05-30-2008
The very first thing to understand is that these files are NOT the drivers for the devices. Drivers are in the kernel itself (/unix or /xenix or /stand/unix), and the files in /dev do not actually contain anything at all: they are just pointers to where the driver code can be found in the kernel. There is nothing more to it than that. These aren't programs, they aren't drivers, they are just pointers.
That also means that if the device file points at code that isn't in the kernel, it obviously is not going to work. Existence of a device file does not necessarily mean that the device code is in the kernel, and creating a device file (with mknod) does NOT create kernel code.
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mknod(1M) System Administration Commands mknod(1M)
NAME
mknod - make a special file
SYNOPSIS
mknod name b major minor
mknod name c major minor
mknod name p
DESCRIPTION
mknod makes a directory entry for a special file.
OPTIONS
The following options are supported:
b Create a block-type special file.
c Create a character-type special file.
p Create a FIFO (named pipe).
OPERANDS
The following operands are supported:
major The major device number.
minor The minor device number; can be either decimal or octal. The assignment of major device numbers is specific to each system. You
must be the super-user to use this form of the command.
name A special file to be created.
USAGE
See largefile(5) for the description of the behavior of mknod when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
ftp(1), in.ftpd(1M), mknod(2), symlink(2), attributes(5), largefile(5)
NOTES
If mknod(2) is used to create a device, the major and minor device numbers are always interpreted by the kernel running on that machine.
With the advent of physical device naming, it would be preferable to create a symbolic link to the physical name of the device (in the
/devices subtree) rather than using mknod.
SunOS 5.10 16 Sep 1996 mknod(1M)