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Device Files
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The name of a device file is designed to reflect the task of the device. Printer device files begin with lp for line
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188 Red Hat Linux Pocket Administrator
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print. Because you could have more than one printer connected to your system, the particular printer device files are distinguished by two or more numbers or letters following the prefix lp, such as lp0, lp1, lp2. The same is true for terminal device files. They begin with the prefix tty, for teletype, and are further distinguished by numbers or letters such as tty0, tty1, ttyS0, and so on. You can obtain a complete listing of the current device filenames and the devices for which they are used from the kernel.org web site at http://www.kernel.org/pub/ linux/docs/device-list/devices.txt.
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All of these filenames will be implemented as device files in your /dev directory. Here, you can find printer, CD-ROM, hard drive, SCSI, and sound device files, along with many others. Certain files are really symbolic links that bear common device names that are often linked to the actual device file used. A symbolic link is used as another name for a file, linking you to that file. For example, a /dev/cdrom symbolic link links to the actual device file used for your CD-ROM. If your CD-ROM is an IDE device, it may use the device file hdc. In this case, /dev/cdrom would be a link to /dev/hdc. In effect, /dev/cdrom is another name for /dev/hdc. A /dev/modem link file also exists for your modem. If your modem is connected to the second serial port, its device file would be /dev/ttyS1. In this case, /dev/modem would be a link to that device file. Applications can then use /dev/modem to access your modem, instead of having to know the actual device file used. A listing of commonly used device links is shown in Table 7-1.
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TIP You will notice that there are no entries for the Ethernet devices in the /dev file, such as eth0 or eth1. That is because these are really aliases for kernel modules defined in the /etc/modules.conf file, or devices handled by the kernel directly. They are not device files.
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Link /dev/mouse /dev/tape /dev/cdrom /dev/cdwriter /dev/scanner /dev/modem /dev/root
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Description Current mouse device Current tape device Current CD-ROM device Current CD-writer device Current scanner device Current dial-out device, modem port Current root file system
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/dev/swap Current swap device Table 7-1. Device Links
Hardware Device Installation: Kudzu
Hardware devices are automatically detected by the Red Hat hardware probing tool known as Kudzu. Kudzu is a tool that detects and configures new or changed hardware on a system. Kudzu is run when you boot to configure new hardware devices and detect removed ones. You can also run Kudzu manually. When you start Kudzu, it detects the current hardware, and checks it against a database stored in /etc/sysconfig/hwconf. It then determines if any hardware has been added to or removed from the system. When it detects new or added hardware, Kudzu will, if needed, invoke the appropriate configuration tool for the device, like redhat-configxfree86 for video cards, or redhat-config-keyboard for keyboards. For simple hardware configurations like CD-ROMs, Kudzu just links the cdrom device symbolic link to the new device, /dev/cdrom. Kudzu then updates its database in /etc/sysconfig/ hwconf. If a removed device is detected, the hwconf file is updated accordingly. If the device was installed simply with a device link like /dev/cdrom or /dev/mouse, that link is removed. In the case of network cards, alias entries like that for eth0 will be removed.
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190 Red Hat Linux Pocket Administrator
Creating Device Files Manually
Linux implements two types of devices: block and character. A block device, such as a hard disk, transmits data a block at a time. A character device, such as a printer or modem, transmits data one character at a time, or rather as a continuous stream of data, not as separate blocks. Device driver files for character devices have a c as the first character in the permissions segment displayed by the ls command. Device driver files for block devices have a b. In the next example, lp0 (the printer) is a character device and hda1 (the hard disk) is a block device: # ls -l hda1 lp0 brw-rw---- 1 root disk 3, 1 Jan 30 02:04 hda1 crw-rw---- 1 root lp 6, 0 Jan 30 02:04 lp0
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