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flock.2: Move NOTES text describing implementation of flock() 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2014-04-27 10:09:50 +02:00
parent e449654fdb
commit b1b70920af
1 changed files with 15 additions and 15 deletions
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man2/flock.2
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@ -146,6 +146,21 @@ possibly implemented in terms of
.BR fcntl (2),
appears on most UNIX systems.
.SH NOTES
Since kernel 2.0,
.BR flock ()
is implemented as a system call in its own right rather
than being emulated in the GNU C library as a call to
.BR fcntl (2).
This yields true BSD semantics:
there is no interaction between the types of lock
placed by
.BR flock ()
and
.BR fcntl (2),
and
.BR flock ()
does not detect deadlock.
.PP
In Linux kernels up to 2.6.11,
.BR flock ()
does not lock files over NFS
@ -177,21 +192,6 @@ see the discussion of the
option in
.BR nfs (5).
.PP
Since kernel 2.0,
.BR flock ()
is implemented as a system call in its own right rather
than being emulated in the GNU C library as a call to
.BR fcntl (2).
This yields true BSD semantics:
there is no interaction between the types of lock
placed by
.BR flock ()
and
.BR fcntl (2),
and
.BR flock ()
does not detect deadlock.
.PP
.BR flock ()
places advisory locks only; given suitable permissions on a file,
a process is free to ignore the use of