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The device type can be either b, c, p, or u. As already mentioned, the b indicates a block device, and c is for a character device. The u is for an unbuffered character device, and the p is for a FIFO (First In First Out) device. Devices of the same type often have the same name, for example, serial interfaces all have the name: ttyS. Devices of the same type are then uniquely identified by a number attached to the name. This number has two components: the major number and the minor number. Devices may have the same major number, but if so, the minor number is always different. This major and minor structure is designed to deal with situations in which several devices may be dependent on one larger device, such as several modems connected to the same I/O card. All the modems would have the same major number that references the card, but each modem would have a unique minor number. Both the minor and major numbers are required for block and character devices (b, c, and u). They are not used for FIFO devices, however. Valid device names along with their major and minor numbers are listed in the devices.txt file located in the /Documentation directory for the kernel source code,
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/usr/src/linux-ver/Documentation. When you create a device, you use the major and minor numbers as well as the device name prefix for the particular kind of device you are creating. Most of these devices are already created for you, and are listed in the /etc/dev directory.
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Although most distributions include an extensive set of device files already set up for you, you can create your own. You use the mknod command to create a device file, either a character or block type. The mknod command has the following syntax:
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mknod options device device-type major-num minor-num
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For example, Linux systems usually provide device files for three parallel ports (lp0 2). If you need more, you can use the mknod command to create a new one. Printer devices are character devices, and must be owned by the root and daemon. The permissions for printer devices are read and write for the owner and the group, 660 (see 2 for a discussion of file permissions). The major device number is set to 6, while the minor device number is set to the port number of the printer, such as 0 for LPT1 and 1 for LPT2. Once the device is created, you use chown to change its ownership to the root user, since only the administrator should control it. Change the group to lp with the chgrp command. Most devices belong to their own groups, such as disks for hard disk partitions, lp for printers, and floppy for floppy disks, and tty for terminals. In the next example, a parallel printer device is made on a fourth parallel port, /dev/lp3. The -m option specifies the permissions in this case, 660. The device is a character device, as indicated by the c argument following the device name. The major number is 6, and the minor number is 3. If you were making a device at /dev/lp4, the major number would still be 6, but the minor number would be 4. Once the device is made, the chown command then changes the ownership of the parallel printer device to root. For printers, be sure that a spool directory has been created for your device. If not, you need to make one. Spool directories contain files for
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data that varies according to the device output or input, like printers or scanners. # mknod -m 660 /dev/lp3 c 6 3 # chown root /dev/lp3 # chgrp lp /dev/lp3
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