Section (4) null
null, zero — data sink
Data written to the
/dev/zero special files is discarded.
return end of file (i.e., read(2) returns 0), whereas
return bytes containing zero (_zsingle_quotesz_ _zsingle_quotesz_ characters).
These devices are typically created by:
mknod −m 666 /dev/null c 1 3 mknod −m 666 /dev/zero c 1 5 chown root:root /dev/null /dev/zero
If these devices are not writable and readable for all users, many programs will act strangely.
Since Linux 2.6.31, reads from
/dev/zero are interruptible by signals.
(This change was made to help with bad latencies for large
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and the latest version of this page, can be found at
Copyright (c) 1993 Michael Haardt (michaelmoria.de),
Fri Apr 2 11:32:09 MET DST 1993
This is free documentation; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
The GNU General Public License_zsingle_quotesz_s references to object code
and executables are to be interpreted as the output of any
document formatting or typesetting system, including
intermediate and printed output.
This manual is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public
License along with this manual; if not, see
Modified Sat Jul 24 17:00:12 1993 by Rik Faith (faithcs.unc.edu)