Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Scaricare il pdf (Pagina 39)

Chapter 2. The /proc File System 39

PPid: 723

TracerPid: 0

Uid: 0 0 0 0

Gid: 0 0 0 0

FDSize: 32

Groups:

VmSize: 3596 kB

VmLck: 0 kB

VmRSS: 288 kB

VmData: 552 kB

VmStk: 28 kB

VmExe: 224 kB

VmLib: 2596 kB

SigPnd: 0000000000000000

SigBlk: 0000000000000000

SigIgn: 8000000000001000

SigCgt: 0000000000012000

CapInh: 0000000000000000

CapPrm: 00000000fffffeff

CapEff: 00000000fffffeff

Other than the process’s name and ID, the state (such as S (sleeping) or R (running) and

user/group ID running the process is available, as well as much more detailed data regarding mem-

ory usage.

2.3.1.1. /proc/self/

The /proc/self/ directory is a link to the currently running process. This allows a process to look

at itself without having to know its process ID.

Within a shell environment, a listing of the /proc/self/ directory produces the same contents as

listing the process directory for that process.

2.3.2. /proc/bus/

This directory contains information speciﬁc to the various buses available on the system. So, for

example, on a standard system containing ISA, PCI, and USB busses, current data on each of these

buses is available in its directory under /proc/bus/.

The contents of the subdirectories and ﬁles available varies greatly on the precise conﬁguration of

your system. However, each of the directories for each of the bus types has at least one directory for

each bus of that type. These individual bus directories, usually signiﬁed with numbers, such as 00,

contains binary ﬁles that refer to the various devices available on that bus.

So, for example, a system with a USB bus but no USB devices connected to it has a /proc/bus/usb

directory containing several ﬁles:

total 0

dr-xr-xr-x 1 root root 0 May 3 16:25 001

-r--r--r-- 1 root root 0 May 3 16:25 devices

-r--r--r-- 1 root root 0 May 3 16:25 drivers

[root@thoth /]# ls -l /proc/bus/usb/001

total 1

-rw-r--r-- 1 root root 18 May 3 16:25 001

The /proc/bus/usb directory contains ﬁles that track the various devices on any USB buses, as well

as the drivers required to utilize them. The 001 directory contains all devices on the ﬁrst USB bus. By

looking at the contents of the devices ﬁle, we can see that it is the USB root hub on the motherboard:

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 281 282

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 39

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