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Chapter 2. The /proc File System 27

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 a kind of "personality" of a particular operating system. Other binary

formats, such as Solaris, UnixWare, and FreeBSD, can be used with Linux. By changing the per-

sonality of a task running in Linux, a programmer can change the way the operating system treats

particular system calls from a certain binary. Except for the PER_LINUX execution domain, they 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 that 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

The ﬁrst column signiﬁes whether the ﬁle system is mounted on a block device. Those beginning with

nodev are not mounted on a device. The second column lists the name of the ﬁle systems supported.

The mount command cycles through these ﬁle systems when one is not speciﬁed as an argument.

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Red Hat LINUX 7.2 - OFFICIAL LINUX CUSTOMIZATION GUIDE Guida di Installazione Pagina 27