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| author | Pádraig Brady <P@draigBrady.com> | 2011-02-22 21:14:00 +0000 |
|---|---|---|
| committer | Pádraig Brady <P@draigBrady.com> | 2011-03-05 02:33:53 +0000 |
| commit | 5f3115535b32a9c0cc5aee5cf5b4001f684ad56e (patch) | |
| tree | 601be66ec898ecbd0276d7258191c5468c775a6b /cfg.mk | |
| parent | 433a7c614f0fbce3ba3346409af847d82670d284 (diff) | |
| download | coreutils-5f3115535b32a9c0cc5aee5cf5b4001f684ad56e.tar.xz | |
dd: add a flag to discard cached data
* src/dd.c (FFS_MASK): A new macro (Find First Set) refactored
from the following enum as it's now used twice.
(usage): Mention the new 'nocache' flag.
(cache_round): A new function to help ignore requests
to drop cache, that are less than page_size.
(invalidate_cache): A new function to call posix_fadvise()
with the appropriate offset and length. Note we don't
use fdadvise() so we can detect errors when count=0.
(dd_copy): Call invalidate_cache() for the portions read.
(iwrite): Likewise for the portions written.
(main): Call invalidate_cache for page_size slop or
for full file when count=0.
* cfg.mk (sc_dd_O_FLAGS): Adjust to pass.
* doc/coreutils.texi (dd invocation): Describe the 'nocache' flag,
and give some examples of how it can be used.
* tests/dd/nocache: A new test.
* tests/Makefile.am: Reference the new test.
* NEWS: Mention the new feature.
Diffstat (limited to 'cfg.mk')
| -rw-r--r-- | cfg.mk | 4 |
1 files changed, 2 insertions, 2 deletions
@@ -39,8 +39,8 @@ _hv_file ?= $(srcdir)/tests/misc/help-version dd = $(srcdir)/src/dd.c sc_dd_O_FLAGS: @rm -f $@.1 $@.2 - @{ echo O_FULLBLOCK; perl -nle '/^ +\| (O_\w*)$$/ and print $$1' \ - $(dd); } | sort > $@.1 + @{ echo O_FULLBLOCK; echo O_NOCACHE; \ + perl -nle '/^ +\| (O_\w*)$$/ and print $$1' $(dd); } | sort > $@.1 @{ echo O_NOFOLLOW; perl -nle '/{"[a-z]+",\s*(O_\w+)},/ and print $$1' \ $(dd); } | sort > $@.2 @diff -u $@.1 $@.2 || diff=1 || diff=; \ |