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OPENDEV(3) Library Functions Manual OPENDEV(3)

opendevshort form device open routine

#include <util.h>

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

The () function opens a device using a “short form” name or disklabel(8) UID (DUID). For instance “sd0” or “sd0c” will be expanded to /dev/rsd0c on most architectures.

Device name lookup is done by first checking path for a ‘/’ and if one is found attempting to open that file. If not, path is checked to see if it is a valid DUID. If it is, the corresponding device is obtained via diskmap(4). If path has no ‘/’ and is not a DUID, /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)

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

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

open(2), getrawpartition(3), diskmap(4), disklabel(8)

The opendev() function first appeared in OpenBSD 1.2.

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

August 26, 2022 OpenBSD-current