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The /dev filesystem contains files that allow programs to access the devices themselves: write data to a serial port, read a hard disk, etc. It's of interest to applications that access devices. A metaphor is that /sys provides access to the packaging, while /dev provides access to the content of the box.
devfsd is a device manager for the Linux kernel. Primarily, it creates device nodes in the /dev directory when kernel drivers make the underlying hardware accessible. The nodes exist in a virtual device file system named devfs.
They provide various functions handled by the operating system. Some of the most commonly used (character-based) pseudo-devices include: /dev/null – accepts and discards all input written to it; provides an end-of-file indication when read from.
tmpfs - The Temporary filesystem is a virtual filesystem for storing temporary files. This filesystem is really in the memory and/or in the swap space. Obviously, all data on this filesystem are lost when the system is shutdown. The mount point is /tmp/. devtmpfs - This is an improved devfs.
I read about devfs(known as device file system ) to facilitate device driver programming as mentioned in linux device drivers text . How different is devfs from /dev directory in linux.Are they both same ?, i'm quite confused .
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