GNU bug report logs - #19995
doc: Adds a bug section to sync.1 page to draw attention to unexpected behavior allowed by POSIX.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: saulery <at> free.fr
To: bug-coreutils <at> gnu.org
Cc: Stéphane Aulery <saulery <at> free.fr>
Subject: doc: Adds a bug section to sync.1 page to draw attention to
 unexpected behavior allowed by POSIX.
Date: Wed,  4 Mar 2015 01:06:01 +0100

From: Stéphane Aulery <saulery <at> free.fr>

Almost identical copy of sync.2.

Debian bug #507085 reported by jidanni <at> jidanni.org

Signed-off-by: Stéphane Aulery <saulery <at> free.fr>
---
 man/sync.x | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/man/sync.x b/man/sync.x
index 79fee22..5b85bba 100644
--- a/man/sync.x
+++ b/man/sync.x
@@ -2,5 +2,10 @@
 sync \- Synchronize cached writes to persistent storage
 [DESCRIPTION]
 .\" Add any additional description here
+[BUGS]
+According to the standard specification (e.g., POSIX.1-2001), sync()
+syscall schedules the writes, but may return before the actual writing is
+done. However, since version 1.3.20 Linux does actually wait. (This still
+does not guarantee data integrity: modern disks have large caches.)
 [SEE ALSO]
 fdatasync(2), fsync(2), sync(2), syncfs(2)
-- 
2.1.4

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