Wikipedia

/dev/full

In Linux, FreeBSD, and NetBSD, /dev/full, or the always-full device,[1][2] is a special file that always returns the error code ENOSPC (meaning "No space left on device") on writing, and provides any number of zero bytes to a process that reads from it (similar to /dev/zero).[3] This device is usually used when testing the behavior of a program when it encounters a "disk full" error.

$ echo "Hello, World" > /dev/full
bash: echo: write error: No space left on device

History

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Support for the always-full device in Linux is documented as early as 2007.[2] Native support was added to FreeBSD in the 11.0 release in 2016,[4] which had previously supported it through an optional module called lindev.[4][5] The full device appeared in NetBSD 8.[6]

Relationship to other special files

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Device Read behavior[3] Write behavior[3] Use case
/dev/full Returns zeros Returns ENOSPC Testing disk full errors
/dev/zero Returns zeros Discards data Memory initialization
/dev/null Returns EOF Discards data Suppressing output

See also

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References

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  1. ↑ Aoki, Osamu (November 22, 2010). "Chapter 1. GNU/Linux tutorials". Archived from the original on 2010-06-15. Retrieved November 22, 2010.
  2. 1 2 "Man Page for full (Linux section 4)". November 24, 2007. Retrieved June 1, 2011.{{cite web}}: CS1 maint: deprecated archival service (link)
  3. 1 2 3 Robbins, Kay A.; Robbins, Steven; Robbins, Kay A. (2003). UNIX systems programming: communication, concurrency, and threads. Upper Saddle River, NJ: Prentice Hall PTR. ISBN 978-0-13-042411-2.
  4. 1 2 "FreeBSD 11.0-RELEASE Release Notes". FreeBSD official site. Archived from the original on 11 October 2016. Retrieved 9 March 2019.
  5. ↑ "LINDEV(4) Device Drivers Manual". Debian. Archived from the original on 2021-05-15. Retrieved 2021-05-15.
  6. ↑ "full(4) - NetBSD Manual Pages". NetBSD. Archived from the original on 2021-05-15.


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