| D.1. Linux Devices | ||
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Tillegg D. Random Bits | 
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| D.1. Linux Devices | ||
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Tillegg D. Random Bits |
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In Linux various special files can be found under the directory /dev. These files are called device files and behave unlike ordinary files. The most common types of device files are for block devices and character devices. These files are an interface to the actual driver (part of the Linux kernel) which in turn accesses the hardware. Another, less common, type of device file is the named pipe. The most important device files are listed in the tables below.
sda |
First hard disk |
sdb |
Second hard disk |
sda1 |
First partition of the first hard disk |
sdb7 |
Seventh partition of the second hard disk |
sr0 |
First CD-ROM |
sr1 |
Second CD-ROM |
ttyS0 |
Serial port 0, also referred to as COM1 |
ttyS1 |
Serial port 1, also referred to as COM2 |
psaux |
PS/2 mouse device |
gpmdata |
Pseudo device, repeater data from GPM (mouse) daemon |
cdrom |
Symbolic link to the CD-ROM drive |
mouse |
Symbolic link to the mouse device file |
null |
Anything written to this device will disappear |
zero |
One can endlessly read zeros out of this device |
The mouse can be used in both the Linux console (with gpm) and the X window environment. Normally, this is a simple matter of installing gpm and the X server itself. Both should be configured to use /dev/input/mice as the mouse device. The correct mouse protocol is named exps2 in gpm, and ExplorerPS/2 in X. The respective configuration files are /etc/gpm.conf and /etc/X11/xorg.conf.
Certain kernel modules must be loaded in order for your mouse to work. In most cases the correct modules are autodetected, but not always for old-style serial and bus mice[21], which are quite rare except on very old computers. Summary of Linux kernel modules needed for different mouse types:
| Module | Description |
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| psmouse | PS/2 mice (should be autodetected) |
| usbhid | USB mice (should be autodetected) |
| sermouse | Most serial mice |
| logibm | Bus mouse connected to Logitech adapter card |
| inport | Bus mouse connected to ATI or Microsoft InPort card |
To load a mouse driver module, you can use the modconf command (from the package with the same name) and look in the category kernel/drivers/input/mouse.
[21] Serial mice usually have a 9-hole D-shaped connector; bus mice have an 8-pin round connector, not to be confused with the 6-pin round connector of a PS/2 mouse or the 4-pin round connector of an ADB mouse.
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| Tillegg D. Random Bits |  |
D.2. Disk Space Needed for Tasks |