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Device Information: /proc and /etc/sysconfig/hwconf
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On Red Hat, Kudzu maintains a complete profile of all your installed hardware devices in the /etc/sysconfig/ hwconf file (/etc/sysconfig is discussed in 1). As noted previously, this file is updated by Kudzu (kudzu); your new hardware is added and old ones removed. Entries define configuration variables such as the device s class (video, CD-ROM, hard drive, and so on), the bus it uses (PCI, IDE, and so on), its device name (such as hdd or st0), the drivers it uses, and a description of the device. A mouse entry is shown here: class: MOUSE bus: PSAUX detached: 0 device: psaux driver: generic3ps/2 desc: "Generic 3 Button Mouse (PS/2)" The /proc file system (see 4) maintains special information files for your devices. The /proc/devices file lists all your installed character and block devices along with their major numbers. IRQs, DMAs, and I/O ports currently used for devices are listed in the interrupts, dma, and ioports files, respectively. Certain files list information covering several devices, such as pci, which lists all your PCI devices, and sound, which lists all your sound devices. The sound file lists detailed information about your sound card. Several subdirectories, such as net, ide, and scsi, contain information files for different devices. Certain files hold configuration information that can be changed dynamically, like the IP packet forwarding
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File /proc/devices /proc/dma /proc/interrupts /proc/ioports /proc/pci /proc/sound /proc/scsi /proc/ide
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Description Lists the device drivers configured for the currently running kernel Displays the DMA channels currently used Displays the IRQs (interrupts) in use Shows the I/O ports in use Lists PCI devices Lists sound devices Directory for SCSI devices Directory for IDE devices
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/proc/net Directory for network devices Table 7-2. Proc Device Information Files
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capability and the maximum number of files. You can change these values with the redhat-config-proc tool (Kernel Tuning in the System Tools menu) or by manually editing certain files. Table 7-2 lists several device-related /proc files (see 4 for other entries).
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In Linux, several users may be logged in at the same time. Each user needs his or her own terminal through which to access the Linux system, of course. The monitor on your PC acts as a special terminal, called the console, but you can add other terminals either through the serial ports on your PC or a special multiport card installed on your PC. The other terminals can be standalone terminals or PCs using terminal emulation programs. For a detailed explanation of terminal installation, see the Term-HOWTO file in /usr/share/doc/HOWTO (installed as part of Red Hat documentation CD-ROM) or at the Linux Documentation Project site (www.tldp.org). A brief explanation is provided here.
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194 Red Hat Linux Pocket Administrator
Serial Ports
The serial ports on your PC are referred to as COM1, COM2, COM3, and COM4. These serial ports correspond to the terminal devices /dev/ttyS0 through /dev/ttyS3. Note that several of these serial devices may already be used for other input devices such as your mouse, and for communications devices such as your modem. If you have a serial printer, one of these serial devices is already used for that. If you installed a multiport card, you have many more ports from which to choose. For each terminal you add, you must create a character device on your Linux system. As with printers, you use the mknod command to create terminal devices. The permissions for a terminal device are 660. Terminal devices are character devices with a major number of 4 and minor numbers usually beginning at 64.
TIP The /dev/pts entry in the /etc/fstab file mount a devpts file system at /dev/pts for Unix98 Psuedo-TTYs. These pseudo terminals are identified by devices named by number.
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