NAME

opendev — short form device open routine

SYNOPSIS

#include <util.h>

int
opendev(char *path, int oflags, int dflags, char **realpath);

DESCRIPTION

The opendev() function opens a device using the “short form” name. This is typically “disk0s3”, for instance, which will be expanded to /dev/rdisk0s3 on most architectures.

Device name lookup is done by first checking path for a “/” and if one is found attempting to open that file. Otherwise /dev is searched for a matching device.

The oflags are the same as the flags passed to open(2).

The dflags are specified by OR'ing the following values:

OPENDEV_PART	attempt to open the raw partition during expansion
OPENDEV_BLCK	open the block device (default is character device)

The “raw” partition is defined as the partition which provides access to the entire disk, regardless of the disk's partition map.

If realpath is not NULL, it is modified to point at the fully expanded device name.

RETURN VALUES

The opendev() return value and errors are the same as the return value and errors of open(2).

WARNINGS

If realpath is not NULL, on return it will point to internal static storage space that will be overwritten by subsequent calls.

SEE ALSO

open(2)

HISTORY

The opendev() function first appeared in OpenBSD 1.2.