OPENDISK(3) BSD Programmer's Manual OPENDISK(3)NAMEopendisk - open a disk's "raw" partition
LIBRARY
libutil
SYNOPSIS
#include <sys/types.h>
#include <util.h>
int
opendisk(const char *path, int flags, char *buf, size_t buflen,
int iscooked);
DESCRIPTIONopendisk() opens path, for reading and/or writing as specified by the ar-
gument 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 par-
tition 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 at-
tempted:
/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.
ERRORSopendisk() may set errno to one of the following values:
[EINVAL] O_CREAT was set in flags, or getrawpartition(3) didn't re-
turn 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 ALSOopen(2), getrawpartition(3)HISTORY
The opendisk() function first appeared in NetBSD 1.3.
MirOS BSD #10-current September 22, 1997 1
