Chapter 2. The

proc

File System

27

The other difference is that block devices can send and receive information in blocks of a size config 

ured per device. Character devices send data with no preconfigured size.

For more information about devices see

/usr/src/linux 2.4/Documentation/devices.txt

.

2.2.5.

/proc/dma

This file contains a list of the registered ISA direct memory access (DMA) channels in use. A sample

/proc/dma

files looks like this:

4: cascade

2.2.6.

/proc/execdomains

This file lists the execution domains currently supported by the Linux kernel, along with the range of

personalities they support.

0 0

Linux

[kernel]

Think of execution domains as the "personality" for a particular operating system. Because other

binary formats, such as Solaris, UnixWare, and FreeBSD, can be used with Linux, programmers can

change the way the operating system treats particular system calls from these binaries by changing

the personality of the task. Except for the

PER_LINUX

execution domain, different personalities can

be implemented as dynamically loadable modules.

2.2.7.

/proc/fb

This file contains a list of frame buffer devices, with the frame buffer device number and the driver

that controls it. Typical output of

/proc/fb

for systems which contain frame buffer devices looks

similar to this:

0 VESA VGA

2.2.8.

/proc/filesystems

This file displays a list of the file system types currently supported by the kernel. Sample output from

a generic kernel's

/proc/filesystems

file looks similar to this:

nodev rootfs

nodev bdev

nodev proc

nodev sockfs

nodev tmpfs

nodev shm

nodev pipefs

ext2

nodev ramfs

iso9660

nodev devpts

ext3

nodev autofs

nodev binfmt_misc