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/dev/full

From Quire, the open reference·Device file in Unix-like operating systems·1 min read

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#edit

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#edit

DeviceRead behavior[3]Write behavior[3]Use case
/dev/fullReturns zerosReturns ENOSPCTesting disk full errors
/dev/zeroReturns zerosDiscards dataMemory initialization
/dev/nullReturns EOFDiscards dataSuppressing output

See also#edit

References#edit

  1. ^ Aoki, Osamu (November 22, 2010). "Chapter 1. GNU/Linux tutorials". Archived from the original on 2010-06-15. Retrieved November 22, 2010.
  2. ^ a b "Man Page for full (Linux section 4)". November 24, 2007. Retrieved June 1, 2011.
  3. ^ a b c 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. ^ a b "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.


Categories Device fileSoftware testingUnix file system technologyLinux stubs

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